FEATURES FUNCTIONAL BLOCK DIAGRAM APPLICATIONS ACSHIELD VCC 8 GND BIAS 10 9 11 POWER-ON RESET LOGIC CIN0 19 CIN1 20 CIN2 21 EXCITATION SOURCE CIN3 22 CIN4 23 CIN5 24 CIN6 1 CIN7 2 CIN8 3 CIN9 CALIBRATION RAM AD7147/ AD7147-1 16-BIT Σ-∆ CDC 4 CALIBRATION ENGINE CIN10 5 CIN11 6 CONTROL AND DATA REGISTERS CIN12 7 VDRIVE 12 INTERRUPT AND GPIO LOGIC SERIAL INTERFACE AND CONTROL LOGIC 13 14 15 16 18 GPIO 17 SDO/ SDI/ SCLK CS/ SDA ADD0 ADD1 INT 06663-001 Programmable capacitance-to-digital converter (CDC) Femtofarad resolution 13 capacitance sensor inputs 9 ms update rate, all 13 sensor inputs No external RC components required Automatic conversion sequencer On-chip automatic calibration logic Automatic compensation for environmental changes Automatic adaptive threshold and sensitivity levels Register map is compatible with the AD7142 On-chip RAM to store calibration data SPI-compatible (serial-peripheral-interface-compatible) serial interface (AD7147) I2C-compatible serial interface (AD7147-1) Separate VDRIVE level for serial interface Interrupt output and general-purpose input/output (GPIO) 24-lead, 4 mm × 4 mm LFCSP 2.6 V to 3.3 V supply voltage Low operating current Full power mode: 1 mA Low power mode: 21.5 μA Qualified for automotive applications SWITCH MATRIX Data Sheet CapTouch Programmable Controller for Single-Electrode Capacitance Sensors AD7147 Figure 1. Cell phones Personal music and multimedia players Smart handheld devices Television, A/V, and remote controls Gaming consoles Digital still cameras The AD7147 is designed for single electrode capacitance sensors (grounded sensors). There is an active shield output to minimize noise pickup in the sensor. GENERAL DESCRIPTION The AD7147 CapTouch™ controller is designed for use with capacitance sensors implementing functions such as buttons, scroll bars, and wheels. The sensors need only one PCB layer, enabling ultrathin applications. The AD7147 is an integrated CDC with on-chip environmental calibration. The CDC has 13 inputs channeled through a switch matrix to a 16-bit, 250 kHz sigma-delta (∑-Δ) converter. The CDC is capable of sensing changes in the capacitance of the external sensors and uses this information to register a sensor activation. By programming the registers, the user has full control over the CDC setup. The AD7147 has on-chip calibration logic to compensate for changes in the ambient environment. The calibration sequence is performed automatically and at continuous intervals as long as the sensors are not touched. This ensures that there are no false or nonregistering touches on the external sensors due to a changing environment. The AD7147 has an SPI-compatible serial interface, and the AD7147-1 has an I2C®-compatible serial interface. Both parts have an interrupt output, as well as a GPIO. There is a VDRIVE pin to set the voltage level for the serial interface independent of VCC. The AD7147 is available in a 24-lead, 4 mm × 4 mm LFCSP and operates from a 2.6 V to 3.6 V supply. The operating current consumption in low power mode is typically 26 μA for 13 sensors. High resolution sensors require minor software to run on the host processor. Rev. E Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2007–2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com AD7147* PRODUCT PAGE QUICK LINKS Last Content Update: 02/23/2017 COMPARABLE PARTS REFERENCE MATERIALS View a parametric search of comparable parts. Technical Articles • MS-2210: Designing Power Supplies for High Speed ADC EVALUATION KITS • EVAL-AD7147 & EVAL-AD7147-1 Evaluation Boards DESIGN RESOURCES • AD7147 Material Declaration DOCUMENTATION • PCN-PDN Information Application Notes • Quality And Reliability • AN-925: Sensors for the AD7147 and AD7148 CapTouch® Controllers • Symbols and Footprints • AN-929: Tuning the AD714x for CapTouch® Applications DISCUSSIONS • AN-957: Layout Guidelines for the AD7147 and AD7148 CapTouch® Controllers View all AD7147 EngineerZone Discussions. Data Sheet SAMPLE AND BUY • AD7147: CapTouch Programmable Controller for SingleElectrode Capacitance Sensors Data Sheet Visit the product page to see pricing options. Product Highlight • Leading Inside Advertorials: Providing an Edge in Capacitive Sensor Applications SOFTWARE AND SYSTEMS REQUIREMENTS • AD714X Input CapTouch® Programmable Controller Linux Driver TECHNICAL SUPPORT Submit a technical question or find your regional support number. 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AD7147 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Capacitance Sensor Behavior Without Calibration ............... 24 Applications ....................................................................................... 1 Threshold Equations .................................................................. 25 General Description ......................................................................... 1 Capacitance Sensor Behavior with Calibration ...................... 25 Functional Block Diagram .............................................................. 1 Slow FIFO .................................................................................... 25 Revision History ............................................................................... 3 SLOW_FILTER_UPDATE_LVL .............................................. 26 Specifications..................................................................................... 4 Adaptive Threshold and Sensitivity ............................................. 27 Average Current Specifications .................................................. 5 Interrupt Output ............................................................................. 29 SPI Timing Specifications (AD7147) ......................................... 6 CDC Conversion-Complete Interrupt .................................... 29 I C Timing Specifications (AD7147-1) ...................................... 7 Sensor-Touch Interrupt ............................................................. 29 Absolute Maximum Ratings ............................................................ 8 GPIO INT Output Control ....................................................... 31 ESD Caution .................................................................................. 8 Outputs ............................................................................................ 33 Pin Configurations and Function Descriptions ........................... 9 ACSHIELD Output .......................................................................... 33 Typical Performance Characteristics ........................................... 10 General-Purpose Input/Output (GPIO) ................................. 33 Theory of Operation ...................................................................... 12 Using the GPIO to Turn On/Off an LED ................................ 33 Capacitance Sensing Theory ..................................................... 12 Serial Interface ................................................................................ 34 BIAS Pin ....................................................................................... 13 SPI Interface ................................................................................ 34 Operating Modes ........................................................................ 13 I2C-Compatible Interface .......................................................... 36 Capacitiance-to-Digital Converter............................................... 15 VDRIVE Input ................................................................................. 38 Oversampling the CDC Output ............................................... 15 PCB Design Guidelines ................................................................. 39 Capacitance Sensor Offset Control .......................................... 15 Capacitive Sensor Board Mechanical Specifications ............. 39 Conversion Sequencer ............................................................... 15 Chip Scale Packages ................................................................... 39 CDC Conversion Sequence Time ............................................ 17 Power-Up Sequence ....................................................................... 40 CDC Conversion Results ........................................................... 17 Typical Application Circuits ......................................................... 41 Capacitance Sensor Input Configuration .................................... 18 Register Map ................................................................................... 42 CINx Input Multiplexer Setup .................................................. 18 Detailed Register Descriptions ..................................................... 43 Single-Ended Connections to the CDC .................................. 18 Bank 1 Registers ......................................................................... 43 Noncontact Proximity Detection ................................................. 19 Bank 2 Registers ......................................................................... 53 Recalibration ............................................................................... 19 Bank 3 Registers ......................................................................... 58 Proximity Sensitivity .................................................................. 19 Outline Dimensions ....................................................................... 70 FF_SKIP_CNT ............................................................................ 22 Ordering Guide .......................................................................... 70 Environmental Calibration ........................................................... 24 Automotive Products ................................................................. 70 2 Rev. E | Page 2 of 70 Data Sheet AD7147 REVISION HISTORY 1/15—Rev. D to Rev. E Updated Outline Dimensions ........................................................70 Changes to Ordering Guide ...........................................................70 7/09—Rev. A to Rev. B Changes to BIAS Pin Description ................................................... 8 Changes to BIAS Pin Section ......................................................... 12 9/11—Rev. C to Rev. D Changes to Ordering Guide ...........................................................70 8/08—Rev. 0 to Rev. A Changes to Table 3 ............................................................................ 4 Added Figure 3, Renumbered Sequentially ................................... 6 Changes to Low Power Mode Section .......................................... 13 Added Latency from Touch to Response Section ....................... 13 Added Low Latency from Touch to Response Section .............. 13 Changes to Figure 60 and Figure 61 ............................................. 40 Changes to Figure 62 ...................................................................... 41 Added Exposed Pad Notation to Outline Dimensions .............. 68 5/11—Rev. B to Rev. C Changes to Features Section ............................................................ 1 Changes to Ordering Guide ...........................................................70 Added Automotive Products Section ...........................................70 9/07—Revision 0: Initial Version Rev. E | Page 3 of 70 AD7147 Data Sheet SPECIFICATIONS VCC = 2.6 V to 3.6 V, TA = −40oC to +85°C, unless otherwise noted. Table 1. Parameter CAPACITANCE-TO-DIGITAL CONVERTER Update Rate Resolution CINx Input Range No Missing Codes Min Typ Max Unit Test Conditions/Comments 8.73 17.46 34.9 9 18 36 16 ±8 9.27 18.54 37.1 ms ms ms Bits pF Bits 12 conversion stages, decimation = 64 12 conversion stages, decimation = 128 12 conversion stages, decimation = 256 16 CINx Input Leakage Maximum Output Load Total Unadjusted Error Output Noise (Peak-to-Peak) 25 20 ±20 12 7 3 1.1 0.8 0.5 20 0.32 Output Noise (RMS) CSTRAY Offset Range CSTRAY Offset Resolution Low Power Mode Delay Accuracy ACSHIELD Frequency Output Voltage Short-Circuit Source Current Short-Circuit Sink Current Maximum Output Load LOGIC INPUTS (SDI, SCLK, CS, SDA, GPIO) VIH Input High Voltage VIL Input Low Voltage IIH Input High Current IIL Input Low Current Hysteresis OPEN-DRAIN OUTPUTS (SCLK, SDA, INT) VOL Output Low Voltage IOH Output High Leakage Current LOGIC OUTPUTS (SDO, GPIO) VOL Output Low Voltage VOH Output High Voltage GPIO, SDO Floating State Leakage Current POWER VCC VDRIVE ICC 4 250 0 VCC 10 10 150 0.7 × VDRIVE 0.4 −1 1 150 kHz V mA mA pF V V µA µA mV Capacitance load on CINx to ground Decimation rate = 64 Decimation rate = 128 Decimation rate = 256 Decimation rate = 64 Decimation rate = 128 Decimation rate = 256 Percentage of 200 ms, 400 ms, 600 ms, or 800 ms Oscillating Capacitance load on ACSHIELD to ground VIN = VDRIVE VIN = GND 0.4 ±1 V µA ISINK = −1 mA VOUT = VDRIVE 0.4 ±1 V V µA ISINK = 1 mA, VDRIVE = 1.65 V to 3.6 V ISOURCE = 1 mA, VDRIVE = 1.65 V to 3.6 V Pin three-state, leakage measured to GND and VCC 0.9 15.5 3.6 3.6 1 21.5 V V mA µA 2.3 7.5 µA ±0.1 VDRIVE − 0.6 2.6 1.65 nA pF % Codes Codes Codes Codes Codes Codes pF pF % Guaranteed by design, but not production tested 3.3 Rev. E | Page 4 of 70 Serial interface operating voltage In full power mode, VCC + VDRIVE Low power mode, converter idle, VCC + VDRIVE, decimation = 256 Full shutdown, VCC + VDRIVE Data Sheet AD7147 AVERAGE CURRENT SPECIFICATIONS Table 2. Typical Average Current in Low Power Mode1 Low Power Mode Delay 200 ms 400 ms 600 ms 800 ms 1 Decimation Rate 64 128 256 64 128 256 64 128 256 64 128 256 1 20.83 25.3 34.11 18.17 20.43 24.9 17.28 18.79 21.79 16.84 17.97 20.23 2 24.18 31.92 46.99 19.86 23.79 31.53 18.41 21.04 26.25 17.69 19.66 23.59 3 27.52 38.45 59.51 21.55 27.12 38.06 19.54 23.28 30.67 18.53 21.35 26.93 Current Values of Conversion Stages (μA) 5 6 7 8 9 34.11 37.37 40.6 43.81 46.99 51.21 57.45 63.6 69.66 75.63 83.47 94.94 106.1 116.96 127.52 24.9 26.57 28.23 29.88 31.53 33.72 36.98 40.22 43.43 46.62 50.83 57.08 63.23 69.3 75.28 21.79 22.91 24.03 25.14 26.25 27.73 29.94 32.13 34.32 36.49 39.37 43.66 47.9 52.11 56.27 20.23 21.07 21.91 22.75 23.59 24.7 26.37 28.03 29.69 31.34 33.53 36.79 40.03 43.24 46.43 10 50.16 81.52 137.81 33.17 49.78 81.17 27.36 38.65 60.39 24.43 32.98 49.6 11 53.3 87.33 147.82 34.81 52.93 86.98 28.47 40.81 64.47 25.26 34.62 52.74 12 56.41 93.05 157.58 36.44 56.05 92.71 29.57 42.95 68.51 26.09 36.25 55.86 Current Values of Conversion Stages (μA) 5 6 7 8 9 44.16 48.12 52.06 55.97 59.85 64.97 72.55 80.02 87.37 94.61 104.09 117.97 131.45 144.53 157.25 32.95 34.99 37.01 39.03 41.04 43.71 47.68 51.62 55.53 59.41 64.54 72.12 79.6 86.96 94.2 29.17 30.53 31.89 33.25 34.61 36.41 39.1 41.78 44.44 47.09 50.6 55.82 60.98 66.09 71.15 27.26 28.29 29.32 30.34 31.36 32.72 34.76 36.79 38.8 40.81 43.48 47.46 51.4 55.31 59.19 10 63.69 101.74 169.61 43.04 63.26 101.34 35.96 49.72 76.15 32.38 42.81 63.04 11 67.51 108.77 181.63 45.03 67.08 108.37 37.31 52.34 81.1 33.4 44.81 66.86 12 71.29 115.69 193.33 47.02 70.87 115.3 38.66 54.95 86.01 34.42 46.79 70.66 4 30.82 44.87 71.66 23.23 30.43 44.5 20.67 25.51 35.04 19.38 23.03 30.24 VCC = 3.3 V, TA = 25°C, load = 50 pF. Table 3. Maximum Average Current in Low Power Mode1 Low Power Mode Delay 200 ms 400 ms 600 ms 800 ms 1 Decimation Rate 64 128 256 64 128 256 64 128 256 64 128 256 1 27.96 33.41 44.16 24.74 27.49 32.95 23.66 25.5 29.17 23.12 24.5 27.26 2 32.06 41.49 59.85 26.8 31.59 41.04 25.04 28.25 34.61 24.16 26.57 31.36 3 36.12 49.44 75.05 28.86 35.66 49 26.42 30.99 40 25.19 28.63 35.44 4 40.15 57.26 89.79 30.91 39.7 56.83 27.79 33.71 45.33 26.23 30.68 39.47 VCC = 3.6 V, TA = −40°C to +85°C, load = 50 pF. Rev. E | Page 5 of 70 AD7147 Data Sheet SPI TIMING SPECIFICATIONS (AD7147) TA = −40°C to +85°C, sample tested at 25°C to ensure compliance. VDRIVE = 1.65 V to 3.6 V, and VCC = 2.6 V to 3.6 V, unless otherwise noted. All input signals are specified with tR = tF = 5 ns (10% to 90% of VCC) and timed from a voltage level of 1.6 V. Table 4. SPI Timing Specifications Parameter fSCLK t1 t2 t3 t4 t5 t6 t7 t8 Limit 5 5 20 20 15 15 20 16 15 Unit MHz max ns min ns min ns min ns min ns min ns max ns max ns min Description SCLK frequency CS falling edge to first SCLK falling edge SCLK high pulse width SCLK low pulse width SDI setup time SDI hold time SDO access time after SCLK falling edge CS rising edge to SDO high impedance SCLK rising edge to CS high SPI Timing Diagram CS t1 t2 1 SCLK t8 t3 2 3 15 16 1 2 15 16 t4 t5 LSB t6 SDO MSB Figure 2. SPI Detailed Timing Diagram Rev. E | Page 6 of 70 t7 LSB 06663-002 SDI MSB Data Sheet AD7147 I2C TIMING SPECIFICATIONS (AD7147-1) TA = −40°C to +85°C, sample tested at 25°C to ensure compliance. VDRIVE = 1.65 V to 3.6 V, and VCC = 2.6 V to 3.6 V, unless otherwise noted. All input signals timed from a voltage level of 1.6 V. Table 5. I2C Timing Specifications1 Parameter fSCLK t1 t2 t3 t4 t5 t6 t7 t8 tR tF 1 Limit 400 0.6 1.3 0.6 100 300 0.6 0.6 1.3 300 300 Unit kHz max μs min μs min μs min ns min ns min μs min μs min μs min ns max ns max Description Start condition hold time, tHD; STA Clock low period, tLOW Clock high period, tHIGH Data setup time, tSU; DAT Data hold time, tHD; DAT Stop condition setup time, tSU; STO Start condition setup time, tSU; STA Bus-free time between stop and start conditions, tBUF Clock/data rise time Clock/data fall time Guaranteed by design, not production tested. I2C Timing Diagram tR t2 tF t1 SCLK t3 t1 t5 t7 t6 t4 SDA STOP START START STOP Figure 3. I2C Detailed Timing Diagram 200µA 1.6V CL 50pF 200µA IOH 06663-004 TO OUTPUT PIN IOL Figure 4. Load Circuit for Digital Output Timing Specifications Rev. E | Page 7 of 70 06663-003 t8 AD7147 Data Sheet ABSOLUTE MAXIMUM RATINGS Table 6. Parameter VCC to GND Analog Input Voltage to GND Digital Input Voltage to GND Digital Output Voltage to GND Input Current to Any Pin Except Supplies1 ESD Rating (Human Body Model) Operating Temperature Range Storage Temperature Range Junction Temperature LFCSP Power Dissipation θJA Thermal Impedance IR Reflow Peak Temperature Lead Temperature (Soldering 10 sec) 1 Rating −0.3 V to +3.6 V −0.3 V to VCC + 0.3 V −0.3 V to VDRIVE + 0.3 V −0.3 V to VDRIVE + 0.3 V 10 mA 2.5 kV −40°C to +105°C −65°C to +150°C 150°C Stresses at or above those listed under Absolute Maximum Ratings may cause permanent damage to the product. This is a stress rating only; functional operation of the product at these or any other conditions above those indicated in the operational section of this specification is not implied. Operation beyond the maximum operating conditions for extended periods may affect product reliability. ESD CAUTION 450 mW 135.7°C/W 260°C (±0.5°C) 300°C Transient currents of up to 100 mA do not cause SCR latch-up. Rev. E | Page 8 of 70 Data Sheet AD7147 PIN 1 INDICATOR AD7147 TOP VIEW (Not to Scale) 18 17 16 15 14 13 GPIO INT CS SCLK SDI SDO CIN6 CIN7 CIN8 CIN9 CIN10 CIN11 PIN 1 INDICATOR AD7147-1 18 17 16 15 14 13 GPIO INT ADD1 SCLK ADD0 SDA 7 8 9 10 11 12 TOP VIEW (Not to Scale) CIN12 ACSHIELD BIAS GND VCC VDRIVE 06663-005 CIN12 ACSHIELD BIAS GND VCC VDRIVE 1 2 3 4 5 6 06663-006 1 2 3 4 5 6 7 8 9 10 11 12 CIN6 CIN7 CIN8 CIN9 CIN10 CIN11 24 23 22 21 20 19 24 23 22 21 20 19 CIN5 CIN4 CIN3 CIN2 CIN1 CIN0 CIN5 CIN4 CIN3 CIN2 CIN1 CIN0 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS NOTES 1. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS AND MAXIMUM THERMAL CAPABILITY IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE GROUND PLANE. NOTES 1. THE EXPOSED PAD IS NOT CONNECTED INTERNALLY. FOR INCREASED RELIABILITY OF THE SOLDER JOINTS AND MAXIMUM THERMAL CAPABILITY IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE GROUND PLANE. Figure 5. AD7147 Pin Configuration Figure 6. AD7147-1 Pin Configuration Table 7. Pin Function Descriptions AD7147 1 2 3 4 5 6 7 8 9 10 11 12 13 N/A 14 N/A 15 16 N/A 17 18 19 20 21 22 23 24 Pin No. AD7147-1 1 2 3 4 5 6 7 8 9 10 11 12 N/A 13 N/A 14 15 N/A 16 17 18 19 20 21 22 23 24 Mnemonic CIN6 CIN7 CIN8 CIN9 CIN10 CIN11 CIN12 ACSHIELD BIAS GND VCC VDRIVE SDO SDA SDI ADD0 SCLK CS ADD1 INT GPIO CIN0 CIN1 CIN2 CIN3 CIN4 CIN5 Description Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. CDC Active Shield Output. Connect to external shield or plane. Bias Node for Internal Circuitry. Requires 100 nF capacitor to ground. Ground Reference Point for All Circuitry. Supply Voltage. Serial Interface Operating Voltage Supply. SPI Serial Data Output. I2C Serial Data Input/Output. SDA requires pull-up resistor. SPI Serial Data Input. I2C Address Bit 0. Clock Input for Serial Interface. SPI Chip Select Signal. I2C Address Bit 1. General-Purpose Open-Drain Interrupt Output. Programmable polarity; requires pull-up resistor. Programmable GPIO. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Capacitance Sensor Input. Rev. E | Page 9 of 70 AD7147 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 935 70 915 60 895 200ms 50 875 ICC (μA) ICC (µA) DECIMATION = 64 DECIMATION = 128 DECIMATION = 256 855 40 400ms 600ms 30 815 10 795 2.6 06663-007 20 2.7 2.8 2.9 3.0 3.1 3.2 3.3 3.4 3.5 3.6 06663-060 800ms 835 0 2.5 3.7 3.3 3.1 2.9 2.7 VCC (V) 3.5 3.7 VCC (V) Figure 7. Supply Current vs. Supply Voltage Figure 10. Low Power Supply Current vs. Supply Voltage, Decimation Rate = 64 180 2.5 200ms 160 2.0 140 100 ICC (µA) ICC (μA) 120 400ms 80 600ms 1.5 1.0 60 800ms 40 0 2.5 2.7 2.9 3.1 3.3 3.5 0 2.7 3.7 06663-010 06663-061 0.5 20 2.8 2.9 3.0 VCC (V) 3.1 3.2 3.3 3.4 3.5 3.6 VCC (V) Figure 8. Low Power Supply Current vs. Supply Voltage, Decimation Rate = 256 Figure 11. Shutdown Supply Current vs. Supply Voltage 0.12 1150 0.10 200ms 1100 ICC (µA) 0.06 400ms 600ms 1050 1000 0.04 800ms 0 2.5 2.7 2.9 3.1 3.3 3.5 3.7 06663-062 950 0.02 06663-009 ICC (mA) 0.08 900 0 VCC (V) 100 200 300 400 500 ACSHIELD CAPACITIVE LOAD (pF) Figure 9. Low Power Supply Current vs. Supply Voltage, Decimation Rate = 128 Figure 12. Supply Current vs. Capacitive Load on ACSHIELD Rev. E | Page 10 of 70 Data Sheet AD7147 160 58000 56000 140 54000 75mV 100mV 125mV 150mV 175mV 200mV CDC NOISE p-p (LSB) 120 52000 50000 48000 46000 100 80 60 40 44000 SINE WAVE FREQUENCY (Hz) Figure 13. Output Code vs. Capacitive Load on ACSHIELD 1640000 409600 819200 102400 204800 25600 51200 6400 12800 ACSHIELD CAPACITIVE LOAD (pF) 1600 0 500 3200 400 400 300 800 200 200 100 25 0 50 40000 06663-064 20 06663-063 42000 100 CDC CODE (d) 25mV 50mV Figure 16. Power Supply Sine Wave Rejection, VCC = 3.6 V 960 120 25mV 50mV 940 3.6V 75mV 100mV 125mV 150mV 175mV 200mV 100 CDC NOISE p-p (LSB) 920 900 ICC (µA) 3.3V 880 860 840 820 80 60 40 2.6V SQUARE WAVE FREQUENCY (Hz) Figure 14. Supply Current vs. Temperature Figure 17. Power Supply Square Wave Rejection, VCC = 3.6 V 35 10 30 INPUT CAPACITANCE (pF) 12 6 3.6V 3.3V 2.6V 2 –25 –5 15 35 55 75 95 115 20 15 10 06663-016 0 –45 25 5 06663-014 ICC (µA) 8 4 1640000 819200 409600 204800 102400 51200 25600 TEMPERATURE (°C) 6400 0 120 12800 100 3200 80 1600 60 800 40 400 20 200 0 100 –20 50 –40 25 780 –60 06663-065 06663-013 20 800 0 135 0 TEMPERATURE (°C) 10000 20000 30000 40000 50000 CDC OUTPUT CODE Figure 15. Shutdown Supply Current vs. Temperature Figure 18. CDC Linearity, VCC = 3.3 V Rev. E | Page 11 of 70 60000 AD7147 Data Sheet THEORY OF OPERATION The AD7147 interfaces with up to 13 external capacitance sensors. These sensors can be arranged as buttons, scroll bars, or wheels, or as a combination of sensor types. The external sensors consist of an electrode on a single- or multiple-layer PCB that interfaces directly to the AD7147. require low power operation to provide the user with significant power savings and full functionality. The AD7147 has an interrupt output, INT, to indicate when new data has been placed into the registers. INT is used to interrupt the host on sensor activation. The AD7147 operates from a 2.6 V to 3.6 V supply and is available in a 24-lead, 4 mm × 4 mm LFCSP. CAPACITANCE SENSING THEORY The AD7147 measures capacitance changes from single electrode sensors. The sensor electrode on the PCB comprises one plate of a virtual capacitor. The other plate of the capacitor is the user’s finger, which is grounded with respect to the sensor input. The AD7147 first outputs an excitation signal to charge the plate of the capacitor. When the user comes close to the sensor, the virtual capacitor is formed, with the user acting as the second capacitor plate. The AD7147 can be set up to implement any set of input sensors by programming the on-chip registers. The registers can also be programmed to control features such as averaging, offsets, and gains for each of the external sensors. There is an on-chip sequencer that controls how each of the capacitance inputs is polled. PLASTIC COVER SENSOR PCB The AD7147 requires a companion algorithm that runs on the host or another microcontroller to implement high resolution sensor functions, such as scroll bars or wheels. However, no companion algorithm is required to implement buttons. Button sensors are implemented on chip, entirely in digital logic. The AD7147 can be programmed to operate in either full power mode or low power automatic wake-up mode. The automatic wake-up mode is particularly suited for portable devices that MUX The AD7147 has on-chip digital logic and 528 words of RAM that are used for environmental compensation. The effects of humidity, temperature, and other environmental factors can affect the operation of capacitance sensors. Transparent to the user, the AD7147 performs continuous calibration to compensate for these effects, allowing the AD7147 to consistently provide error-free results. AD7147 Σ-Δ ADC 16-BIT DATA EXCITATION SIGNAL 250kHz 06663-017 The AD7147 and AD7147-1 are CDCs with on-chip environmental compensation. They are intended for use in portable systems requiring high resolution user input. The internal circuitry consists of a 16-bit, ∑-∆ converter that can change a capacitive input signal into a digital value. There are 13 input pins, CIN0 to CIN12, on the AD7147 or AD7147-1. A switch matrix routes the input signals to the CDC. The result of each capacitance-to-digital conversion is stored in on-chip registers. The host subsequently reads the results over the serial interface. The AD7147 has an SPI interface, and the AD7147-1 has an I2C interface, ensuring that the parts are compatible with a wide range of host processors. AD7147 refers to both the AD7147 and AD7147-1, unless otherwise noted, from this point forward in this data sheet. Figure 19. Capacitance-Sensing Method A square wave excitation signal is applied to CINx during the conversion, and the modulator continuously samples the charge going through CINx. The output of the modulator is processed via a digital filter, and the resulting digital data is stored in the CDC_RESULT_Sx registers for each conversion stage, at Address 0x00B to Address 0x016. Rev. E | Page 12 of 70 Data Sheet AD7147 Registering a Sensor Activation Complete Solution for Capacitance Sensing When a user approaches a sensor, the total capacitance associated with that sensor changes and is measured by the AD7147. If the change causes a set threshold to be exceeded, the AD7147 interprets this as a sensor activation. Analog Devices, Inc., provides a complete solution for capacitance sensing. The two main elements to the solution are the sensor PCB and the AD7147. If the application requires high resolution sensors such as scroll bars or wheels, software is required that runs on the host processor. The memory requirements for the host depend on the sensor and are typically 10 kB of code and 600 bytes of data memory, depending on the sensor type. SENSOR PCB AD7147 STAGEx_HIGH_THRESHOLD SPI OR I2C HOST PROCESSOR 1 MIPS 10kB ROM 600 BYTES RAM CDC_RESULT_Sx AMBIENT OR NO-TOUCH VALUE Figure 21. Three-Part Capacitance Sensing Solution STAGEx_LOW_THRESHOLD 06663-018 CDC OUTPUT CODES SENSOR ACTIVE (A) 06663-019 On-chip threshold limits are used to determine when a sensor activation occurs. Figure 20 shows the change in CDC_RESULT_Sx when a user activates a sensor. The sensor is deemed to be active only when the value of CDC_RESULT_Sx is either greater than the value of STAGEx_HIGH_THRESHOLD or less than the value of STAGEx_LOW_THRESHOLD. SENSOR ACTIVE (B) Analog Devices supplies the sensor PCB footprint design libraries to the customer and supplies any necessary software on an open source basis. BIAS PIN Figure 20. Sensor Activation Thresholds In Figure 20, two sensor activations are shown. Sensor Active A occurs when a sensor is connected to the positive input of the converter. In this case, when a user activates the sensor, there is an increase in CDC code, and the value of CDC_RESULT_Sx exceeds that of STAGEx_HIGH_THRESHOLD. Sensor Active B occurs when the sensor is connected to the negative input of the converter. In this case, when a user activates the sensor, there is a decrease in CDC code, and the value of CDC_RESULT_Sx becomes less than the value of STAGEx_LOW_THRESHOLD. For each conversion stage, the STAGEx_HIGH_THRESHOLD and STAGEx_LOW_THRESHOLD registers are in Register Bank 3. The values in these registers are updated automatically by the AD7147 due to its environmental calibration and adaptive threshold logic. At power-up, the values in the STAGEx_HIGH_THRESHOLD and STAGEx_LOW_THRESHOLD registers are the same as those in the STAGEx_OFFSET_HIGH and STAGEx_OFFSET_LOW registers in Bank 2. The user must program the STAGEx_OFFSET _HIGH and STAGEx_OFFSET_LOW registers on device powerup. See the Environmental Calibration section of the data sheet for more information. This pin is connected internally to a bias node of the AD7147. To ensure correct operation of the AD7147, connect a 100 nF capacitor between the BIAS pin and ground. The voltage seen at the BIAS pin is VCC/2. OPERATING MODES The AD7147 has three operating modes. Full power mode, where the device is always fully powered, is suited for applications where power is not a concern (for example, game consoles that have an ac power supply). Low power mode, where the part automatically powers down when no sensor is active, is tailored to provide significant power savings compared with full power mode and is suited for mobile applications, where power must be conserved. In shutdown mode, the part shuts down completely. The POWER_MODE bits (Bit 0 and Bit 1) of the control register set the operating mode on the AD7147. The control register is at Address 0x000. Table 8 shows the POWER_MODE settings for each operating mode. To put the AD7147 into shutdown mode, set the POWER_MODE bits to either 01 or 11. Table 8. POWER_MODE Settings POWER_MODE Bits 00 01 10 11 Operating Mode Full power mode Shutdown mode Low power mode Shutdown mode The power-on default setting of the POWER_MODE bits is 00, full power mode. Rev. E | Page 13 of 70 AD7147 Data Sheet Full Power Mode In full power mode, all sections of the AD7147 remain fully powered and converting at all times. While a sensor is being touched, the AD7147 processes the sensor data. If no sensor is touched, the AD7147 measures the ambient capacitance level and uses this data for the on-chip compensation routines. In full power mode, the AD7147 converts at a constant rate. See the CDC Conversion Sequence Time section for more information. Low Power Mode When AD7147 is in low power mode, the POWER_MODE bits are set to 10 upon device initialization. If the external sensors are not touched, the AD7147 reduces its conversion frequency, thereby greatly reducing its power consumption. The part remains in a reduced power state while the sensors are not touched. The AD7147 performs a conversion after a delay defined by the LP_CONV_DELAY bits, and it uses this data to update the compensation logic and check if the sensors are active. The LP_CONV_DELAY bits set the delay between conversions to 200 ms, 400 ms, 600 ms, or 800 ms. In low power mode, the total current consumption of the AD7147 is an average of the current used during a conversion and the current used while the AD7147 is waiting for the next conversion to begin. For example, when LP_CONV_DELAY is 400 ms, the AD7147 typically uses 0.85 mA of current for 36 ms and 14 μA of current for 400 ms during the conversion interval. (Note that these conversion timings can be altered through the register settings. See the CDC Conversion Sequence Time section for more information.) The time for the AD7147 to transition from a full power state to a reduced power state after the user stops touching the external sensors is configurable. The PWR_DOWN_TIMEOUT bits (in the Ambient Compensation Control 0 (AMB_COMP_CTRL0) Register at Address 0x002) control the time delay before the AD7147 transitions to the reduced power state after the user stops touching the sensors. Latency from Touch to Response In low power mode, the AD7147 remains in a low power state until any one of the external sensors are touched. When a sensor is touched, the AD7147 begins a conversion sequence every 36 ms to read back data from the sensors. This means that the latency between the user touching the sensor, and the AD7147 responding, is a maximum of LP_CONV_DELAY ms. Low Latency from Touch to Response In low power mode, the AD7147P model remains in a low power state until proximity is detected on any one of the external sensors. When proximity is detected, the AD714P begins a conversion sequence every 36 ms, or 18 ms, or 9 ms to read back data from the sensors. The latency between first touch and the AD7147P responding is much reduced, compared to the AD7147, because the part is already in a full power state by the time the user has touched the sensor. AD7147P SETUP AND INITIALIZATION POWER_MODE = 10 AD7147 SETUP AND INITIALIZATION POWER_MODE = 10 ANY SENSOR TOUCHED? CONVERSION SEQUENCE EVERY LP_CONV_DELAY UPDATE COMPENSATION LOGIC DATA PATH NO YES CONVERSION SEQUENCE EVERY 9/18/36ms FOR SENSOR READBACK YES USER IN PROXIMITY TO SENSOR? CONVERSION SEQUENCE EVERY LP_CONV_DELAY UPDATE COMPENSATION LOGIC DATA PATH YES CONVERSION SEQUENCE EVERY 9/18/36ms FOR SENSOR READBACK YES ANY SENSOR TOUCHED? NO 06663-020 NO PROXIMITY TIMER TIMEOUT COUNTDOWN USER IN PROXIMITY TO SENSOR? PROXIMITY TIMER TIMEOUT COUNTDOWN Figure 23. Low Power Mode Operation, AD7147P Figure 22. Low Power Mode Operation, AD7147 Rev. E | Page 14 of 70 06663-066 NO Data Sheet AD7147 CAPACITIANCE-TO-DIGITAL CONVERTER from midscale, decrease the POS_AFE_OFFSET or NEG_AFE_OFFSET value by 1. The capacitance-to-digital converter on the AD7147 has a Σ-Δ architecture with 16-bit resolution. There are 13 possible inputs to the CDC that are connected to the input of the converter through a switch matrix. The sampling frequency of the CDC is 250 kHz. The goal is to ensure that the CDC_RESULT_Sx is as close to midscale as possible. This process is only required once during the initial capacitance sensor characterization. OVERSAMPLING THE CDC OUTPUT The decimation rate, or oversampling ratio, is determined by Bits[9:8] of the power control (PWR_CONTROL) register (Address 0x000), as listed in Table 9. +DAC (20pF RANGE) Table 9. CDC Decimation Rate Decimation Rate 256 128 64 64 The decimation process on the AD7147 is an averaging process, where a number of samples are taken and the averaged result is output. Due to the architecture of the digital filter employed, the number of samples taken (per stage) is equal to 3× the decimation rate. So 3 × 256 or 3 × 128 samples are averaged to obtain each stage result. The decimation process reduces the amount of noise present in the final CDC result. However, the higher the decimation rate, the lower the output rate per stage; therefore, there is a trade-off possible between the amount of noise in the signal and the speed of sampling. CAPACITANCE SENSOR OFFSET CONTROL There are two programmable DACs on board the AD7147 to null the effect of any stray capacitances on the CDC measurement. These offsets are due to stray capacitance to ground. A simplified block diagram in Figure 24 shows how to apply the STAGEx_AFE_OFFSET registers to null the offsets. The 6-bit POS_AFE_OFFSET and NEG_AFE_OFFSET bits program the offset DAC to provide 0.32 pF resolution offset adjustment over a range of 20 pF. The best practice is to ensure that the CDC output for any stage is approximately equal to midscale (~32,700) when all sensors are inactive. To correctly offset the stray capacitance to ground for each stage, use the following procedure: 1. Read back the CDC value from the CDC_RESULT_Sx register. 2. If this value is not close to midscale, increase the value of POS_AFE_OFFSET or NEG_AFE_OFFSET (depending on if the CINx input is connected to the positive or negative input of the converter) by 1. The CINx connections are determined by the STAGEx_CONNECTION registers. 3. If the CDC value in CDC_RESULT_Sx is now closer to midscale, repeat Step 2. If the CDC value is further POS_AFE_OFFSET POS_AFE_OFFSET_SWAP BIT CINx + 16-BIT _ CDC 16 NEG_AFE_OFFSET_SWAP BIT –DAC (20pF RANGE) 6 NEG_AFE_OFFSET CINx_CONNECTION_SETUP 06663-021 Decimation Bits 00 01 10 11 CDC Output Rate Per Stage (ms) 3.072 1.536 0.768 0.768 6 Figure 24. Analog Front-End Offset Control CONVERSION SEQUENCER The AD7147 has an on-chip sequencer to implement conversion control for the input channels. Up to 12 conversion stages can be performed in one sequence. Each of the 12 conversions stages can measure the input from a different sensor. By using the Bank 2 registers, each stage can be uniquely configured to support multiple capacitance sensor interface requirements. For example, a slider sensor can be assigned to STAGE1 through STAGE8, with a button sensor assigned to STAGE0. For each conversion stage, the input mux that connects the CINx inputs to the converter can have a unique setting. The AD7147 on-chip sequence controller provides conversion control, beginning with STAGE0. Figure 25 shows a block diagram of the CDC conversion stages and CINx inputs. A conversion sequence is defined as a sequence of CDC conversions starting at STAGE0 and ending at the stage determined by the value programmed in the SEQUENCE_STAGE_NUM bits. Depending on the number and type of capacitance sensors that are used, not all conversion stages are required. Use the SEQUENCE_STAGE_NUM bits to set the number of conversions in one sequence. This number depends on the sensor interface requirements. For example, the register should be set to 5 if the CINx inputs are mapped to only six conversion stages. In addition, the STAGE_CAL_EN register should be set according to the number of stages that are used. The number of required conversion stages depends solely on the number of sensors attached to the AD7147. Figure 26 shows how many conversion stages are required for each sensor and how many inputs to the AD7147 each sensor requires. Rev. E | Page 15 of 70 AD7147 Data Sheet A wheel sensor requires eight stages, whereas a slider requires two stages. The result from each stage is used by the host software to determine the user’s position on the slider or wheel. The algorithms that perform this process are available from Analog Devices and are free of charge, but require signing a software license. A button sensor generally requires one sequencer stage; this is shown in Figure 26 as B1. However, it is possible to configure two button sensors to operate differentially for one conversion stage. Only one button can be activated at a time; pressing both buttons simultaneously results in neither button being activated. The configuration with two button sensors operating differentially requires one conversion stage and is shown in Figure 26, with B2 and B3 representing the differentially configured button sensors. STAGE11 STAGE10 STAGE9 STAGE8 STAGE7 STAGE6 STAGE5 STAGE4 STAGE3 STAGE2 STAGE1 STAGE0 CIN0 CIN1 CIN6 CIN7 CIN8 CIN9 SEQ UEN CE CIN5 Σ-∆ 16-BIT ADC I ON CIN4 CO NVE RS CIN3 SWITCH MATRIX CIN2 CIN10 06663-022 CIN11 CIN12 Figure 25. CDC Conversion Stages AD7147 SEQUENCER STAGE0 + CDC – STAGE1 + CDC – STAGE2 + CDC – SEQUENCER B1 STAGE8 + CDC – B2 STAGE9 + CDC – B3 STAGE3 + CDC – STAGE4 + CDC – SEQUENCER STAGE5 + CDC – STAGE10 + CDC – AD7147 SLIDER STAGE6 + CDC – STAGE7 + CDC – Figure 26. Sequencer Setup for Sensors Rev. E | Page 16 of 70 STAGE11 + CDC – 06663-023 SCROLL WHEEL AD7147 BUTTONS Data Sheet AD7147 CDC CONVERSION SEQUENCE TIME Table 10. CDC Conversion Times for Full Power Mode Conversion Time (ms) Decimation = 128 1.536 3.072 4.608 6.144 7.68 9.216 10.752 12.288 13.824 15.36 16.896 18.432 Decimation = 64 0.768 1.536 2.304 3.072 3.84 4.608 5.376 6.144 6.912 7.68 8.448 9.216 The time required for the CDC to complete the measurement of all 12 stages is defined as the CDC conversion sequence time. The SEQUENCE_STAGE_NUM and DECIMATION bits determine the conversion time, as listed in Table 10. For example, if the device is operated with a decimation rate of 128 and the SEQUENCE_STAGE_NUM bit is set to 5 for the conversion of six stages in a sequence, the conversion sequence time is 9.216 ms. Full Power Mode CDC Conversion Sequence Time The full power mode CDC conversion sequence time for all 12 stages is set by configuring the SEQUENCE_STAGE_NUM and DECIMATION bits as outlined in Table 10. Figure 27 shows a simplified timing diagram of the full power mode CDC conversion time. The full power mode CDC conversion time (tCONV_FP) is set using the values shown in Table 10. the AD7147 automatically wakes up, performing a conversion every 800 ms. Table 11. LP_CONV_DELAY Settings LP_CONV_DELAY Bits 00 01 10 11 tCONV_LP tCONV_FP CDC CONVERSION CONVERSION SEQUENCE N LP_CONV_DELAY CONVERSION SEQUENCE N + 1 Figure 28. Low Power Mode CDC Conversion Sequence Time CONVERSION CONVERSION SEQUENCE N + 1 SEQUENCE N + 2 06663-024 CONVERSION SEQUENCE N Delay Between Conversions (ms) 200 400 600 800 Figure 28 shows a simplified timing example of the low power mode CDC conversion time. As shown, the low power mode CDC conversion time is set by tCONV_FP and the LP_CONV_DELAY bits. tCONV_FP CDC CONVERSION Decimation = 256 3.072 6.144 9.216 12.288 15.36 18.432 21.504 24.576 27.648 30.72 33.792 36.864 06663-025 SEQUENCE_STAGE_NUM 0 1 2 3 4 5 6 7 8 9 10 11 Figure 27. Full Power Mode CDC Conversion Sequence Time Low Power Mode CDC Conversion Sequence Time with Delay The frequency of each CDC conversion while operating in the low power automatic wake-up mode is controlled by using the LP_CONV_DELAY bits located at Address 0x000[3:2] in addition to the registers listed in Table 10. This feature provides some flexibility for optimizing the tradeoff between the conversion time needed to meet system requirements and the power consumption of the AD7147. CDC CONVERSION RESULTS Certain high resolution sensors require the host to read back the CDC conversion results for processing. The registers required for host processing are located in the Bank 3 registers. The host processes the data read back from these registers using a software algorithm in order to determine position information. In addition to the results registers in the Bank 3 registers, the AD7147 provides the 16-bit CDC output data directly, starting at Address 0x00B of Bank 1. Reading back the CDC 16-bit conversion data register allows for customer-specific application data processing. For example, maximum power savings is achieved when the LP_CONV_DELAY bits are set to 11. With a setting of 11, Rev. E | Page 17 of 70 AD7147 Data Sheet CAPACITANCE SENSOR INPUT CONFIGURATION Each input connection from the external capacitance sensors to the converter of the AD7147 can be uniquely configured by using the registers in Bank 2 (see Table 38). These registers are used to configure the input pin connection setups, sensor offsets, sensor sensitivities, and sensor limits for each stage. Each sensor can be individually optimized. For example, a button sensor connected to STAGE0 can have different sensitivity and offset values than a button with another function that is connected to a different stage. CINx INPUT MULTIPLEXER SETUP Table 34 and Table 35 list the available options for the CINx_CONNECTION_SETUP bits when the sensor input pins are connected to the CDC. The AD7147 has an on-chip multiplexer that routes the input signals from each CINx pin to the input of the converter. Each input pin can be tied to either the negative or positive input of the CDC, or it can be left floating. Each input can also be internally connected to the BIAS signal to help prevent cross coupling. If an input is not used, always connect it to the BIAS. Connecting a CINx input pin to the positive CDC input results in an increase in CDC output code when the corresponding sensor is activated. Connecting a CINx input pin to the negative CDC input results in a decrease in CDC output code when the corresponding sensor is activated. The AD7147 performs a sequence of 12 conversions. The multiplexer can have different settings for each of the 12 conversions. For example, CIN0 is connected to the negative CDC input for conversion STAGE1, left floating for conversion STAGE1, and so on, for all 12 conversion stages. For each CINx input for each conversion stage, two bits control how the input is connected to the converter, as shown in Figure 29. Examples To connect CIN3 to the positive CDC input on Stage 0 use the following setting: STAGE0_CONNECTION[6:0] = 0xFFBF STAGE0_CONNECTION[12:7] = 0x2FFF CIN CONNECTION SETUP BITS STAGE5_CONNECTION[6:0] = 0xFFFE STAGE5_CONNECTION[12:7] = 0x37FF SINGLE-ENDED CONNECTIONS TO THE CDC A single-ended connection to the CDC is defined as one CINx input connected to either the positive or negative CDC input for one conversion stage. A differential connection to the CDC is defined as one CINx input connected to the positive CDC input and a second CINx input connected to the negative input of the CDC for one conversion stage. For any stage, if a single-ended connection to the CDC is made in that stage, the SE_CONNECTION_SETUP bits (Bits[13:12] in the STAGEx_CONNECTION[12:7] register) should be applied as follows: • • • • SE_CONNECTION_SETUP = 00: do not use. SE_CONNECTION_SETUP = 01: single-ended connection. For this stage, there is one CINx connected to the positive CDC input. SE_CONNECTION_SETUP = 10: single-ended connection. For this stage, there is one CINx connected to the negative CDC input. SE_CONNECTION_SETUP = 11: differential connection. For this stage, there is one CINx connected to the nega tive CDC input and one CINx connected to the positive CDC input. These bits ensure that during a single-ended connection to the CDC, the input paths to both CDC terminals are matched, which in turn improves the power-supply rejection of the converter measurement. These bits should be applied in addition to setting the other bits in the STAGEx_CONNECTION registers, as outlined in the CINx Input Multiplexer Setup section. If more than one CINx input is connected to either the positive or negative input of the converter for the same conversion, set SE_CONNECTION_SETUP to 11. For example, if CIN0 and CIN3 are connected to the positive input of the CDC, set SE_CONNECTION_SETUP to 11. CIN SETTING 00 CINx FLOATING 01 CINx CONNECTED TO NEGATIVE CDC INPUT + 10 CINx CONNECTED TO POSITIVE CDC INPUT – 11 CINx CONNECTED TO BIAS CDC Figure 29. Input Mux Configuration Options Rev. E | Page 18 of 70 06663-026 CIN0 CIN1 CIN2 CIN3 CIN4 CIN5 CIN6 CIN7 CIN8 CIN9 CIN10 CIN11 CIN12 To connect CIN0 to the positive CDC input and CIN12 to the negative CIN input on Stage 5 use the following settings: Data Sheet AD7147 NONCONTACT PROXIMITY DETECTION The AD7147 internal signal processing continuously monitors all capacitance sensors for noncontact proximity detection. This feature provides the ability to detect when a user is approaching a sensor, at which time all internal calibration is immediately disabled while the AD7147 is automatically configured to detect a valid contact. The proximity control register bits are described in Table 12. The FP_PROXIMITY_CNT and LP_PROXIMITY_CNT register bits control the length of the calibration disable period after the user stops touching the sensor and is not in close proximity to the sensor during full or low power mode. The calibration is disabled during this period and then enabled again. Figure 30 and Figure 31 show examples of how these registers are used to set the calibration disable periods for the full and low power modes. by the PROXIMITY_RECAL_LVL bits for a set period of time known as the recalibration timeout. In full power mode, the recalibration timeout is controlled by FP_PROXIMITY_RECAL; in low power mode, by LP_PROXMTY_RECAL. The recalibration timeout in full power mode is the value of the FP_PROXIMITY_RECAL multiplied by the time for one conversion sequence in full power mode. The recalibration timeout in low power mode is the value of the LP_PROXIMITY_ RECAL multiplied by the time for one conversion sequence in low power mode. The calibration disable period in full power mode is the value of the FP_PROXIMITY_CNT multiplied by 16 multiplied by the time for one conversion sequence in full power mode. The calibration disable period in low power mode is the value of the LP_PROXIMITY_CNT multiplied by 4 multiplied by the time for one conversion sequence in low power mode. Figure 32 and Figure 33 show examples of how the FP_PROXIMITY_RECAL and LP_PROXIMITY_RECAL register bits control the timeout period before a recalibration while operating in the full and low power modes. In these examples, a user approaches a sensor and then leaves, but the proximity detection remains active. The measured CDC value exceeds the stored ambient value by the amount set in the PROXIMITY_RECAL_LVL bits for the entire timeout period. The sensor is automatically recalibrated at the end of the timeout period. RECALIBRATION PROXIMITY SENSITIVITY In certain situations (for example, when a user hovers over a sensor for a long time), the proximity flag can be set for a long period. The environmental calibration on the AD7147 is suspended while proximity is detected, but changes may occur to the ambient capacitance level during the proximity event. This means that the ambient value stored on the AD7147 no longer represents the actual ambient value. In this case, even when the user is not in close proximity to the sensor, the proximity flag may still be set. This situation can occur if the user interaction creates some moisture on the sensor, causing the new sensor ambient value to be different from the expected value. In this situation, the AD7147 automatically forces a recalibration internally. This ensures that the ambient values are recalibrated, regardless of how long the user hovers over the sensor. A recalibration ensures maximum AD7147 sensor performance. The fast filter in Figure 34 is used to detect when someone is close to the sensor (proximity). Two conditions, detected by Comparator 1 and Comparator 2, set the internal proximity detection signal: Comparator 1 detects when a user is approaching or leaving a sensor, and Comparator 2 detects when a user hovers over a sensor or approaches a sensor very slowly. The AD7147 recalibrates automatically when the measured CDC value exceeds the stored ambient value by an amount determined The sensitivity of Comparator 1 is controlled by the PROXIMITY_DETECTION_RATE bits. For example, if PROXIMITY_DETECTION_RATE is set to 4, the Proximity 1 signal is set when the absolute difference between WORD1 and WORD3 exceeds (4 × 16) LSB codes. The PROXIMITY_RECAL_LVL bits (Address 0x003) control the sensitivity of Comparator 2. For example, if PROXIMITY_ RECAL_LVL is set to 75, the Proximity 2 signal is set when the absolute difference between the fast filter average value and the ambient value exceeds (75 × 16) LSB codes. Rev. E | Page 19 of 70 AD7147 Data Sheet Table 12. Proximity Control Registers (See Figure 34) Bit Name FP_PROXIMITY_CNT LP_PROXIMITY_CNT FP_PROXIMITY_RECAL LP_PROXIMITY_RECAL PROXIMITY_RECAL_LVL Length (Bits) 4 4 8 6 8 Register Address 0x002[7:4] 0x002[11:8] 0x004[9:0] 0x004[15:10] 0x003[7:0] PROXIMITY_DETECTION_RATE 6 0x003[13:8] USER APPROACHES SENSOR Description Calibration disable time in full power mode. Calibration disable time in low power mode. Full power mode proximity recalibration time. Low power mode proximity recalibration time. Proximity recalibration level. This value multiplied by 16 controls the sensitivity of Comparator 2 (see Figure 34). Proximity detection rate. This value multiplied by 16 controls the sensitivity of Comparator 1 (see Figure 34). USER LEAVES SENSOR AREA tCONV_FP CDC CONVERSION SEQUENCE (INTERNAL) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 tCALDIS CALIBRATION (INTERNAL) CALIBRATION DISABLED CALIBRATION ENABLED 06663-027 PROXIMITY DETECTION (INTERNAL) Figure 30. Example of Full Power Mode Proximity Detection (FP_PROXIMITY_CNT = 1) USER APPROACHES SENSOR USER LEAVES SENSOR AREA tCONV_LP CDC CONVERSION SEQUENCE (INTERNAL) 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 tCALDIS PROXIMITY DETECTION (INTERNAL) CALIBRATION DISABLED CALIBRATION ENABLED NOTES 1. SEQUENCE CONVERSION TIME tCONV_LP = tCONV_FP + LP_CONV_DELAY. 2. PROXIMITY IS SET WHEN USER APPROACHES THE SENSOR, AT WHICH TIME THE INTERNAL CALIBRATION IS DISABLED. 3. tCALDIS = (tCONV_LP × LP_PROXIMITY_CNT × 4). Figure 31. Example of Low Power Mode Proximity Detection (LP_PROXIMITY_CNT = 4) Rev. E | Page 20 of 70 06663-028 CALIBRATION (INTERNAL) Data Sheet AD7147 USER APPROACHES SENSOR tRECAL MEASURED CDC VALUE > STORED AMBIENT BY PROXIMITY_RECAL _LVL USER LEAVES SENSOR AREA tCONV_FP 16 CDC CONVERSION SEQUENCE (INTERNAL) 30 70 tCALDIS PROXIMITY DETECTION (INTERNAL) CALIBRATION (INTERNAL) CALIBRATION DISABLED RECALIBRATION TIMEOUT CALIBRATION ENABLED tRECAL_TIMEOUT RECALIBRATION COUNTER (INTERNAL) 06663-029 NOTES 1. SEQUENCE CONVERSION TIME tCONV_FP (SEE TABLE 10). 2. tCALDIS = tCONV_FP × FP_PROXIMITY_CNT × 16. 3. tRECAL_TIMEOUT = tCONV_FP × FP_PROXIMITY_RECAL. 4. tRECAL = 2 × tCONV_FP . Figure 32. Example of Full Power Mode Proximity Detection with Forced Recalibration (FP_PROXIMITY_CNT = 1 and FP_PROXIMITY_RECAL = 40) USER APPROACHES SENSOR tRECAL MEASURED CDC VALUE > STORED AMBIENT BY PROXIMITY_RECAL _LVL USER LEAVES SENSOR AREA tCONV_LP 16 30 PROXIMITY DETECTION (INTERNAL) tCALDIS CALIBRATION (INTERNAL) CALIBRATION DISABLED 70 RECALIBRATION TIMEOUT CALIBRATION ENABLED tRECAL_TIMEOUT RECALIBRATION (INTERNAL) NOTES 1. SEQUENCE CONVERSION TIME tCONV_LP = tCONV_FP + LP_CONV_DELAY. 2. tCALDIS = tCONV_LP × LP_PROXIMITY_CNT × 4. 3. tRECAL_TIMEOUT = tCONV_LP × LP_PROXIMITY_RECAL. 4. tRECAL = 2 × tCONV_LP . Figure 33. Example of Low Power Mode Proximity Detection with Forced Recalibration (LP_PROXIMITY_CNT = 4 and LP_PROXIMITY_RECAL = 40) Rev. E | Page 21 of 70 06663-030 CDC CONVERSION SEQUENCE (INTERNAL) AD7147 Data Sheet FF_SKIP_CNT The proximity detection fast FIFO is used by the on-chip logic to determine if proximity is detected. The fast FIFO expects to receive samples from the converter at a set rate. FF_SKIP_CNT is used to normalize the frequency of the samples going into the FIFO, regardless of how many conversion stages are in a sequence. In Register 0x002, Bits[3:0] are the fast filter skip control, FF_SKIP_CNT. This value determines which CDC samples are not used (skipped) by the proximity detection fast FIFO. Determining the FF_SKIP_CNT value is required only once during the initial setup of the capacitance sensor interface. Table 13 shows how FF_SKIP_CNT controls the update rate of the fast FIFO. The recommended value for the setting when using all 12 conversion stages on the AD7147 is 0000, or no samples skipped. Table 13. FF_SKIP_CNT Settings FF_SKIP _CNT 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Decimation = 64 0.768 × (SEQUENCE_STAGE_NUM + 1) ms 1.536 × (SEQUENCE_STAGE_NUM + 1) ms 2.3 × (SEQUENCE_STAGE_NUM + 1) ms 3.072 × (SEQUENCE_STAGE_NUM + 1) ms 3.84 × (SEQUENCE_STAGE_NUM + 1) ms 4.6 × (SEQUENCE_STAGE_NUM + 1) ms 5.376 × (SEQUENCE_STAGE_NUM + 1) ms 6.144 × (SEQUENCE_STAGE_NUM + 1) ms 6.912 × (SEQUENCE_STAGE_NUM + 1) ms 7.68 × (SEQUENCE_STAGE_NUM + 1) ms 8.448 × (SEQUENCE_STAGE_NUM + 1) ms 9.216 × (SEQUENCE_STAGE_NUM + 1) ms 9.984 × (SEQUENCE_STAGE_NUM + 1) ms 10.752 × (SEQUENCE_STAGE_NUM + 1) ms 11.52 × (SEQUENCE_STAGE_NUM + 1) ms 12.288 × (SEQUENCE_STAGE_NUM + 1) ms FAST FIFO Update Rate Decimation = 128 1.536 × (SEQUENCE_STAGE_NUM + 1) ms 3.072 × (SEQUENCE_STAGE_NUM + 1) ms 4.608 × (SEQUENCE_STAGE_NUM + 1) ms 6.144 × (SEQUENCE_STAGE_NUM + 1) ms 7.68 × (SEQUENCE_STAGE_NUM + 1) ms 9.216 × (SEQUENCE_STAGE_NUM + 1) ms 10.752 × (SEQUENCE_STAGE_NUM + 1) ms 12.288 × (SEQUENCE_STAGE_NUM + 1) ms 13.824 × (SEQUENCE_STAGE_NUM + 1) ms 15.36 × (SEQUENCE_STAGE_NUM + 1) ms 16.896 × (SEQUENCE_STAGE_NUM + 1) ms 18.432 × (SEQUENCE_STAGE_NUM + 1) ms 19.968 × (SEQUENCE_STAGE_NUM + 1) ms 21.504 × (SEQUENCE_STAGE_NUM + 1) ms 23.04 × (SEQUENCE_STAGE_NUM + 1) ms 24.576 × (SEQUENCE_STAGE_NUM + 1) ms Rev. E | Page 22 of 70 Decimation = 256 3.072 × (SEQUENCE_STAGE_NUM + 1) ms 6.144 × (SEQUENCE_STAGE_NUM + 1) ms 9.216 × (SEQUENCE_STAGE_NUM + 1) ms 12.288 × (SEQUENCE_STAGE_NUM + 1) ms 15.36 × (SEQUENCE_STAGE_NUM + 1) ms 18.432 × (SEQUENCE_STAGE_NUM + 1) ms 21.504 × (SEQUENCE_STAGE_NUM + 1) ms 24.576 × (SEQUENCE_STAGE_NUM + 1) ms 27.648 × (SEQUENCE_STAGE_NUM + 1) ms 30.72 × (SEQUENCE_STAGE_NUM + 1) ms 33.792 × (SEQUENCE_STAGE_NUM + 1) ms 36.864 × (SEQUENCE_STAGE_NUM + 1) ms 39.936 × (SEQUENCE_STAGE_NUM + 1) ms 43.008 × (SEQUENCE_STAGE_NUM + 1) ms 46.08 × (SEQUENCE_STAGE_NUM + 1) ms 49.152 × (SEQUENCE_STAGE_NUM + 1) ms Data Sheet CDC AD7147 FP_PROXIMITY_CNT REGISTER 0x002 16 LP_PROXIMITY_CNT REGISTER 0x002 STAGEx_FF_WORD0 STAGEx_FF_WORD1 STAGEx_FF_WORD2 COMPARATOR 1 |WORD0 – WORD3| PROXIMITY 1 PROXIMITY STAGEx_FF_WORD3 STAGEx_FF_WORD4 STAGEx_FF_WORD5 STAGEx_FF_WORD6 STAGEx_FF_WORD7 PROXIMITY_DETECTION_RATE REGISTER 0x003 7 WORD(N) Σ N=0 FP_PROXIMITY_RECAL REGISTER 0x004 LP_PROXIMITY_RECAL REGISTER 0x004 PROXIMITY 2 BANK 3 REGISTERS PROXIMITY TIMING CONTROL LOGIC STAGEx_FF_AVG BANK 3 REGISTERS 8 COMPARATOR 2 |AVERAGE – AMBIENT| STAGEx_FF_WORDx PROXIMITY SLOW_FILTER_UPDATE_LVL REGISTER 0x003 STAGEx_SF_WORD0 STAGEx_SF_WORD1 STAGEx_SF_WORD2 STAGEx_SF_WORD3 PROXIMITY_RECAL_LVL REGISTER 0x003 STAGEx_SF_AMBIENT BANK 3 REGISTERS STAGEx_SF_WORD4 STAGEx_SF_WORD5 STAGEx_SF_WORD6 AMBIENT VALUE STAGEx_SF_WORDx SENSOR CONTACT t STAGEx_SF_WORD7 BANK 3 REGISTERS NOTES 1. SLOW_FILTER_EN, WHICH IS THE NAME OF THE OUTPUT OF COMPARATOR 3, IS SET AND SW1 IS CLOSED WHEN |STAGEx_SF_WORD0 – CDC VALUE| EXCEEDS THE VALUE PROGRAMMED IN THE SLOW_FILTER_UPDATE_LVL REGISTER PROVIDING PROXIMITY IS NOT SET. 2. PROXIMITY 1 IS SET WHEN |STAGEx_FF_WORD0 – STAGEx_FF_WORD3| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_DETECTION_RATE REGISTER. 3. PROXIMITY 2 IS SET WHEN |AVERAGE – AMBIENT| EXCEEDS THE VALUE PROGRAMMED IN THE PROXIMITY_RECAL_LVL REGISTER. 4. DESCRIPTION OF COMPARATOR FUNCTIONS: COMPARATOR 1: USED TO DETECT WHEN A USER IS APPROACHING OR LEAVING A SENSOR. COMPARATOR 2: USED TO DETECT WHEN A USER IS HOVERING OVER A SENSOR OR APPROACHING A SENSOR VERY SLOWLY. ALSO USED TO DETECT IF THE SENSOR AMBIENT LEVEL HAS CHANGED AS A RESULT OF THE USER INTERACTION. FOR EXAMPLE, HUMIDITY OR DIRT LEFT BEHIND ON SENSOR. COMPARATOR 3: USED TO ENABLE THE SLOW FILTER UPDATE RATE. THE SLOW FILTER IS UPDATED WHEN SLOW_FILTER_EN IS SET AND PROXIMITY IS NOT SET. Figure 34. AD7147 Proximity-Detection Logic Rev. E | Page 23 of 70 06663-031 COMPARATOR 3 WORD0 – CDC VALUE CDC OUTPUT CODE SLOW_FILTER_EN SW1 AD7147 Data Sheet ENVIRONMENTAL CALIBRATION The ambient compensation control registers provide the host with access to general setup and controls for the compensation algorithm. On-chip RAM stores the compensation data for each conversion stage, as well as setup information specific for each stage. Figure 35 shows an example of the ideal behavior of a capacitance sensor, where the CDC ambient level remains constant regardless of the environmental conditions. The CDC output shown is for a pair of differential button sensors, where one sensor caused an increase and the other caused a decrease in measured capacitance when activated. The positive and negative sensor threshold levels are calculated as a percentage of the STAGEx_OFFSET_HIGH and STAGEx_OFFSET_LOW values and are based on the threshold sensitivity settings and the ambient value. These values are sufficient to detect a sensor contact and result in the AD7147 asserting the INT output when the threshold levels are exceeded. CDC AMBIENT VALUE STAGEx_LOW_THRESHOLD 06663-032 SENSOR 2 INT ASSERTED t CHANGING ENVIRONMENTAL CONDITIONS Figure 35. Ideal Sensor Behavior with a Constant Ambient Level CAPACITANCE SENSOR BEHAVIOR WITHOUT CALIBRATION Figure 36 shows the typical behavior of a capacitance sensor when calibration is not applied. This figure shows ambient levels drifting over time as environmental conditions change. As a result of the initial threshold levels remaining constant while the ambient levels drift upward, Sensor 2 fails to detect a user contact in this example. The Capacitance Sensor Behavior with Calibration section describes how the AD7147 adaptive calibration algorithm prevents such errors from occurring. SENSOR 1 INT ASSERTED STAGEx_HIGH_THRESHOLD CDC AMBIENT VALUE DRIFTING STAGEx_LOW_THRESHOLD SENSOR 2 INT NOT ASSERTED t CHANGING ENVIRONMENTAL CONDITIONS Figure 36. Typical Sensor Behavior Without Calibration Rev. E | Page 24 of 70 06663-033 After the AD7147 is configured, the compensation logic runs automatically with each conversion when the AD7147 is not being touched. This allows the AD7147 to compensate for rapidly changing environmental conditions. STAGEx_HIGH_THRESHOLD CDC OUTPUT CODES The AD7147 achieves optimal and reliable sensor performance by continuously monitoring the CDC ambient levels and compensating for any environmental changes by adjusting the values of the STAGEx_HIGH_THRESHOLD register and the STAGEx_ LOW_THRESHOLD registers as described in the Threshold Equations section. The CDC ambient level is defined as the output level of the capacitance sensor during periods when the user is not approaching or in contact with the sensor. SENSOR 1 INT ASSERTED CDC OUTPUT CODES The AD7147 provides on-chip capacitance sensor calibration to automatically adjust for environmental conditions that have an effect on the ambient levels of the capacitance sensor. The output levels of the capacitance sensor are sensitive to temperature, humidity, and, in some cases, dirt. Data Sheet AD7147 THRESHOLD EQUATIONS On-Chip Logic Stage High Threshold STAGEx _ OFFSET _ HIGH 4 STAGEx _ OFFSET _ HIGH STAGEx _ OFFSET _ HIGH 4 POS _ THRESHOLD_ SENSITIVITY 16 STAGEx _ HIGH _ THRESHOLD STAGEx _ SF _ AMBIENT (1) On-Chip Logic Stage Low Threshold STAGEx _ OFFSET _ LOW STAGEx _ LOW _ THRESHOLD STAGEx _ SF _ AMBIENT 4 STAGEx _ OFFSET _ LOW STAGEx _ OFFSET _ LOW 4 NEG _ THRESHOLD _ SENSITIVITY 16 SLOW FIFO CAPACITANCE SENSOR BEHAVIOR WITH CALIBRATION The AD7147 on-chip adaptive calibration algorithm prevents sensor detection errors such as the one shown in Figure 36. This is achieved by monitoring the CDC ambient levels and readjusting the initial STAGEx_OFFSET_HIGH and STAGEx_OFFSET_LOW values according to the amount of ambient drift measured on each sensor. Based on the new stage offset values, the internal STAGEx_HIGH_THRESHOLD and STAGEx_LOW_THRESHOLD values described in Equation 1 and Equation 2 are automatically updated. This closed-loop routine ensures the reliability and repeatable operation of every sensor connected to the AD7147 when they are subjected to dynamic environmental conditions. Figure 37 shows a simplified example of how the AD7147 applies the adaptive calibration process, resulting in no interrupt errors even with changing CDC ambient levels due to dynamic environmental conditions. SENSOR 1 INT ASSERTED CDC OUTPUT CODES AVG_FP_SKIP and AVG_LP_SKIP In Register 0x001, Bits[13:12] are the slow FIFO skip control for full power mode, AVG_FP_SKIP. Bits[15:14] in the same register are the slow FIFO skip control for low power mode, AVG_LP_SKIP, and determine which CDC samples are not used (skipped) in the slow FIFO. Changing the values of the AVG_FP_SKIP and AVG_LP_SKIP bits slows down or speeds up the rate at which the ambient capacitance value tracks the measured capacitance value read by the converter: STAGEx_HIGH_THRESHOLD (POSTCALIBRATED REGISTER VALUE) 1 CDC AMBIENT VALUE DRIFTING STAGEx_LOW_THRESHOLD (POSTCALIBRATED REGISTER VALUE) 4 SENSOR 2 INT ASSERTED t Determining the AVG_FP_SKIP and AVG_LP_SKIP values is required only once during the initial setup of the capacitance sensor interface. The recommended values for these settings when using all 12 conversion stages on the AD7147 are as follows: 06663-034 1INITIAL STAGEx_OFFSET_HIGH REGISTER VALUE. 2POSTCALIBRATED REGISTER STAGEx_HIGH_THRESHOLD. 3POSTCALIBRATED REGISTER STAGEx_HIGH_THRESHOLD. 4INITIAL STAGEx_LOW_THRESHOLD. 5POSTCALIBRATED REGISTER STAGEx_LOW_THRESHOLD. 6POSTCALIBRATED REGISTER STAGEx_LOW_THRESHOLD. Slow FIFO update rate in full power mode = AVG_FP_SKIP × [(3 × Decimation Rate) × (SEQUENCE_STAGE_NUM + 1) × (FF_SKIP_CNT + 1) × 4 × 10−7]. Slow FIFO update rate in low power mode = (AVG_LP_SKIP + 1) × [(3 × Decimation Rate) × (SEQUENCE_STAGE_NUM + 1) × (FF_SKIP_CNT + 1) × 4 x 10−7]/[(FF_SKIP_CNT + 1) + LP_CONV_DELAY]. The slow FIFO is used by the on-chip logic to track the ambient capacitance value. The slow FIFO expects to receive samples from the converter at a rate between 33 ms and 40 ms. AVG_FP_SKIP and AVG_LP_SKIP are used to normalize the frequency of the samples going into the FIFO, regardless of how many conversion stages are in a sequence. 6 5 CHANGING ENVIRONMENTAL CONDITIONS As shown in Figure 34, there are a number of FIFOs implemented on the AD7147. These FIFOs are located in Bank 3 of the on-chip memory. The slow FIFOs are used by the on-chip logic to monitor the ambient capacitance level from each sensor. 3 2 (2) Figure 37. Typical Sensor Behavior with Calibration Applied on the Data Path Rev. E | Page 25 of 70 AVG_FP_SKIP = 00 = skip three samples AVG_LP_SKIP = 00 = skip zero samples AD7147 Data Sheet SLOW_FILTER_UPDATE_LVL The SLOW_FILTER_UPDATE_LVL controls whether the most recent CDC measurement goes into the slow FIFO (slow filter). The slow filter is updated when the difference between the current CDC value and the last value of the slow FIFO is greater than the value of SLOW_FILTER_UPDATE_LVL. This variable is in Ambient Control Register 1 (AMB_COMP_CTRL1) (Address 0x003). Rev. E | Page 26 of 70 Data Sheet AD7147 ADAPTIVE THRESHOLD AND SENSITIVITY The AD7147 provides an on-chip, self-adjusting adaptive threshold and sensitivity algorithm. This algorithm continuously monitors the output levels of each sensor and automatically rescales the threshold levels in proportion to the sensor area covered by the user. As a result, the AD7147 maintains optimal threshold and sensitivity levels for all users regardless of their finger sizes. The threshold level is always referenced from the ambient level and is defined as the CDC converter output level that must be exceeded before a valid sensor contact can occur. The sensitivity level is defined as how sensitive the sensor must be before a valid contact can be registered. Figure 38 provides an example of how the adaptive threshold and sensitivity algorithm works. The positive and negative sensor threshold levels are calculated as a percentage of the STAGEx_OFFSET_HIGH and STAGEx_OFFSET_LOW values and are based on the threshold sensitivity settings and the ambient value. After the AD7147 is configured, initial estimates are supplied for both STAGEx_OFFSET_HIGH and STAGEx_OFFSET_LOW, and then the calibration engine automatically adjusts the STAGEx_HIGH_THRESHOLD and STAGEx_LOW_THRESHOLD values for sensor response. The AD7147 tracks the average maximum and minimum values measured from each sensor. These values provide an indication of how the user is interacting with the sensor. A large finger results in a large average maximum or minimum value, whereas a small finger results in smaller values. When the average maximum or minimum value changes, the threshold levels are rescaled to ensure that the threshold levels are appropriate for the current user. Figure 39 shows how the minimum and maximum sensor responses are tracked by the on-chip logic. Reference A in Figure 38 shows a less sensitive threshold level for a user with small fingers and demonstrates the disadvantages of a fixed threshold level. By enabling the adaptive threshold and sensitivity algorithm, the positive and negative threshold levels are determined by the POS_THRESHOLD_SENSITIVITY and NEG_THRESHOLD_ SENSITIVITY bit values and by the most recent average maximum sensor output value. These bits can be used to select 16 different positive and negative sensitivity levels ranging between 25% and 95.32% of the most recent average maximum output level referenced from the ambient value. The smaller the sensitivity percentage setting, the easier it is to trigger a sensor activation. Reference B shows that the positive adaptive threshold level is set at almost mid-sensitivity with a 62.51% threshold level by setting POS_THRESHOLD_ SENSITIVITY = 1000. Figure 38 also provides a similar example for the negative threshold level, with NEG_THRESHOLD_SENSITIVITY = 0011. AVERAGE MAXIMUM VALUE STAGEx_OFFSET_HIGH IS UPDATED AVERAGE MAXIMUM VALUE 62.51% = POS_THRESHOLD _SENSITIVITY A STAGEx_OFFSET_HIGH 95.32% STAGEx_OFFSET_HIGH IS UPDATED 62.51% = POS_THRESHOLD _SENSITIVITY 25% 25% B AMBIENT LEVEL 25% NEG_THRESHOLD_SENSITIVITY = 39.08% STAGEx_OFFSET_LOW IS UPDATED STAGEx_OFFSET_LOW 25% NEG_THRESHOLD_SENSITIVITY = 39.08% 95.32% STAGEx_OFFSET_LOW IS UPDATED 95.32% SENSOR CONTACTED BY LARGE FINGER SENSOR CONTACTED BY SMALL FINGER Figure 38. Example of Threshold Sensitivity (POS_THRESHOLD_SENSITIVITY = 1000, NEG_THRESHOLD_SENSITIVITY = 0011) Rev. E | Page 27 of 70 06663-035 CDC OUTPUT CODES 95.32% AD7147 Data Sheet STAGEx_MAX_WORD0 STAGEx_MAX_WORD1 STAGEx_MAX_WORD2 BANK 3 REGISTERS STAGEx_MAX_WORD3 Σ-∆ 16-BIT CDC 16 MAXIMUM LEVEL DETECTION LOGIC STAGEx_MAX_AVG BANK 3 REGISTERS STAGEx_MAX_TEMP BANK 3 REGISTERS STAGEx_HIGH_THRESHOLD BANK 3 REGISTERS STAGEx_MIN_WORD0 STAGEx_MIN_WORD1 STAGEx_MIN_WORD2 BANK 3 REGISTERS STAGEx_MIN_WORD3 MINIMUM LEVEL DETECTION LOGIC STAGEx_MIN_AVG BANK 3 REGISTERS STAGEx_LOW_THRESHOLD BANK 3 REGISTERS 06663-036 STAGEx_MIN_TEMP BANK 3 REGISTERS Figure 39. Tracking the Minimum and Maximum Average Sensor Values Table 14. Additional Information About Environmental Calibration and Adaptive Threshold Registers Register/Bit NEG_THRESHOLD_SENSITIVITY NEG_PEAK_DETECT Register Location Bank 2 Bank 2 POS_THRESHOLD_SENSITIVITY POS_PEAK_DETECT Bank 2 Bank 2 STAGEx_OFFSET_LOW Bank 2 STAGEx_OFFSET_HIGH Bank 2 STAGEx_OFFSET_HIGH_CLAMP Bank 2 STAGEx_OFFSET_LOW_CLAMP Bank 2 STAGEx_SF_AMBIENT Bank 3 STAGEx_HIGH_THRESHOLD STAGEx_LOW_THRESHOLD Bank 3 Bank 3 Description Used in Equation 2. This value is programmed once at startup. Used by internal adaptive threshold logic only. The NEG_PEAK_DETECT is set to a percentage of the difference between the ambient CDC value and the minimum average CDC value. If the output of the CDC approaches the NEG_PEAK_DETECT percentage of the minimum average, the minimum average value is updated. Used in Equation 1. This value is programmed once at startup. Used by internal adaptive threshold logic only. The POS_PEAK_DETECT is set to a percentage of the difference between the ambient CDC value and the maximum average CDC value. If the output of the CDC approaches the POS_PEAK_DETECT percentage of the maximum average, the maximum average value is updated. Used in Equation 2. An initial value (based on sensor characterization) is programmed into this register at startup. The AD7147 on-chip calibration algorithm automatically updates this register based on the amount of sensor drift due to changing ambient conditions. Set this register to 80% of the STAGEx_OFFSET_LOW_CLAMP value. Used in Equation 1. An initial value (based on sensor characterization) is programmed into this register at startup. The AD7147 on-chip calibration algorithm automatically updates this register based on the amount of sensor drift due to changing ambient conditions. Set this register to 80% of the STAGEx_OFFSET_HIGH_CLAMP value. Used by internal environmental calibration and adaptive threshold algorithms only. An initial value (based on sensor characterization) is programmed into this register at startup. The value in this register prevents a user from causing the output value of a sensor to exceed the expected nominal value. Set this register to the maximum expected sensor response or the maximum change in CDC output code. Used by internal environmental calibration and adaptive threshold algorithms only. An initial value (based on sensor characterization) is programmed into this register at startup. The value in this register prevents a user from causing the output value of a sensor to exceed the expected nominal value. Set this register to the minimum expected sensor response or the minimum change in CDC output code. Used in Equation 1 and Equation 2. This is the ambient sensor output when the sensor is not touched, as calculated using the slow FIFO. Equation 1 value. Equation 2 value. Rev. E | Page 28 of 70 Data Sheet AD7147 INTERRUPT OUTPUT The AD7147 has an interrupt output that triggers an interrupt service routine on the host processor. The INT signal is on Pin 17 and is an open-drain output. There are three types of interrupt events on the AD7147: a CDC conversion-complete interrupt, a sensor touch interrupt, and a GPIO interrupt. Each interrupt has enable and status registers. The conversioncomplete and sensor-touch (sensor-activation) interrupts can be enabled on a per-conversion-stage basis. The status registers indicate what type of interrupt triggered the INT pin. Status registers are cleared, and the INT signal is reset high during a read operation. The signal returns high as soon as the read address has been set up. CDC CONVERSION-COMPLETE INTERRUPT The AD7147 interrupt signal asserts low to indicate the completion of a conversion stage and that new conversion result data is available in the registers. The interrupt can be independently enabled for each conversion stage. Each conversion-stage-complete interrupt can be enabled via the STAGEx_COMPLETE_INT_ENABLE register (Address 0x007). This register has a bit that corresponds to each conversion stage. Setting this bit to 1 enables the interrupt for that stage. Clearing this bit to 0 disables the conversion-complete interrupt for that stage. The AD7147 interrupt should be enabled only for the last stage in a conversion sequence. For example, if there are five conversion stages, only the conversion-complete interrupt for STAGE4 is enabled. Therefore, INT only asserts when all five conversion stages are complete and the host can read new data from all five result registers. The interrupt is cleared by reading the STAGEx_ COMPLETE_INT_STATUS register located at Address 0x00A. SENSOR-TOUCH INTERRUPT The sensor-touch interrupt mode is implemented when the host processor requires an interrupt only when a sensor is contacted. Configuring the AD7147 into this mode results in the interrupt being asserted when the user makes contact with the sensor and again when the user stops touching the sensor. The second interrupt is required to alert the host processor that the user is no longer contacting the sensor. The registers located at Address 0x005 and Address 0x006 are used to enable the interrupt output for each stage. The registers located at Address 0x008 and Address 0x009 are used to read back the interrupt status for each stage. Figure 40 shows the interrupt output timing during contact with one of the sensors connected to STAGE0 while operating in the sensor-touch interrupt mode. For a low limit configuration, the interrupt output is asserted as soon as the sensor is contacted and again after the user has stopped contacting the sensor. (Note that the interrupt output remains low until the host processor reads back the interrupt status registers located at Address 0x008 and Address 0x009.) The interrupt output is asserted when there is a change in the interrupt status bits. This can indicate that a user is touching the sensor(s) for the first time, the number of sensors being touched has changed, or the user is no longer touching the sensor(s). Reading the status bits in the interrupt status register shows the current sensor activations. FINGER ON SENSOR FINGER OFF SENSOR Register 0x00A is the conversion-complete interrupt status register. Each bit in this register corresponds to a conversion stage. If a bit is set, it means that the conversion-complete interrupt for the corresponding stage was triggered. This register is cleared upon a read if the underlying condition that triggered the interrupt is not present. 1 3 CONVERSION STAGE STAGE0 2 STAGE1 4 SERIAL READBACK 1USER TOUCHING SENSOR. 2ADDRESS 0x008 IS READ BACK TO 3USER STOPS TOUCHING SENSOR. 4ADDRESS 0x008 IS READ BACK TO CLEAR INTERRUPT. CLEAR INTERRUPT. Figure 40. Example of Sensor-Touch Interrupt Rev. E | Page 29 of 70 06663-037 INT OUTPUT AD7147 CONVERSIONS Data Sheet STAGE0 STAGE1 STAGE2 STAGE3 STAGE4 STAGE5 STAGE6 STAGE7 STAGE8 STAGE9 STAGE10 STAGE11 INT 1 2 3 SERIAL READS NOTES THIS IS AN EXAMPLE OF A CDC CONVERSION-COMPLETE INTERRUPT. THIS TIMING EXAMPLE SHOWS THAT THE INTERRUPT OUTPUT HAS BEEN ENABLED TO BE ASSERTED AT THE END OF A CONVERSION CYCLE FOR STAGE0, STAGE5, AND STAGE9. THE INTERRUPTS FOR ALL OTHER STAGES HAVE BEEN DISABLED. STAGEx CONFIGURATION PROGRAMMING NOTES FOR STAGE0, STAGE5, AND STAGE9 (x = 0, 5, 9): STAGEx_LOW_INT_ENABLE (ADDRESS 0x005) = 0 STAGEx_HIGH_INT_ENABLE (ADDRESS 0x006) = 0 STAGEx_COMPLETE_INT_ENABLE (ADDRESS 0x007) = 1 SERIAL READBACK REQUIREMENTS FOR STAGE0, STAGE5, AND STAGE9 (THIS READBACK OPERATION IS REQUIRED TO CLEAR THE INTERRUPT OUTPUT.): 1READ THE STAGE0_COMPLETE_INT_STATUS (ADDRESS 0x00A) BIT 2READ THE STAGE5_COMPLETE_INT_STATUS (ADDRESS 0x00A) BIT 3READ THE STAGE9_COMPLETE_INT_STATUS (ADDRESS 0x00A) BIT 06663-038 STAGEx CONFIGURATION PROGRAMMING NOTES FOR STAGE1 THROUGH STAGE8, STAGE10, AND STAGE11 (x = 1, 2, 3, 4, 5, 6, 7, 8, 10, 11): STAGEx_LOW_INT_ENABLE (ADDRESS 0x005) = 0 STAGEx_HIGH_INT_ENABLE (ADDRESS 0x006) = 0 STAGEx_COMPLETE_INT_ENABLE (ADDRESS 0x007) = 0 Figure 41. Example of Configuring the Registers for Conversion-Complete Interrupt Setup CONVERSIONS STAGE0 STAGE1 STAGE2 STAGE3 STAGE4 STAGE5 STAGE6 STAGE7 STAGE8 STAGE9 STAGE10 STAGE11 INT 1 4 2 SERIAL READS NOTES THIS IS AN EXAMPLE OF A SENSOR-TOUCH INTERRUPT FOR A CASE WHERE THE LOW THRESHOLD LEVELS WERE EXCEEDED. FOR EXAMPLE, THE SENSOR CONNECTED TO STAGE0 AND STAGE9 WERE CONTACTED, AND THE LOW THRESHOLD LEVELS WERE EXCEEDED, RESULTING IN THE INTERRUPT BEING ASSERTED. THE STAGE6 INTERRUPT WAS NOT ASSERTED BECAUSE THE USER DID NOT CONTACT THE SENSOR CONNECTED TO STAGE6. STAGEx CONFIGURATION PROGRAMMING NOTES FOR STAGE0, STAGE6, AND STAGE9 (x = 0, 6, 9): STAGEx_LOW_INT_ENABLE (ADDRESS 0x005) = 1 STAGEx_HIGH_INT_ENABLE (ADDRESS 0x006) = 0 STAGEx_COMPLETE_INT_ENABLE (ADDRESS 0x007) = 0 SERIAL READBACK REQUIREMENTS FOR STAGE0 AND STAGE9 (THIS READBACK OPERATION IS REQUIRED TO CLEAR THE INTERRUPT OUTPUT.): 1READ THE STAGE0_LOW_INT_STATUS (ADDRESS 0x008) BIT 2READ THE STAGE5_LOW_INT_STATUS (ADDRESS 0x008) BIT Figure 42. Example of Configuring the Registers for Sensor-Touch Interrupt Setup Rev. E | Page 30 of 70 06663-039 STAGEx CONFIGURATION PROGRAMMING NOTES FOR STAGE1 THROUGH STAGE7, STAGE8, STAGE10, AND STAGE11 (x = 1, 2, 3, 4, 5, 6, 7, 8, 10, 11): STAGEx_LOW_INT_ENABLE (ADDRESS 0x005) = 0 STAGEx_HIGH_INT_ENABLE (ADDRESS 0x006) = 0 STAGEx_COMPLETE_INT_ENABLE (ADDRESS 0x007) = 0 Data Sheet AD7147 GPIO INT OUTPUT CONTROL The INT output signal can be controlled by the GPIO pin when the GPIO is configured as an input. The GPIO is con-figured as an input by setting the GPIO_SETUP bits in the interrupt configuration register to 01. See the General-Purpose Input/Output (GPIO) section for more information on configuring the GPIO. Enable the GPIO interrupt by setting the GPIO_INT_ENABLE bit in Register 0x007 to 1, or disable the GPIO interrupt by clearing this bit to 0. The GPIO status bit in the conversioncomplete interrupt status register reflects the status of the GPIO interrupt. This bit is set to 1 when the GPIO has triggered INT. The bit is cleared upon reading the GPIO_INT_STATUS bit if the condition that caused the interrupt is no longer present. The GPIO interrupt can be set to trigger on a rising edge, falling edge, high level, or low level at the GPIO input pin. Table 15 shows how the settings of the GPIO_INPUT_CONFIG bits in the interrupt enable (STAGE_LOW_INT_ENABLE) register affect the behavior of INT. Figure 43 to Figure 46 show how the interrupt output is cleared upon a read from the GPIO_INT_STATUS bit. 1 1 SERIAL READBACK SERIAL READBACK GPIO INPUT HIGH WHEN REGISTER IS READ BACK GPIO INPUT HIGH WHEN REGISTER IS READ BACK GPIO INPUT GPIO INPUT INT OUTPUT INT OUTPUT GPIO INPUT LOW WHEN REGISTER IS READ BACK GPIO INPUT LOW WHEN REGISTER IS READ BACK GPIO INPUT GPIO INPUT INT OUTPUT 1READ GPIO_INT_STATUS BIT TO RESET INT OUTPUT. Figure 43. Example of INT Output Controlled by the GPIO Input (GP IO_SETUP = 01, GPIO_INPUT_CONFIG = 00) Figure 44. Example of INT Output Controlled by the GPIO Input (GPIO_SETUP = 01, GPIO_INPUT_CONFIG = 01) Rev. E | Page 31 of 70 06663-041 06663-040 1READ GPIO_INT_STATUS BIT TO RESET INT OUTPUT. INT OUTPUT AD7147 Data Sheet 1 1 SERIAL READBACK SERIAL READBACK GPIO INPUT LOW WHEN REGISTER IS READ BACK GPIO INPUT LOW WHEN REGISTER IS READ BACK GPIO INPUT GPIO INPUT INT OUTPUT INT OUTPUT GPIO INPUT HIGH WHEN REGISTER IS READ BACK GPIO INPUT HIGH WHEN REGISTER IS READ BACK GPIO INPUT GPIO INPUT 06663-042 1READ GPIO_INT_STATUS BIT TO RESET INT OUTPUT. NOTES 1READ GPIO_INT_STATUS BIT TO RESET INT OUTPUT. Figure 46. Example of INT Output Controlled by the GPIO Input (GPIO_SETUP = 01, GPIO_INPUT_CONFIG = 11) Figure 45. Example of INT Output Controlled by the GPIO Input (GPIO_SETUP = 01, GPIO_INPUT_CONFIG = 10) Table 15. GPIO Interrupt Behavior GPIO_INPUT_CONFIG 00 = Negative Level Triggered 00 = Negative Level Triggered 01 = Positive Edge Triggered 01 = Positive Edge Triggered 10 = Negative Edge Triggered 10 = Negative Edge Triggered 11 = Positive Level Triggered 11 = Positive Level Triggered GPIO Pin 1 0 1 0 1 0 1 0 GPIO_INT_STATUS 0 1 1 0 0 1 1 0 INT INT Behavior 1 0 0 1 1 0 0 1 Not triggered Asserted while signal on GPIO pin is low Pulses low at low-to-high GPIO transition Not triggered Pulses low at high-to-low GPIO transition Not triggered Asserted while signal on GPIO pin is high Not triggered Rev. E | Page 32 of 70 06663-043 INT OUTPUT INT OUTPUT Data Sheet AD7147 OUTPUTS ACSHIELD OUTPUT The AD7147 measures capacitance between CINx and ground. Any capacitance to ground on the signal path between the CINx pins and the sensor is included in the AD7147 conversion result. To eliminate stray capacitance to ground, the ACSHIELD signal should be used to shield the connection between the sensor and CINx, as shown in Figure 47. The plane around the sensors should also be connected to ACSHIELD. When the GPIO is configured as an output, the voltage level on the pin is set to either a low level or a high level, as defined by the GPIO_SETUP bits (see Table 16). The GPIO_INPUT_CONFIG bits in the interrupt enable register determine the response of the AD7147 to a signal on the GPIO pin when the GPIO is configured as an input. The GPIO can be configured as either active high or active low, as well as either edge triggered or level triggered (see Table 17). Table 17. GPIO_INPUT_CONFIG Bits 06663-044 Figure 47. ACSHIELD The ACSHIELD output is the same signal waveform as the excitation signal on CINx. Therefore, there is no ac current between CINx and ACSHIELD, and any capacitance between these pins does not affect the CINx charge transfer. Using ACSHIELD eliminates capacitance-to-ground pickup, which means that the AD7147 can be placed up to 10 cm away from the sensors. This allows the AD7147 to be placed on a separate PCB than that of the sensors if the connections between the sensors and the CINx inputs are correctly shielded using ACSHIELD. GPIO_INPUT_CONFIG 00 01 10 11 When GPIO is configured as an input, it triggers the interrupt output on the AD7147. Table 15 lists the interrupt output behavior for each of the GPIO configuration setups. USING THE GPIO TO TURN ON/OFF AN LED The GPIO on the AD7147 can be used to turn on and off an LED by setting the GPIO as either output high or low. Setting the GPIO output high turns on the LED; setting the GPIO output low turns off the LED. The GPIO pin connects to a transistor that provides the drive current for the LED. Suitable transistors include the KTC3875 from Korea Electronics Co., Ltd. (KEC). GENERAL-PURPOSE INPUT/OUTPUT (GPIO) V KTC3875 CC OR SIMILAR AD7147 The AD7147 has one GPIO pin. It can be configured as an input or an output. The GPIO_SETUP Bits[13:12] in the interrupt enable register determine how the GPIO pin is configured. Table 16. GPIO_SETUP Bits GPIO_SETUP 00 01 10 11 GPIO Configuration Triggered on negative level (active low) Triggered on positive edge (active high) Triggered on negative edge (active low) Triggered on positive level (active high) GPIO 06663-045 SENSOR PCB CIN0 AD7147 CIN1 CIN2 CIN3 ACSHIELD GND Figure 48. Controlling an LED Using the GPIO GPIO Configuration GPIO disabled Input Output low Output high Rev. E | Page 33 of 70 AD7147 Data Sheet SERIAL INTERFACE The AD7147 is available with an SPI-compatible interface. The AD7147-1 is available with an I2C-compatible interface. Both parts are the same, with the exception of the serial interface. Bits[15:11] of the command word must be set to 11100 to successfully begin a bus transaction. Bit 10 is the read/write bit; 1 indicates a read, and 0 indicates a write. SPI INTERFACE Bits[9:0] contain the target register address. When reading or writing to more than one register, this address indicates the address of the first register to be written to or read from. The AD7147 has a 4-wire serial peripheral interface (SPI). The SPI has a data input pin (SDI) for inputting data to the device, a data output pin (SDO) for reading data back from the device, and a data clock pin (SCLK) for clocking data into and out of the device. A chip select pin (CS) enables or disables the serial interface. CS is required for correct operation of the SPI. Data is clocked out of the AD7147 on the negative edge of SCLK and data is clocked into the device on the positive edge of SCLK. Writing Data Data is written to the AD7147 in 16-bit words. The first word written to the device is the command word, with the read/write bit set to 0. The master then supplies the 16-bit input data-word on the SDI line. The AD7147 clocks the data into the register addressed in the command word. If there is more than one word of data to be clocked in, the AD7147 automatically increments the address pointer and clocks the subsequent data-word into the next register. SPI Command Word All data transactions on the SPI bus begin with the master taking CS from high to low and sending out the command word. This indicates to the AD7147 whether the transaction is a read or a write and provides the address of the register from which to begin the data transfer. The following bit map shows the SPI command word. MSB 15 1 14 1 13 1 12 0 11 0 The AD7147 continues to clock in data on the SDI line until either the master finishes the write transition by pulling CS high or the address pointer reaches its maximum value. The AD7147 address pointer does not wrap around. When it reaches its maximum value, any data provided by the master on the SDI line is ignored by the AD7147. LSB 9:0 Register address 10 R/W 16-BIT COMMAND WORD ENABLE WORD SDI CW 15 CW 14 CW 13 R/W CW 12 CW 11 t2 SCLK CW 10 REGISTER ADDRESS CW 9 CW 8 t4 1 t1 2 3 4 5 CW 7 CW 6 CW 5 CW 4 16-BIT DATA CW 3 CW 2 CW 1 CW 0 D15 D14 D13 D2 D1 D0 t5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 30 31 32 t8 t3 NOTES 1. SDI BITS ARE LATCHED ON SCLK RISING EDGES. SCLK CAN IDLE HIGH OR LOW BETWEEN WRITE OPERATIONS. 2. ALL 32 BITS MUST BE WRITTEN: 16 BITS FOR THE CONTROL WORD AND 16 BITS FOR THE DATA. 3. 16-BIT COMMAND WORD SETTINGS FOR SERIAL WRITE OPERATION: CW [15:11] = 11100 (ENABLE WORD) CW [10] = 0 (R/W) CW [9:0] = [AD9, AD8, AD7, AD6, AD5, AD4, AD3, AD2, AD1, AD0] (10-BIT MSB-JUSTIFIED REGISTER ADDRESS) Figure 49. Single Register Write SPI Timing Rev. E | Page 34 of 70 06663-046 CS Data Sheet AD7147 16-BIT COMMAND WORD ENABLE WORD SDI CW 15 CW 14 CW 13 CW 12 CW 11 SCLK 1 2 3 4 5 CW 10 DATA FOR STARTING REGISTER ADDRESS STARTING REGISTER ADDRESS R/W CW 9 6 CW 8 7 8 CW 7 9 CW 6 CW 5 CW 4 11 10 CW 3 12 CW 2 13 CW 1 14 CW 0 15 D15 D14 16 17 D1 18 DATA FOR NEXT REGISTER ADDRESS D0 31 32 D15 D14 33 D1 34 D0 47 D15 48 49 CS 06663-047 NOTES 1. MULTIPLE SEQUENTIAL REGISTERS CAN BE LOADED CONTINUOUSLY. 2. THE FIRST (LOWEST ADDRESS) REGISTER ADDRESS IS WRITTEN, FOLLOWED BY MULTIPLE 16-BIT DATA-WORDS. 3. THE ADDRESS AUTOMATICALLY INCREMENTS WITH EACH 16-BIT DATA-WORD (ALL 16 BITS MUST BE WRITTEN). 4. CS IS HELD LOW UNTIL THE LAST DESIRED REGISTER HAS BEEN LOADED. 5. 16-BIT COMMAND WORD SETTINGS FOR SEQUENTIAL WRITE OPERATION: CW [15:11] = 11100 (ENABLE WORD) CW [10] = 0 (R/W) CW [9:0] = [AD9, AD8, AD7, AD6, AD5, AD4, AD3, AD2, AD1, AD0] (STARTING MSB-JUSTIFIED REGISTER ADDRESS) Figure 50. Sequential Register Write SPI Timing 16-BIT COMMAND WORD ENABLE WORD SDI CW 15 CW 14 CW 13 R/W CW 12 CW 11 t2 SCLK CW 10 REGISTER ADDRESS CW 9 CW 7 CW 8 t4 1 2 t1 3 4 5 CW 6 CW 5 CW 4 CW 3 CW 2 CW 1 CW 0 X X X X X X t5 6 7 8 9 10 11 12 13 14 15 16 17 18 30 19 t3 31 32 t8 CS t6 SDO XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX D15 D14 t7 D13 D2 D1 D0 XXX NOTES 1. SDI BITS ARE LATCHED ON SCLK RISING EDGES. SCLK CAN IDLE HIGH OR LOW BETWEEN WRITE OPERATIONS. 2. THE 16-BIT CONTROL WORD MUST BE WRITTEN ON SDI: 5 BITS FOR ENABLE WORD, 1 BIT FOR R/W, AND 10 BITS FOR REGISTER ADDRESS. 3. THE REGISTER DATA IS READ BACK ON THE SDO PIN. 4. X DENOTES DON’T CARE. 5. XXX DENOTES HIGH IMPEDANCE THREE-STATE OUTPUT. 6. CS IS HELD LOW UNTIL ALL REGISTER BITS HAVE BEEN READ BACK. 7. 16-BIT COMMAND WORD SETTINGS FOR SINGLE READBACK OPERATION: CW [15:11] = 11100 (ENABLE WORD) CW [10] = 1 (R/W) CW [9:0] = [AD9, AD8, AD7, AD6, AD5, AD4, AD3, AD2, AD1, AD0] (10-BIT MSB-JUSTIFIED REGISTER ADDRESS) 06663-048 16-BIT READBACK DATA Figure 51. Single Register Readback SPI Timing Reading Data A read transaction begins when the master writes the command word to the AD7147 with the read/write bit set to 1. The master then supplies 16 clock pulses per data-word to be read, and the AD7147 clocks out data from the addressed register on the SDO line. The first data-word is clocked out on the first falling edge of SCLK following the command word, as shown in Figure 51. The AD7147 continues to clock out data on the SDO line if the master continues to supply the clock signal on SCLK. The read transaction finishes when the master takes CS high. If the AD7147 address pointer reaches its maximum value, the AD7147 repeatedly clocks out data from the addressed register. The address pointer does not wrap around. Rev. E | Page 35 of 70 AD7147 Data Sheet 16-BIT COMMAND WORD ENABLE WORD R/W REGISTER ADDRESS SDI CW 15 CW 14 CW 13 CW 12 CW 11 CW 10 CW 9 CW 8 CW 7 SCLK 1 2 3 4 5 6 7 8 9 CW 6 10 CW 5 11 CW 4 12 CW 3 13 CW 2 14 CW 1 15 CW 0 X X 16 17 18 XXX XXX XXX D15 D14 X 31 X 32 X X 33 34 X X 47 48 X 49 CS XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX XXX D1 D0 READBACK DATA FOR STARTING REGISTER ADDRESS D15 D14 D1 D0 D15 READBACK DATA FOR NEXT REGISTER ADDRESS NOTES 1. MULTIPLE REGISTERS CAN BE READ BACK CONTINUOUSLY. 2. THE 16-BIT CONTROL WORD MUST BE WRITTEN ON SDI: 5 BITS FOR ENABLE WORD, 1 BIT FOR R/W, AND 10 BITS FOR REGISTER ADDRESS. 3. THE ADDRESS AUTOMATICALLY INCREMENTS WITH EACH 16-BIT DATA-WORD BEING READ BACK ON THE SDO PIN. 4. CS IS HELD LOW UNTIL ALL REGISTER BITS HAVE BEEN READ BACK. 5. X DENOTES DON’T CARE. 6. XXX DENOTES HIGH IMPEDANCE THREE-STATE OUTPUT. 7. 16-BIT COMMAND WORD SETTINGS FOR SEQUENTIAL READBACK OPERATION: CW [15:11] = 11100 (ENABLE WORD) CW [10] = 1 (R/W) CW [9:0] = [AD9, AD8, AD7, AD6, AD5, AD4, AD3, AD2, AD1, AD0] (STARTING MSB-JUSTIFIED REGISTER ADDRESS) 06663-049 SDO Figure 52. Sequential Register Readback SPI Timing I2C-COMPATIBLE INTERFACE The AD7147-1 supports the industry standard 2-wire I2C serial interface protocol. The two wires associated with the I2C timing are the SCLK and SDA inputs. The SDA is an I/O pin that allows both register write and register readback operations. The AD7147-1 is always a slave device on the I2C serial interface bus. It has a 7-bit device address, Address 0101 1XX. The lower two bits are set by tying the ADD0 and ADD1 pins high or low. The AD7147-1 responds when the master device sends its device address over the bus. The AD7147-1 cannot initiate data transfers on the bus. Table 18. AD7147-1 I2C Device Address ADD1 0 0 1 1 I2C Address 0101 100 0101 101 0101 110 0101 111 ADD0 0 1 0 1 Data Transfer 2 Data is transferred over the I C serial interface in 8-bit bytes. The master initiates a data transfer by establishing a start condition, defined as a high-to-low transition on the serial data line, SDA, while the serial clock line, SCLK, remains high. This indicates that an address/data stream follows. All slave peripherals connected to the serial bus respond to the start condition and shift in the next eight bits, consisting of a 7-bit address (MSB first) plus an R/W bit that determines the direction of the data transfer. The peripheral whose address corresponds to the transmitted address responds by pulling the data line low during the ninth clock pulse. This is known as the acknowledge bit. All other devices on the bus then remain idle while the selected device waits for data to be read from or written to it. If the R/W bit is 0, the master writes to the slave device. If the R/W bit is 1, the master reads from the slave device. Data is sent over the serial bus in a sequence of nine clock pulses—eight bits of data followed by an acknowledge bit from the slave device. Transitions on the data line must occur during the low period of the clock signal and remain stable during the high period, because a low-to-high transition when the clock is high can be interpreted as a stop signal. The number of data bytes transmitted over the serial bus in a single read or write operation is limited only by what the master and slave devices can handle. When all data bytes are read or written, a stop condition is established. A stop condition is defined by a low-to-high transition on SDA while SCLK remains high. If the AD7147 encounters a stop condition, it returns to its idle condition, and the address pointer register resets to Address 0x00. Rev. E | Page 36 of 70 Data Sheet AD7147 START AD7147-1 DEVICE ADDRESS REGISTER ADDRESS [A15:A8] REGISTER ADDRESS [A7:A0] SDA DEV A6 DEV A5 DEV A4 DEV DEV DEV A3 A2 A1 t1 DEV A0 R/W ACK A15 A14 A9 A8 ACK A7 A6 A1 A0 t3 SCLK 1 2 3 4 5 6 7 8 9 10 11 16 17 18 19 20 25 26 t2 ACK D15 D14 D9 REGISTER DATA [D7:D0] ACK D8 D7 D6 t4 27 28 29 34 D1 36 37 D0 ACK t6 38 43 AD7147-1 DEVICE ADDRESS t8 t5 35 START 44 45 DEV A6 DEV A5 1 2 DEV A4 t7 46 NOTES 1. A START CONDITION AT THE BEGINNING IS DEFINED AS A HIGH-TO-LOW TRANSITION ON SDA WHILE SCLK REMAINS HIGH. 2. A STOP CONDITION AT THE END IS DEFINED AS A LOW-TO-HIGH TRANSITION ON SDA WHILE SCLK REMAINS HIGH. 3. 7-BIT DEVICE ADDRESS [DEV A6:DEV A0] = [0 1 0 1 1 X X], WHERE X IS A DON’T CARE BIT. 4. 16-BIT REGISTER ADDRESS [A15:A0] = [X, X, X, X, X, X, A9, A8, A7, A6, A5, A4, A3, A2, A1, A0], WHERE X IS A DON’T CARE BIT. 5. REGISTER ADDRESS [A15:A8] AND REGISTER ADDRESS [A7:A0] ARE ALWAYS SEPARATED BY A LOW ACK BIT. 6. REGISTER DATA [D15:D8] AND REGISTER DATA [D7:D0] ARE ALWAYS SEPARATED BY A LOW ACK BIT. 3 06663-050 STOP REGISTER DATA [D15:D8] Figure 53. Example of I2C Timing for Single Register Write Operation Writing Data over the I2C Bus The process for writing to the AD7147-1 over the I2C bus is shown in Figure 53 and Figure 55. The device address is sent over the bus, followed by the R/W bit being set to 0 and then two bytes of data that contain the 10-bit address of the internal data register to be written. The following bit map shows the upper register address bytes. Note that Bit 7 to Bit 2 in the upper address byte are don’t care bits. The address is contained in the 10 LSBs of the register address bytes. MSB 7 X LSB 6 X 5 X 4 X 3 X 2 X 1 Register Address Bit 9 0 Register Address Bit 8 The following bit map shows the lower register address bytes. MSB 7 Reg Add Bit 7 6 Reg Add Bit 6 5 Reg Add Bit 5 4 Reg Add Bit 4 3 Reg Add Bit 3 2 Reg Add Bit 2 1 Reg Add Bit 1 LSB 0 Reg Add Bit 0 The third data byte contains the eight MSBs of the data to be written to the internal register. The fourth data byte contains the eight LSBs of data to be written to the internal register. The AD7147-1 address pointer register automatically increments after each write. This allows the master to sequentially write to all registers on the AD7147-1 in the same write transaction. However, the address pointer register does not wrap around after the last address. Therefore, any data written to the AD7147-1 after the address pointer has reached its maximum value is discarded. All registers on the AD7147-1 are 16 bits. Two consecutive 8-bit data bytes are combined and written to the 16-bit registers. To avoid errors, all writes to the device must contain an even number of data bytes. To finish the transaction, the master generates a stop condition on SDO, or generates a repeat start condition if the master is to maintain control of the bus. Reading Data over the I2C Bus To read from the AD7147-1, the address pointer register must first be set to the address of the required internal register. The master performs a write transaction, and then writes to the AD7147-1 to set the address pointer. Next, the master outputs a repeat start condition to keep control of the bus, or if this is not possible, ends the write transaction with a stop condition. A read transaction is initiated, with the R/W bit set to 1. The AD7147-1 supplies the upper eight bits of data from the addressed register in the first readback byte, followed by the lower eight bits in the next byte. This is shown in Figure 54 and Figure 55. Because the address pointer automatically increments after each read, the AD7147-1 continues to output readback data until the master sends a no acknowledge and stop condition to the bus. If the address pointer reaches its maximum value and the master continues to read from the part, the AD7147-1 repeatedly sends data from the last register that was addressed. Rev. E | Page 37 of 70 AD7147 Data Sheet START AD7147-1 DEVICE ADDRESS REGISTER ADDRESS [A15:A8] REGISTER ADDRESS [A7:A0] SDA DEV A6 DEV A5 DEV DEV DEV A2 A1 A3 DEV A4 t1 DEV A0 R/W ACK 7 8 9 A15 A14 A9 A8 A7 ACK A6 A1 A0 ACK t3 SCLK 1 2 3 5 4 6 10 11 16 17 18 19 20 25 26 27 t2 P REGISTER DATA [D7:D0] AD7147-1 DEVICE ADDRESS SR DEV A6 DEV A5 DEV A1 USING REPEATED START DEV A0 ACK R/W D7 D6 t4 28 29 P 34 30 D1 DEV A6 DEV A5 35 36 DEV A1 37 38 34 30 ACK t6 44 39 R/W ACK D7 D6 45 DEV A5 DEV A4 1 2 3 t7 46 D1 DEV A6 P D0 ACK t5 t4 29 AD7147-1 DEVICE ADDRESS REGISTER DATA [D7:D0] DEV A0 SEPARATE READ AND WRITE TRANSACTIONS 28 D0 t5 AD7147-1 DEVICE ADDRESS S t8 36 35 37 38 44 39 45 46 06663-051 NOTES 1. A START CONDITION AT THE BEGINNING IS DEFINED AS A HIGH-TO-LOW TRANSITION ON SDA WHILE SCLK REMAINS HIGH. 2. A STOP CONDITION AT THE END IS DEFINED AS A LOW-TO-HIGH TRANSITION ON SDA WHILE SCLK REMAINS HIGH. 3. THE MASTER GENERATES THE ACK AT THE END OF THE READBACK TO SIGNAL THAT IT DOES NOT WANT ADDITIONAL DATA. 4. 7-BIT DEVICE ADDRESS [DEV A6:DEV A0] = [0 1 0 1 1 X X], WHERE THE TWO LSB Xs ARE DON'T CARE BITS. 5. 16-BIT REGISTER ADDRESS [A15:A0] = [X, X, X, X, X, X, A9, A8, A7, A6, A5, A4, A3, A2, A1, A0], WHERE THE UPPER LSB Xs ARE DON’T CARE BITS. 6. REGISTER ADDRESS [A15:A8] AND REGISTER ADDRESS [A7:A0] ARE ALWAYS SEPARATED BY LOW ACK BITS. 7. REGISTER DATA [D15:D8] AND REGISTER DATA [D7:D0] ARE ALWAYS SEPARATED BY A LOW ACK BIT. 8. THE R/W BIT IS SET TO A1 TO INDICATE A READBACK OPERATION. Figure 54. Example of I2C Timing for Single Register Readback Operation WRITE DATA HIGH BYTE [15:8] WRITE DATA LOW BYTE [7:0] ACK WRITE DATA LOW BYTE [7:0] ACK ACK REGISTER ADDR LOW BYTE WRITE DATA HIGH BYTE [15:8] ACK REGISTER ADDR [7:0] ACK SR REGISTER ADDR [15:8] ACK 6-BIT DEVICE W ADDRESS ACK S ACK WRITE P 6-BIT DEVICE ADDRESS READ DATA HIGH BYTE [15:8] READ DATA LOW BYTE [7:0] READ DATA HIGH BYTE [15:8] ACK REGISTER ADDR HIGH BYTE ACK 6-BIT DEVICE W ADDRESS R ACK S ACK READ (USING REPEATED START) READ DATA LOW BYTE [7:0] ACK P S = START BIT P = STOP BIT SR = REPEATED START BIT READ DATA HIGH BYTE [15:8] READ DATA LOW BYTE [7:0] READ DATA HIGH BYTE [15:8] ACK S 6-BIT DEVICE ADDRESS ACK P READ DATA LOW BYTE [7:0] ACK P ACK = ACKNOWLEDGE BIT ACK = NO ACKNOWLEDGE BIT 06663-052 OUTPUT FROM MASTER OUTPUT FROM AD7147-1 REGISTER ADDR LOW BYTE R ACK REGISTER ADDR HIGH BYTE ACK 6-BIT DEVICE W ADDRESS ACK S ACK READ (WRITE TRANSACTION SETS UP REGISTER ADDRESS) Figure 55. Example of Sequential I2C Write and Readback Operations VDRIVE INPUT The supply voltage for the pins (SDO, SDI, SCLK, SDA, CS, INT, and GPIO) associated with both the I2C and SPI serial interfaces is supplied from the VDRIVE pin and is separate from the main VCC supply. This allows the AD7147 to be connected directly to processors whose supply voltage is less than the minimum operating voltage of the AD7147 without the need for external levelshifters. The VDRIVE pin can be connected to voltage supplies as low as 1.65 V and as high as VCC. Rev. E | Page 38 of 70 Data Sheet AD7147 PCB DESIGN GUIDELINES CAPACITIVE SENSOR BOARD MECHANICAL SPECIFICATIONS Table 19. Parameter Distance from Edge of Any Sensor to Edge of Grounded Metal Object Distance Between Sensor Edges1 Distance Between Bottom of Sensor Board and Controller Board or Grounded Metal Casing2 Symbol D1 D2 = D3 = D4 D5 Min 0.1 0 Typ Max 1.0 Unit mm mm mm 1 The distance is dependent on the application and the position of the switches relative to each other and with respect to the user’s finger position and handling. Adjacent sensors with no space between them are implemented differentially. 2 The 1.0 mm specification is intended to prevent direct sensor board contact with any conductive material. This specification, however, does not guarantee an absence of EMI coupling from the controller board to the sensors. To avoid potential EMI-coupling issues, place a grounded metal shield between the capacitive sensor board and the main controller board, as shown in Figure 58. CAPACITIVE SENSOR BOARD D5 METAL OBJECT CAPACITIVE SENSOR PRINTED CIRCUIT 8-WAY SWITCH CONTROLLER PRINTED CIRCUIT BOARD OR METAL CASING 06663-055 GROUNDED METAL SHIELD Figure 58. Capacitive Sensor Board with Grounded Shield CHIP SCALE PACKAGES D4 SLIDER BUTTONS The lands on the chip scale package (CP-24-3) are rectangular. The PCB pad for these should be 0.1 mm longer than the package land length and 0.05 mm wider than the package land width. Center the land on the pad to maximize the solder joint size. D3 D2 06663-053 D1 Figure 56. Capacitive Sensor Board, Top View CAPACITIVE SENSOR BOARD CONTROLLER PRINTED CIRCUIT BOARD OR METAL CASING Thermal vias can be used on the PCB thermal pad to improve the thermal performance of the package. If vias are used, they should be incorporated in the thermal pad at a 1.2 mm pitch grid. The via diameter should be between 0.3 mm and 0.33 mm, and the via barrel should be plated with 1 oz copper to plug the via. Connect the PCB thermal pad to GND. 06663-054 D5 The bottom of the chip scale package has a central thermal pad. The thermal pad on the printed circuit board should be at least as large as this exposed pad. To avoid shorting, provide a clearance of at least 0.25 mm between the thermal pad and the inner edges of the land pattern on the PCB. Figure 57. Capacitive Sensor Board, Side View Rev. E | Page 39 of 70 AD7147 Data Sheet POWER-UP SEQUENCE To power up the AD7147, use the following sequence when initially developing the AD7147 and microprocessor serial interface: Address 0x004 = 832 1. Turn on the power supplies to the AD7147. 2. Write to the Bank 2 registers at Address 0x080 through Address 0x0DF. These registers are contiguous; therefore, a sequential register write sequence can be applied. Address 0x006 = interrupt enable register (depends on required interrupt behavior) Address 0x005 = interrupt enable register (depends on required interrupt behavior) Address 0x007 = interrupt enable register (depends on required interrupt behavior) Note that the Bank 2 register values are unique for each application. Register values come from characterization of the sensor in the application. 3. Write to the Bank 1 registers at Address 0x000 through Address 0x007, outlined as follows. These registers are contiguous; therefore, a sequential register write sequence can be applied (see Figure 50 and Figure 55). 4. Write to the Bank 1 register, Address 0x001 = 0x0FFF (depends on number of conversion stages used). 5. Read back the corresponding interrupt status register at Address 0x008, Address 0x009, or Address 0x00A. This is determined by the interrupt output configuration, as explained in the Interrupt Output section. Note that the specific registers required to be read back depend on each application. For buttons, the interrupt status registers are read back while other sensors read data back from the AD7147 according to the slider or wheel algorithm’s requirements. Analog Devices can provide this information after the user develops the sensor board. Caution: At this time, Address 0x001 must remain set to a default value of 0x0000 during this contiguous write operation. Register values: Address 0x000 = 0x82B2 6. Address 0x001 = 0x000 Repeat Step 5 every time INT is asserted. Address 0x002 = 0x3230 (depends on number of conversion stages used) Address 0x003 = 0x419 POWER HOST SERIAL INTERFACE CONVERSION STAGES DISABLED 0 1 2 3 4 5 6 7 8 9 10 11 0 1 2 9 10 11 0 1 2 9 10 AD7147 INT FIRST CONVERSION SEQUENCE SECOND CONVERSION SEQUENCE Figure 59. Recommended Start-Up Sequence Rev. E | Page 40 of 70 THIRD CONVERSION SEQUENCE 11 0 1 06663-056 CONVERSION STAGE Data Sheet AD7147 19 CIN0 CIN11 7 SENSOR PCB SDO 17 HOST WITH SPI INTERFACE INT 16 SS 15 SCK 14 MOSI 13 MISO VHOST 100nF PLANE AROUND SENSORS CONNECTED TO AC SHIELD 2.2kΩ VCC 2.7V TO 3.6V 0.1μF 1μF TO 10μF (OPTIONAL) 1.8V 06663-057 20 CIN1 21 CIN2 22 CIN3 23 SDI CIN12 BUTTON SCLK CIN10 VDRIVE 6 CIN9 18 12 5 CS AD7147 VCC BUTTON CIN8 11 4 GND 3 INT BIAS SCROLL WHEEL CIN7 9 2 10 BUTTON GPIO ACSHIELD BUTTON VDRIVE CIN6 8 1 CIN4 CIN5 24 TYPICAL APPLICATION CIRCUITS Figure 60. Typical Application Circuit with SPI Interface VDRIVE 19 SDA 17 2.2kΩ HOST WITH I2C INTERFACE INT 16 15 SCK 14 13 SDO 12 VCC VDRIVE ADD0 11 CIN11 18 100nF 0.1μF VCC 2.7V TO 3.6V 1μF TO 10μF (OPTIONAL) Figure 61. Typical Application Circuit with I2C Interface Rev. E | Page 41 of 70 06663-058 20 CIN1 21 CIN2 22 23 CIN3 CIN0 SCLK CIN10 7 2-WAY SWITCH AD7147-1 CIN9 CIN12 6 ADD1 GND 5 CIN8 10 BUTTON INT BIAS 4 CIN7 ACSHIELD 3 2.2kΩ GPIO 9 BUTTON VDRIVE 2.2kΩ CIN6 8 2 SLIDER CONNECT PLANE AROUND SENSORS TO ACSHIELD BUTTON 1 CIN4 CIN5 24 VDRIVE AD7147 Data Sheet REGISTER MAP The AD7147 address space is divided into three register banks, referred to as Bank 1, Bank 2, and Bank 3. Figure 62 illustrates the division of these banks. Bank 1 registers contain control registers, CDC conversion control registers, interrupt enable registers, interrupt status registers, CDC 16-bit conversion data registers, device ID registers, and proximity status registers. Bank 2 registers contain the configuration registers used to configure the individual CINx inputs for each conversion stage. Initialize the Bank 2 configuration registers immediately after power-up to obtain valid CDC conversion result data. BANK 2 REGISTERS ADDR 0x080 SETUP CONTROL (1 REGISTER) ADDR 0x088 ADDR 0x001 INTERRUPT ENABLE (3 REGISTERS) ADDR 0x0A0 ADDR 0x008 ADDR 0x017 96 REGISTERS 26 REGISTERS ADDR 0x098 CDC 16-BIT CONVERSION DATA (12 REGISTERS) ADDR 0x088 STAGE2 CONFIGURATION (8 REGISTERS) STAGE4 CONFIGURATION (8 REGISTERS) STAGE5 CONFIGURATION (8 REGISTERS) ADDR 0x0B0 STAGE6 CONFIGURATION (8 REGISTERS) DEVICE ID REGISTER (1 REGISTER) ADDR 0x098 STAGE3 CONFIGURATION (8 REGISTERS) ADDR 0x0A8 ADDR 0x0B8 ADDR 0x090 STAGE7 CONFIGURATION (8 REGISTERS) ADDR 0x018 PROXIMITY STATUS REGISTER (1 REGISTER) STAGE5 RESULTS (36 REGISTERS) ADDR 0x0B0 ADDR 0x0B8 STAGE6 RESULTS (36 REGISTERS) STAGE7 RESULTS (36 REGISTERS) STAGE8 RESULTS (36 REGISTERS) STAGE9 RESULTS (36 REGISTERS) STAGE9 CONFIGURATION (8 REGISTERS) ADDR 0x0D0 STAGE10 RESULTS (36 REGISTERS) STAGE10 CONFIGURATION (8 REGISTERS) INVALID DO NOT ACCESS STAGE4 RESULTS (36 REGISTERS) ADDR 0x0C8 ADDR 0x0C8 ADDR 0x0D0 ADDR 0x043 STAGE2 RESULTS (36 REGISTERS) ADDR 0x0A8 STAGE8 CONFIGURATION (8 REGISTERS) INVALID DO NOT ACCESS STAGE1 RESULTS (36 REGISTERS) ADDR 0x0C0 ADDR 0x0C0 ADDR 0x042 STAGE0 RESULTS (36 REGISTERS) STAGE3 RESULTS (36 REGISTERS) ADDR 0x0A0 432 REGISTERS ADDR 0x090 ADDR 0x005 ADDR 0x00B BANK 3 REGISTERS ADDR 0x0E0 STAGE0 CONFIGURATION (8 REGISTERS) STAGE1 CONFIGURATION (8 REGISTERS) CALIBRATION AND SETUP (4 REGISTERS) INTERRUPT STATUS (3 REGISTERS) Default values are undefined for Bank 2 registers and Bank 3 registers until after power-up and configuration of the Bank 2 registers. ADDR 0x0D8 ADDR 0x28F STAGE11 CONFIGURATION (8 REGISTERS) ADDR 0x7F0 Figure 62. Layout of Bank 1, Bank 2, and Bank 3 Registers Rev. E | Page 42 of 70 STAGE11 RESULTS (36 REGISTERS) 06663-059 BANK 1 REGISTERS ADDR 0x000 Bank 3 registers contain the results of each conversion stage. These registers automatically update at the end of each conversion sequence. Although these registers are primarily used by the AD7147 internal data processing, they are accessible by the host processor for additional external data processing, if desired. Data Sheet AD7147 DETAILED REGISTER DESCRIPTIONS BANK 1 REGISTERS All addresses and default values are expressed in hexadecimal. Table 20. PWR_CONTROL Register Address 0x000 Data Bit [1:0] Default Value 0 Type R/W Name POWER_MODE [3:2] 0 R/W LP_CONV_DELAY [7:4] 0 R/W SEQUENCE_STAGE_NUM [9:8] 0 R/W DECIMATION [10] 0 R/W SW_RESET [11] 0 R/W INT_POL [12] 0 R/W EXT_SOURCE [13] [15:14] 0 0 R/W Unused CDC_BIAS Rev. E | Page 43 of 70 Description Operating modes 00 = full power mode (normal operation, CDC conversions approximately every 36 ms) 01 = full shutdown mode (no CDC conversions) 10 = low power mode (automatic wake-up operation) 11 = full shutdown mode (no CDC conversions) Low power mode conversion delay 00 = 200 ms 01 = 400 ms 10 = 600 ms 11 = 800 ms Number of stages in sequence (N + 1) 0000 = 1 conversion stage in sequence 0001 = 2 conversion stages in sequence … Maximum value = 1011 = 12 conversion stages per sequence ADC decimation factor 00 = decimate by 256 01 = decimate by 128 10 = decimate by 64 11 = decimate by 64 Software reset control (self-clearing) 1 = resets all registers to default values Interrupt polarity control 0 = active low 1 = active high Excitation source control 0 = enable excitation source to CINx pins 1 = disable excitation source to CINx pins Set to 0 CDC bias current control 00 = normal operation 01 = normal operation + 20% 10 = normal operation + 35% 11 = normal operation + 50% AD7147 Data Sheet Table 21. STAGE_CAL_EN Register Address 0x001 Data Bit [0] Default Value 0 Type R/W Name STAGE0_CAL_EN [1] 0 R/W STAGE1_CAL_EN [2] 0 R/W STAGE2_CAL_EN [3] 0 R/W STAGE3_CAL_EN [4] 0 R/W STAGE4_CAL_EN [5] 0 R/W STAGE5_CAL_EN [6] 0 R/W STAGE6_CAL_EN [7] 0 R/W STAGE7_CAL_EN [8] 0 R/W STAGE8_CAL_EN [9] 0 R/W STAGE9_CAL_EN [10] 0 R/W STAGE10_CAL_EN [11] 0 R/W STAGE11_CAL_EN [13:12] 0 R/W AVG_FP_SKIP [15:14] 0 R/W AVG_LP_SKIP Rev. E | Page 44 of 70 Description STAGE0 calibration enable 0 = disable 1 = enable STAGE1 calibration enable 0 = disable 1 = enable STAGE2 calibration enable 0 = disable 1 = enable STAGE3 calibration enable 0 = disable 1 = enable STAGE4 calibration enable 0 = disable 1 = enable STAGE5 calibration enable 0 = disable 1 = enable STAGE6 calibration enable 0 = disable 1 = enable STAGE7 calibration enable 0 = disable 1 = enable STAGE8 calibration enable 0 = disable 1 = enable STAGE9 calibration enable 0 = disable 1 = enable STAGE10 calibration enable 0 = disable 1 = enable STAGE11 calibration enable 0 = disable 1 = enable Full power mode skip control 00 = skip 3 samples 01 = skip 7 samples 10 = skip 15 samples 11 = skip 31 samples Low power mode skip control 00 = use all samples 01 = skip one sample 10 = skip two samples 11 = skip three samples Data Sheet AD7147 Table 22. AMB_COMP_CTRL0 Register Address 0x002 Data Bit [3:0] Default Value 0 Type R/W Name FF_SKIP_CNT [7:4] F R/W FP_PROXIMITY_CNT [11:8] F R/W LP_PROXIMITY_CNT [13:12] 0 R/W PWR_DOWN_TIMEOUT [14] 0 R/W FORCED_CAL [15] 0 R/W CONV_RESET Description Fast filter skip control (N + 1) 0000 = no sequence of results is skipped 0001 = one sequence of results is skipped for every one allowed into fast FIFO 0010 = two sequences of results are skipped for every one allowed into fast FIFO 1011 = maximum value = 12 sequences of results are skipped for every one allowed into fast FIFO Calibration disable period in full power mode = FP_PROXIMITY_CNT × 16 × time for one conversion sequence in full power mode Calibration disable period in low power mode = LP_PROXIMITY_CNT × 4 × time for one conversion sequence in low power mode Full power to low power mode timeout control 00 = 1.25 × (FP_PROXIMITY_CNT) 01 = 1.50 × (FP_PROXIMITY_CNT) 10 = 1.75 × (FP_PROXIMITY_CNT) 11 = 2.00 × (FP_PROXIMITY_CNT) Forced calibration control 0 = normal operation 1 = forces all conversion stages to recalibrate Conversion reset control (self-clearing) 0 = normal operation 1 = resets the conversion sequence to STAGE0 Table 23. AMB_COMP_CTRL1 Register Address 0x003 Data Bit [7:0] Default Value 64 Type R/W Name PROXIMITY_RECAL_LVL [13:8] 1 R/W PROXIMITY_DETECTION_RATE [15:14] 0 R/W SLOW_FILTER_UPDATE_LVL Description Proximity recalibration level; the value is multiplied by 16 to determine actual recalibration level Proximity detection rate; the value is multiplied by 16 to determine actual detection rate Slow filter update level Name FP_PROXIMITY_RECAL LP_PROXIMITY_RECAL Description Full power mode proximity recalibration time control Low power mode proximity recalibration time control Table 24. AMB_COMP_CTRL2 Register Address 0x004 Data Bit [9:0] [15:10] Default Value 3FF 3F Type R/W R/W Rev. E | Page 45 of 70 AD7147 Data Sheet Table 25. STAGE_LOW_INT_ENABLE Register Address 0x005 Data Bit [0] Default Value 0 Type R/W Name STAGE0_LOW_INT_ENABLE [1] 0 R/W STAGE1_LOW_INT_ENABLE [2] 0 R/W STAGE2_LOW_INT_ENABLE [3] 0 R/W STAGE3_LOW_INT_ENABLE [4] 0 R/W STAGE4_LOW_INT_ENABLE [5] 0 R/W STAGE5_LOW_INT_ENABLE [6] 0 R/W STAGE6_LOW_INT_ENABLE [7] 0 R/W STAGE7_LOW_INT_ENABLE [8] 0 R/W STAGE8_LOW_INT_ENABLE [9] 0 R/W STAGE9_LOW_INT_ENABLE [10] 0 R/W STAGE10_LOW_INT_ENABLE [11] 0 R/W STAGE11_LOW_INT_ENABLE [13:12] 0 R/W GPIO_SETUP [15:14] 0 R/W GPIO_INPUT_CONFIG Rev. E | Page 46 of 70 Description STAGE0 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE0 low threshold is exceeded STAGE1 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE1 low threshold is exceeded STAGE2 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE2 low threshold is exceeded STAGE3 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE3 low threshold is exceeded STAGE4 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE4 low threshold is exceeded STAGE5 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE5 low threshold is exceeded STAGE6 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE6 low threshold is exceeded STAGE7 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE7 low threshold is exceeded STAGE8 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE8 low threshold is exceeded STAGE9 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE9 low threshold is exceeded STAGE10 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE10 low threshold is exceeded STAGE11 low interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE11 low threshold is exceeded GPIO setup 00 = disable GPIO pin 01 = configure GPIO as an input 10 = configure GPIO as an active low output 11 = configure GPIO as an active high output GPIO input configuration 00 = triggered on negative level 01 = triggered on positive edge 10 = triggered on negative edge 11 = triggered on positive level Data Sheet AD7147 Table 26. STAGE_HIGH_INT_ENABLE Register Address 0x006 Data Bit [0] Default Value 0 Type R/W Name STAGE0_HIGH_INT_ENABLE [1] 0 R/W STAGE1_HIGH_INT_ENABLE [2] 0 R/W STAGE2_HIGH_INT_ENABLE [3] 0 R/W STAGE3_HIGH_INT_ENABLE [4] 0 R/W STAGE4_HIGH_INT_ENABLE [5] 0 R/W STAGE5_HIGH_INT_ENABLE [6] 0 R/W STAGE6_HIGH_INT_ENABLE [7] 0 R/W STAGE7_HIGH_INT_ENABLE [8] 0 R/W STAGE8_HIGH_INT_ENABLE [9] 0 R/W STAGE9_HIGH_INT_ENABLE [10] 0 R/W STAGE10_HIGH_INT_ENABLE [11] 0 R/W STAGE11_HIGH_INT_ENABLE [15:12] Unused Rev. E | Page 47 of 70 Description STAGE0 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE0 high threshold is exceeded STAGE1 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE1 high threshold is exceeded STAGE2 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE2 high threshold is exceeded STAGE3 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE3 high threshold is exceeded STAGE4 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE4 high threshold is exceeded STAGE5 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE5 high threshold is exceeded STAGE6 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE6 high threshold is exceeded STAGE7 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE7 high threshold is exceeded STAGE8 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE8 high threshold is exceeded STAGE9 sensor high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE9 high threshold is exceeded STAGE10 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE10 high threshold is exceeded STAGE11 high interrupt enable 0 = interrupt source disabled 1 = INT asserted if STAGE11 high threshold is exceeded Set to 0 AD7147 Data Sheet Table 27. STAGE_COMPLETE_INT_ENABLE Register Address 0x007 Data Bit [0] Default Value 0 Type R/W Name STAGE0_COMPLETE_INT_ENABLE [1] 0 R/W STAGE1_COMPLETE_INT_ENABLE [2] 0 R/W STAGE2_COMPLETE_INT_ENABLE [3] 0 R/W STAGE3_COMPLETE_INT_ENABLE [4] 0 R/W STAGE4_COMPLETE_INT_ENABLE [5] 0 R/W STAGE5_COMPLETE_INT_ENABLE [6] 0 R/W STAGE6_COMPLETE_INT_ENABLE [7] 0 R/W STAGE7_COMPLETE_INT_ENABLE [8] 0 R/W STAGE8_COMPLETE_INT_ENABLE [9] 0 R/W STAGE9_COMPLETE_INT_ENABLE [10] 0 R/W STAGE10_COMPLETE_INT_ENABLE [11] 0 R/W STAGE11_COMPLETE_INT_ENABLE [12] 0 R/W GPIO_INT_ENABLE [15:13] Unused Rev. E | Page 48 of 70 Description STAGE0 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE0 conversion STAGE1 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE1 conversion STAGE2 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE2 conversion STAGE3 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE3 conversion STAGE4 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE4 conversion STAGE5 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE5 conversion STAGE6 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE6 conversion STAGE7 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE7 conversion STAGE8 conversion complete interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE8 conversion STAGE9 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE9 conversion STAGE10 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE10 conversion STAGE11 conversion interrupt control 0 = interrupt source disabled 1 = INT asserted at completion of STAGE11 conversion Interrupt control when GPIO input pin changes level 0 = disabled 1 = enabled Set to 0 Data Sheet AD7147 Table 28. STAGE_LOW_INT_STATUS Register1 Address 0x008 Data Bit [0] Default Value 0 Type R Name STAGE0_LOW_INT_STATUS [1] 0 R STAGE1_LOW_INT_STATUS [2] 0 R STAGE2_LOW_INT_STATUS [3] 0 R STAGE3_LOW_INT_STATUS [4] 0 R STAGE4_LOW_INT_STATUS [5] 0 R STAGE5_LOW_INT_STATUS [6] 0 R STAGE6_LOW_INT_STATUS [7] 0 R STAGE7_LOW_INT_STATUS [8] 0 R STAGE8_LOW_INT_STATUS [9] 0 R STAGE9_LOW_INT_STATUS [10] 0 R STAGE10_LOW_INT_STATUS [11] 0 R STAGE11_LOW_INT_STATUS [15:12] 1 Unused Registers self-clear to 0 after readback if the limits are not exceeded. Rev. E | Page 49 of 70 Description STAGE0 CDC conversion low limit interrupt result 1 = indicates STAGE0_LOW_THRESHOLD value was exceeded STAGE1 CDC conversion low limit interrupt result 1 = indicates STAGE1_LOW_THRESHOLD value was exceeded STAGE2 CDC conversion low limit interrupt result 1 = indicates STAGE2_LOW_THRESHOLD value was exceeded STAGE3 CDC conversion low limit interrupt result 1 = indicates STAGE3_LOW_THRESHOLD value was exceeded STAGE4 CDC conversion low limit interrupt result 1 = indicates STAGE4_LOW_THRESHOLD value was exceeded STAGE5 CDC conversion low limit interrupt result 1 = indicates STAGE5_LOW_THRESHOLD value was exceeded STAGE6 CDC conversion low limit interrupt result 1 = indicates STAGE6_LOW_THRESHOLD value was exceeded STAGE7 CDC conversion low limit interrupt result 1 = indicates STAGE7_LOW_THRESHOLD value was exceeded STAGE8 CDC conversion low limit interrupt result 1 = indicates STAGE8_LOW_THRESHOLD value was exceeded STAGE9 CDC conversion low limit interrupt result 1 = indicates STAGE9_LOW_THRESHOLD value was exceeded STAGE10 CDC Conversion Low Limit Interrupt result 1 = indicates STAGE10_LOW_THRESHOLD value was exceeded STAGE11 CDC conversion low limit interrupt result 1 = indicates STAGE11_LOW_THRESHOLD value was exceeded Set to 0 AD7147 Data Sheet Table 29. STAGE_HIGH_INT_STATUS Register1 Address 0x009 Data Bit [0] Default Value 0 Type R Name STAGE0_HIGH_INT_STATUS [1] 0 R STAGE1_HIGH_INT_STATUS [2] 0 R STAGE2_HIGH_INT_STATUS [3] 0 R STAGE3_HIGH_INT_STATUS [4] 0 R STAGE4_HIGH_INT_STATUS [5] 0 R STAGE5_HIGH_INT_STATUS [6] 0 R STAGE6_HIGH_INT_STATUS [7] 0 R STAGE7_HIGH_INT_STATUS [8] 0 R STAGE8_HIGH_INT_STATUS [9] 0 R STAGE9_HIGH_INT_STATUS [10] 0 R STAGE10_HIGH_INT_STATUS [11] 0 R STAGE11_HIGH_INT_STATUS [15:12] 1 Unused Registers self-clear to 0 after readback if the limits are not exceeded. Rev. E | Page 50 of 70 Description STAGE0 CDC conversion high limit interrupt result 1 = indicates STAGE0_HIGH_THRESHOLD value was exceeded STAGE1 CDC conversion high limit interrupt result 1 = indicates STAGE1_HIGH_THRESHOLD value was exceeded Stage2 CDC conversion high limit interrupt result 1 = indicates STAGE2_HIGH_THRESHOLD value was exceeded STAGE3 CDC conversion high limit interrupt result 1 = indicates STAGE3_HIGH_THRESHOLD value was exceeded STAGE4 CDC conversion high limit interrupt result 1 = indicates STAGE4_HIGH_THRESHOLD value was exceeded STAGE5 CDC conversion high limit interrupt result 1 = indicates STAGE5_HIGH_THRESHOLD value was exceeded STAGE6 CDC conversion high limit interrupt result 1 = indicates STAGE6_HIGH_THRESHOLD value was exceeded STAGE7 CDC conversion high limit interrupt result 1 = indicates STAGE7_HIGH_THRESHOLD value was exceeded STAGE8 CDC conversion high limit interrupt result 1 = indicates STAGE8_HIGH_THRESHOLD value was exceeded STAGE9 CDC conversion high limit interrupt result 1 = indicates STAGE9_HIGH_THRESHOLD value was exceeded STAGE10 CDC conversion high limit interrupt result 1 = indicates STAGE10_HIGH_THRESHOLD value was exceeded STAGE11 CDC conversion high limit interrupt result 1 = indicates STAGE11_HIGH_THRESHOLD value was exceeded Set to 0 Data Sheet AD7147 Table 30. STAGE_COMPLETE_INT_STATUS Register1 Address 0x00A Data Bit [0] Default Value 0 Type R Name STAGE0_COMPLETE_INT_STATUS [1] 0 R STAGE1_COMPLETE_INT_STATUS [2] 0 R STAGE2_COMPLETE_INT_STATUS [3] 0 R STAGE3_COMPLETE_INT_STATUS [4] 0 R STAGE4_COMPLETE_INT_STATUS [5] 0 R STAGE5_COMPLETE_INT_STATUS [6] 0 R STAGE6_COMPLETE_INT_STATUS [7] 0 R STAGE7_COMPLETE_INT_STATUS [8] 0 R STAGE8_COMPLETE_INT_STATUS [9] 0 R STAGE9_COMPLETE_INT_STATUS [10] 0 R STAGE10_COMPLETE_INT_STATUS [11] 0 R STAGE11_COMPLETE_INT_STATUS [12] 0 R GPIO_INT_STATUS [15:13] 1 Unused Description STAGE0 conversion complete register interrupt status 1 = indicates STAGE0 conversion completed STAGE1 conversion complete register interrupt status 1 = indicates STAGE1 conversion completed STAGE2 conversion complete register interrupt status 1 = indicates STAGE2 conversion completed STAGE3 conversion complete register interrupt status 1 = indicates STAGE3 conversion completed STAGE4 conversion complete register interrupt status 1 = indicates STAGE4 conversion completed STAGE5 conversion complete register interrupt status 1 = indicates STAGE5 conversion completed STAGE6 conversion complete register interrupt status 1 = indicates STAGE6 conversion completed STAGE7 conversion complete register interrupt status 1 = indicates STAGE7 conversion completed STAGE8 conversion complete register interrupt status 1 = indicates STAGE8 conversion completed STAGE9 conversion complete register interrupt status 1 = indicates STAGE9 conversion completed STAGE10 conversion complete register interrupt status 1 = indicates STAGE10 conversion completed STAGE11 conversion complete register interrupt status 1 = indicates STAGE11 conversion completed GPIO input pin status 1 = indicates level on GPIO pin has changed Set to 0 Registers self-clear to 0 after readback if the limits are not exceeded. Table 31. CDC 16-Bit Conversion Data Registers Address 0x00B 0x00C 0x00D 0x00E 0x00F 0x010 0x011 0x012 0x013 0x014 0x015 0x016 Data Bit [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] Default Value 0 0 0 0 0 0 0 0 0 0 0 0 Type R R R R R R R R R R R R Name CDC_RESULT_S0 CDC_RESULT_S1 CDC_RESULT_S2 CDC_RESULT_S3 CDC_RESULT_S4 CDC_RESULT_S5 CDC_RESULT_S6 CDC_RESULT_S7 CDC_RESULT_S8 CDC_RESULT_S9 CDC_RESULT_S10 CDC_RESULT_S11 Rev. E | Page 51 of 70 Description STAGE0 CDC 16-bit conversion data STAGE1 CDC 16-bit conversion data STAGE2 CDC 16-bit conversion data STAGE3 CDC 16-bit conversion data STAGE4 CDC 16-bit conversion data STAGE5 CDC 16-bit conversion data STAGE6 CDC 16-bit conversion data STAGE7 CDC 16-bit conversion data STAGE8 CDC 16-bit conversion data STAGE9 CDC 16-bit conversion data STAGE10 CDC 16-bit conversion data STAGE11 CDC 16-bit conversion data AD7147 Data Sheet Table 32. Device ID Register Address 0x017 Data Bit [3:0] [15:4] Default Value 0 147 Type R R Name REVISION_CODE DEVID Description Revision code Device ID = 0001 0100 0111 Description STAGE0 proximity status register 1 = indicates proximity has been detected on STAGE0 STAGE1 proximity status register 1 = indicates proximity has been detected on STAGE1 STAGE2 proximity status register 1 = indicates proximity has been detected on STAGE2 STAGE3 proximity status register 1 = indicates proximity has been detected on STAGE3 STAGE4 proximity status register 1 = indicates proximity has been detected on STAGE4 STAGE5 proximity status register 1 = indicates proximity has been detected on STAGE5 STAGE6 proximity status register 1 = indicates proximity has been detected on STAGE6 STAGE7 proximity status register 1 = indicates proximity has been detected on STAGE7 STAGE8 proximity status register 1 = indicates proximity has been detected on STAGE8 STAGE9 proximity status register 1 = indicates proximity has been detected on STAGE9 STAGE10 proximity status register 1 = indicates proximity has been detected on STAGE10 STAGE11 proximity status register 1 = indicates proximity has been detected on STAGE11 Set to 0 Table 33. Proximity Status Register Address 0x042 Data Bit [0] Default Value 0 Type R Name STAGE0_PROXIMITY_STATUS [1] 0 R STAGE1_PROXIMITY_STATUS [2] 0 R STAGE2_PROXIMITY_STATUS [3] 0 R STAGE3_PROXIMITY_STATUS [4] 0 R STAGE4_PROXIMITY_STATUS [5] 0 R STAGE5_PROXIMITY_STATUS [6] 0 R STAGE6_PROXIMITY_STATUS [7] 0 R STAGE7_PROXIMITY_STATUS [8] 0 R STAGE8_PROXIMITY_STATUS [9] 0 R STAGE9_PROXIMITY_STATUS [10] 0 R STAGE10_PROXIMITY_STATUS [11] 0 R STAGE11_PROXIMITY_STATUS [15:12] Unused Rev. E | Page 52 of 70 Data Sheet AD7147 BANK 2 REGISTERS All address values are expressed in hexadecimal. Table 34. STAGEx_CONNECTION[6:0] Register Description (x = 0 to 11) Data Bit [1:0] Default Value X Type R/W Name CIN0_CONNECTION_SETUP [3:2] X R/W CIN1_CONNECTION_SETUP [5:4] X R/W CIN2_CONNECTION_SETUP [7:6] X R/W CIN3_CONNECTION_SETUP [9:8] X R/W CIN4_CONNECTION_SETUP [11:10] X R/W CIN5_CONNECTION_SETUP [13:12] X R/W CIN6_CONNECTION_SETUP [15:14] X Unused Description CIN0 connection setup 00 = CIN0 not connected to CDC inputs 01 = CIN0 connected to CDC negative input 10 = CIN0 connected to CDC positive input 11 = CIN0 connected to BIAS (connect unused CINx inputs) CIN1 connection setup 00 = CIN1 not connected to CDC inputs 01 = CIN1 connected to CDC negative input 10 = CIN1 connected to CDC positive input 11 = CIN1 connected to BIAS (connect unused CINx inputs) CIN2 connection setup 00 = CIN2 not connected to CDC inputs 01 = CIN2 connected to CDC negative input 10 = CIN2 connected to CDC positive input 11 = CIN2 connected to BIAS (connect unused CINx inputs) CIN3 connection setup 00 = CIN3 not connected to CDC inputs 01 = CIN3 connected to CDC negative input 10 = CIN3 connected to CDC positive input 11 = CIN3 connected to BIAS (connect unused CINx inputs) CIN4 connection setup 00 = CIN4 not connected to CDC inputs 01 = CIN4 connected to CDC negative input 10 = CIN4 connected to CDC positive input 11 = CIN4 connected to BIAS (connect unused CINx inputs) CIN5 connection setup 00 = CIN5 not connected to CDC inputs 01 = CIN5 connected to CDC negative input 10 = CIN5 connected to CDC positive input 11 = CIN5 connected to BIAS (connect unused CINx inputs) CIN6 connection setup 00 = CIN6 not connected to CDC inputs 01 = CIN6 connected to CDC negative input 10 = CIN6 connected to CDC positive input 11 = CIN6 connected to BIAS (connect unused CINx inputs) Set to 0 Rev. E | Page 53 of 70 AD7147 Data Sheet Table 35. STAGEx_CONNECTION[12:7] Register Description (x = 0 to 11) Data Bit [1:0] Default Value X Type R/W Name CIN7_CONNECTION_SETUP [3:2] X R/W CIN8_CONNECTION_SETUP [5:4] X R/W CIN9_CONNECTION_SETUP [7:6] X R/W CIN10_CONNECTION_SETUP [9:8] X R/W CIN11_CONNECTION_SETUP [11:10] X R/W CIN12_CONNECTION_SETUP [13:12] X R/W SE_CONNECTION_SETUP [14] X R/W NEG_AFE_OFFSET_DISABLE [15] X R/W POS_AFE_OFFSET_DISABLE Description CIN7 connection setup 00 = CIN7 not connected to CDC inputs 01 = CIN7 connected to CDC negative input 10 = CIN7 connected to CDC positive input 11 = CIN7 connected to BIAS (connect unused CINx inputs) CIN8 connection setup 00 = CIN8 not connected to CDC inputs 01 = CIN8 connected to CDC negative input 10 = CIN8 connected to CDC positive input 11 = CIN8 connected to BIAS (connect unused CINx inputs) CIN9 connection setup 00 = CIN9 not connected to CDC inputs 01 = CIN9 connected to CDC negative input 10 = CIN9 connected to CDC positive input 11 = CIN9 connected to BIAS (connect unused CINx inputs) CIN10 connection setup 00 = CIN10 not connected to CDC inputs 01 = CIN10 connected to CDC negative input 10 = CIN10 connected to CDC positive input 11 = CIN10 connected to BIAS (connect unused CINx inputs) CIN11 connection setup 00 = CIN11 not connected to CDC inputs 01 = CIN11 connected to CDC negative input 10 = CIN11 connected to CDC positive input 11 = CIN11 connected to BIAS (connect unused CINx inputs) CIN12 connection setup 00 = CIN12 not connected to CDC inputs 01 = CIN12 connected to CDC negative input 10 = CIN12 connected to CDC positive input 11 = CIN12 connected to BIAS (connect unused CINx inputs) Single-ended measurement connection setup 00 = do not use 01 = use when one CINx connected to CDC positive input, single-ended measurements only 10 = use when one CINx connected to CDC negative input, single-ended measurements only 11 = differential connection to CDC Negative AFE offset enable control 0 = enable 1 = disable Positive AFE offset enable control 0 = enable 1 = disable Rev. E | Page 54 of 70 Data Sheet AD7147 Table 36. STAGEx_AFE_OFFSET Register Description (x = 0 to 11) Data Bit [5:0] Default Value X Type R/W Name NEG_AFE_OFFSET [6] [7] X X R/W Unused NEG_AFE_OFFSET_SWAP [13:8] X R/W POS_AFE_OFFSET [14] [15] X X R/W Unused POS_AFE_OFFSET_SWAP Description Negative AFE offset setting (20 pF range) 1 LSB value = 0.32 pF of offset Set to 0 Negative AFE offset swap control 0 = NEG_AFE_OFFSET applied to CDC negative input 1 = NEG_AFE_OFFSET applied to CDC positive input Positive AFE offset setting (20 pF range) 1 LSB value = 0.32 pF of offset Set to 0 Positive AFE offset swap control 0 = POS_AFE_OFFSET applied to CDC positive input 1 = POS_AFE_OFFSET applied to CDC negative input Table 37. STAGEx_SENSITIVITY Register Description (x = 0 to 11) Data Bit [3:0] Default Value X Type R/W Name NEG_THRESHOLD_SENSITIVITY [6:4] X R/W NEG_PEAK_DETECT [7] [11:8] X X R/W R/W Unused POS_THRESHOLD_SENSITIVITY [14:12] X R/W POS_PEAK_DETECT [15] X R/W Unused Description Negative threshold sensitivity control 0000 = 25%, 0001 = 29.73%, 0010 = 34.40%, 0011 = 39.08% 0100 = 43.79%, 0101 = 48.47%, 0110 = 53.15% 0111 = 57.83%, 1000 = 62.51%, 1001 = 67.22% 1010 = 71.90%, 1011 = 76.58%, 1100 = 81.28% 1101 = 85.96%, 1110 = 90.64%, 1111 = 95.32% Negative peak detect setting 000 = 40% level, 001 = 50% level, 010 = 60% level 011 = 70% level, 100 = 80% level, 101 = 90% level Set to 0 Positive threshold sensitivity control 0000 = 25%, 0001 = 29.73%, 0010 = 34.40%, 0011 = 39.08% 0100 = 43.79%, 0101 = 48.47%, 0110 = 53.15% 0111 = 57.83%, 1000 = 62.51%, 1001 = 67.22% 1010 = 71.90%, 1011 = 76.58%, 1100 = 81.28% 1101 = 85.96%, 1110 = 90.64%, 1111 = 95.32% Positive peak detect setting 000 = 40% level, 001 = 50% level, 010 = 60% level 011 = 70% level, 100 = 80% level, 101 = 90% level Set to 0 Rev. E | Page 55 of 70 AD7147 Data Sheet Table 38. STAGE0 to STAGE11 Configuration Registers Address 0x080 0x081 0x082 0x083 0x084 0x085 0x086 0x087 0x088 0x089 0x08A 0x08B 0x08C 0x08D 0x08E 0x08F 0x090 0x091 0x092 0x093 0x094 0x095 0x096 0x097 0x098 0x099 0x09A 0x09B 0x09C 0x09D 0x09E 0x09F 0x0A0 0x0A1 0x0A2 0x0A3 0x0A4 0x0A5 0x0A6 0x0A7 0x0A8 0x0A9 0x0AA 0x0AB 0x0AC 0x0AD 0x0AE 0x0AF Data Bit [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] Default X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Type R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Name STAGE0_CONNECTION[6:0] STAGE0_CONNECTION[12:7] STAGE0_AFE_OFFSET STAGE0_SENSITIVITY STAGE0_OFFSET_LOW STAGE0_OFFSET_HIGH STAGE0_OFFSET_HIGH_CLAMP STAGE0_OFFSET_LOW_CLAMP STAGE1_CONNECTION[6:0] STAGE1_CONNECTION[12:7] STAGE1_AFE_OFFSET STAGE1_SENSITIVITY STAGE1_OFFSET_LOW STAGE1_OFFSET_HIGH STAGE1_OFFSET_HIGH_CLAMP STAGE1_OFFSET_LOW_CLAMP STAGE2_CONNECTION[6:0] STAGE2_CONNECTION[12:7] STAGE2_AFE_OFFSET STAGE2_SENSITIVITY STAGE2_OFFSET_LOW STAGE2_OFFSET_HIGH STAGE2_OFFSET_HIGH_CLAMP STAGE2_OFFSET_LOW_CLAMP STAGE3_CONNECTION[6:0] STAGE3_CONNECTION[12:7] STAGE3_AFE_OFFSET STAGE3_SENSITIVITY STAGE3_OFFSET_LOW STAGE3_OFFSET_HIGH STAGE3_OFFSET_HIGH_CLAMP STAGE3_OFFSET_LOW_CLAMP STAGE4_CONNECTION[6:0] STAGE4_CONNECTION[12:7] STAGE4_AFE_OFFSET STAGE4_SENSITIVITY STAGE4_OFFSET_LOW STAGE4_OFFSET_HIGH STAGE4_OFFSET_HIGH_CLAMP STAGE4_OFFSET_LOW_CLAMP STAGE5_CONNECTION[6:0] STAGE5_CONNECTION[12:7] STAGE5_AFE_OFFSET STAGE5_SENSITIVITY STAGE5_OFFSET_LOW STAGE5_OFFSET_HIGH STAGE5_OFFSET_HIGH_CLAMP STAGE5_OFFSET_LOW_CLAMP Rev. E | Page 56 of 70 Description STAGE0 CIN[6:0] connection setup (see Table 34) STAGE0 CIN[12:7] connection setup (see Table 35) STAGE0 AFE offset control (see Table 36) STAGE0 sensitivity control (see Table 37) STAGE0 initial offset low value STAGE0 initial offset high value STAGE0 offset high clamp value STAGE0 offset low clamp value STAGE1 CIN[6:0] connection setup (see Table 34) STAGE1 CIN[12:7] connection setup (see Table 35) STAGE1 AFE offset control (see Table 36) STAGE1 sensitivity control (see Table 37) STAGE1 initial offset low value STAGE1 initial offset high value STAGE1 offset high clamp value STAGE1 offset low clamp value STAGE2 CIN[6:0] connection setup (see Table 34) STAGE2 CIN[12:7] connection setup (see Table 35) STAGE2 AFE offset control (see Table 36) STAGE2 sensitivity control (see Table 37) STAGE2 initial offset low value STAGE2 initial offset high value STAGE2 offset high clamp value STAGE2 offset low clamp value STAGE3 CIN[6:0] connection setup (see Table 34) STAGE3 CIN[12:7] connection setup (see Table 35) STAGE3 AFE offset control (see Table 36) STAGE3 sensitivity control (see Table 37) STAGE3 initial offset low value STAGE3 initial offset high value STAGE3 offset high clamp value STAGE3 offset low clamp value STAGE4 CIN[6:0] connection setup (see Table 34) STAGE4 CIN[12:7] connection setup (see Table 35) STAGE4 AFE offset control (see Table 36) STAGE4 sensitivity control (see Table 37) STAGE4 initial offset low value STAGE4 initial offset high value STAGE4 offset high clamp value STAGE4 offset low clamp value STAGE5 CIN[6:0] connection setup (see Table 34) STAGE5 CIN[12:7] connection setup (see Table 35) STAGE5 AFE offset control (see Table 36) STAGE5 sensitivity control (see Table 37) STAGE5 initial offset low value STAGE5 initial offset high value STAGE5 offset high clamp value STAGE5 offset low clamp value Data Sheet Address 0x0B0 0x0B1 0x0B2 0x0B3 0x0B4 0x0B5 0x0B6 0x0B7 0x0B8 0x0B9 0x0BA 0x0BB 0x0BC 0x0BD 0x0BE 0x0BF 0x0C0 0x0C1 0x0C2 0x0C3 0x0C4 0x0C5 0x0C6 0x0C7 0x0C8 0x0C9 0x0CA 0x0CB 0x0CC 0x0CD 0x0CE 0x0CF 0x0D0 0x0D1 0x0D2 0x0D3 0x0D4 0x0D5 0x0D6 0x0D7 0x0D8 0x0D9 0x0DA 0x0DB 0x0DC 0x0DD 0x0DE 0x0DF Data Bit [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] AD7147 Default X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X Type R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W Name STAGE6_CONNECTION[6:0] STAGE6_CONNECTION[12:7] STAGE6_AFE_OFFSET STAGE6_SENSITIVITY STAGE6_OFFSET_LOW STAGE6_OFFSET_HIGH STAGE6_OFFSET_HIGH_CLAMP STAGE6_OFFSET_LOW_CLAMP STAGE7_CONNECTION[6:0] STAGE7_CONNECTION[12:7] STAGE7_AFE_OFFSET STAGE7_SENSITIVITY STAGE7_OFFSET_LOW STAGE7_OFFSET_HIGH STAGE7_OFFSET_HIGH_CLAMP STAGE7_OFFSET_LOW_CLAMP STAGE8_CONNECTION[6:0] STAGE8_CONNECTION[12:7] STAGE8_AFE_OFFSET STAGE8_SENSITIVITY STAGE8_OFFSET_LOW STAGE8_OFFSET_HIGH STAGE8_OFFSET_HIGH_CLAMP STAGE8_OFFSET_LOW_CLAMP STAGE9_CONNECTION[6:0] STAGE9_CONNECTION[12:7] STAGE9_AFE_OFFSET STAGE9_SENSITIVITY STAGE9_OFFSET_LOW STAGE9_OFFSET_HIGH STAGE9_OFFSET_HIGH_CLAMP STAGE9_OFFSET_LOW_CLAMP STAGE10_CONNECTION[6:0] STAGE10_CONNECTION[12:7] STAGE10_AFE_OFFSET STAGE10_SENSITIVITY STAGE10_OFFSET_LOW STAGE10_OFFSET_HIGH STAGE10_OFFSET_HIGH_CLAMP STAGE10_OFFSET_LOW_CLAMP STAGE11_CONNECTION[6:0] STAGE11_CONNECTION[12:7] STAGE11_AFE_OFFSET STAGE11_SENSITIVITY STAGE11_OFFSET_LOW STAGE11_OFFSET_HIGH STAGE11_OFFSET_HIGH_CLAMP STAGE11_OFFSET_LOW_CLAMP Rev. E | Page 57 of 70 Description STAGE6 CIN[6:0] connection setup (see Table 34) STAGE6 CIN[12:7]connection setup (see Table 35) STAGE6 AFE offset control (see Table 36) STAGE6 sensitivity control (see Table 37) STAGE6 initial offset low value STAGE6 initial offset high value STAGE6 offset high clamp value STAGE6 offset low clamp value STAGE7 CIN[6:0] connection setup (see Table 34) STAGE7 CIN[12:7] connection setup (see Table 35) STAGE7 AFE offset control (see Table 36) STAGE7 sensitivity control (see Table 37) STAGE7 initial offset low value STAGE7 initial offset high value STAGE7 offset high clamp value STAGE7 offset low clamp value STAGE8 CIN[6:0] connection setup (see Table 34) STAGE8 CIN[12:7]connection setup (see Table 35) STAGE8 AFE offset control (see Table 36) STAGE8 sensitivity control (see Table 37) STAGE8 initial offset low value STAGE8 initial offset high value STAGE8 offset high clamp value STAGE8 offset low clamp value STAGE9 CIN[6:0] connection setup (see Table 34) STAGE9 CIN[12:7]connection setup (see Table 35) STAGE9 AFE offset control (see Table 36) STAGE9 sensitivity control (see Table 37) STAGE9 initial offset low value STAGE9 initial offset high value STAGE9 offset high clamp value STAGE9 offset low clamp value STAGE10 CIN[6:0] connection setup (see Table 34) STAGE10 CIN[12:7]connection setup (see Table 35) STAGE10 AFE offset control (see Table 36) STAGE10 sensitivity control (see Table 37) STAGE10 initial offset low value STAGE10 initial offset high value STAGE10 offset high clamp value STAGE10 offset low clamp value STAGE11 CIN[6:0] connection setup (see Table 34) STAGE11 CIN[12:7] connection setup (see Table 35) STAGE11 AFE offset control (see Table 36) STAGE11 sensitivity control (see Table 37) STAGE11 initial offset low value STAGE11 initial offset high value STAGE11 offset high clamp value STAGE11 offset low clamp value AD7147 Data Sheet BANK 3 REGISTERS All address values are expressed in hexadecimal. Table 39. STAGE0 Results Registers Address 0x0E0 Data Bit [15:0] Default Value X Type R/W Name STAGE0_CONV_DATA 0x0E1 0x0E2 0x0E3 0x0E4 0x0E5 0x0E6 0x0E7 0x0E8 0x0E9 0x0EA 0x0EB 0x0EC 0x0ED 0x0EE 0x0EF 0x0F0 0x0F1 0x0F2 0x0F3 0x0F4 0x0F5 0x0F6 0x0F7 0x0F8 0x0F9 0x0FA 0x0FB 0x0FC 0x0FD 0x0FE 0x0FF 0x100 0x101 0x102 0x103 [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE0_FF_WORD0 STAGE0_FF_WORD1 STAGE0_FF_WORD2 STAGE0_FF_WORD3 STAGE0_FF_WORD4 STAGE0_FF_WORD5 STAGE0_FF_WORD6 STAGE0_FF_WORD7 STAGE0_SF_WORD0 STAGE0_SF_WORD1 STAGE0_SF_WORD2 STAGE0_SF_WORD3 STAGE0_SF_WORD4 STAGE0_SF_WORD5 STAGE0_SF_WORD6 STAGE0_SF_WORD7 STAGE0_SF_AMBIENT STAGE0_FF_AVG STAGE0_PEAK_DETECT_WORD0 STAGE0_PEAK_DETECT_WORD1 STAGE0_MAX_WORD0 STAGE0_MAX_WORD1 STAGE0_MAX_WORD2 STAGE0_MAX_WORD3 STAGE0_MAX_AVG STAGE0_HIGH_THRESHOLD STAGE0_MAX_TEMP STAGE0_MIN_WORD0 STAGE0_MIN_WORD1 STAGE0_MIN_WORD2 STAGE0_MIN_WORD3 STAGE0_MIN_AVG STAGE0_LOW_THRESHOLD STAGE0_MIN_TEMP Unused Rev. E | Page 58 of 70 Description STAGE0 CDC 16-bit conversion data (copy of CDC_RESULT_S0 register) STAGE0 fast FIFO WORD0 STAGE0 fast FIFO WORD1 STAGE0 fast FIFO WORD2 STAGE0 fast FIFO WORD3 STAGE0 fast FIFO WORD4 STAGE0 fast FIFO WORD5 STAGE0 fast FIFO WORD6 STAGE0 fast FIFO WORD7 STAGE0 slow FIFO WORD0 STAGE0 slow FIFO WORD1 STAGE0 slow FIFO WORD2 STAGE0 slow FIFO WORD3 STAGE0 slow FIFO WORD4 STAGE0 slow FIFO WORD5 STAGE0 slow FIFO WORD6 STAGE0 slow FIFO WORD7 STAGE0 slow FIFO ambient value STAGE0 fast FIFO average value STAGE0 peak FIFO WORD0 value STAGE0 peak FIFO WORD1 value STAGE0 maximum value FIFO WORD0 STAGE0 maximum value FIFO WORD1 STAGE0 maximum value FIFO WORD2 STAGE0 maximum value FIFO WORD3 STAGE0 average maximum FIFO value STAGE0 high threshold value STAGE0 temporary maximum value STAGE0 minimum value FIFO WORD0 STAGE0 minimum value FIFO WORD1 STAGE0 minimum value FIFO WORD2 STAGE0 minimum value FIFO WORD3 STAGE0 average minimum FIFO value STAGE0 low threshold value STAGE0 temporary minimum value Set to 0 Data Sheet AD7147 Table 40. STAGE1 Results Registers Address 0x104 Data Bit [15:0] Default Value X Type R/W Name STAGE1_CONV_DATA 0x105 0x106 0x107 0x108 0x109 0x10A 0x10B 0x10C 0x10D 0x10E 0x10F 0x110 0x111 0x112 0x113 0x114 0x115 0x116 0x117 0x118 0x119 0x11A 0x11B 0x11C 0x11D 0x11E 0x11F 0x120 0x121 0x122 0x123 0x124 0x125 0x126 0x127 [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE1_FF_WORD0 STAGE1_FF_WORD1 STAGE1_FF_WORD2 STAGE1_FF_WORD3 STAGE1_FF_WORD4 STAGE1_FF_WORD5 STAGE1_FF_WORD6 STAGE1_FF_WORD7 STAGE1_SF_WORD0 STAGE1_SF_WORD1 STAGE1_SF_WORD2 STAGE1_SF_WORD3 STAGE1_SF_WORD4 STAGE1_SF_WORD5 STAGE1_SF_WORD6 STAGE1_SF_WORD7 STAGE1_SF_AMBIENT STAGE1_FF_AVG STAGE1_PEAK_DETECT_WORD0 STAGE1_PEAK_DETECT_WORD1 STAGE1_MAX_WORD0 STAGE1_MAX_WORD1 STAGE1_MAX_WORD2 STAGE1_MAX_WORD3 STAGE1_MAX_AVG STAGE1_HIGH_THRESHOLD STAGE1_MAX_TEMP STAGE1_MIN_WORD0 STAGE1_MIN_WORD1 STAGE1_MIN_WORD2 STAGE1_MIN_WORD3 STAGE1_MIN_AVG STAGE1_LOW_THRESHOLD STAGE1_MIN_TEMP Unused Rev. E | Page 59 of 70 Description STAGE1 CDC 16-bit conversion data (copy of CDC_RESULT_S1 register STAGE1 fast FIFO WORD0 STAGE1 fast FIFO WORD1 STAGE1 fast FIFO WORD2 STAGE1 fast FIFO WORD3 STAGE1 fast FIFO WORD4 STAGE1 fast FIFO WORD5 STAGE1 fast FIFO WORD6 STAGE1 fast FIFO WORD7 STAGE1 slow FIFO WORD0 STAGE1 slow FIFO WORD1 STAGE1 slow FIFO WORD2 STAGE1 slow FIFO WORD3 STAGE1 slow FIFO WORD4 STAGE1 slow FIFO WORD5 STAGE1 slow FIFO WORD6 STAGE1 slow FIFO WORD7 STAGE1 slow FIFO ambient value STAGE1 fast FIFO average value STAGE1 peak FIFO WORD0 value STAGE1 peak FIFO WORD1 value STAGE1 maximum value FIFO WORD0 STAGE1 maximum value FIFO WORD1 STAGE1 maximum value FIFO WORD2 STAGE1 maximum value FIFO WORD3 STAGE1 average maximum FIFO value STAGE1 high threshold value STAGE1 temporary maximum value STAGE1 minimum value FIFO WORD0 STAGE1 minimum value FIFO WORD1 STAGE1 minimum value FIFO WORD2 STAGE1 minimum value FIFO WORD3 STAGE1 average minimum FIFO value STAGE1 low threshold value STAGE1 temporary minimum value Set to 0 AD7147 Data Sheet Table 41. STAGE2 Results Registers Address 0x128 Data Bit [15:0] Default Value X Type R/W Name STAGE2_CONV_DATA 0x129 0x12A 0x12B 0x12C 0x12D 0x12E 0x12F 0x130 0x131 0x132 0x133 0x134 0x135 0x136 0x137 0x138 0x139 0x13A 0x13B 0x13C 0x13D 0x13E 0x13F 0x140 0x141 0x142 0x143 0x144 0x145 0x146 0x147 0x148 0x149 0x14A 0x14B [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE2_FF_WORD0 STAGE2_FF_WORD1 STAGE2_FF_WORD2 STAGE2_FF_WORD3 STAGE2_FF_WORD4 STAGE2_FF_WORD5 STAGE2_FF_WORD6 STAGE2_FF_WORD7 STAGE2_SF_WORD0 STAGE2_SF_WORD1 STAGE2_SF_WORD2 STAGE2_SF_WORD3 STAGE2_SF_WORD4 STAGE2_SF_WORD5 STAGE2_SF_WORD6 STAGE2_SF_WORD7 STAGE2_SF_AMBIENT STAGE2_FF_AVG STAGE2_PEAK_DETECT_WORD0 STAGE2_PEAK_DETECT_WORD1 STAGE2_MAX_WORD0 STAGE2_MAX_WORD1 STAGE2_MAX_WORD2 STAGE2_MAX_WORD3 STAGE2_MAX_AVG STAGE2_HIGH_THRESHOLD STAGE2_MAX_TEMP STAGE2_MIN_WORD0 STAGE2_MIN_WORD1 STAGE2_MIN_WORD2 STAGE2_MIN_WORD3 STAGE2_MIN_AVG STAGE2_LOW_THRESHOLD STAGE2_MIN_TEMP Unused Rev. E | Page 60 of 70 Description STAGE2 CDC 16-bit conversion data (copy of CDC_RESULT_S2 register) STAGE2 fast FIFO WORD0 STAGE2 fast FIFO WORD1 STAGE2 fast FIFO WORD2 STAGE2 fast FIFO WORD3 STAGE2 fast FIFO WORD4 STAGE2 fast FIFO WORD5 STAGE2 fast FIFO WORD6 STAGE2 fast FIFO WORD7 STAGE2 slow FIFO WORD0 STAGE2 slow FIFO WORD1 STAGE2 slow FIFO WORD2 STAGE2 slow FIFO WORD3 STAGE2 slow FIFO WORD4 STAGE2 slow FIFO WORD5 STAGE2 slow FIFO WORD6 STAGE2 slow FIFO WORD7 STAGE2 slow FIFO ambient value STAGE2 fast FIFO average value STAGE2 peak FIFO WORD0 value STAGE2 peak FIFO WORD1 value STAGE2 maximum value FIFO WORD0 STAGE2 maximum value FIFO WORD1 STAGE2 maximum value FIFO WORD2 STAGE2 maximum value FIFO WORD3 STAGE2 average maximum FIFO value STAGE2 high threshold value STAGE2 temporary maximum value STAGE2 minimum value FIFO WORD0 STAGE2 minimum value FIFO WORD1 STAGE2 minimum value FIFO WORD2 STAGE2 minimum value FIFO WORD3 STAGE2 average minimum FIFO value STAGE2 low threshold value STAGE2 temporary minimum value Set to 0 Data Sheet AD7147 Table 42. STAGE3 Results Registers Address 0x14C Data Bit [15:0] Default Value X Type R/W Name STAGE3_CONV_DATA 0x14D 0x14E 0x14F 0x150 0x151 0x152 0x153 0x154 0x155 0x156 0x157 0x158 0x159 0x15A 0x15B 0x15C 0x15D 0x15E 0x15F 0x160 0x161 0x162 0x163 0x164 0x165 0x166 0x167 0x168 0x169 0x16A 0x16B 0x16C 0x16D 0x16E 0x16F [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE3_FF_WORD0 STAGE3_FF_WORD1 STAGE3_FF_WORD2 STAGE3_FF_WORD3 STAGE3_FF_WORD4 STAGE3_FF_WORD5 STAGE3_FF_WORD6 STAGE3_FF_WORD7 STAGE3_SF_WORD0 STAGE3_SF_WORD1 STAGE3_SF_WORD2 STAGE3_SF_WORD3 STAGE3_SF_WORD4 STAGE3_SF_WORD5 STAGE3_SF_WORD6 STAGE3_SF_WORD7 STAGE3_SF_AMBIENT STAGE3_FF_AVG STAGE3_PEAK_DETECT_WORD0 STAGE3_PEAK_DETECT_WORD1 STAGE3_MAX_WORD0 STAGE3_MAX_WORD1 STAGE3_MAX_WORD2 STAGE3_MAX_WORD3 STAGE3_MAX_AVG STAGE3_HIGH_THRESHOLD STAGE3_MAX_TEMP STAGE3_MIN_WORD0 STAGE3_MIN_WORD1 STAGE3_MIN_WORD2 STAGE3_MIN_WORD3 STAGE3_MIN_AVG STAGE3_LOW_THRESHOLD STAGE3_MIN_TEMP Unused Rev. E | Page 61 of 70 Description STAGE3 CDC 16-bit conversion data (copy of CDC_RESULT_S3 register) STAGE3 fast FIFO WORD0 STAGE3 fast FIFO WORD1 STAGE3 fast FIFO WORD2 STAGE3 fast FIFO WORD3 STAGE3 fast FIFO WORD4 STAGE3 fast FIFO WORD5 STAGE3 fast FIFO WORD6 STAGE3 fast FIFO WORD7 STAGE3 slow FIFO WORD0 STAGE3 slow FIFO WORD1 STAGE3 slow FIFO WORD2 STAGE3 slow FIFO WORD3 STAGE3 slow FIFO WORD4 STAGE3 slow FIFO WORD5 STAGE3 slow FIFO WORD6 STAGE3 slow FIFO WORD7 STAGE3 slow FIFO ambient value STAGE3 fast FIFO average value STAGE3 peak FIFO WORD0 value STAGE3 peak FIFO WORD1 value STAGE3 maximum value FIFO WORD0 STAGE3 maximum value FIFO WORD1 STAGE3 maximum value FIFO WORD2 STAGE3 maximum value FIFO WORD3 STAGE3 average maximum FIFO value STAGE3 high threshold value STAGE3 temporary maximum value STAGE3 minimum value FIFO WORD0 STAGE3 minimum value FIFO WORD1 STAGE3 minimum value FIFO WORD2 STAGE3 minimum value FIFO WORD3 STAGE3 average minimum FIFO value STAGE3 low threshold value STAGE3 temporary minimum value Set to 0 AD7147 Data Sheet Table 43. STAGE4 Results Registers Address 0x170 Data Bit [15:0] Default Value X Type R/W Name STAGE4_CONV_DATA 0x171 0x172 0x173 0x174 0x175 0x176 0x177 0x178 0x179 0x17A 0x17B 0x17C 0x17D 0x17E 0x17F 0x180 0x181 0x182 0x183 0x184 0x185 0x186 0x187 0x188 0x189 0x18A 0x18B 0x18C 0x18D 0x18E 0x18F 0x190 0x191 0x192 0x193 [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE4_FF_WORD0 STAGE4_FF_WORD1 STAGE4_FF_WORD2 STAGE4_FF_WORD3 STAGE4_FF_WORD4 STAGE4_FF_WORD5 STAGE4_FF_WORD6 STAGE4_FF_WORD7 STAGE4_SF_WORD0 STAGE4_SF_WORD1 STAGE4_SF_WORD2 STAGE4_SF_WORD3 STAGE4_SF_WORD4 STAGE4_SF_WORD5 STAGE4_SF_WORD6 STAGE4_SF_WORD7 STAGE4_SF_AMBIENT STAGE4_FF_AVG STAGE4_PEAK_DETECT_WORD0 STAGE4_PEAK_DETECT_WORD1 STAGE4_MAX_WORD0 STAGE4_MAX_WORD1 STAGE4_MAX_WORD2 STAGE4_MAX_WORD3 STAGE4_MAX_AVG STAGE4_HIGH_THRESHOLD STAGE4_MAX_TEMP STAGE4_MIN_WORD0 STAGE4_MIN_WORD1 STAGE4_MIN_WORD2 STAGE4_MIN_WORD3 STAGE4_MIN_AVG STAGE4_LOW_THRESHOLD STAGE4_MIN_TEMP Unused Rev. E | Page 62 of 70 Description STAGE4 CDC 16-bit conversion data (copy of CDC_RESULT_S4 register) STAGE4 fast FIFO WORD0 STAGE4 fast FIFO WORD1 STAGE4 fast FIFO WORD2 STAGE4 fast FIFO WORD3 STAGE4 fast FIFO WORD4 STAGE4 fast FIFO WORD5 STAGE4 fast FIFO WORD6 STAGE4 fast FIFO WORD7 STAGE4 slow FIFO WORD0 STAGE4 slow FIFO WORD1 STAGE4 slow FIFO WORD2 STAGE4 slow FIFO WORD3 STAGE4 slow FIFO WORD4 STAGE4 slow FIFO WORD5 STAGE4 slow FIFO WORD6 STAGE4 slow FIFO WORD7 STAGE4 slow FIFO ambient value STAGE4 fast FIFO average value STAGE4 peak FIFO WORD0 value STAGE4 peak FIFO WORD1 value STAGE4 maximum value FIFO WORD0 STAGE4 maximum value FIFO WORD1 STAGE4 maximum value FIFO WORD2 STAGE4 maximum value FIFO WORD3 STAGE4 average maximum FIFO value STAGE4 high threshold value STAGE4 temporary maximum value STAGE4 minimum value FIFO WORD0 STAGE4 minimum value FIFO WORD1 STAGE4 minimum value FIFO WORD2 STAGE4 minimum value FIFO WORD3 STAGE4 average minimum FIFO value STAGE4 low threshold value STAGE4 temporary minimum value Set to 0 Data Sheet AD7147 Table 44. STAGE5 Results Registers Address 0x194 Data Bit [15:0] Default Value X Type R/W Name STAGE5_CONV_DATA 0x195 0x196 0x197 0x198 0x199 0x19A 0x19B 0x19C 0x19D 0x19E 0x19F 0x1A0 0x1A1 0x1A2 0x1A3 0x1A4 0x1A5 0x1A6 0x1A7 0x1A8 0x1A9 0x1AA 0x1AB 0x1AC 0x1AD 0x1AE 0x1AF 0x1B0 0x1B1 0x1B2 0x1B3 0x1B4 0x1B5 0x1B6 0x1B7 [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE5_FF_WORD0 STAGE5_FF_WORD1 STAGE5_FF_WORD2 STAGE5_FF_WORD3 STAGE5_FF_WORD4 STAGE5_FF_WORD5 STAGE5_FF_WORD6 STAGE5_FF_WORD7 STAGE5_SF_WORD0 STAGE5_SF_WORD1 STAGE5_SF_WORD2 STAGE5_SF_WORD3 STAGE5_SF_WORD4 STAGE5_SF_WORD5 STAGE5_SF_WORD6 STAGE5_SF_WORD7 STAGE5_SF_AMBIENT STAGE5_FF_AVG STAGE5_PEAK_DETECT_WORD0 STAGE5_PEAK_DETECT_WORD1 STAGE5_MAX_WORD0 STAGE5_MAX_WORD1 STAGE5_MAX_WORD2 STAGE5_MAX_WORD3 STAGE5_MAX_AVG STAGE5_HIGH_THRESHOLD STAGE5_MAX_TEMP STAGE5_MIN_WORD0 STAGE5_MIN_WORD1 STAGE5_MIN_WORD2 STAGE5_MIN_WORD3 STAGE5_MIN_AVG STAGE5_LOW_THRESHOLD STAGE5_MIN_TEMP Unused Rev. E | Page 63 of 70 Description STAGE5 CDC 16-bit conversion data (copy of CDC_RESULT_S5 register) STAGE5 fast FIFO WORD0 STAGE5 fast FIFO WORD1 STAGE5 fast FIFO WORD2 STAGE5 fast FIFO WORD3 STAGE5 fast FIFO WORD4 STAGE5 fast FIFO WORD5 STAGE5 fast FIFO WORD6 STAGE5 fast FIFO WORD7 STAGE5 slow FIFO WORD0 STAGE5 slow FIFO WORD1 STAGE5 slow FIFO WORD2 STAGE5 slow FIFO WORD3 STAGE5 slow FIFO WORD4 STAGE5 slow FIFO WORD5 STAGE5 slow FIFO WORD6 STAGE5 slow FIFO WORD7 STAGE5 slow FIFO ambient value STAGE5 fast FIFO average value STAGE5 peak FIFO WORD0 value STAGE5 peak FIFO WORD1 value STAGE5 maximum value FIFO WORD0 STAGE5 maximum value FIFO WORD1 STAGE5 maximum value FIFO WORD2 STAGE5 maximum value FIFO WORD3 STAGE5 average maximum FIFO value STAGE5 high threshold value STAGE5 temporary maximum value STAGE5 minimum value FIFO WORD0 STAGE5 minimum value FIFO WORD1 STAGE5 minimum value FIFO WORD2 STAGE5 minimum value FIFO WORD3 STAGE5 average minimum FIFO value STAGE5 low threshold value STAGE5 temporary minimum value Set to 0 AD7147 Data Sheet Table 45. STAGE6 Results Registers Address 0x1B8 Data Bit [15:0] Default Value X Type R/W Name STAGE6_CONV_DATA 0x1B9 0x1BA 0x1BB 0x1BC 0x1BD 0x1BE 0x1BF 0x1C0 0x1C1 0x1C2 0x1C3 0x1C4 0x1C5 0x1C6 0x1C7 0x1C8 0x1C9 0x1CA 0x1CB 0x1CC 0x1CD 0x1CE 0x1CF 0x1D0 0x1D1 0x1D2 0x1D3 0x1D4 0x1D5 0x1D6 0x1D7 0x1D8 0x1D9 0x1DA 0x1DB [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE6_FF_WORD0 STAGE6_FF_WORD1 STAGE6_FF_WORD2 STAGE6_FF_WORD3 STAGE6_FF_WORD4 STAGE6_FF_WORD5 STAGE6_FF_WORD6 STAGE6_FF_WORD7 STAGE6_SF_WORD0 STAGE6_SF_WORD1 STAGE6_SF_WORD2 STAGE6_SF_WORD3 STAGE6_SF_WORD4 STAGE6_SF_WORD5 STAGE6_SF_WORD6 STAGE6_SF_WORD7 STAGE6_SF_AMBIENT STAGE6_FF_AVG STAGE6_PEAK_DETECT_WORD0 STAGE6_PEAK_DETECT_WORD1 STAGE6_MAX_WORD0 STAGE6_MAX_WORD1 STAGE6_MAX_WORD2 STAGE6_MAX_WORD3 STAGE6_MAX_AVG STAGE6_HIGH_THRESHOLD STAGE6_MAX_TEMP STAGE6_MIN_WORD0 STAGE6_MIN_WORD1 STAGE6_MIN_WORD2 STAGE6_MIN_WORD3 STAGE6_MIN_AVG STAGE6_LOW_THRESHOLD STAGE6_MIN_TEMP Unused Rev. E | Page 64 of 70 Description STAGE6 CDC 16-bit conversion data (copy of CDC_RESULT_S6 register) STAGE6 fast FIFO WORD0 STAGE6 fast FIFO WORD1 STAGE6 fast FIFO WORD2 STAGE6 fast FIFO WORD3 STAGE6 fast FIFO WORD4 STAGE6 fast FIFO WORD5 STAGE6 fast FIFO WORD6 STAGE6 fast FIFO WORD7 STAGE6 slow FIFO WORD0 STAGE6 slow FIFO WORD1 STAGE6 slow FIFO WORD2 STAGE6 slow FIFO WORD3 STAGE6 slow FIFO WORD4 STAGE6 slow FIFO WORD5 STAGE6 slow FIFO WORD6 STAGE6 slow FIFO WORD7 STAGE6 slow FIFO ambient value STAGE6 fast FIFO average value STAGE6 peak FIFO WORD0 value STAGE6 peak FIFO WORD1 value STAGE6 maximum value FIFO WORD0 STAGE6 maximum value FIFO WORD1 STAGE6 maximum value FIFO WORD2 STAGE6 maximum value FIFO WORD3 STAGE6 average maximum FIFO value STAGE6 high threshold value STAGE6 temporary maximum value STAGE6 minimum value FIFO WORD0 STAGE6 minimum value FIFO WORD1 STAGE6 minimum value FIFO WORD2 STAGE6 minimum value FIFO WORD3 STAGE6 average minimum FIFO value STAGE6 low threshold value STAGE6 temporary minimum value Set to 0 Data Sheet AD7147 Table 46. STAGE7 Results Registers Address 0x1DC Data Bit [15:0] Default Value X Type R/W Name STAGE7_CONV_DATA 0x1DD 0x1DE 0x1DF 0x1E0 0x1E1 0x1E2 0x1E3 0x1E4 0x1E5 0x1E6 0x1E7 0x1E8 0x1E9 0x1EA 0x1EB 0x1EC 0x1ED 0x1EE 0x1EF 0x1F0 0x1F1 0x1F2 0x1F3 0x1F4 0x1F5 0x1F6 0x1F7 0x1F8 0x1F9 0x1FA 0x1FB 0x1FC 0x1FD 0x1FE 0x1FF [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE7_FF_WORD0 STAGE7_FF_WORD1 STAGE7_FF_WORD2 STAGE7_FF_WORD3 STAGE7_FF_WORD4 STAGE7_FF_WORD5 STAGE7_FF_WORD6 STAGE7_FF_WORD7 STAGE7_SF_WORD0 STAGE7_SF_WORD1 STAGE7_SF_WORD2 STAGE7_SF_WORD3 STAGE7_SF_WORD4 STAGE7_SF_WORD5 STAGE7_SF_WORD6 STAGE7_SF_WORD7 STAGE7_SF_AMBIENT STAGE7_FF_AVG STAGE7_PEAK_DETECT_WORD0 STAGE7_PEAK_DETECT_WORD1 STAGE7_MAX_WORD0 STAGE7_MAX_WORD1 STAGE7_MAX_WORD2 STAGE7_MAX_WORD3 STAGE7_MAX_AVG STAGE7_HIGH_THRESHOLD STAGE7_MAX_TEMP STAGE7_MIN_WORD0 STAGE7_MIN_WORD1 STAGE7_MIN_WORD2 STAGE7_MIN_WORD3 STAGE7_MIN_AVG STAGE7_LOW_THRESHOLD STAGE7_MIN_TEMP Unused Rev. E | Page 65 of 70 Description STAGE7 CDC 16-bit conversion data (copy of CDC_RESULT_S7 register) STAGE7 fast FIFO WORD0 STAGE7 fast FIFO WORD1 STAGE7 fast FIFO WORD2 STAGE7 fast FIFO WORD3 STAGE7 fast FIFO WORD4 STAGE7 fast FIFO WORD5 STAGE7 fast FIFO WORD6 STAGE7 fast FIFO WORD7 STAGE7 slow FIFO WORD0 STAGE7 slow FIFO WORD1 STAGE7 slow FIFO WORD2 STAGE7 slow FIFO WORD3 STAGE7 slow FIFO WORD4 STAGE7 slow FIFO WORD5 STAGE7 slow FIFO WORD6 STAGE7 slow FIFO WORD7 STAGE7 slow FIFO ambient value STAGE7 fast FIFO average value STAGE7 peak FIFO WORD0 value STAGE7 peak FIFO WORD1 value STAGE7 maximum value FIFO WORD0 STAGE7 maximum value FIFO WORD1 STAGE7 maximum value FIFO WORD2 STAGE7 maximum value FIFO WORD3 STAGE7 average maximum FIFO value STAGE7 high threshold value STAGE7 temporary maximum value STAGE7 minimum value FIFO WORD0 STAGE7 minimum value FIFO WORD1 STAGE7 minimum value FIFO WORD2 STAGE7 minimum value FIFO WORD3 STAGE7 average minimum FIFO value STAGE7 low threshold value STAGE7 temporary minimum value Set to 0 AD7147 Data Sheet Table 47. STAGE8 Results Registers Address 0x200 Data Bit [15:0] Default Value X Type R/W Name STAGE8_CONV_DATA 0x201 0x202 0x203 0x204 0x205 0x206 0x207 0x208 0x209 0x20A 0x20B 0x20C 0x20D 0x20E 0x20F 0x210 0x211 0x212 0x213 0x214 0x215 0x216 0x217 0x218 0x219 0x21A 0x21B 0x21C 0x21D 0x21E 0x21F 0x220 0x221 0x222 0x223 [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE8_FF_WORD0 STAGE8_FF_WORD1 STAGE8_FF_WORD2 STAGE8_FF_WORD3 STAGE8_FF_WORD4 STAGE8_FF_WORD5 STAGE8_FF_WORD6 STAGE8_FF_WORD7 STAGE8_SF_WORD0 STAGE8_SF_WORD1 STAGE8_SF_WORD2 STAGE8_SF_WORD3 STAGE8_SF_WORD4 STAGE8_SF_WORD5 STAGE8_SF_WORD6 STAGE8_SF_WORD7 STAGE8_SF_AMBIENT STAGE8_FF_AVG STAGE8_PEAK_DETECT_WORD0 STAGE8_PEAK_DETECT_WORD1 STAGE8_MAX_WORD0 STAGE8_MAX_WORD1 STAGE8_MAX_WORD2 STAGE8_MAX_WORD3 STAGE8_MAX_AVG STAGE8_HIGH_THRESHOLD STAGE8_MAX_TEMP STAGE8_MIN_WORD0 STAGE8_MIN_WORD1 STAGE8_MIN_WORD2 STAGE8_MIN_WORD3 STAGE8_MIN_AVG STAGE8_LOW_THRESHOLD STAGE8_MIN_TEMP Unused Rev. E | Page 66 of 70 Description STAGE8 CDC 16-bit conversion data (copy of CDC_RESULT_S8 register) STAGE8 fast FIFO WORD0 STAGE8 fast FIFO WORD1 STAGE8 fast FIFO WORD2 STAGE8 fast FIFO WORD3 STAGE8 fast FIFO WORD4 STAGE8 fast FIFO WORD5 STAGE8 fast FIFO WORD6 STAGE8 fast FIFO WORD7 STAGE8 slow FIFO WORD0 STAGE8 slow FIFO WORD1 STAGE8 slow FIFO WORD2 STAGE8 slow FIFO WORD3 STAGE8 slow FIFO WORD4 STAGE8 slow FIFO WORD5 STAGE8 slow FIFO WORD6 STAGE8 slow FIFO WORD7 STAGE8 slow FIFO ambient value STAGE8 fast FIFO average value STAGE8 peak FIFO WORD0 value STAGE8 peak FIFO WORD1 value STAGE8 maximum value FIFO WORD0 STAGE8 maximum value FIFO WORD1 STAGE8 maximum value FIFO WORD2 STAGE8 maximum value FIFO WORD3 STAGE8 average maximum FIFO value STAGE8 high threshold value STAGE8 temporary maximum value STAGE8 minimum value FIFO WORD0 STAGE8 minimum value FIFO WORD1 STAGE8 minimum value FIFO WORD2 STAGE8 minimum value FIFO WORD3 STAGE8 average minimum FIFO value STAGE8 low threshold value STAGE7 temporary minimum value Set to 0 Data Sheet AD7147 Table 48. STAGE9 Results Registers Address 0x224 Data Bit [15:0] Default Value X Type R/W Name STAGE9_CONV_DATA 0x225 0x226 0x227 0x228 0x229 0x22A 0x22B 0x22C 0x22D 0x22E 0x22F 0x230 0x231 0x232 0x233 0x234 0x235 0x236 0x237 0x238 0x239 0x23A 0x23B 0x23C 0x23D 0x23E 0x23F 0x240 0x241 0x242 0x243 0x244 0x245 0x246 0x247 [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE9_FF_WORD0 STAGE9_FF_WORD1 STAGE9_FF_WORD2 STAGE9_FF_WORD3 STAGE9_FF_WORD4 STAGE9_FF_WORD5 STAGE9_FF_WORD6 STAGE9_FF_WORD7 STAGE9_SF_WORD0 STAGE9_SF_WORD1 STAGE9_SF_WORD2 STAGE9_SF_WORD3 STAGE9_SF_WORD4 STAGE9_SF_WORD5 STAGE9_SF_WORD6 STAGE9_SF_WORD7 STAGE9_SF_AMBIENT STAGE9_FF_AVG STAGE9_PEAK_DETECT_WORD0 STAGE9_PEAK_DETECT_WORD1 STAGE9_MAX_WORD0 STAGE9_MAX_WORD1 STAGE9_MAX_WORD2 STAGE9_MAX_WORD3 STAGE9_MAX_AVG STAGE9_HIGH_THRESHOLD STAGE9_MAX_TEMP STAGE9_MIN_WORD0 STAGE9_MIN_WORD1 STAGE9_MIN_WORD2 STAGE9_MIN_WORD3 STAGE9_MIN_AVG STAGE9_LOW_THRESHOLD STAGE9_MIN_TEMP Unused Rev. E | Page 67 of 70 Description STAGE9 CDC 16-bit conversion data (copy of CDC_RESULT_S9 register) STAGE9 fast FIFO WORD0 STAGE9 fast FIFO WORD1 STAGE9 fast FIFO WORD2 STAGE9 fast FIFO WORD3 STAGE9 fast FIFO WORD4 STAGE9 fast FIFO WORD5 STAGE9 fast FIFO WORD6 STAGE9 fast FIFO WORD7 STAGE9 slow FIFO WORD0 STAGE9 slow FIFO WORD1 STAGE9 slow FIFO WORD2 STAGE9 slow FIFO WORD3 STAGE9 slow FIFO WORD4 STAGE9 slow FIFO WORD5 STAGE9 slow FIFO WORD6 STAGE9 slow FIFO WORD7 STAGE9 slow FIFO ambient value STAGE9 fast FIFO average value STAGE9 peak FIFO WORD0 value STAGE9 peak FIFO WORD1 value STAGE9 maximum value FIFO WORD0 STAGE9 maximum value FIFO WORD1 STAGE9 maximum value FIFO WORD2 STAGE9 maximum value FIFO WORD3 STAGE9 average maximum FIFO value STAGE9 high threshold value STAGE9 temporary maximum value STAGE9 minimum value FIFO WORD0 STAGE9 minimum value FIFO WORD1 STAGE9 minimum value FIFO WORD2 STAGE9 minimum value FIFO WORD3 STAGE9 average minimum FIFO value STAGE9 low threshold value STAGE9 temporary minimum value Set to 0 AD7147 Data Sheet Table 49. STAGE10 Results Registers Address 0x248 Data Bit [15:0] Default Value X Type R/W Name STAGE10_CONV_DATA 0x249 0x24A 0x24B 0x24C 0x24D 0x24E 0x24F 0x250 0x251 0x252 0x253 0x254 0x255 0x256 0x257 0x258 0x259 0x25A 0x25B 0x25C 0x25D 0x25E 0x25F 0x260 0x261 0x262 0x263 0x264 0x265 0x266 0x267 0x268 0x269 0x26A 0x26B [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE10_FF_WORD0 STAGE10_FF_WORD1 STAGE10_FF_WORD2 STAGE10_FF_WORD3 STAGE10_FF_WORD4 STAGE10_FF_WORD5 STAGE10_FF_WORD6 STAGE10_FF_WORD7 STAGE10_SF_WORD0 STAGE10_SF_WORD1 STAGE10_SF_WORD2 STAGE10_SF_WORD3 STAGE10_SF_WORD4 STAGE10_SF_WORD5 STAGE10_SF_WORD6 STAGE10_SF_WORD7 STAGE10_SF_AMBIENT STAGE10_FF_AVG STAGE10_PEAK_DETECT_WORD0 STAGE10_PEAK_DETECT_WORD1 STAGE10_MAX_WORD0 STAGE10_MAX_WORD1 STAGE10_MAX_WORD2 STAGE10_MAX_WORD3 STAGE10_MAX_AVG STAGE10_HIGH_THRESHOLD STAGE10_MAX_TEMP STAGE10_MIN_WORD0 STAGE10_MIN_WORD1 STAGE10_MIN_WORD2 STAGE10_MIN_WORD3 STAGE10_MIN_AVG STAGE10_LOW_THRESHOLD STAGE10_MIN_TEMP Unused Rev. E | Page 68 of 70 Description STAGE10 CDC 16-bit conversion data (copy of CDC_RESULT_S10 register) STAGE10 fast FIFO WORD0 STAGE10 fast FIFO WORD1 STAGE10 fast FIFO WORD2 STAGE10 fast FIFO WORD3 STAGE10 fast FIFO WORD4 STAGE10 fast FIFO WORD5 STAGE10 fast FIFO WORD6 STAGE10 fast FIFO WORD7 STAGE10 slow FIFO WORD0 STAGE10 slow FIFO WORD1 STAGE10 slow FIFO WORD2 STAGE10 slow FIFO WORD3 STAGE10 slow FIFO WORD4 STAGE10 slow FIFO WORD5 STAGE10 slow FIFO WORD6 STAGE10 slow FIFO WORD7 STAGE10 slow FIFO ambient value STAGE10 fast FIFO average value STAGE10 peak FIFO WORD0 value STAGE10 peak FIFO WORD1 value STAGE10 maximum value FIFO WORD0 STAGE10 maximum value FIFO WORD1 STAGE10 maximum value FIFO WORD2 STAGE10 maximum value FIFO WORD3 STAGE10 average maximum FIFO value STAGE10 high threshold value STAGE10 temporary maximum value STAGE10 minimum value FIFO WORD0 STAGE10 minimum value FIFO WORD1 STAGE10 minimum value FIFO WORD2 STAGE10 minimum value FIFO WORD3 STAGE10 average minimum FIFO value STAGE10 low threshold value STAGE10 temporary minimum value Set to 0 Data Sheet AD7147 Table 50. STAGE11 Results Registers Address 0x26C Data Bit [15:0] Default Value X Type R/W Name STAGE11_CONV_DATA 0x26D 0x26E 0x26F 0x270 0x271 0x272 0x273 0x274 0x275 0x276 0x277 0x278 0x279 0x27A 0x27B 0x27C 0x27D 0x27E 0x27F 0x280 0x281 0x282 0x283 0x284 0x285 0x286 0x287 0x288 0x289 0x28A 0x28B 0x28C 0x28D 0x28E 0x28F [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] [15:0] X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X X R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W R/W STAGE11_FF_WORD0 STAGE11_FF_WORD1 STAGE11_FF_WORD2 STAGE11_FF_WORD3 STAGE11_FF_WORD4 STAGE11_FF_WORD5 STAGE11_FF_WORD6 STAGE11_FF_WORD7 STAGE11_SF_WORD0 STAGE11_SF_WORD1 STAGE11_SF_WORD2 STAGE11_SF_WORD3 STAGE11_SF_WORD4 STAGE11_SF_WORD5 STAGE11_SF_WORD6 STAGE11_SF_WORD7 STAGE11_SF_AMBIENT STAGE11_FF_AVG STAGE11_PEAK_DETECT_WORD0 STAGE11_PEAK_DETECT_WORD1 STAGE11_MAX_WORD0 STAGE11_MAX_WORD1 STAGE11_MAX_WORD2 STAGE11_MAX_WORD3 STAGE11_MAX_AVG STAGE11_HIGH_THRESHOLD STAGE11_MAX_TEMP STAGE11_MIN_WORD0 STAGE11_MIN_WORD1 STAGE11_MIN_WORD2 STAGE11_MIN_WORD3 STAGE11_MIN_AVG STAGE11_LOW_THRESHOLD STAGE11_MIN_TEMP Unused Rev. E | Page 69 of 70 Description STAGE11 CDC 16-bit conversion data (copy of CDC_RESULT_S11 register) STAGE11 fast FIFO WORD0 STAGE11 fast FIFO WORD1 STAGE11 fast FIFO WORD2 STAGE11 fast FIFO WORD3 STAGE11 fast FIFO WORD4 STAGE11 fast FIFO WORD5 STAGE11 fast FIFO WORD6 STAGE11 fast FIFO WORD7 STAGE11 slow FIFO WORD0 STAGE11 slow FIFO WORD1 STAGE11 slow FIFO WORD2 STAGE11 slow FIFO WORD3 STAGE11 slow FIFO WORD4 STAGE11 slow FIFO WORD5 STAGE11 slow FIFO WORD6 STAGE11 slow FIFO WORD7 STAGE11 slow FIFO ambient value STAGE11 fast FIFO average value STAGE11 peak FIFO WORD0 value STAGE11 peak FIFO WORD1 value STAGE11 maximum value FIFO WORD0 STAGE11 maximum value FIFO WORD1 STAGE11 maximum value FIFO WORD2 STAGE11 maximum value FIFO WORD3 STAGE11 average maximum FIFO value STAGE11 high threshold value STAGE11 temporary maximum value STAGE11 minimum value FIFO WORD0 STAGE11 minimum value FIFO WORD1 STAGE11 minimum value FIFO WORD2 STAGE11 minimum value FIFO WORD3 STAGE11 average minimum FIFO value STAGE11 low threshold value STAGE11 temporary minimum value Set to 0 AD7147 Data Sheet OUTLINE DIMENSIONS 0.30 0.25 0.18 0.50 BSC PIN 1 INDICATOR 24 19 18 1 EXPOSED PAD 2.65 2.50 SQ 2.45 13 TOP VIEW 0.80 0.75 0.70 0.50 0.40 0.30 6 12 BOTTOM VIEW 0.05 MAX 0.02 NOM COPLANARITY 0.08 SEATING PLANE 7 0.25 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. 0.20 REF COMPLIANT TO JEDEC STANDARDS MO-220-WGGD. 03-11-2013-A PIN 1 INDICATOR 4.10 4.00 SQ 3.90 Figure 63. 24-Lead Frame Chip Scale Package [LFCSP_WQ] 4 mm × 4 mm Very Very Thin Quad (CP-24-7) Dimensions shown in millimeters ORDERING GUIDE Model1, 2 AD7147ACPZ-REEL AD7147ACPZ-500RL7 AD7147PACPZ-RL AD7147PACPZ-500R7 AD7147ACPZ-1REEL AD7147ACPZ-1500RL7 AD7147PACPZ-1RL AD7147PACPZ-1500R7 AD7147WPACPZ-RL AD7147WPACPZ-500R7 AD7147WPACPZ-1RL AD7147WPACPZ-1500R EVAL-AD7147EBZ EVAL-AD7147-1EBZ 1 2 Temperature Range –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C –40°C to +85°C Description Wake up on touch Wake up on touch Wake up on proximity Wake up on proximity Wake up on touch Wake up on touch Wake up on proximity Wake up on proximity Wake up on proximity Wake up on proximity Wake up on proximity Wake up on proximity Serial Interface Description SPI Interface SPI Interface SPI Interface SPI Interface I2C Interface I2C Interface I2C Interface I2C Interface SPI Interface SPI Interface I2C Interface I2C Interface SPI Interface I2C Interface Package Description 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ 24-Lead LFCSP_WQ Evaluation Board Evaluation Board Package Option CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 CP-24-7 Z = RoHS Compliant Part. W = Qualified for Automotive Applications. AUTOMOTIVE PRODUCTS The AD7147W models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. Note that these automotive models may have specifications that differ from the commercial models; therefore, designers should review the Specifications section of this data sheet carefully. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for these models. ©2007–2015 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06663-0-1/15(E) Rev. E | Page 70 of 70