Product Folder Sample & Buy Support & Community Tools & Software Technical Documents FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 FDC2x1x EMI-Resistant 28-Bit,12-Bit Capacitance-to-Digital Converter for Proximity and Level Sensing Applications 1 Features 3 Description • • Capacitive sensing is a low-power, low-cost, highresolution contactless sensing technique that can be applied to a variety of applications ranging from proximity detection and gesture recognition to remote liquid level sensing. The sensor in a capacitive sensing system is any metal or conductor, allowing for low cost and highly flexible system design. 1 • • • • • • • • • • • EMI-Resistant Architecture Maximum Output Rates (one active channel): – 13.3 ksps (FDC2112, FDC2114) – 4.08 ksps (FDC2212, FDC2214) Maximum Input Capacitance: 250 nF (at 10 kHz with 1 mH inductor) Sensor Excitation Frequency: 10 kHz to 10 MHz Number of channels: 2, 4 Resolution: up to 28 bits System Noise Floor: 0.3 fF at 100 sps Supply Voltage: 2.7 V to 3.6 V Power Consumption: Active: 2.1 mA Low-Power Sleep Mode: 35 uA Shutdown: 200 nA Interface: I2C Temperature range: -40°C to +125°C The main challenge limiting sensitivity in capacitive sensing applications is noise susceptibility of the sensors. With the FDC2x1x innovative EMI resistant architecture, performance can be maintained even in presence of high-noise environments. The FDC2x1x is a multi-channel family of noise- and EMI-resistant, high-resolution, high-speed capacitance-to-digital converters for implementing capacitive sensing solutions. The devices employ an innovative narrow-band based architecture to offer high rejection of noise and interferers while providing high resolution at high speed. The devices support a wide excitation frequency range, offering flexibility in system design. A wide frequency range is especially useful for reliable sensing of conductive liquids such as detergent, soap, and ink. 2 Applications • • • • • • • Proximity Sensor Gesture Recognition Level Sensor for Liquids, including Conductive ones such as Detergent, Soap, and Ink Collision Avoidance Rain, Fog, Ice, Snow Sensor Automotive Door and Kick Sensors Material Size Detection Device Information(1) PART NUMBER PACKAGE BODY SIZE (NOM) FDC2112, FDC2212 WSON (DNT 12) 4.00 mm x 4.00 mm FDC2114, FDC2214 WQFN (RGH 16) 4.00 mm x 4.00 mm (1) For all available packages, see the orderable addendum at the end of the datasheet. Simplified Schematic 3.3 V 3.3 V FDC2114 / FDC2214 VDD CLKIN 40 MHz VDD Int. Osc. GND Resonant circuit driver INTB 0.1 F 1 F IN0A L C IN0B SD MCU Core IN3B GND ADDR IN3A C GPIO 3.3 V Cap Sensor 0 L GPIO Resonant circuit driver I 2C SDA SCL I 2C peripheral Cap Sensor 3 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 9 Features .................................................................. Applications ........................................................... Description ............................................................. Revision History..................................................... Description, continued .......................................... Device Comparison Table..................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 2 3 3 4 5 8.1 8.2 8.3 8.4 8.5 8.6 8.7 8.8 5 5 5 5 6 7 8 9 Absolute Maximum Ratings ...................................... ESD Ratings ............................................................ Recommended Operating Conditions....................... Thermal Information ................................................. Electrical Characteristics........................................... Timing Requirements ................................................ Switching Characteristics - I2C ................................. Typical Characteristics .............................................. Detailed Description ............................................ 11 9.1 Overview ................................................................. 11 9.2 Functional Block Diagrams ..................................... 11 9.3 Feature Description................................................. 12 9.4 Device Functional Modes........................................ 21 9.5 Programming........................................................... 21 9.6 Register Maps ......................................................... 22 10 Application and Implementation........................ 39 10.1 Application Information.......................................... 39 10.2 Typical Application ............................................... 40 10.3 Do's and Don'ts ..................................................... 46 11 Power Supply Recommendations ..................... 46 12 Layout................................................................... 46 12.1 Layout Guidelines ................................................. 46 12.2 Layout Example .................................................... 46 13 Device and Documentation Support ................. 51 13.1 13.2 13.3 13.4 13.5 13.6 Device Support...................................................... Related Links ........................................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 51 51 51 51 51 51 14 Mechanical, Packaging, and Orderable Information ........................................................... 51 4 Revision History Changes from Original (June 2015) to Revision A • 2 Page Added full datasheet. ............................................................................................................................................................. 1 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 5 Description, continued The FDC221x is optimized for high resolution, up to 28 bits, while the FDC211x offers fast sample rate, up to 13.3ksps, for easy implementation of applications that use fast moving targets. The very large maximum input capacitance of 250 nF allows for the use of remote sensors, as well as for tracking environmental changes over time, temperature and humidity. The FDC2x1x family targets proximity sensing and liquid level sensing applications for any type of liquids. For non-conductive liquid level sensing applications in the presence of interferences such as human hands, the FDC1004 is recommended, which has integrated active shield drivers. 6 Device Comparison Table PART NUMBER RESOLUTION CHANNELS PACKAGE FDC2112 12 bit 2 WSON-12 FDC2114 12 bit 4 WQFN-16 FDC2212 28 bit 2 WSON-12 FDC2214 28 bit 4 WQFN-16 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 3 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 7 Pin Configuration and Functions FDC2112/FDC2212 WSON DNT-12 Top View SCL 1 12 IN1B SDA 2 11 IN1A CLKIN 3 10 IN0B ADDR 4 9 IN0A INTB 5 8 GND SD 6 7 VDD DAP SCL 1 SDA 2 IN3B IN3A IN2B IN2A 16 15 14 13 FDC2114/FDC2214 WQFN RGH-16 Top View 12 IN1B 11 IN1A DAP 8 IN0A GND 9 7 4 VDD ADDR 6 IN0B SD 10 5 3 INTB CLKIN Pin Functions PIN NAME NO. TYPE (1) DESCRIPTION SCL 1 I SDA 2 I/O CLKIN 3 I Master Clock input. Tie this pin to GND if internal oscillator is selected ADDR 4 I I2C Address selection pin: when ADDR=L, I2C address = 0x2A, when ADDR=H, I2C address = 0x2B. INTB 5 O Configurable Interrupt output pin SD 6 I Shutdown input VDD 7 P Power Supply GND 8 G Ground IN0A 9 A Capacitive sensor input 0 IN0B 10 A Capacitive sensor input 0 IN1A 11 A Capacitive sensor input 1 IN1B 12 A Capacitive sensor input 1 IN2A 13 A Capacitive sensor input 2 (FDC2114 / FDC2214 only) IN2B 14 A Capacitive sensor input 2 (FDC2114 / FDC2214 only) (1) 4 I2C Clock input I2C Data input/output I = Input, O = Output, P=Power, G=Ground, A=Analog Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Pin Functions (continued) PIN NAME NO. TYPE (1) DESCRIPTION IN3A 15 A Capacitive sensor input 3 (FDC2114 / FDC2214 only) IN3B 16 A Capacitive sensor input 3 (FDC2114 / FDC2214 only) DAP N/A DAP (2) (2) Connect to Ground There is an internal electrical connection between the exposed Die Attach Pad (DAP) and the GND pin of the device. Although the DAP can be left floating, for best performance the DAP should be connected to the same potential as the device's GND pin. Do not use the DAP as the primary ground for the device. The device GND pin must always be connected to ground. 8 Specifications 8.1 Absolute Maximum Ratings MIN MAX UNIT 5 V –0.3 VDD + 0.3 V Input current on any INx pin –8 8 mA Input current on any digital pin –5 5 mA TJ Junction temperature –55 150 °C Tstg Storage temperature –65 150 °C VDD Supply voltage range Vi Voltage on any pin IA ID (1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. 8.2 ESD Ratings VALUE UNIT FDC2112 / FDC2212 in 12-pin WSON package V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22C101 (2) ±750 V FDC2114 / FDC2214 in 16-pin WQFN package V(ESD) (1) (2) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) ±2000 Charged-device model (CDM), per JEDEC specification JESD22C101 (2) ±750 V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 8.3 Recommended Operating Conditions Unless otherwise specified, all limits ensured for TA = 25°C, VDD = 3.3 V MIN NOM MAX UNIT VDD Supply voltage 2.7 3.6 V TA Operating temperature –40 125 °C 8.4 Thermal Information THERMAL METRIC (1) RθJA (1) Junction-to-ambient thermal resistance FDC2112 / FDC2212 FDC2214 / FDC2214 DNT (WSON) RGH (WQFN) 12 PINS 16 PINS 50 38 UNIT °C/W For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 5 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 8.5 Electrical Characteristics Unless otherwise specified, all limits ensured for TA = 25°C, VDD = 3.3 V (1) PARAMETER TEST CONDITIONS (2) MIN (3) TYP (4) MAX (3) VDD Supply voltage TA = –40°C to +125°C 2.7 IDD Supply durrent (not including sensor current) (5) CLKIN = 10MHz (6) IDDSL Sleep mode supply current (5) 35 60 µA ISD Shutdown mode supply current (5) 0.2 1 µA UNIT POWER 3.6 2.1 V mA CAPACITIVE SENSOR CSENSORMAX Maximum sensor capacitance CIN Sensor pin parasitic capacitance NBITS Number of bits fCS Maximum channel sample rate 1mH inductor, 10kHz oscillation 250 nF 4 pF FDC2112, FDC2114 RCOUNT ≥ 0x0400 12 bits FDC2212, FDC2214 RCOUNT = 0xFFFF 28 bits FDC2112, FDC2114 single active channel continuous conversion, SCL = 400 kHz 13.3 kSPS FDC2212, FDC2214 single active channel continuous conversion, SCL= 400 kHz 4.08 kSPS 10 MHz EXCITATION fSENSOR Sensor excitation frequency VSENSORMIN Minimum sensor oscillation amplitude (pk) (7) TA = –40°C to +125°C 0.01 1.2 V VSENSORMAX Maximum sensor oscillation amplitude (pk) 1.8 V ISENSORMAX Sensor maximum current drive HIGH_CURRENT_DRV = b0 DRIVE_CURRENT_CH0 = 0xF800 1.5 mA HIGH_CURRENT_DRV = b1 DRIVE_CURRENT_CH0 = 0xF800 Channel 0 only 6 mA MASTER CLOCK fCLKIN External master clock input frequency (CLKIN) CLKINDUTY_MIN External master clock minimum acceptable duty cycle (CLKIN) 40% CLKINDUTY_MAX External master clock maximum acceptable duty cycle (CLKIN) 60% VCLKIN_LO CLKIN low voltage threshold (1) (2) (3) (4) (5) (6) (7) 6 TA = –40°C to +125°C 2 40 0.3*VDD MHz V Electrical Characteristics values apply only for factory testing conditions at the temperature indicated. Factory testing conditions result in very limited self-heating of the device such that TJ = TA. No guarantee of parametric performance is indicated in the electrical tables under conditions of internal self-heating where TJ > TA. Absolute Maximum Ratings indicate junction temperature limits beyond which the device may be permanently degraded, either mechanically or electrically. Register values are represented as either binary (b is the prefix to the digits), or hexadecimal (0x is the prefix to the digits). Decimal values have no prefix. Limits are ensured by testing, design, or statistical analysis at 25°C. Limits over the operating temperature range are ensured through correlations using statistical quality control (SQC) method. Typical values represent the most likely parametric norm as determined at the time of characterization. Actual typical values may vary over time and will also depend on the application and configuration. The typical values are not tested and are not ensured on shipped production material. I2C read/write communication and pull-up resistors current through SCL, SDA not included. Sensor capacitor: 1 layer, 20.9 x 13.9 mm, Bourns CMH322522-180KL sensor inductor with L=18µH and 33pF 1% COG/NP0 Target: Grounded aluminum plate (176 x 123 mm), Channel = Channel 0 (continuous mode) CLKIN = 40 MHz, CHx_FIN_SEL = b10, CHx_FREF_DIVIDER = b00 0000 0001 CH0_RCOUNT = 0xFFFF, SETTLECOUNT_CH0 = 0x0100, DRIVE_CURRENT_CH0 = 0x7800. Lower VSENSORMIN oscillation amplitudes can be used, but will result in lower SNR. Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Electrical Characteristics (continued) Unless otherwise specified, all limits ensured for TA = 25°C, VDD = 3.3 V(1) TEST CONDITIONS (2) PARAMETER VCLKIN_HI CLKIN high voltage threshold fINTCLK Internal master clock frequency range TCf_int_μ Internal master clock temperature coefficient mean MIN (3) TYP (4) MAX (3) UNIT 0.7*VDD V 35 43.4 55 –13 MHz ppm/°C 8.6 Timing Requirements MIN tSDWAKEUP NOM Wake-up time from SD high-low transition to I2C readback tSLEEPWAKEUP Wake-up time from sleep mode tWD-TIMEOUT Sensor recovery time (after watchdog timeout) MAX UNIT 2 ms 0.05 ms 5.2 ms I2C TIMING CHARACTERISTICS fSCL Clock frequency 10 tLOW Clock low time 1.3 μs tHIGH Clock high time 0.6 μs tHD;STA Hold time (repeated) START condition: after this period, the first clock pulse is generated 0.6 μs tSU;STA Setup time for a repeated START condition 0.6 μs tHD;DAT Data hold time 0 μs tSU;DAT Data setup time 100 ns tSU;STO Setup time for STOP condition 0.6 μs tBUF Bus free time between a STOP and START condition 1.3 tVD;DAT Data valid time 0.9 μs tVD;ACK Data valid acknowledge time 0.9 μs 50 ns tSP (1) Pulse width of spikes that must be suppressed by the input filter 400 kHz μs (1) This parameter is specified by design and/or characterization and is not tested in production. SDA tLOW tf tHD;STA tr tf tr tBUF tSP SCL tSU;STA tHD;STA tHIGH tHD;DAT START tSU;STO tSU;DAT STOP REPEATED START START Figure 1. I2C Timing Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 7 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 8.7 Switching Characteristics - I2C Unless otherwise specified, all limits ensured for TA = 25°C, VDD = 3.3 V PARAMETER TEST CONDITIONS MIN TYP MAX UNIT VOLTAGE LEVELS VIH Input high voltage VIL Input low voltage VOL Output low voltage (3 mA sink current) HYS Hysteresis 8 0.7ˣVDD V 0.1ˣVDD Submit Documentation Feedback 0.3ˣVDD V 0.4 V V Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 8.8 Typical Characteristics Common test conditions (unless specified otherwise): Sensor capacitor: 1 layer, 20.9 x 13.9 mm, Bourns CMH322522-180KL sensor inductor with L=18 µH and 33 pF 1% COG/NP0 Target: Grounded aluminum plate (176 x 123 mm), Channel = Channel 0 (continuous mode) CLKIN = 40 MHz, CHx_FIN_SEL = b01, CHx_FREF_DIVIDER = b00 0000 0001 CH0_RCOUNT = 0xFFFF, SETTLECOUNT_CH0 = 0x0100, DRIVE_CURRENT_CH0 = 0x7800. 3.25 3.25 IDD CH0 Current (mA) 3.225 3.2 IDD CH0 Current (mA) VDD = 2.7 V VDD = 3 V VDD = 3.3 V VDD = 3.6 V 3.175 3.15 3.125 3.1 3.2 3.15 3.1 -40°C -20°C 0°C 25°C 3.075 3.05 -40 -20 0 20 40 60 Temperature (°C) 80 100 3.05 2.7 120 2.8 Includes 1.57 mA sensor current –40°C to +125°C Figure 2. Active Mode IDD vs. Temperature 3.3 3.4 3.5 3.6 D004 Figure 3. Active Mode IDD vs. VDD VDD = 2.7 V VDD = 3 V VDD = 3.3 V VDD = 3.6 V -40°C -20°C 60 0°C 25°C 50°C 85°C 100°C 125°C 55 45 40 35 50 45 40 35 30 25 -40 3.1 3.2 VDD (V) 65 Sleep Current (µA) Sleep Current (µA) 50 3 Includes 1.57 mA sensor current 60 55 2.9 D003 50°C 85°C 100°C 125°C 30 -20 0 20 40 60 Temperature (°C) 80 100 25 2.7 120 2.8 2.9 3 D005 3.1 3.2 VDD (V) 3.3 3.4 3.5 3.6 D006 –40°C to +125°C Figure 4. Sleep Mode IDD vs. Temperature Figure 5. Sleep Mode IDD vs. VDD 1.4 1 0.8 0.6 0.4 0.2 0 -40 -40°C -20°C 1.4 Shutdown Current (µA) Shutdown Current (µA) 1.2 1.6 VDD = 2.7 V VDD = 3 V VDD = 3.3 V VDD = 3.6 V 0°C 25°C 50°C 85°C 100°C 125°C 1.2 1 0.8 0.6 0.4 0.2 -20 0 20 40 60 Temperature (°C) 80 100 120 0 2.7 2.8 2.9 3 D007 3.1 3.2 VDD (V) 3.3 3.4 3.5 3.6 D008 –40°C to +125°C Figure 6. Shutdown Mode IDD vs. Temperature Copyright © 2015, Texas Instruments Incorporated Figure 7. Shutdown Mode IDD vs. VDD Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 9 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Typical Characteristics (continued) Common test conditions (unless specified otherwise): Sensor capacitor: 1 layer, 20.9 x 13.9 mm, Bourns CMH322522-180KL sensor inductor with L=18 µH and 33 pF 1% COG/NP0 Target: Grounded aluminum plate (176 x 123 mm), Channel = Channel 0 (continuous mode) CLKIN = 40 MHz, CHx_FIN_SEL = b01, CHx_FREF_DIVIDER = b00 0000 0001 CH0_RCOUNT = 0xFFFF, SETTLECOUNT_CH0 = 0x0100, DRIVE_CURRENT_CH0 = 0x7800. 43.41 43.4 VDD = 2.7 V VDD = 3 V VDD = 3.3 V VDD = 3.6 V 43.38 43.37 43.36 43.35 43.34 43.33 43.32 -40 0°C 25°C 50°C 85°C 100°C 125°C 43.39 43.38 43.37 43.36 43.35 43.34 43.33 -20 0 20 40 60 Temperature (°C) 80 100 120 43.32 2.7 2.8 2.9 3 D009 –40°C to +125°C 3.1 3.2 VDD (V) 3.3 3.4 3.5 3.6 D010 Data based on 1 unit Figure 8. Internal Oscillator Frequency vs. Temperature 10 -40°C -20°C 43.4 Internal Oscillator (MHz) Internal Oscillator (MHz) 43.39 Submit Documentation Feedback Figure 9. Internal Oscillator Frequency vs. VDD Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 9 Detailed Description 9.1 Overview The FDC2112, FDC2114, FDC2212, and FDC2214 are high-resolution, multichannel capacitance-to-digital converters for implementing capacitive sensing solutions. In contrast to traditional switched-capacitance architectures, the FDC2112, FDC2114, FDC2212, and FDC2214 employ an L-C resonator, also known as L-C tank, as a sensor. The narrow-band architecture allows unprecedented EMI immunity and greatly reduced noise floor when compared to other capacitive sensing solutions. Using this approach, a change in capacitance of the L-C tank can be observed as a shift in the resonant frequency. Using this principle, the FDC is a capacitance-to-digital converter (FDC) that measures the oscillation frequency of an LC resonator. The device outputs a digital value that is proportional to frequency. This frequency measurement can be converted to an equivalent capacitance 9.2 Functional Block Diagrams 3.3 V 3.3 V FDC2112 / FDC2212 VDD CLKIN 40 MHz VDD Int. Osc. GND Resonant circuit driver INTB 0.1 F 1 F IN0A L C IN0B SD MCU Core IN1B GND ADDR IN1A C GPIO 3.3 V Cap Sensor 0 L GPIO Resonant circuit driver 2 IC I 2C peripheral SDA SCL Cap Sensor 1 Figure 10. Block Diagram for the FDC2112 and FDC2212 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 11 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Functional Block Diagrams (continued) 3.3 V 3.3 V FDC2114 / FDC2214 VDD CLKIN 40 MHz VDD Int. Osc. GND Resonant circuit driver INTB 0.1 F 1 F IN0A L C IN0B SD MCU Core IN3B GND ADDR IN3A C GPIO 3.3 V Cap Sensor 0 L GPIO Resonant circuit driver 2 IC I 2C peripheral SDA SCL Cap Sensor 3 Figure 11. Block Diagrams for the FDC2114 and FDC2214 The FDC is composed of front-end resonant circuit drivers, followed by a multiplexer that sequences through the active channels, connecting them to the core that measures and digitizes the sensor frequency (fSENSOR). The core uses a reference frequency (fREF) to measure the sensor frequency. fREF is derived from either an internal reference clock (oscillator), or an externally supplied clock. The digitized output for each channel is proportional to the ratio of fSENSOR/fREF. The I2C interface is used to support device configuration and to transmit the digitized frequency values to a host processor. The FDC can be placed in shutdown mode, saving current, using the SD pin. The INTB pin may be configured to notify the host of changes in system status. 9.3 Feature Description 9.3.1 Clocking Architecture Figure 12 shows the clock dividers and multiplexers of the FDC. 12 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Feature Description (continued) Cap Sensor 0 L fSENSOR0 IN0A ÷m tfIN0t IN0B CH0_FIN_SEL (0x14) Cap Sensor 1 L fSENSOR1 IN1A ÷m tfIN1t IN1B tfINt CH1_FIN_SEL (0x15) Cap Sensor 2(1) Cap Sensor 3(1) L fSENSOR2(1) IN2A(1) ÷m IN2B L fSENSOR3(1) tfIN2(1)t (1) CH2_FIN_SEL (0x16)(1) IN3A(1) ÷m IN3B tfIN3(1)t (1) CH3_FIN_SEL (0x17)(1) ÷n CONFIG (0x1A) MUX_CONFIG (0x1B) Core tfREF0t CH0_FREF_DIVIDER (0x14) REF_CLK_SRC (0x1A) fCLKIN ÷n CLKIN tfCLKt tfREF1t tfREFt CH1_FREF_DIVIDER (0x15) tfINTt ÷n Int. Osc. tfREF2(1)t CH2_FREF_DIVIDER (0x16)(1) ÷n CH3_FREF_DIVIDER (0x17)(1) (1) Data Output tfREF3(1)t CONFIG (0x1A) MUX_CONFIG (0x1B) FDC2114 / FDC2214 only Figure 12. Clocking Diagram In Figure 12, the key clocks are fIN, fREF, and fCLK. fCLK is selected from either the internal clock source or external clock source (CLKIN) . The frequency measurement reference clock, fREF, is derived from the fCLK source. It is recommended that precision applications use an external master clock that offers the stability and accuracy requirements needed for the application. The internal oscillator may be used in applications that require low cost and do not require high precision. The fINx clock is derived from sensor frequency for a channel x, fSENSORx. fREFx and fINx must meet the requirements listed in Table 1, depending on whether fCLK (master clock) is the internal or external clock. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 13 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Feature Description (continued) Table 1. Clock Configuration Requirements MODE (1) Multi-channel Single-channel (1) (2) VALID fREFx RANGE (MHz) CLKIN SOURCE Internal fREFx ≤ 55 External fREFx ≤ 40 Either external or internal fREFx ≤ 35 VALID fINx RANGE SET CHx_FIN_SEL to (2) SET CHx_SETTLECO UNT to SET CHx_RCOUNT to < fREFx /4 Differential sensor configuration: b01: 0.01MHz to 8.75MHz (divide by 1) b10: 5MHz to 10MHz (divide by 2) Single-ended sensor configuration b10: 0.01MHz to 10MHz (divide by 2) >3 >8 Channels 2 and 3 are only available for FDC2114 and FDC2214. Refer to Sensor Configuration for information on differential and single-ended sensor configurations. Table 2 shows the clock configuration registers for all channels. Table 2. Clock Configuration Registers CHANNEL CLOCK REGISTER FIELD [ BIT(S) ] VALUE fCLK = Master Clock Source CONFIG, addr 0x1A REF_CLK_SRC [9] b0 = internal oscillator is used as the master clock b1 = external clock source is used as the master clock 0 fREF0 CLOCK_DIVIDER S_CH0, addr 0x14 CH0_FREF_DIVIDER [9:0] fREF0 = fCLK / CH0_FREF_DIVIDER 1 fREF1 CLOCK_DIVIDER S_CH1, addr 0x15 CH1_FREF_DIVIDER [9:0] fREF1 = fCLK / CH1_FREF_DIVIDER 2 fREF2 CLOCK_DIVIDER S_CH2, addr 0x16 CH2_FREF_DIVIDER [9:0] fREF2 = fCLK / CH2_FREF_DIVIDER 3 fREF3 CLOCK_DIVIDER S_CH3, addr 0x17 CH3_FREF_DIVIDER [9:0] fREF3 = fCLK / CH3_FREF_DIVIDER 0 fIN0 CLOCK_DIVIDER S_CH0, addr 0x14 CH0_FIN_SEL [13:12] fIN0 = fSENSOR0 / CH0_FIN_SEL 1 fIN1 CLOCK_DIVIDER S_CH1, addr 0x15 CH1_FIN_SEL [13:12] fIN1 = fSENSOR1 / CH1_FIN_SEL 2 fIN2 CLOCK_DIVIDER S_CH2, addr 0x16 CH2_FIN_SEL [13:12] fIN2 = fSENSOR2 / CH2_FIN_SEL 3 fIN3 CLOCK_DIVIDER S_CH3, addr 0x17 CH3_FIN_SEL [13:12] fIN3 = fSENSOR3 / CH3_FIN_SEL All (1) (1) Channels 2 and 3 are only available for FDC2114 and FDC2214 9.3.2 Multi-Channel and Single-Channel Operation The multi-channel package of the FDC enables the user to save board space and support flexible system design. For example, temperature drift can often cause a shift in component values, resulting in a shift in resonant frequency of the sensor. Using a second sensor as a reference provides the capability to cancel out a temperature shift. When operated in multi-channel mode, the FDC sequentially samples the active channels. In single-channel mode, the FDC samples a single channel, which is selectable. Table 3 shows the registers and values that are used to configure either multi-channel or single-channel modes. 14 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 3. Single- and Multi-Channel Configuration Registers MODE REGISTER FIELD [ BIT(S) ] VALUE 00 = chan 0 CONFIG, addr 0x1A 01 = chan 1 ACTIVE_CHAN [15:14] 10 = chan 2 Single channel 11 = chan 3 MUX_CONFIG addr 0x1B AUTOSCAN_EN [15] 0 = continuous conversion on a single channel (default) MUX_CONFIG addr 0x1B AUTOSCAN_EN [15] 1 = continuous conversion on multiple channels MUX_CONFIG addr 0x1B RR_SEQUENCE [14:13] 00 = Ch0, Ch 1 Multi-channel 01 = Ch0, Ch 1, Ch 2 10 = Ch0, CH1, Ch2, Ch3 The digitized sensor measurement for each channel (DATAx) represents the ratio of the sensor frequency to the reference frequency. The data output (DATAx) of the FDC2112 and FDC2114 is expressed as the 12 MSBs of a 16-bit result: DATA x ¦SENSORx 12 ¦REFx (1) The data output (DATAx) of the FDC2212 and FDC2214 is expressed as: DATA x ¦SENSORx 28 ¦REFx (2) Table 4 illustrates the registers that contain the fixed point sample values for each channel. Table 4. Sample Data Registers CHANNEL (1) REGISTER (2) DATA0 [11:0]: 12 bits of the 16 bit result. 0x000 = under range 0xfff = over range DATA0 [27:16]: 12 MSBs of the 28 bit result DATA_LSB_CH0, addr 0x01 Not applicable DATA0 [15:0]: 16 LSBs of the 28 bit conversion result DATA_CH1, addr 0x02 DATA1 [11:0]: 12 bits of the 16 bit result. 0x000 = under range 0xfff = over range DATA1 [27:16]: 12 MSBs of the 28 bit result DATA_LSB_CH1, addr 0x03 Not applicable DATA1 [15:0]: 16 LSBs of the 28 bit conversion result DATA_CH2, addr 0x04 DATA2 [11:0]: 12 bits of the 16 bit result. 0x000 = under range 0xfff = over range DATA2 [27:16]: 12 MSBs of the 28 bit result DATA_LSB_CH2, addr 0x05 Not applicable DATA2 [15:0]: 16 LSBs of the 28 bit conversion result 1 2 (3) (4) FIELD NAME [ BITS(S) ] AND VALUE (FDC2212, FDC2214) (3) (4) DATA_CH0, addr 0x00 0 (1) (2) FIELD NAME [ BITS(S) ] AND VALUE (FDC2112, FDC2114) Channels 2 and 3 are only available for FDC2114 and FDC2214. The DATA_CHx.DATAx register must always be read first, followed by the DATA_LSB_ CHx.DATAx register of the same channel to ensure data coherency. A DATA value of 0x0000000 = under range for FDC2212/FDC2214. A DATA value of 0xFFFFFFF = over range for FDC2212/FDC2214. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 15 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table 4. Sample Data Registers (continued) CHANNEL (1) REGISTER (2) FIELD NAME [ BITS(S) ] AND VALUE (FDC2112, FDC2114) FIELD NAME [ BITS(S) ] AND VALUE (FDC2212, FDC2214) (3) (4) DATA_CH3, addr 0x06 DATA3 [11:0]: 12 bits of the 16 bit result. 0x000 = under range 0xfff = over range DATA3 [27:16]: 12 MSBs of the 28 bit result DATA_LSB_CH3, addr 0x07 Not applicable DATA3 [15:0]: 16 LSBs of the 28 bit conversion result 3 When the FDC sequences through the channels in multi-channel mode, the dwell time interval for each channel is the sum of three parts: 1. sensor activation time 2. conversion time 3. channel switch delay The sensor activation time is the amount of settling time required for the sensor oscillation to stabilize, as shown in Figure 13. The settling wait time is programmable and should be set to a value that is long enough to allow stable oscillation. The settling wait time for channel x is given by: tSx = (CHX_SETTLECOUNTˣ16)/fREFx (3) Table 5 illustrates the registers and values for configuring the settling time for each channel. Channel 0 Sensor Activation Channel 0 Conversion Channel switch delay Channel 1 Sensor Activation Channel 1 Conversion Channel switch delay Channel 0 Sensor Activation Channel 0 Channel 1 Figure 13. Multi-channel Mode Sequencing Active Channel Sensor Signal Sensor Activation Conversion Conversion Amplitude Correction Conversion Amplitude Correction Amplitude Correction Figure 14. Single-channel Mode Sequencing 16 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 5. Settling Time Register Configuration CHANNEL (1) (2) (1) REGISTER CONVERSION TIME (2) FIELD 0 SETTLECOUNT_CH0, addr 0x10 CH0_SETTLECOUNT [15:0] (CH0_SETTLECOUNT*16)/fREF0 1 SETTLECOUNT_CH1, addr 0x11 CH1_SETTLECOUNT [15:0] (CH1_SETTLECOUNT*16)/fREF1 2 SETTLECOUNT_CH2, addr 0x12 CH2_SETTLECOUNT [15:0] (CH2_SETTLECOUNT*16)/fREF2 3 SETTLECOUNT_CH3, addr 0x13 CH3_SETTLECOUNT [15:0] (CH3_SETTLECOUNT*16)/fREF3 Channels 2 and 3 are available only in the FDC2114 and FDC2214. fREFx is the reference frequency configured for the channel. The SETTLECOUNT for any channel x must satisfy: CHx_SETTLECOUNT > Vpk × fREFx × C × π2 / (32 × IDRIVEX) where • • • • Vpk = Peak oscillation amplitude at the programmed IDRIVE setting fREFx = Reference frequency for Channel x C = sensor capacitance including parasitic PCB capacitance IDRIVEX = setting programmed into the IDRIVE register in amps (4) Round the result to the next highest integer (for example, if Equation 4 recommends a minimum value of 6.08, program the register to 7 or higher). The conversion time represents the number of reference clock cycles used to measure the sensor frequency. It is set by the CHx_RCOUNT register for the channel. The conversion time for any channel x is: tCx = (CHx_RCOUNT ˣ 16 + 4) /fREFx (5) The reference count value must be chosen to support the required number of effective bits (ENOB). For example, if an ENOB of 13 bits is required, then a minimum conversion time of 213 = 8192 clock cycles is required. 8192 clock cycles correspond to a CHx_RCOUNT value of 0x0200. Table 6. Conversion Time Configuration Registers, Channels 0 - 3 (1) CHANNEL (1) REGISTER FIELD [ BIT(S) ] CONVERSION TIME 0 RCOUNT_CH0, addr 0x08 CH0_RCOUNT [15:0] (CH0_RCOUNT*16)/fREF0 1 RCOUNT_CH1, addr 0x09 CH1_RCOUNT [15:0] (CH1_RCOUNT*16)/fREF1 2 RCOUNT_CH2, addr 0x0A CH2_RCOUNT [15:0] (CH2_RCOUNT*16)/fREF2 3 RCOUNT_CH3, addr 0x0B CH3_RCOUNT [15:0] (CH3_RCOUNT*16)/fREF3 Channels 2 and 3 are available only for FDC2114 and FDC2214. The typical channel switch delay time between the end of conversion and the beginning of sensor activation of the subsequent channel is: Channel Switch Delay = 692 ns + 5 / fref (6) The deterministic conversion time of the FDC allows data polling at a fixed interval. For example, if the programmed RCOUNT setting is 512 FREF cycles and SETTLECOUNT is 128 FREF cycles, then one conversion takes 1.8ms (sensor-activation time) + 3.2ms (conversion time) + 0.75ms (channel-switch delay) = 16.75ms per channel. If the FDC is configured for dual-channel operation by setting AUTOSCAN_EN = 1 and RR_SEQUENCE = 00, then one full set of conversion results will be available from the data registers every 33.5ms. A data ready flag (DRDY) is also available for interrupt driven system designs (see the STATUS register description in Register Maps). 9.3.2.1 Gain and Offset (FDC2112, FDC2114 only) The FDC2112 and FDC2114 have internal 16-bit data converters, but the standard conversion output word width is only 12 bits; therefore only 12 of the 16 bits are available from the data registers. By default, the gain feature is disabled and the DATA registers contain the 12 MSBs of the 16-bit word. However, it is possible to shift the data output by up to 4 bits. Figure 15 illustrates the segment of the 16-bit sample that is reported for each possible gain setting. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 17 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com MSB Conversion result LSB 15 12 Output_gain = 0x3 8 7 4 3 0 11 Output_gain = 0x2 0 11 Output_gain = 0x1 Output_gain = 0x0 (default) 11 0 11 0 11 0 11 0 Data available in DATA_MSB_CHx.DATA_CHx [11:0] Figure 15. Conversion Data Output Gain For systems in which the sensor signal variation is less than 25% of the full-scale range, the FDC can report conversion results with higher resolution by setting the Output Gain. The Output Gain is applied to all device channels. An output gain can be used to apply a 2-bit, 3-bit, or 4-bit shift to the output code for all channels, allowing access to the 4 LSBs of the original 16-bit result. The MSBs of the sample are shifted out when a gain is applied. Do not use the output gain if the MSBs of any active channel are toggling, as the MSBs for that channel will be lost when gain is applied. Example: If the conversion result for a channel is 0x07A3, with OUTPUT_GAIN=0x0, the reported output code is 0x07A. If OUTPUT_GAIN is set to 0x3 in the same condition, then the reported output code is 0x7A3. The original 4 MSBs (0x0) are no longer accessible. Table 7. Output Gain Register (FDC2112 and FDC2114 only) CHANNEL (1) All (1) REGISTER FIELD [ BIT(S) ] RESET_DEV, addr 0x1C OUTPUT_GAIN [ 10:9 ] EFFECTIVE RESOLUTION (BITS) OUTPUT RANGE 00 (default): Gain =1 (0 bits shift) 12 100% full scale 01: Gain = 4 (2 bits left shift) 14 25% full scale 10: Gain = 8 (3 bits left shift) 15 12.5% full scale 11 : Gain = 16 (4 bits left shift) 16 6.25% full scale VALUES Channels 2 and 3 are available for FDC2114 only. An offset value may be subtracted from each DATA value to compensate for a frequency offset or maximize the dynamic range of the sample data. The offset values should be < fSENSORx_MIN / fREFx. Otherwise, the offset might be so large that it masks the LSBs which are changing. 18 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 8. Frequency Offset Registers CHANNEL ( REGISTER 1) (1) FIELD [ BIT(S) ] VALUE 0 OFFSET_CH0, addr 0x0C CH0_OFFSET [ 15:0 ] fOFFSET0 = CH0_OFFSET * (fREF0/216) 1 OFFSET_CH1, addr 0x0D CH1_OFFSET [ 15:0 ] fOFFSET1 = CH1_OFFSET * (fREF1/216) 2 OFFSET_CH2, addr 0x0E CH2_OFFSET [ 15:0 ] fOFFSET2 = CH2_OFFSET * (fREF2/216) 3 OFFSET_CH3, addr 0x0F CH3_OFFSET [ 15:0 ] fOFFSET3 = CH3_OFFSET * (fREF3/216) Channels 2 and 3 are only available for FDC2114 and FDC2214. The sensor capacitance CSENSE of a differential sensor configuration can be determined by: 1 CSENSOR C L (2S ¦SENSORx 2 where • C = parallel sensor capacitance (see Figure 55) (7) The FDC2112 and FDC2114 sensor frequency fSENSORx can be determined by: ¦SENSORx CHxOFFSET · DATAx § CHx_FIN_SEL ¦REFx ¨ (12OUTPUT_GAIN) ¸ 216 ©2 ¹ where • • • DATAx = Conversion result from the DATA_CHx register CHx_OFFSET = Offset value set in the OFFSET_CHx register OUTPUT_GAIN = output multiplication factor set in the RESET_DEVICE.OUTPUT_GAIN register (8) The FDC2212 and FDC2214 sensor frequency fSENSORx can be determined by: CHx_FIN_SEL ¦REFx '$7$x ¦SENSORx (FDC2212, FDC2214) 228 where • DATAx = Conversion result from the DATA_CHx register (9) 9.3.3 Current Drive Control Registers The registers listed in Table 9 are used to control the sensor drive current. The recommendations listed in the last column of the table should be followed. Table 9. Current Drive Control Registers CHANNEL (1) REGISTER FIELD [ BIT(S) ] CONFIG, addr 0x1A SENSOR_ACTIVATE_SEL [11] Sets current drive for sensor activation. Recommended value is b0 (Full Current mode). CONFIG, addr 0x1A HIGH_CURRENT_DRV [6] b0 = normal current drive (1.5 mA) b1 = Increased current drive (> 1.5 mA) for Ch 0 in single channel mode only. Cannot be used in multi-channel mode. All 0 DRIVE_CURRENT_CH0, addr 0x1E CH0_IDRIVE [15:11] Drive current used during the settling and conversion time for Ch. 0. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V DRIVE_CURRENT_CH1, addr 0x1F CH1_IDRIVE [15:11] Drive current used during the settling and conversion time for Ch. 1. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V 0 1 (1) VALUE Channels 2 and 3 are available for FDC2114 and FDC2214 only. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 19 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table 9. Current Drive Control Registers (continued) CHANNEL (1) REGISTER FIELD [ BIT(S) ] VALUE DRIVE_CURRENT_CH2, addr 0x20 CH2_IDRIVE [15:11] Drive current used during the settling and conversion time for Ch. 2. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V DRIVE_CURRENT_CH3, addr 0x21 CH3_IDRIVE [15:11] Drive current used during the settling and conversion time for Ch. 3 . Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V 2 3 The CHx_IDRIVE field should be programmed such that the sensor oscillates at an amplitude between 1.2Vpk (VSENSORMIN) and 1.8Vpk (VSENSORMAX). An IDRIVE value of 00000 corresponds to 16 µA, and IDRIVE = b11111 corresponds to 1563 µA. A high sensor current drive mode can be enabled to drive sensor coils with > 1.5mA on channel 0, only in single channel mode. This feature can be used when the sensor minimum recommended oscillation amplitude of 1.2V cannot be achieved with the highest IDRIVE setting. Set the HIGH_CURRENT_DRV register bit to b1 to enable this mode. 9.3.4 Device Status Registers The registers listed in Table 10 may be used to read device status. Table 10. Status Registers CHANNEL (1) (1) REGISTER FIELDS [ BIT(S) ] VALUES All STATUS, addr 0x18 Refer to Register Maps section 12 fields are available that for a description of the individual contain various status bits [ 15:0 ] status bits. All STATUS_CONFIG, addr 0x19 12 fields are available that are Refer to Register Maps section used to configure status reporting for a description of the individual [ 15:0 ] error configuration bits. Channels 2 and 3 are available for FDC2114 and FDC2114 only. See the STATUS and STATUS_CONFIG register description in the Register Map section. These registers can be configured to trigger an interrupt on the INTB pin for certain events. The following conditions must be met: 1. The error or status register must be unmasked by enabling the appropriate register bit in the STATUS_CONFIG register 2. The INTB function must be enabled by setting CONFIG.INTB_DIS to 0 When a bit field in the STATUS register is set, the entire STATUS register content is held until read or until the DATA_CHx register is read. Reading also de-asserts INTB. Interrupts are cleared by one of the following events: 1. Entering Sleep Mode 2. Power-on reset (POR) 3. Device enters Shutdown Mode (SD is asserted) 4. S/W reset 5. I2C read of the STATUS register: Reading the STATUS register will clear any error status bit set in STATUS along with the ERR_CHAN field and de-assert INTB Setting register CONFIG.INTB_DIS to b1 disables the INTB function and holds the INTB pin high. 9.3.5 Input Deglitch Filter The input deglitch filter suppresses EMI and ringing above the sensor frequency. It does not impact the conversion result as long as its bandwidth is configured to be above the maximum sensor frequency. The input deglitch filter can be configured in MUX_CONFIG.DEGLITCH register field as shown in Table 11. For optimal performance, it is recommended to select the lowest setting that exceeds the sensor oscillation frequency. For example, if the maximum sensor frequency is 2.0 MHz, choose MUX_CONFIG.DEGLITCH = b100 (3.3 MHz). 20 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 11. Input Deglitch Filter Register (1) CHANNEL (1) MUX_CONFIG.DEGLITCH (addr 0x1B) REGISTER VALUE DEGLITCH FREQUENCY ALL 001 1 MHz ALL 100 3.3 MHz ALL 101 10 MHz ALL 011 33 MHz Channels 2 and 3 are available for FDC2114 / FDC2214 only. 9.4 Device Functional Modes 9.4.1 Start-up Mode When the FDC powers up, it enters into Sleep Mode and will wait for configuration. Once the device is configured, exit Sleep Mode by setting CONFIG.SLEEP_MODE_EN to b0. It is recommended to configure the FDC while in Sleep Mode. If a setting on the FDC needs to be changed, return the device to Sleep Mode, change the appropriate register, and then exit Sleep Mode. 9.4.2 Normal (Conversion) Mode When operating in the normal (conversion) mode, the FDC is periodically sampling the frequency of the sensor(s) and generating sample outputs for the active channel(s). 9.4.3 Sleep Mode Sleep Mode is entered by setting the CONFIG.SLEEP_MODE_EN register field to 1. While in this mode, the register contents are maintained. To exit Sleep Mode, set the CONFIG.SLEEP_MODE_EN register field to 0. After setting CONFIG.SLEEP_MODE_EN to b0, sensor activation for the first conversion will begin after 16,384 fINT clock cycles. While in Sleep Mode the I2C interface is functional so that register reads and writes can be performed. While in Sleep Mode, no conversions are performed. In addition, entering Sleep Mode will clear any error condition and de-assert the INTB pin. 9.4.4 Shutdown Mode When the SD pin is set to high, the FDC will enter Shutdown Mode. Shutdown Mode is the lowest power state. To exit Shutdown Mode, set the SD pin to low. Entering Shutdown Mode will return all registers to their default state. While in Shutdown Mode, no conversions are performed. In addition, entering Shutdown Mode will clear any error condition and de-assert the INTB pin. While the device is in Shutdown Mode, is not possible to read to or write from the device via the I2C interface. 9.4.4.1 Reset The FDC can be reset by writing to RESET_DEV.RESET_DEV. Conversion will stop and all register values will return to their default value. This register bit will always return 0b when read. 9.5 Programming The FDC device uses an I2C interface to access control and data registers. 9.5.1 I2C Interface Specifications The FDC uses an extended start sequence with I2C for register access. The maximum speed of the I2C interface is 400 kbit/s. This sequence follows the standard I2C 7-bit slave address followed by an 8-bit pointer register byte to set the register address. When the ADDR pin is set low, the FDC I2C address is 0x2A; when the ADDR pin is set high, the FDC I2C address is 0x2B. The ADDR pin must not change state after the FDC exits Shutdown Mode. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 21 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Programming (continued) 1 9 1 9 SCL A6 SDA A5 A4 A3 A2 A1 A0 R/W Start by Master R7 R6 R5 Ack by Slave Frame 1 Serial Bus Address Byte from Master 1 9 R4 R3 R2 R1 R0 Ack by Slave Frame 2 Slave Register Address 1 9 SCL D15 D14 D13 D12 D11 D10 D9 SDA D8 D7 D6 D5 Ack by Slave Frame 3 Data MSB from Master D4 D3 D2 D1 D0 Ack by Slave Frame 4 Data LSB from Master Stop by Master Figure 16. I2C Write Register Sequence 1 9 1 9 SCL A6 SDA A5 A4 A3 A2 A1 A0 R/W Start by Master R7 Ack by Slave Frame 1 Serial Bus Address Byte from Master 1 R6 R5 R4 R3 R2 R1 R0 Ack by Slave Frame 2 Slave Register Address 1 9 9 1 9 SCL A6 SDA A5 A4 A3 A2 A1 A0 R/W Start by Master D15 D14 D13 D12 D11 D10 D9 Ack by Slave Frame 3 Serial Bus Address Byte from Master Frame 4 Data MSB from Slave D8 D7 D6 D5 Ack by Master D4 D3 D2 Frame 5 Data LSB from Slave D1 D0 Nack by Stop by Master Master Figure 17. I2C Read Register Sequence 9.6 Register Maps 9.6.1 Register List Fields indicated with Reserved must be written only with indicated values. Improper device operation may occur otherwise. The R/W column indicates the Read-Write status of the corresponding field. A ‘R/W’ entry indicates read and write capability, a ‘R’ indicates read-only, and a ‘W’ indicates write-only. Figure 18. Register List ADDRESS 0x00 NAME DATA_CH0 0x01 DATA_LSB_CH0 0x02 DATA_CH1 0x03 DATA_LSB_CH1 0x04 DATA_CH2 0x05 DATA_LSB_CH2 22 DEFAULT VALUE DESCRIPTION 0x0000 Channel 0 Conversion Result and status (FDC2112 / FDC2114 only) 0x0000 Channel 0 MSB Conversion Result and status (FDC2212 / FDC2214 only) 0x0000 Channel 0 LSB Conversion Result. Must be read after Register address 0x00 (FDC2212 / FDC2214 only) 0x0000 Channel 1 Conversion Result and status (FDC2112 / FDC2114 only) 0x0000 Channel 1 MSB Conversion Result and status (FDC2212 / FDC2214 only) 0x0000 Channel 1 LSB Conversion Result. Must be read after Register address 0x02 (FDC2212 / FDC2214 only) 0x0000 Channel 2 Conversion Result and status (FDC2114 only) 0x0000 Channel 2 MSB Conversion Result and status (FDC2214 only) 0x0000 Channel 2 LSB Conversion Result. Must be read after Register address 0x04 (FDC2214 only) Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 ADDRESS 0x06 NAME DATA_CH3 0x07 DATA_LSB_CH3 0x08 0x09 0x0A 0x0B 0x0C 0x0D 0x0E 0x0F 0x10 0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1A 0x1B 0x1C 0x1E 0x1F 0x20 0x21 0x7E 0x7F RCOUNT_CH0 RCOUNT_CH1 RCOUNT_CH2 RCOUNT_CH3 OFFSET_CH0 OFFSET_CH1 OFFSET_CH2 OFFSET_CH3 SETTLECOUNT_CH0 SETTLECOUNT_CH1 SETTLECOUNT_CH2 SETTLECOUNT_CH3 CLOCK_DIVIDERS_CH0 CLOCK_DIVIDERS_CH1 CLOCK_DIVIDERS_CH2 CLOCK_DIVIDERS_CH3 STATUS STATUS_CONFIG CONFIG MUX_CONFIG RESET_DEV DRIVE_CURRENT_CH0 DRIVE_CURRENT_CH1 DRIVE_CURRENT_CH2 DRIVE_CURRENT_CH3 MANUFACTURER_ID DEVICE_ID DEFAULT VALUE DESCRIPTION 0x0000 Channel 3 Conversion Result and status (FDC2114 only) 0x0000 Channel 3 MSB Conversion Result and status (FDC2214 only) 0x0000 Channel 3 LSB Conversion Result. Must be read after Register address 0x06 (FDC2214 only) 0x0080 Reference Count setting for Channel 0 0x0080 Reference Count setting for Channel 1 0x0080 Reference Count setting for Channel 2 (FDC2114 / FDC2214 only) 0x0080 Reference Count setting for Channel 3 (FDC2114 / FDC2214 only) 0x0000 Offset value for Channel 0 (FDC2112 / FDC2114 only) 0x0000 Offset value for Channel 1 (FDC2112 / FDC2114 only) 0x0000 Offset value for Channel 2 (FDC2114 only) 0x0000 Offset value for Channel 3 (FDC2114 only) 0x0000 Channel 0 Settling Reference Count 0x0000 Channel 1 Settling Reference Count 0x0000 Channel 2 Settling Reference Count (FDC2114 / FDC2214 only) 0x0000 Channel 3 Settling Reference Count (FDC2114 / FDC2214 only) 0x0000 Reference divider settings for Channel 0 0x0000 Reference divider settings for Channel 1 0x0000 Reference divider settings for Channel 2 (FDC2114 / FDC2214 only) 0x0000 Reference divider settings for Channel 3 (FDC2114 / FDC2214 only) 0x0000 Device Status Reporting 0x0000 Device Status Reporting Configuration 0x2801 Conversion Configuration 0x020F Channel Multiplexing Configuration 0x0000 Reset Device 0x0000 Channel 0 sensor current drive configuration 0x0000 Channel 1 sensor current drive configuration 0x0000 Channel 2 sensor current drive configuration (FDC2114 / FDC2214 only) 0x0000 Channel 3 sensor current drive configuration (FDC2114 / FDC2214 only) 0x5449 Manufacturer ID 0x3054 Device ID (FDC2112, FDC2114 only) 0x3055 Device ID (FDC2212, FDC2214 only) 9.6.2 Address 0x00, DATA_CH0 Figure 19. Address 0x00, DATA_CH0 15 14 RESERVED 7 13 CH0_ERR_WD 12 CH0_ERR_AW 11 5 4 3 6 10 9 8 1 0 DATA0 2 DATA0 Table 12. Address 0x00, DATA_CH0 Field Descriptions Bit Field Type Reset Description RESERVED R 00 Reserved. 13 CH0_ERR_WD R 0 Channel 0 Conversion Watchdog Timeout Error Flag. Cleared by reading the bit. 12 CH0_ERR_AW R 0 Channel 0 Amplitude Warning. Cleared by reading the bit. DATA0 (FDC2112 / FDC2114 only) R 0000 0000 Channel 0 Conversion Result 0000 15:14 11:0 DATA0[27:16] (FDC2212 / FDC2214 only) Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 23 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 9.6.3 Address 0x01, DATA_LSB_CH0 (FDC2212 / FDC2214 only) Figure 20. Address 0x01, DATA_LSB_CH0 15 14 13 12 11 10 9 8 3 2 1 0 9 8 1 0 DATA0 7 6 5 4 DATA0 Table 13. Address 0x01, DATA_CH0 Field Descriptions Bit 15:0 Field Type Reset DATA0[15:0] R 0000 0000 Channel 0 Conversion Result 0000 Description 9.6.4 Address 0x02, DATA_CH1 Figure 21. Address 0x02, DATA_CH1 15 14 RESERVED 7 13 CH1_ERR_WD 12 CH1_ERR_AW 11 5 4 3 6 10 DATA1 2 DATA1 Table 14. Address 0x02, DATA_CH1 Field Descriptions Bit 15:14 Field Type Reset Description RESERVED R 00 Reserved. 13 CH1_ERR_WD R 0 Channel 1 Conversion Watchdog Timeout Error Flag. Cleared by reading the bit. 12 CH1_ERR_AW R 0 Channel 1 Amplitude Warning. Cleared by reading the bit. DATA1 (FDC2112 / FDC2114 only) R 0000 0000 Channel 1 Conversion Result 0000 11:0 DATA1[27:16] (FDC2212 / FDC2214 only) 9.6.5 Address 0x03, DATA_LSB_CH1 (FDC2212 / FDC2214 only) Figure 22. Address 0x03, DATA_LSB_CH1 15 14 13 12 11 10 9 8 3 2 1 0 9 8 1 0 DATA1 7 6 5 4 DATA1 Table 15. Address 0x03, DATA_CH1 Field Descriptions Bit 15:0 Field Type Reset Description DATA1[15:0] R 0000 0000 Channel 1 Conversion Result 0000 9.6.6 Address 0x04, DATA_CH2 (FDC2114, FDC2214 only) Figure 23. Address 0x04, DATA_CH2 15 14 RESERVED 7 13 CH2_ERR_WD 12 CH2_ERR_AW 11 5 4 3 6 10 DATA2 2 DATA2 24 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 16. Address 0x04, DATA_CH2 Field Descriptions Bit Field Type Reset Description RESERVED R 00 Reserved. 13 CH2_ERR_WD R 0 Channel 2 Conversion Watchdog Timeout Error Flag. Cleared by reading the bit. 12 CH2_ERR_AW R 0 Channel 2 Amplitude Warning. Cleared by reading the bit. DATA2 (FDC2112 / FDC2114 only) R 0000 0000 Channel 2 Conversion Result 0000 15:14 11:0 DATA2[27:16] (FDC2212 / FDC2214 only) 9.6.7 Address 0x05, DATA_LSB_CH2 (FDC2214 only) Figure 24. Address 0x05, DATA_LSB_CH2 15 14 13 12 11 10 9 8 3 2 1 0 9 8 1 0 DATA2 7 6 5 4 DATA2 Table 17. Address 0x05, DATA_CH2 Field Descriptions Bit 15:0 Field Type Reset DATA2[15:0] R 0000 0000 Channel 2 Conversion Result 0000 Description 9.6.8 Address 0x06, DATA_CH3 (FDC2114, FDC2214 only) Figure 25. Address 0x06, DATA_CH3 15 14 RESERVED 7 13 CH3_ERR_WD 12 CH3_ERR_AW 11 5 4 3 6 10 DATA3 2 DATA3 Table 18. Address 0x06, DATA_CH3 Field Descriptions Bit Field Type Reset Description RESERVED R 00 Reserved. 13 CH3_ERR_WD R 0 Channel 3 Conversion Watchdog Timeout Error Flag. Cleared by reading the bit. 12 CH3_ERR_AW R 0 Channel 3 Amplitude Warning. Cleared by reading the bit. DATA3 (FDC2112 / FDC2114 only) R 0000 0000 Channel 3 Conversion Result 0000 15:14 11:0 DATA3[27:16] (FDC2212 / FDC2214 only) 9.6.9 Address 0x07, DATA_LSB_CH3 (FDC2214 only) Figure 26. Address 0x07, DATA_LSB_CH3 15 14 13 12 11 10 9 8 3 2 1 0 DATA3 7 6 5 4 DATA3 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 25 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table 19. Address 0x07, DATA_CH3 Field Descriptions Bit 15:0 Field Type Reset DATA3[15:0] R 0000 0000 Channel 3 Conversion Result 0000 Description 9.6.10 Address 0x08, RCOUNT_CH0 Figure 27. Address 0x08, RCOUNT_CH0 15 14 13 12 11 CH0_RCOUNT 10 9 8 7 6 5 4 2 1 0 3 CH0_RCOUNT Table 20. Address 0x08, RCOUNT_CH0 Field Descriptions Bit 15:0 Field Type Reset Description CH0_RCOUNT R/W 0000 0000 1000 0000 Channel 0 Reference Count Conversion Interval Time 0x0000-0x00FF: Reserved 0x0100-0xFFFF: Conversion Time (tC0) = (CH0_RCOUNTˣ16)/fREF0 9.6.11 Address 0x09, RCOUNT_CH1 Figure 28. Address 0x09, RCOUNT_CH1 15 14 13 12 11 CH1_RCOUNT 10 9 8 7 6 5 4 2 1 0 3 CH1_RCOUNT Table 21. Address 0x09, RCOUNT_CH1 Field Descriptions Bit 15:0 Field Type Reset Description CH1_RCOUNT R/W 0000 0000 1000 0000 Channel 1 Reference Count Conversion Interval Time 0x0000-0x00FF: Reserved 0x0100-0xFFFF: Conversion Time (tC1)= (CH1_RCOUNTˣ16)/fREF1 9.6.12 Address 0x0A, RCOUNT_CH2 (FDC2114, FDC2214 only) Figure 29. Address 0x0A, RCOUNT_CH2 15 14 13 12 11 CH2_RCOUNT 10 9 8 7 6 5 4 2 1 0 3 CH2_RCOUNT Table 22. Address 0x0A, RCOUNT_CH2 Field Descriptions Bit 15:0 26 Field Type Reset Description CH2_RCOUNT R/W 0000 0000 1000 0000 Channel 2 Reference Count Conversion Interval Time 0x0000-0x00FF: Reserved 0x0100-0xFFFF: Conversion Time (tC2)= (CH2_RCOUNTˣ16)/fREF2 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 9.6.13 Address 0x0B, RCOUNT_CH3 (FDC2114, FDC2214 only) Figure 30. Address 0x0B, RCOUNT_CH3 15 14 13 12 11 CH3_RCOUNT 10 9 8 7 6 5 4 2 1 0 3 CH3_RCOUNT Table 23. Address 0x0B, RCOUNT_CH3 Field Descriptions Bit 15:0 Field Type Reset Description CH3_RCOUNT R/W 0000 0000 1000 0000 Channel 3 Reference Count Conversion Interval Time 0x0000-0x00FF: Reserved 0x0100-0xFFFF: Conversion Time (tC3)= (CH3_RCOUNTˣ16)/fREF3 9.6.14 Address 0x0C, OFFSET_CH0 (FDC21112 / FDC2114 only) Figure 31. Address 0x0C, CH0_OFFSET 15 14 13 12 11 10 9 8 3 2 1 0 CH0_OFFSET 7 6 5 4 CH0_OFFSET Table 24. CH0_OFFSET Field Descriptions Bit 15:0 Field Type Reset Description CH0_OFFSET R/W 0000 0000 0000 0000 Channel 0 Conversion Offset. fOFFSET_0 = (CH0_OFFSET/216)*fREF0 9.6.15 Address 0x0D, OFFSET_CH1 (FDC21112 / FDC2114 only) Figure 32. Address 0x0D, OFFSET_CH1 15 14 13 12 11 10 9 8 3 2 1 0 CH1_OFFSET 7 6 5 4 CH1_OFFSET Table 25. Address 0x0D, OFFSET_CH1 Field Descriptions Bit 15:0 Field Type Reset Description CH1_OFFSET R/W 0000 0000 0000 0000 Channel 1 Conversion Offset. fOFFSET_1 = (CH1_OFFSET/216)*fREF1 9.6.16 Address 0x0E, OFFSET_CH2 (FDC2114 only) Figure 33. Address 0x0E, OFFSET_CH2 15 14 13 12 11 10 9 8 3 2 1 0 CH2_OFFSET 7 6 5 4 CH2_OFFSET Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 27 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table 26. Address 0x0E, OFFSET_CH2 Field Descriptions Bit 15:0 Field Type Reset Description CH2_OFFSET R/W 0000 0000 0000 0000 Channel 2 Conversion Offset. fOFFSET_2 = (CH2_OFFSET/216)*fREF2 9.6.17 Address 0x0F, OFFSET_CH3 (FDC2114 only) Figure 34. Address 0x0F, OFFSET_CH3 15 14 13 12 11 10 9 8 3 2 1 0 CH3_OFFSET 7 6 5 4 CH3_OFFSET Table 27. Address 0x0F, OFFSET_CH3 Field Descriptions Bit 15:0 Field Type Reset CH3_OFFSET R/W 0000 0000 Channel 3 Conversion Offset. fOFFSET_3 = 0000 0000 (CH3_OFFSET/216)*fREF3 Description 9.6.18 Address 0x10, SETTLECOUNT_CH0 Figure 35. Address 0x10, SETTLECOUNT_CH0 15 14 13 12 11 CH0_SETTLECOUNT 10 9 8 7 6 5 4 3 CH0_SETTLECOUNT 2 1 0 Table 28. Address 0x11, SETTLECOUNT_CH0 Field Descriptions Bit 15:0 Field Type Reset CH0_SETTLECOUNT R/W 0000 0000 Channel 0 Conversion Settling 0000 0000 The FDC will use this settling time to allow the LC sensor to stabilize before initiation of a conversion on Channel 0. If the amplitude has not settled prior to the conversion start, an Amplitude warning will be generated if reporting of this type of warning is enabled. b0000 0000 0000 0000: Settle Time (tS0)= 32 ÷ fREF0 b0000 0000 0000 0001: Settle Time (tS0)= 32 ÷ fREF0 b0000 0000 0000 0010 - b1111 1111 1111 1111: Settle Time (tS0)= (CH0_SETTLECOUNTˣ16) ÷ fREF0 Description 9.6.19 Address 0x11, SETTLECOUNT_CH1 Figure 36. Address 0x11, SETTLECOUNT_CH1 28 15 14 13 12 11 CH1_SETTLECOUNT 10 9 8 7 6 5 4 3 CH1_SETTLECOUNT 2 1 0 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 29. Address 0x12, SETTLECOUNT_CH1 Field Descriptions Bit 15:0 Field Type Reset CH1_SETTLECOUNT R/W 0000 0000 Channel 1 Conversion Settling 0000 0000 The FDC will use this settling time to allow the LC sensor to stabilize before initiation of a conversion on a Channel 1. If the amplitude has not settled prior to the conversion start, an Amplitude warning will be generated if reporting of this type of warning is enabled. b0000 0000 0000 0000: Settle Time (tS1)= 32 ÷ fREF1 b0000 0000 0000 0001: Settle Time (tS1)= 32 ÷ fREF1 b0000 0000 0000 0010 - b1111 1111 1111 1111: Settle Time (tS1)= (CH1_SETTLECOUNTˣ16) ÷ fREF1 Description 9.6.20 Address 0x12, SETTLECOUNT_CH2 (FDC2114, FDC2214 only) Figure 37. Address 0x12, SETTLECOUNT_CH2 15 14 13 12 11 CH2_SETTLECOUNT 10 9 8 7 6 5 4 3 CH2_SETTLECOUNT 2 1 0 Table 30. Address 0x12, SETTLECOUNT_CH2 Field Descriptions Bit 15:0 Field Type Reset CH2_SETTLECOUNT R/W 0000 0000 Channel 2 Conversion Settling 0000 0000 The FDC will use this settling time to allow the LC sensor to stabilize before initiation of a conversion on Channel 2. If the amplitude has not settled prior to the conversion start, an Amplitude warning will be generated if reporting of this type of warning is enabled. b0000 0000 0000 0000: Settle Time (tS2)= 32 ÷ fREF2 b0000 0000 0000 0001: Settle Time (tS2)= 32 ÷ fREF2 b0000 0000 0000 0010 - b1111 1111 1111 1111: Settle Time (tS2)= (CH2_SETTLECOUNTˣ16) ÷ fREF2 Description 9.6.21 Address 0x13, SETTLECOUNT_CH3 (FDC2114, FDC2214 only) Figure 38. Address 0x13, SETTLECOUNT_CH3 15 14 13 12 11 CH3_SETTLECOUNT 10 9 8 7 6 5 4 3 CH3_SETTLECOUNT 2 1 0 Table 31. Address 0x13, SETTLECOUNT_CH3 Field Descriptions Bit 15:0 Field Type Reset CH3_SETTLECOUNT R/W 0000 0000 Channel 3 Conversion Settling 0000 0000 The FDC will use this settling time to allow the LC sensor to stabilize before initiation of a conversion on Channel 3. If the amplitude has not settled prior to the conversion start, an Amplitude warning will be generated if reporting of this type of warning is enabled b0000 0000 0000 0000: Settle Time (tS3)= 32 ÷ fREF3 b0000 0000 0000 0001: Settle Time (tS3)= 32 ÷ fREF3 b0000 0000 0000 0010 - b1111 1111 1111 1111: Settle Time (tS3)= (CH3_SETTLECOUNTˣ16) ÷ fREF3 Copyright © 2015, Texas Instruments Incorporated Description Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 29 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 9.6.22 Address 0x14, CLOCK_DIVIDERS_CH0 Figure 39. Address 0x14, CLOCK_DIVIDERS_CH0 15 14 13 RESERVED 7 12 11 CH0_FIN_SEL 6 5 10 RESERVED 4 3 CH0_FREF_DIVIDER 2 9 8 CH0_FREF_DIVIDER 1 0 Table 32. Address 0x14, CLOCK_DIVIDERS_CH0 Field Descriptions Bit 15:14 Field Type Reset Description RESERVED R/W 00 Reserved. Set to b00. 00 Channel 0 Sensor frequency select for differential sensor configuration: b01: divide by 1. Choose for sensor frequencies between 0.01MHz and 8.75MHz b10: divide by 2. Choose for sensor frequencies between 5MHz and 10MHz for single-ended sensor configuration: b10: divide by 2. Choose for sensor frequencies between 0.01MHz and 10MHz 00 Reserved. Set to b00. 00 0000 0000 Channel 0 Reference Divider Sets the divider for Channel 0 reference. Use this to scale the maximum conversion frequency. b00’0000’0000: Reserved. Do not use. CH0_FREF_DIVIDER≥b00’0000’0001: fREF0 = fCLK/CH0_FREF_DIVIDER 13:12 CH0_FIN_SEL R/W 11:10 RESERVED R/W 9:0 CH0_FREF_DIVIDER R/W 9.6.23 Address 0x15, CLOCK_DIVIDERS_CH1 Figure 40. Address 0x15, CLOCK_DIVIDERS_CH1 15 14 13 RESERVED 7 12 11 CH1_FIN_SEL 6 5 10 RESERVED 4 3 CH1_FREF_DIVIDER 2 9 8 CH1_FREF_DIVIDER 1 0 Table 33. Address 0x15, CLOCK_DIVIDERS_CH1 Field Descriptions Bit 15:14 Type Reset Description RESERVED R/W 00 Reserved. Set to b00. 0000 Channel 1 Sensor frequency select for differential sensor configuration: b01: divide by 1. Choose for sensor frequencies between 0.01MHz and 8.75MHz b10: divide by 2. Choose for sensor frequencies between 5MHz and 10MHz for single-ended sensor configuration: b10: divide by 2. Choose for sensor frequencies between 0.01MHz and 10MHz 00 Reserved. Set to b00. 00 0000 0000 Channel 1 Reference Divider Sets the divider for Channel 1 reference. Use this to scale the maximum conversion frequency. b00’0000’0000: Reserved. Do not use. CH1_FREF_DIVIDER≥ b00’0000’0001: fREF1 = fCLK/CH1_FREF_DIVIDER 13:12 CH1_FIN_SEL R/W 11:10 RESERVED R/W 9:0 30 Field CH1_FREF_DIVIDER R/W Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 9.6.24 Address 0x16, CLOCK_DIVIDERS_CH2 (FDC2114, FDC2214 only) Figure 41. Address 0x16, CLOCK_DIVIDERS_CH2 15 14 13 RESERVED 7 12 11 CH2_FIN_SEL 6 5 10 9 8 CH2_FREF_DIVIDER RESERVED 4 3 CH2_FREF_DIVIDER 2 1 0 Table 34. Address 0x16, CLOCK_DIVIDERS_CH2 Field Descriptions Field Type Reset Description 15:14 Bit RESERVED R/W 00 Reserved. Set to b00. 13:12 CH2_FIN_SEL R/W 0000 Channel 2 Sensor frequency select for differential sensor configuration: b01: divide by 1. Choose for sensor frequencies between 0.01MHz and 8.75MHz b10: divide by 2. Choose for sensor frequencies between 5MHz and 10MHz for single-ended sensor configuration: b10: divide by 2. Choose for sensor frequencies between 0.01MHz and 10MHz 11:10 RESERVED R/W 00 Reserved. Set to b00. CH2_FREF_DIVIDER R/W 00 0000 0000 Channel 2 Reference Divider Sets the divider for Channel 2 reference. Use this to scale the maximum conversion frequency. b00’0000’0000: Reserved. Do not use. CH2_FREF_DIVIDER ≥ b00’0000’0001: fREF2 = fCLK/CH2_FREF_DIVIDER 9:0 9.6.25 Address 0x17, CLOCK_DIVIDERS_CH3 (FDC2114, FDC2214 only) Figure 42. Address 0x17, CLOCK_DIVIDERS_CH3 15 14 13 RESERVED 7 12 11 CH3_FIN_SEL 6 5 10 9 8 CH3_FREF_DIVIDER RESERVED 4 3 CH3_FREF_DIVIDER 2 1 0 Table 35. Address 0x17, CLOCK_DIVIDERS_CH3 Field Type Reset Description 15:14 Bit RESERVED R/W 00 Reserved. Set to b00. 13:12 CH3_FIN_SEL R/W 0000 Channel 3 Sensor frequency select for differential sensor configuration: b01: divide by 1. Choose for sensor frequencies between 0.01MHz and 8.75MHz b10: divide by 2. Choose for sensor frequencies between 5MHz and 10MHz for single-ended sensor configuration: b10: divide by 2. Choose for sensor frequencies between 0.01MHz and 10MHz 11:10 RESERVED R/W 00 Reserved. Set to b00. CH3_FREF_DIVIDER R/W 00 0000 0000 Channel 3 Reference Divider Sets the divider for Channel 3 reference. Use this to scale the maximum conversion frequency. b00’0000’0000: reserved CH3_FREF_DIVIDER ≥ b00’0000’0001: fREF3 = fCLK/CH3_FREF_DIVIDER 9:0 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 31 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 9.6.26 Address 0x18, STATUS Figure 43. Address 0x18, STATUS 15 14 13 ERR_CHAN 7 RESERVED 12 11 ERR_WD 4 3 CH0_UNREA DCONV RESERVED 6 DRDY 5 RESERVED 10 9 RESERVED 8 2 1 0 CH1_ CH2_ CH3_ UNREADCONV UNREADCONV UNREADCONV Table 36. Address 0x18, STATUS Field Descriptions Bit Field Type Reset Description 15:14 ERR_CHAN R 00 Error Channel Indicates which channel has generated a Flag or Error. Once flagged, any reported error is latched and maintained until either the STATUS register or the DATA_CHx register corresponding to the Error Channel is read. b00: Channel 0 is source of flag or error. b01: Channel 1 is source of flag or error. b10: Channel 2 is source of flag or error (FDC2114, FDC2214 only). b11: Channel 3 is source of flag or error (FDC2114, FDC2214 only). 13:12 RESERVED R 00 Reserved 11 ERR_WD R 0 Watchdog Timeout Error b0: No Watchdog Timeout error was recorded since the last read of the STATUS register. b1: An active channel has generated a Watchdog Timeout error. Refer to STATUS.ERR_CHAN field to determine which channel is the source of this error. 10 ERR_AHW R 0 Amplitude High Warning b0: No Amplitude High warning was recorded since the last read of the STATUS register. b1: An active channel has generated an Amplitude High warning. Refer to STATUS.ERR_CHAN field to determine which channel is the source of this warning. 9 ERR_ALW R 0 Amplitude Low Warning b0: No Amplitude Low warning was recorded since the last read of the STATUS register. b1: An active channel has generated an Amplitude Low warning. Refer to STATUS.ERR_CHAN field to determine which channel is the source of this warning. RESERVED R 00 Reserved 6 DRDY R 0 Data Ready Flag. b0: No new conversion result was recorded in the STATUS register. b1: A new conversion result is ready. When in Single Channel Conversion, this indicates a single conversion is available. When in sequential mode, this indicates that a new conversion result for all active channels is now available. 3 CH0_UNREADCONV R 0 Channel 0 Unread Conversion b0: No unread conversion is present for Channel 0. b1: An unread conversion is present for Channel 0. Read Register DATA_CH0 to retrieve conversion results. 2 CH1_ UNREADCONV R 0 Channel 1 Unread Conversion b0: No unread conversion is present for Channel 1. b1: An unread conversion is present for Channel 1. Read Register DATA_CH1 to retrieve conversion results. 1 CH2_ UNREADCONV R 0 Channel 2 Unread Conversion b0: No unread conversion is present for Channel 2. b1: An unread conversion is present for Channel 2. Read Register DATA_CH2 to retrieve conversion results (FDC2114, FDC2214 only) 8:7 32 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 36. Address 0x18, STATUS Field Descriptions (continued) Bit 0 Field Type Reset Description CH3_ UNREADCONV R 0 Channel 3 Unread Conversion b0: No unread conversion is present for Channel 3. b1: An unread conversion is present for Channel 3. Read Register DATA_CH3 to retrieve conversion results (FDC2114, FDC2214 only) 9.6.27 Address 0x19, ERROR_CONFIG Figure 44. Address 0x19, ERROR_CONFIG 15 14 13 WD_ ERR2OUT 6 5 WD_ERR2INT RESERVED 7 RESERVED 12 11 AH_WARN2OU AL_WARN2OU T T 4 3 10 9 RESERVED 8 2 1 0 DRDY_2INT RESERVED Table 37. Address 0x19, ERROR_CONFIG Bit 15:14 Field Type Reset Description RESERVED R/W 00 Reserved (set to b000) 13 WD_ ERR2OUT R/W 0 Watchdog Timeout Error to Output Register b0: Do not report Watchdog Timeout errors in the DATA_CHx registers. b1: Report Watchdog Timeout errors in the DATA_CHx.CHx_ERR_WD register field corresponding to the channel that generated the error. 12 AH_WARN2OUT R/W 0 Amplitude High Warning to Output Register b0:Do not report Amplitude High warnings in the DATA_CHx registers. b1: Report Amplitude High warnings in the DATA_CHx.CHx_ERR_AW register field corresponding to the channel that generated the warning. 11 AL_WARN2OUT R/W 0 Amplitude Low Warning to Output Register b0: Do not report Amplitude Low warnings in the DATA_CHx registers. b1: Report Amplitude High warnings in the DATA_CHx.CHx_ERR_AW register field corresponding to the channel that generated the warning. RESERVED R/W 0 0000 Reserved (set to b0 0000) WD_ERR2INT R/W 0 Watchdog Timeout Error to INTB b0: Do not report Under-range errors by asserting INTB pin and STATUS register. b1: Report Watchdog Timeout errors by asserting INTB pin and updating STATUS.ERR_WD register field. Reserved R/W 0000 Reserved (set to b000) DRDY_2INT R/W 0 Data Ready Flag to INTB b0: Do not report Data Ready Flag by asserting INTB pin and STATUS register. b1: Report Data Ready Flag by asserting INTB pin and updating STATUS. DRDY register field. 10:6 5 4:1 0 9.6.28 Address 0x1A, CONFIG Figure 45. Address 0x1A, CONFIG 15 14 ACTIVE_CHAN 7 6 13 SLEEP_MODE _EN 12 RESERVED 11 SENSOR_ACTI VATE_SEL 10 RESERVED 9 REF_CLK_SR C 8 RESERVED 5 4 3 2 1 0 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 33 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 INTB_DIS www.ti.com HIGH_CURRE NT_DRV RESERVED Table 38. Address 0x1A, CONFIG Field Descriptions Bit Field Type Reset Description ACTIVE_CHAN R/W 00 Active Channel Selection Selects channel for continuous conversions when MUX_CONFIG.SEQUENTIAL is 0. b00: Perform continuous conversions on Channel 0 b01: Perform continuous conversions on Channel 1 b10: Perform continuous conversions on Channel 2 (FDC2114, FDC2214 only) b11: Perform continuous conversions on Channel 3 (FDC2114, FDC2214 only) 13 SLEEP_MODE_EN R/W 1 Sleep Mode Enable Enter or exit low power Sleep Mode. b0: Device is active. b1: Device is in Sleep Mode. 12 RESERVED R/W 0 Reserved. Set to b1. 11 SENSOR_ACTIVATE_SEL R/W 1 Sensor Activation Mode Selection. Set the mode for sensor initialization. b0: Full Current Activation Mode – the FDC will drive maximum sensor current for a shorter sensor activation time. b1: Low Power Activation Mode – the FDC uses the value programmed in DRIVE_CURRENT_CHx during sensor activation to minimize power consumption. 10 RESERVED R/W 0 Reserved. Set to b1. 9 REF_CLK_SRC R/W 0 Select Reference Frequency Source b0: Use Internal oscillator as reference frequency b1: Reference frequency is provided from CLKIN pin. 8 RESERVED R/W 0 Reserved. Set to b0. 7 INTB_DIS R/W 0 INTB Disable b0: INTB pin will be asserted when status register updates. b1: INTB pin will not be asserted when status register updates 6 HIGH_CURRENT_DRV R/W 0 High Current Sensor Drive b0: The FDC will drive all channels with normal sensor current (1.5mA max). b1: The FDC will drive channel 0 with current >1.5mA. This mode is not supported if AUTOSCAN_EN = b1 (multichannel mode) RESERVED R/W 00 0001 Reserved Set to b00’0001 15:14 5:0 9.6.29 Address 0x1B, MUX_CONFIG Figure 46. Address 0x1B, MUX_CONFIG 15 AUTOSCAN_E N 7 14 13 RR_SEQUENCE 12 11 10 RESERVED 9 8 6 4 3 2 1 DEGLITCH 0 5 RESERVED Table 39. Address 0x1B, MUX_CONFIG Field Descriptions 34 Bit Field Type Reset Description 15 AUTOSCAN_EN R/W 0 Auto-Scan Mode Enable b0: Continuous conversion on the single channel selected by CONFIG.ACTIVE_CHAN register field. b1: Auto-Scan conversions as selected by MUX_CONFIG.RR_SEQUENCE register field. Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Table 39. Address 0x1B, MUX_CONFIG Field Descriptions (continued) Field Type Reset Description 14:13 Bit RR_SEQUENCE R/W 00 Auto-Scan Sequence Configuration Configure multiplexing channel sequence. The FDC will perform a single conversion on each channel in the sequence selected, and then restart the sequence continuously. b00: Ch0, Ch1 b01: Ch0, Ch1, Ch2 (FDC2114, FDC2214 only) b10: Ch0, Ch1, Ch2, Ch3 (FDC2114, FDC2214 only) b11: Ch0, Ch1 12:3 RESERVED R/W 00 0100 0001 Reserved. Must be set to 00 0100 0001 2:0 DEGLITCH R/W 111 Input deglitch filter bandwidth. Select the lowest setting that exceeds the oscillation tank oscillation frequency. b001: 1MHz b100: 3.3MHz b101: 10MHz b111: 33MHz 9.6.30 Address 0x1C, RESET_DEV Figure 47. Address 0x1C, RESET_DEV 15 RESET_DEV 14 7 6 13 12 11 10 9 OUTPUT_GAIN 3 2 RESERVED 5 4 8 RESERVED 1 0 RESERVED Table 40. Address 0x1C, RESET_DEV Field Descriptions Bit Field Type Reset Description 15 RESET_DEV R/W 0 Device Reset Write b1 to reset the device. Will always readback 0. 14:11 RESERVED R/W 0000 Reserved. Set to b0000 10:9 OUTPUT_GAIN R/W 00 Output gain control (FDC2112, FDC2114 only) 00: Gain =1 (0 bits shift) 01: Gain = 4 (2 bits shift) 10: Gain = 8 (3 bits shift) 11: Gain = 16 (4 bits shift) 8:0 RESERVED R/W 0 0000 0000 Reserved, Set to b0 0000 0000 9.6.31 Address 0x1E, DRIVE_CURRENT_CH0 Figure 48. Address 0x1E, DRIVE_CURRENT_CH0 15 14 13 CH0_IDRIVE 12 7 6 5 4 11 10 9 RESERVED 8 3 2 1 0 RESERVED Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 35 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table 41. Address 0x1E, DRIVE_CURRENT_CH0 Field Descriptions Field Type Reset Description 15:11 Bit CH0_IDRIVE R/W 0000 0 Channel 0 Sensor drive current This field defines the Drive Current used during the settling + conversion time of Channel 0 sensor clock. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V 00000: 0.016mA 00001: 0.018mA 00010: 0.021mA 00011: 0.025mA 00100: 0.028mA 00101: 0.033mA 00110: 0.038mA 00111: 0.044mA 01000: 0.052mA 01001: 0.060mA 01010: 0.069mA 01011: 0.081mA 01100: 0.093mA 01101: 0.108mA 01110: 0.126mA 01111: 0.146mA 10000: 0.169mA 10001: 0.196mA 10010: 0.228mA 10011: 0.264mA 10100: 0.307mA 10101: 0.356mA 10110: 0.413mA 10111: 0.479mA 11000: 0.555mA 11001: 0.644mA 11010: 0.747mA 11011: 0.867mA 11100: 1.006mA 11101: 1.167mA 11110: 1.354mA 11111: 1.571mA 10:0 RESERVED – 000 0000 0000 Reserved 9.6.32 Address 0x1F, DRIVE_CURRENT_CH1 Figure 49. Address 0x1F, DRIVE_CURRENT_CH1 15 14 13 CH1_IDRIVE 12 7 6 5 4 11 10 9 RESERVED 8 3 2 1 0 RESERVED Table 42. Address 0x1F, DRIVE_CURRENT_CH1 Field Descriptions Bit 36 Field Type Reset Description 15:11 CH1_IDRIVE R/W 0000 0 Channel 1 Sensor drive current This field defines the Drive Current used during the settling + conversion time of Channel 1 sensor clock. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V 00000: 0.016mA 00001: 0.018mA 00010: 0.021mA ... 11111: 1.571mA 10:0 RESERVED - 000 0000 0000 Reserved Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 9.6.33 Address 0x20, DRIVE_CURRENT_CH2 (FDC2114 / FDC2214 only) Figure 50. Address 0x20, DRIVE_CURRENT_CH2 15 14 13 CH2_IDRIVE 12 7 6 5 4 11 10 9 RESERVED 8 3 2 1 0 RESERVED Table 43. Address 0x20, DRIVE_CURRENT_CH2 Field Descriptions Field Type Reset Description 15:11 Bit CH2_IDRIVE R/W 0000 0 Channel 2 Sensor drive current This field defines the Drive Current to be used during the settling + conversion time of Channel 2 sensor clock. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V 00000: 0.016mA 00001: 0.018mA 00010: 0.021mA ... 11111: 1.571mA 10:0 RESERVED – 000 0000 0000 Reserved 9.6.34 Address 0x21, DRIVE_CURRENT_CH3 (FDC2114 / FDC2214 only) Figure 51. Address 0x21, DRIVE_CURRENT_CH3 15 14 13 CH3_IDRIVE 12 7 6 5 4 11 10 9 RESERVED 8 3 2 1 0 RESERVED Table 44. DRIVE_CURRENT_CH3 Field Descriptions Field Type Reset Description 15:11 Bit CH3_IDRIVE R/W 0000 0 Channel 3 Sensor drive current This field defines the Drive Current to be used during the settling + conversion time of Channel 3 sensor clock. Set such that 1.2V ≤ sensor oscillation amplitude (pk) ≤ 1.8V 00000: 0.016mA 00001: 0.018mA 00010: 0.021mA ... 11111: 1.571mA 10:0 RESERVED – 000 0000 0000 Reserved 9.6.35 Address 0x7E, MANUFACTURER_ID Figure 52. Address 0x7E, MANUFACTURER_ID 15 14 13 12 11 MANUFACTURER_ID 10 9 8 7 6 5 4 3 MANUFACTURER_ID 2 1 0 Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 37 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Table 45. Address 0x7E, MANUFACTURER_ID Field Descriptions Bit 15:0 Field Type Reset MANUFACTURER_ID R 0101 0100 Manufacturer ID = 0x5449 0100 1001 Description 9.6.36 Address 0x7F, DEVICE_ID Figure 53. Address 0x7F, DEVICE_ID 7 6 5 4 3 2 1 0 DEVICE_ID Table 46. Address 0x7F, DEVICE_ID Field Descriptions 38 Bit Field Type Reset 7:0 DEVICE_ID R 0011 0000 Device ID 0101 0100 0x3054 (FDC2112, FDC2114 only) 0x3055 (FDC2212, FDC2214 only) Submit Documentation Feedback Description Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 10 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 10.1 Application Information 10.1.1 Sensor Configuration The FDC supports two sensor configurations. Both configurations use an LC tank to set the frequency of oscillation. A typical choice is an 18 μH shielded SMD inductor in parallel with a 33 pF capacitor, which result in a 6.5 MHz oscillation frequency. In the single-ended configuration in Figure 54, a conductive plate is connected IN0A. Together with a target object, the conductive plate forms a variable capacitor. Target object Sensor plate FDC211x / FDC221x Virtual GND (target floating) or Earth GND (target grounded) IN0A L 18 H C 33 pF IN0B Figure 54. Single-ended Sensor Configuration In the differential sensor configuration in Figure 55, one conductive plate is connected to IN0A, and a second conductive plate is connected to IN0B. Together, they form a variable capacitor. When using an single-ended sensor configuration, set CHx_FIN_SEL to b10 (divide by 2). Target object FDC211x / FDC221x Sensor plate (1) IN0A Virtual GND (target floating) or Earth GND (target grounded) L 18 H C 33 pF IN0B Sensor plate (2) Figure 55. Differential Sensor Configuration The single-ended configuration allows higher sensing range than the differential configuration for a given total sensor plate area. In applications in which high sensitivity at close proximity is desired, the differential configuration performs better than the single-ended configuration. 10.1.2 Shield in order to minimize interference from external objects, some applications require an additional plate which acts as a shield. The shield can either be: • • actively driven shield: The shield is a buffered signal of the INxA pin. The signal is buffered by an external amplifier with a gain of 1. passive shield: The shield is connected to GND. Adding a passive shield decreases sensitivity of the sensor, but is dependent on the distance between the distance between the sensing plate and the shield. The Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 39 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Application Information (continued) distance between the sensing plate and the shield should be adjusted to achieve the required sensitivity 10.2 Typical Application The FDC can be used to measure liquid level in non-conductive containers. Due to its very high excitation rate capability, it is able to measure soapy water, ink, soap, and other conductive liquids. Capacitive sensors can be attached to the outside of the container or be located remotely from the container, allowing for contactless measurements. The working principle is based on a ratiometric measurement; Figure 56 shows a possible system implementation which uses three electrodes. The Level electrode provides a capacitance value proportional to the liquid level. The Reference Environmental electrode and the Reference Liquid electrode are used as references. The Reference Liquid electrode accounts for the liquid dielectric constant and its variation, while the Reference Environmental electrode is used to compensate for any other environmental variations that are not due to the liquid itself. Note that the Reference Environmental electrode and the Reference Liquid electrode are the same physical size (hREF). For this application, single-ended measurements on the active channels are appropriate, as the tank is grounded. Use to determine the liquid level from the measured capacitances: C CLev (0) Level href Lev CRL CRE where • • • • • CRE is the capacitance of the Reference Environmental electrode, CRL is the capacitance of the Reference Liquid electrode, CLev is the current value of the capacitance measured at the Level electrode sensor, CLev(0) is the capacitance of the Level electrode when the container is empty, and hREF is the height in the desired units of the Container or Liquid Reference electrodes. The ratio between the capacitance of the level and the reference electrodes allows simple calculation of the liquid level inside the container itself. Very high sensitivity values (that is, many LSB/mm) can be obtained due to the high resolution of the FDC2x1x, even when the sensors are located remotely from the container. Note that this approach assumes that the container has a uniform cross section from top to bottom, so that each incremental increase or decrease in the liquid represents a change in volume that is directly related to the height of the liquid. 40 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Typical Application (continued) 10.2.1 Schematic 3.3 V 3.3 V FDC2114 / FDC2214 VDD CLKIN 40 MHz VDD Int. Osc. GND Resonant circuit driver INTB 0.1 F 1 F IN0A LEVEL SENSOR L ENVIRONMENTAL SENSOR C IN0B SD C MCU Core IN1B GND ADDR IN1A L GPIO 3.3 V Cap Sensor 0 LIQUID SENSOR GPIO Resonant circuit driver I 2C I 2C peripheral SDA SCL Cap Sensor 1 IN2A L C IN2B Resonant circuit driver Cap Sensor 2 IN3A IN3B Resonant circuit driver Figure 56. FDC (Liquid Level Measurement) 10.2.2 Design Requirements The liquid level measurement should be independent of the liquid, which can be achieved using the 3-electrode design described above. Moreover, the sensor should be isolated from environmental interferers such as a human body, other objects, or EMI. 10.2.3 Detailed Design Procedure In capacitive sensing systems, the design of the sensor plays an important role in determining system performance and capabilities. In most cases the sensor is simply a metal plate that can be designed on the PCB. The sensor used in this example is implemented with a two-layer PCB. On the top layer, which faces the tank, there are the 3 electrodes (Reference Environmental, Reference Liquid, and Level) with a ground plane surrounding the electrodes. Depending on the shape of the container, the FDC can be located on the sensor PCB to minimize the length of the traces between the input channels and the sensors. In case the shape of the container or other mechanical constraints do not allow having the sensors and the FDC on the same PCB, the traces which connect the channels to the sensor need to be shielded with the appropriate shield. 10.2.3.1 Application Performance Plot A liquid level sensor with 3 electrodes like the one shown in the schematic was connected to the EVM. The plot shows the capacitance measured by Level sensor at different levels of liquid in the tank. The capacitance of the Reference Liquid and Reference Environmental sensors have a steady value because they experience consistent exposure to liquid and air, while the capacitance of the level sensor (Level) increases linearly with the height of the liquid in the tank. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 41 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Typical Application (continued) 4.7 4.65 4.6 4.55 Level (pF) 4.5 4.45 4.4 4.35 4.3 4.25 4.2 4.15 4.1 10 15 20 25 Level (mm) 30 35 40 D031 Figure 57. Electrodes' Capacitance vs. Liquid Level 10.2.3.2 Recommended Initial Register Configuration Values 1. 2. 3. 4. 5. 42 The application requires 100SPS ( TSAMPLE = 10 ms). A sensor with an 18µH inductor and a 33pF capacitor is used. Additional pin, trace, and wire capacitance accounts for 20pF, so the total capacitance is 53pF. Using L and C, fSENSOR = 1/2π√(LC) = 1/2π√(18*10-6 * 50*10-12) = 5.15 MHz. This represents the maximum sensor frequency. When the sensor capacitance is added, the frequency will decrease. Using a system master clock of 40 MHz applied to the CLKIN pin allows flexibility for setting the internal clock frequencies. The sensor coils are connected to channel 0 (IN0A and IN0B pins), channel 1 (IN1A and IN1B pins), and channel 2 (IN2A and IN2B pins). After powering on the FDC, it will be in Sleep Mode. Program the registers as follows (example sets registers for channel 0 only; channel 1 and channel 2 registers can use equivalent configuration): Set the dividers for channel 0. (a) Because the sensor is in an single-ended configuration, the sensor frequency select register should be set to 2, which means setting field CH0_FIN_SELto b10. (b) The design constraint for fREF0 is > 4 × fSENSOR. To satisfy this constraint, fREF0 must be greater than 20.6 MHz, so the reference divider should be set to 1. This is done by setting the CH0_FREF_DIVIDER field to 0x01. (c) The combined value for Chan. 0 divider register (0x14) is 0x2001. Sensor drive current: to ensure that the oscillation amplitude is between 1.2V and 1.8V, measure the oscillation amplitude on an oscilloscope and adjust the IDRIVE value, or use the integrated FDC GUI feature to determine the optimal setting. In this case the IDRIVE value should be set to 15 (decimal), which results in an oscillation amplitude of 1.68 V(pk). The INIT_DRIVE current field should be set to 0x00. The combined value for the DRIVE_CURRENT_CH0 register (addr 0x1E) is 0x7C00. Program the settling time for Channel 0 (see Multi-Channel and Single-Channel Operation). (a) CHx_SETTLECOUNT > Vpk × fREFx × C × π2 / (32 × IDRIVEX) → 7.5, rounded up to 8. To provide margin to account for system tolerances, a higher value of 10 is chosen. (b) Register 0x10 should be programmed to a minimum of 10. (c) The settle time is: (10 x 16)/40,000,000 = 4 µs (d) The value for Chan. 0 SETTLECOUNT register (0x10) is 0x000A. The channel switching delay is ~1μs for fREF = 40 MHz (see Multi-Channel and Single-Channel Operation) Set the conversion time by the programming the reference count for Channel 0. The budget for the conversion time is : 1/N * (TSAMPLE – settling time – channel switching delay) = 1/3 (10,000 – 4 – 1) = 3.33 ms (a) To determine the conversion time register value, use the following equation and solve for CH0_RCOUNT: Conversion Time (tC0)= (CH0_RCOUNTˣ16)/fREF0. (b) This results in CH0_RCOUNT having a value of 8329 decimal (rounded down). Note that this yields an ENOB > 13 bits. Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Typical Application (continued) (c) Set the CH0_RCOUNT register (0x08) to 0x2089. 6. Use the default values for the ERROR_CONFIG register (address 0x19). By default, no interrupts are enabled 7. Program the MUX_CONFIG register (a) Set the AUTOSCAN_EN to b1 bit to enable sequential mode (b) Set RR_SEQUENCE to b10 to enable data conversion on three channels (channel 0, channel 1, channel 2) (c) Set DEGLITCH to b101 to set the input deglitch filter bandwidth to 10MHz, the lowest setting that exceeds the oscillation tank frequency. (d) The combined value for the MUX_CONFIG register (address 0x1B) is 0xC20D 8. Finally, program the CONFIG register as follows: (a) Set the ACTIVE_CHAN field to b00 to select channel 0. (b) Set SLEEP_MODE_EN field to b0 to enable conversion. (c) Set SENSOR_ACTIVATE_SEL = b0, for full current drive during sensor activation (d) Set the REF_CLK_SRC field to b1 to use the external clock source. (e) Set the other fields to their default values. (f) The combined value for the CONFIG register (address 0x1A) is 0x1601. We then read the conversion results for channel 0 to channel 2 every 10ms from register addresses 0x00 to 0x05. Based on the example configuration above, the following register write sequence is recommended: Table 47. Recommended Initial Register Configuration Values (Multi-channel Operation) ADDRESS VALUE REGISTER NAME COMMENTS 0x08 0x8329 RCOUNT_CH0 Reference count calculated from timing requirements (100 SPS) and resolution requirements 0x09 0x8329 RCOUNT_CH1 Reference count calculated from timing requirements (100 SPS) and resolution requirements 0x0A 0x8329 RCOUNT_CH2 Reference count calculated from timing requirements (100 SPS) and resolution requirements 0x10 0x000A SETTLECOUNT_CH0 Minimum settling time for chosen sensor 0x11 0x000A SETTLECOUNT_CH1 Minimum settling time for chosen sensor 0x12 0x000A SETTLECOUNT_CH2 Minimum settling time for chosen sensor 0x14 0x2002 CLOCK_DIVIDER_CH0 CH0_FIN_DIVIDER = 1, CH0_FREF_DIVIDER = 2 0x15 0x2002 CLOCK_DIVIDER_CH1 CH1_FIN_DIVIDER = 1, CH1_FREF_DIVIDER = 2 0x16 0x2002 CLOCK_DIVIDER_CH2 CH1_FIN_DIVIDER = 1, CH1_FREF_DIVIDER = 2 0x19 0x0000 ERROR_CONFIG Can be changed from default to report status and error conditions 0x1B 0xC20D MUX_CONFIG Enable Ch 0 , Ch 1, and Ch 2 (sequential mode), set Input deglitch bandwidth to 10MHz 0x1E 0x7C00 DRIVE_CURRENT_CH0 Sets sensor drive current on ch 0 0x1F 0x7C00 DRIVE_CURRENT_CH1 Sets sensor drive current on ch 1 0x20 0x7C00 DRIVE_CURRENT_CH2 Sets sensor drive current on ch 2 0x1A 0x1601 CONFIG enable full current drive during sensor activation, select external clock source, wake up device to start conversion. This register write must occur last because device configuration is not permitted while the FDC is in active mode. 10.2.3.3 Inductor Self-Resonant Frequency Every inductor has a distributed parasitic capacitance, which is dependent on construction and geometry. At the Self-Resonant Frequency (SRF), the reactance of the inductor cancels the reactance of the parasitic capacitance. Above the SRF, the inductor will electrically appear to be a capacitor. Because the parasitic capacitance is not well-controlled or stable, it is recommended that: fSENSOR < 0.8 × fSR. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 43 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com 175.0 150.0 Ls (µH) 125.0 100.0 75.0 50.0 25.0 0.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 Frequency (MHz) Figure 58. Example Coil Inductance vs. Frequency The example inductor in Figure 58, has a SRF at 6.38 MHz; therefore the inductor should not be operated above 0.8×6.38 MHz, or 5.1 MHz. 44 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 10.2.4 Application Curves Common test conditions (unless specified otherwise): Sensor capacitor: 1 layer, 20.9 x 13.9 mm, Bourns CMH322522-180KL sensor inductor with L=18 µH and 33 pF 1% COG/NP0 Target: Grounded aluminum plate (176 x 123 mm), Channel = Channel 0 (continuous mode) CLKIN = 40 MHz, CHx_FIN_SEL = b10, CHx_FREF_DIVIDER = b00 0000 0001 CH0_RCOUNT = 0xFFFF, SETTLECOUNT_CH0 = 0x0100, DRIVE_CURRENT_CH0 = 0x7800 0.14 25 0.12 Capacitance (pF) Capacitance (pF) 20 15 10 0.1 0.08 0.06 0.04 5 0.02 0 20 0 0 2 4 6 8 10 12 14 16 18 Target Distance (mm) with 20.9 x 13.9 mm Sensor 20 D028 Figure 59. FDC2212 / FDC2214: Capacitance vs. Target Distance (0 to 20mm) D029 10 4.08 ksps 610 sps 38 sps 9 Measurement Precision (mm) 0.03 Capacitance (pF) 40 Figure 60. FDC2112 / FDC2114: Capacitance vs. Target Distance (20 to 40mm) 0.035 0.025 0.02 0.015 0.01 0.005 0 40 22 24 26 28 30 32 34 36 38 Target Distance (mm) with 20.9 x 13.9 mm Sensor 8 7 6 5 4 3 2 1 0 42 44 46 48 50 52 54 56 58 Target Distance (mm) with 20.9 x 13.9 mm Sensor 60 D030 Figure 61. FDC2212 / FDC2214: Capacitance vs. Target Distance (40 to 60mm) 0 20 40 60 80 Target Distance (mm) with 20.9 x 13.9 mm Sensor 100 D032 Figure 62. Measurement precision in Distance vs. Target Distance (0 to 60mm) 10.2.5 Power-Cycled Applications For applications which do not require high sample rates or maximum conversion resolution, the total active conversion time of the FDC can be minimized to reduce power consumption. This can be done by either by using sleep mode or shutdown mode during times in which conversions are not required (see Device Functional Modes). As an example, for an application which only needs 10 samples per second with a resolution of 16 bits can utilize the low-power modes. The sensor requires SETTLECOUNT = 16 and IDRIVE of 01111b (0.146 mA). Given FREF = 40 MHz and RCOUNT = 4096 will provide the resolution required. This corresponds to 4096 * 16 * 10 / 40 MHz → 16.4 ms of active conversion time per second. Start-up time and channel switch delay account for an additional 0.34 ms. For the remainder of the time, the device can be in sleep mode: Therefore, the average current is 19.4 ms * 3.6 mA active current + 980.6 ms of 35 µA of sleep current, which is approximately 104.6 µA of average supply current. Sleep mode retains register settings and therefore requires less I2C writes to wake up the FDC than shutdown mode. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 45 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Greater current savings can be realized by use of shutdown mode during inactive periods. In shutdown mode, device configuration is not retained, and so the device must be configured for each sample. For this example, configuring each sample takes approximately 1.2 ms (13 registers * 92.5 µs per register). The total active time is 20.6 ms. The average current is 20 ms * 3.6 mA active current + 980 ms * 2 µA of shutdown current, which is approximately 75 µA of average supply current. 10.3 Do's and Don'ts • • Do leave a small gap between sensor plates in differential configurations. 2-3mm minimum separation is recommended. The FDC does not support hot-swapping of the sensors. Do not hot-swap sensors, for example by using external multiplexers. 11 Power Supply Recommendations The FDC requires a voltage supply within 2.7 V and 3.6 V. Multilayer ceramic bypass X7R capacitors of 0.1 μF and 1 μF between the VDD and GND pins are recommended. If the supply is located more than a few inches from the FDC, additional bulk capacitance may be required in addition to the ceramic bypass capacitors. An electrolytic capacitor with a value of 10 μF is a typical choice. The optimum placement is closest to the VDD and GND pins of the device. Care should be taken to minimize the loop area formed by the bypass capacitor connection, the VDD pin, and the GND pin of the device. See Figure 63 and Figure 63 for a layout example. 12 Layout 12.1 Layout Guidelines • • Avoid long traces to connect the sensor to the FDC. Short traces reduce parasitic capacitances between sensor inductor and offer higher system performance. Systems that require matched channel response need to have matched trace length on all active channels. 12.2 Layout Example Figure 63 to Figure 66 show the FDC2114 / FDC2214 evaluation module (EVM) layout. 46 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Layout Example (continued) Figure 63. Example PCB Layout: Top Layer (Signal) Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 47 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Layout Example (continued) Figure 64. Example PCB Layout: Mid-layer 1 (GND) 48 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 Layout Example (continued) Figure 65. Example PCB Layout: Mid-layer 2 (Power) Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 49 FDC2212, FDC2214, FDC2112, FDC2114 SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 www.ti.com Layout Example (continued) Figure 66. Example PCB Layout: Bottom Layer (Signal) 50 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 FDC2212, FDC2214, FDC2112, FDC2114 www.ti.com SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015 13 Device and Documentation Support 13.1 Device Support 13.1.1 Third-Party Products Disclaimer TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE. 13.2 Related Links Table 48 lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 48. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY FDC2212 Click here Click here Click here Click here Click here FDC2214 Click here Click here Click here Click here Click here FDC2112 Click here Click here Click here Click here Click here FDC2114 Click here Click here Click here Click here Click here 13.3 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 13.4 Trademarks E2E is a trademark of Texas Instruments. All other trademarks are the property of their respective owners. 13.5 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 13.6 Glossary SLYZ022 — TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 14 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Copyright © 2015, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114 51 PACKAGE OPTION ADDENDUM www.ti.com 26-Jun-2016 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) FDC2112DNTR ACTIVE WSON DNT 12 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2112 FDC2112DNTT ACTIVE WSON DNT 12 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2112 FDC2112QDNTRQ1 ACTIVE WSON DNT 12 4500 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FDC2112 Q1 FDC2112QDNTTQ1 ACTIVE WSON DNT 12 250 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FDC2112 Q1 FDC2114QRGHRQ1 ACTIVE WQFN RGH 16 4500 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FC2114Q FDC2114QRGHTQ1 ACTIVE WQFN RGH 16 250 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FC2114Q FDC2114RGHR ACTIVE WQFN RGH 16 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2114 FDC2114RGHT ACTIVE WQFN RGH 16 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2114 FDC2212DNTR ACTIVE WSON DNT 12 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2212 FDC2212DNTT ACTIVE WSON DNT 12 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2212 FDC2212QDNTRQ1 ACTIVE WSON DNT 12 4500 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FDC2212 Q1 FDC2212QDNTTQ1 ACTIVE WSON DNT 12 250 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FDC2212 Q1 FDC2214QRGHRQ1 ACTIVE WQFN RGH 16 4500 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FC2214Q FDC2214QRGHTQ1 ACTIVE WQFN RGH 16 250 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 FC2214Q FDC2214RGHR ACTIVE WQFN RGH 16 4500 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2214 FDC2214RGHT ACTIVE WQFN RGH 16 250 Green (RoHS & no Sb/Br) CU SN Level-1-260C-UNLIM -40 to 125 FDC2214 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 26-Jun-2016 LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS), Pb-Free (RoHS Exempt), or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Pb-Free (RoHS Exempt): This component has a RoHS exemption for either 1) lead-based flip-chip solder bumps used between the die and package, or 2) lead-based die adhesive used between the die and leadframe. The component is otherwise considered Pb-Free (RoHS compatible) as defined above. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. OTHER QUALIFIED VERSIONS OF FDC2112, FDC2112-Q1, FDC2114, FDC2114-Q1, FDC2212, FDC2212-Q1, FDC2214, FDC2214-Q1 : • Catalog: FDC2112, FDC2114, FDC2212, FDC2214 • Automotive: FDC2112-Q1, FDC2114-Q1, FDC2212-Q1, FDC2214-Q1 NOTE: Qualified Version Definitions: Addendum-Page 2 PACKAGE OPTION ADDENDUM www.ti.com 26-Jun-2016 • Catalog - TI's standard catalog product • Automotive - Q100 devices qualified for high-reliability automotive applications targeting zero defects Addendum-Page 3 PACKAGE MATERIALS INFORMATION www.ti.com 25-Jun-2016 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing FDC2112DNTR WSON DNT 12 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2112DNTT WSON DNT 12 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2112QDNTRQ1 WSON DNT 12 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2112QDNTTQ1 WSON DNT 12 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2114QRGHRQ1 WQFN RGH 16 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2114QRGHTQ1 WQFN RGH 16 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2114RGHR WQFN RGH 16 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2114RGHT WQFN RGH 16 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2212DNTR WSON DNT 12 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2212DNTT WSON DNT 12 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2212QDNTRQ1 WSON DNT 12 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2212QDNTTQ1 WSON DNT 12 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2214QRGHRQ1 WQFN RGH 16 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2214QRGHTQ1 WQFN RGH 16 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2214RGHR WQFN RGH 16 4500 330.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 FDC2214RGHT WQFN RGH 16 250 178.0 12.4 4.3 4.3 1.3 8.0 12.0 Q1 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 25-Jun-2016 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) FDC2112DNTR WSON DNT 12 4500 367.0 367.0 35.0 FDC2112DNTT WSON DNT 12 250 210.0 185.0 35.0 FDC2112QDNTRQ1 WSON DNT 12 4500 367.0 367.0 35.0 FDC2112QDNTTQ1 WSON DNT 12 250 213.0 191.0 55.0 FDC2114QRGHRQ1 WQFN RGH 16 4500 367.0 367.0 35.0 FDC2114QRGHTQ1 WQFN RGH 16 250 213.0 191.0 55.0 FDC2114RGHR WQFN RGH 16 4500 367.0 367.0 35.0 FDC2114RGHT WQFN RGH 16 250 210.0 185.0 35.0 FDC2212DNTR WSON DNT 12 4500 367.0 367.0 35.0 FDC2212DNTT WSON DNT 12 250 210.0 185.0 35.0 FDC2212QDNTRQ1 WSON DNT 12 4500 367.0 367.0 35.0 FDC2212QDNTTQ1 WSON DNT 12 250 213.0 191.0 55.0 FDC2214QRGHRQ1 WQFN RGH 16 4500 367.0 367.0 35.0 FDC2214QRGHTQ1 WQFN RGH 16 250 213.0 191.0 55.0 FDC2214RGHR WQFN RGH 16 4500 367.0 367.0 35.0 FDC2214RGHT WQFN RGH 16 250 210.0 185.0 35.0 Pack Materials-Page 2 MECHANICAL DATA DNT0012B WSON - 0.8mm max height SON (PLASTIC SMALL OUTLINE - NO LEAD) SDA12B (Rev A) 4214928/A 03/2013 NOTES: 1. All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. This package is designed to be soldered to a thermal pad on the board for thermal and mechanical performance. For more information, refer to QFN/SON PCB application note in literature No. SLUA271 (www.ti.com/lit/slua271). www.ti.com PACKAGE OUTLINE RGH0016A WQFN - 0.8 mm max height SCALE 3.500 WQFN 4.1 3.9 B A PIN 1 INDEX AREA 0.5 0.3 0.3 0.2 4.1 3.9 DETAIL OPTIONAL TERMINAL TYPICAL C 0.8 MAX SEATING PLANE (0.1) TYP 2.6 0.1 5 8 SEE TERMINAL DETAIL 12X 0.5 4 9 4X 1.5 1 12 16X PIN 1 ID (OPTIONAL) 13 16 16X 0.3 0.2 0.1 0.05 C A C B 0.5 0.3 4214978/A 10/2013 NOTES: 1. All linear dimensions are in millimeters. Dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. 2. This drawing is subject to change without notice. 3. The package thermal pad must be soldered to the printed circuit board for thermal and mechanical performance. www.ti.com EXAMPLE BOARD LAYOUT RGH0016A WQFN - 0.8 mm max height WQFN ( 2.6) SYMM 16 13 SEE DETAILS 16X (0.6) 16X (0.25) 1 12 (0.25) TYP SYMM (3.8) (1) 9 4 12X (0.5) 5X ( 0.2) VIA 8 5 (1) (3.8) LAND PATTERN EXAMPLE SCALE:15X 0.07 MIN ALL AROUND 0.07 MAX ALL AROUND METAL SOLDER MASK OPENING METAL SOLDER MASK OPENING NON SOLDER MASK DEFINED (PREFERRED) SOLDER MASK DEFINED SOLDER MASK DETAILS 4214978/A 10/2013 NOTES: (continued) 4. This package is designed to be soldered to a thermal pad on the board. For more information, see QFN/SON PCB application report in literature No. SLUA271 (www.ti.com/lit/slua271). www.ti.com EXAMPLE STENCIL DESIGN RGH0016A WQFN - 0.8 mm max height WQFN SYMM (0.675) METAL TYP 13 16 16X (0.6) 16X (0.25) 12 1 (0.25) TYP (0.675) SYMM (3.8) 12X (0.5) 9 4 8 5 4X (1.15) (3.8) SOLDER PASTE EXAMPLE BASED ON 0.125 mm THICK STENCIL EXPOSED PAD 78% PRINTED SOLDER COVERAGE BY AREA SCALE:15X 4214978/A 10/2013 NOTES: (continued) 5. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations. www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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