±0.25°C Accurate, 16-Bit Digital SPI Temperature Sensor ADT7320 Data Sheet FEATURES GENERAL DESCRIPTION High performance Temperature accuracy ±0.20°C from −10°C to +85°C at 3.0 V ±0.25°C from −20°C to +105°C at 2.7 V to 3.3 V 16-bit temperature resolution: 0.0078°C Ultralow temperature drift: 0.0073°C NIST traceable or equivalent Fast first temperature conversion on power-up of 6 ms Easy implementation No temperature calibration/correction required by user No linearity correction required Low power Power saving 1 sample per second (SPS) mode 700 µW typical at 3.3 V in normal mode 7 µW typical at 3.3 V in shutdown mode Wide operating ranges Temperature range: −40°C to +150°C Voltage range: 2.7 V to 5.5 V Programmable interrupts Critical overtemperature interrupt Overtemperature/undertemperature interrupt SPI-compatible interface 16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package The ADT7320 is a high accuracy digital temperature sensor that offers breakthrough performance over a wide industrial temperature range, housed in a 4 mm × 4 mm LFCSP package. It contains an internal band gap reference, a temperature sensor, and a 16-bit analog-to-digital converter (ADC) to monitor and digitize the temperature to a resolution of 0.0078°C. The ADC resolution, by default, is set to 13 bits (0.0625°C). The ADC resolution is a user programmable mode that can be changed through the serial interface. APPLICATIONS 1. 2. 3. 4. The ADT7320 is guaranteed to operate over supply voltages from 2.7 V to 5.5 V. Operating at 3.3 V, the average supply current is typically 210 µA. The ADT7320 has a shutdown mode that powers down the device and offers a shutdown current of typically 2.0 µA at 3.3 V. The ADT7320 is rated for operation over the −40°C to +150°C temperature range. The CT pin is an open-drain output that becomes active when the temperature exceeds a programmable critical temperature limit. The INT pin is also an open-drain output that becomes active when the temperature exceeds a programmable limit. The INT pin and CT pin can operate in either comparator or interrupt mode. PRODUCT HIGHLIGHTS RTD and thermistor replacement Thermocouple cold junction compensation Medical equipment Industrial control and test Food transportation and storage Environmental monitoring and HVAC Laser diode temperature control 5. Ease of use, no calibration or correction required by the user. Low power consumption. Excellent long term stability and reliability. High accuracy for industrial, instrumentation, and medical applications. Packaged in a 16-lead, RoHS-compliant, 4 mm × 4 mm LFCSP package. FUNCTIONAL BLOCK DIAGRAM TEMPERATURE VALUE REGISTER ADT7320 TLOW REGISTER TCRIT REGISTER STATUS REGISTER THIGH REGISTER ID REGISTER INTERNAL REFERENCE 10 CT TCRIT TEMPERATURE SENSOR DIN 3 9 INT THIGH SCLK 1 DOUT 2 Σ-Δ MODULATOR FILTER LOGIC SPI INTERFACE TLOW 11 GND 12 VDD CS 4 09012-001 THYST REGISTER CONFIGURATION REGISTER INTERNAL OSCILLATOR Figure 1. 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Technical Support www.analog.com ADT7320 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Configuration Register .............................................................. 14 Applications ....................................................................................... 1 Temperature Value Register ...................................................... 15 General Description ......................................................................... 1 ID Register................................................................................... 15 Product Highlights ........................................................................... 1 TCRIT Setpoint Register ............................................................... 15 Functional Block Diagram .............................................................. 1 THYST Setpoint Register............................................................... 16 Revision History ............................................................................... 2 THIGH Setpoint Register .............................................................. 16 Specifications..................................................................................... 3 TLOW Setpoint Register ............................................................... 16 SPI Timing Specifications ........................................................... 4 Serial Interface ................................................................................ 17 Absolute Maximum Ratings ............................................................ 5 SPI Command Byte .................................................................... 17 ESD Caution .................................................................................. 5 Writing Data ............................................................................... 18 Pin Configuration and Function Descriptions ............................. 6 Reading Data ............................................................................... 19 Typical Performance Characteristics ............................................. 7 Interfacing to DSPs or Microcontrollers ................................. 19 Theory of Operation ........................................................................ 9 Serial Interface Reset.................................................................. 19 Circuit Information ...................................................................... 9 INT and CT Outputs...................................................................... 20 Converter Details.......................................................................... 9 Undertemperature and Overtemperature Detection ............ 20 Continuous Conversion Mode ................................................... 9 Applications Information .............................................................. 22 One-Shot Mode .......................................................................... 10 Thermal Response Time ........................................................... 22 1 SPS Mode .................................................................................. 11 Supply Decoupling ..................................................................... 22 Shutdown Mode.......................................................................... 11 Powering from a Switching Regulator ..................................... 22 Fault Queue ................................................................................. 11 Temperature Measurement ....................................................... 22 Temperature Data Format ......................................................... 12 Quick Guide to Measuring Temperature ................................ 22 Temperature Conversion Formulas ......................................... 12 Outline Dimensions ....................................................................... 23 Registers ........................................................................................... 13 Ordering Guide .......................................................................... 23 Status Register ............................................................................. 13 REVISION HISTORY 12/12—Revision 0: Initial Version Rev. 0 | Page 2 of 24 Data Sheet ADT7320 SPECIFICATIONS TA = −40°C to +125°C, VDD = 2.7 V to 5.5 V, unless otherwise noted. Table 1. Parameter TEMPERATURE SENSOR AND ADC Accuracy 1 Min ADC Resolution Temperature Resolution 13-Bit 16-Bit Temperature Conversion Time Fast Temperature Conversion Time 1 SPS Conversion Time Temperature Hysteresis 4 Repeatability 5 Drift 6 DC PSRR DIGITAL OUTPUTS (CT, INT), OPEN DRAIN High Output Leakage Current, IOH Output Low Voltage, VOL Output High Voltage, VOH Output Capacitance, COUT DIGITAL INPUTS (DIN, SCLK, CS) Input Current Input Low Voltage, VIL Input High Voltage, VIH Pin Capacitance DIGITAL OUTPUT (DOUT) Output High Voltage, VOH Output Low Voltage, VOL Output Capacitance, COUT POWER REQUIREMENTS Supply Voltage Supply Current At 3.3 V At 5.5 V 1 SPS Current At 3.3 V At 5.5 V Typ Max Unit Test Conditions/Comments 0.0017 ±0.20 2 ±0.25 ±0.31 ±0.35 ±0.50 ±0.50 3 ±0.66 −0.85 −1.0 13 °C °C °C °C °C °C °C °C °C Bits 16 Bits TA = −10°C to +85°C, VDD = 3.0 V TA = −20°C to +105°C, VDD = 2.7 V to 3.3 V TA = −40°C to +105°C, VDD = 3.0 V TA = −40°C to +105°C, VDD = 2.7 V to 3.3 V TA = −40°C to +125°C, VDD = 2.7 V to 3.3 V TA = −10°C to +105°C, VDD = 4.5 V to 5.5 V TA = −40°C to +125°C, VDD = 4.5 V to 5.5 V TA = +150°C, VDD = 4.5 V to 5.5 V TA = +150°C, VDD = 2.7 V to 3.3 V Twos complement temperature value of sign bit plus 12 ADC bits (power-up default resolution) Twos complement temperature value of sign bit plus 15 ADC bits (Bit 7 = 1 in the configuration register) 0.0625 0.0078 240 6 60 ±0.002 ±0.015 0.0073 0.1 °C °C ms ms ms °C °C °C °C/V 13-bit resolution (sign + 12 bits) 16-bit resolution (sign + 15 bits) Continuous conversion and one-shot conversion mode First conversion on power-up only Conversion time for 1 SPS mode Temperature cycle = 25°C to 125°C and back to 25°C TA = 25°C 500 hour stress test at 150°C with VDD = 5.0 V TA = 25°C 5 0.4 µA V V pF CT and INT pins pulled up to 5.5 V IOL = 3 mA at 5.5 V, IOL = 1 mA at 3.3 V ±1 0.4 VIN = 0 V to VDD 10 µA V V pF 0.4 50 V V pF ISOURCE = ISINK = 200 µA IOL = 200 µA 5.5 V 265 300 µA µA 0.1 0.7 × VDD 2 0.7 × VDD 5 VDD − 0.3 2.7 Peak current while converting, SPI interface inactive 210 250 46 65 µA µA Rev. 0 | Page 3 of 24 1 SPS mode, TA = 25°C VDD = 3.3 V VDD = 5.5 V ADT7320 Data Sheet Parameter Shutdown Current At 3.3 V At 5.5 V Power Dissipation, Normal Mode Power Dissipation, 1 SPS Mode Min Typ Max Unit 2.0 5.2 700 150 15 25 µA µA µW µW Test Conditions/Comments Supply current in shutdown mode VDD = 3.3 V, normal mode at 25°C Power dissipated for VDD = 3.3 V, TA = 25°C Accuracy specification includes repeatability. The equivalent 3 σ limits are ±0.15°C. This 3 σ specification is provided to enable comparison with other vendors who use these limits. For higher accuracy at 5 V operation, contact Analog Devices, Inc. 4 Temperature hysteresis does not include repeatability. 5 Based on a floating average of 10 readings. 6 Drift includes solder heat resistance and lifetime test performed as per JEDEC Standard JESD22-A108. 1 2 3 SPI TIMING SPECIFICATIONS TA = −40°C to +150°C, VDD = 2.7 V to 5.5 V, unless otherwise noted. All input signals are specified with rise time (tR) = fall time (tF) = 5 ns (10% to 90% of VDD) and timed from a voltage level of 1.6 V. Table 2. Parameter 1, 2 Limit at TMIN, TMAX Unit Descriptions t1 t2 t3 t4 t5 t6 0 100 100 30 25 5 60 80 10 80 0 0 60 80 10 ns min ns min ns min ns min ns min ns min ns max ns max ns min ns max ns min ns min ns max ns max ns min CS falling edge to SCLK active edge setup time SCLK high pulse width SCLK low pulse width Data setup time prior to SCLK rising edge Data hold time after SCLK rising edge Data access time after SCLK falling edge VDD = 4.5 V to 5.5 V VDD = 2.7 V to 3.6 V Bus relinquish time after CS inactive edge Bus relinquish time after CS inactive edge SCLK inactive edge to CS rising edge hold time CS falling edge to DOUT active time VDD = 4.5 V to 5.5 V VDD = 2.7 V to 3.6 V SCLK inactive edge to DOUT low t7 3 t8 t9 t10 Sample tested during initial release to ensure compliance. See Figure 2. 3 This means that the times quoted in the timing characteristics in Table 2 are the true bus relinquish times of the part and, as such, are independent of external bus loading capacitances. 1 2 CS t1 t2 1 SCLK t8 t3 2 3 6 7 8 9 10 23 24 t4 t5 DIN LSB t6 t9 DOUT MSB t10 LSB t7 Figure 2. Detailed SPI Timing Diagram Rev. 0 | Page 4 of 24 09012-002 MSB Data Sheet ADT7320 ABSOLUTE MAXIMUM RATINGS Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 3. Parameter VDD to GND DIN Input Voltage to GND DOUT Voltage to GND SCLK Input Voltage to GND CS Input Voltage to GND CT and INT Output Voltage to GND ESD Rating (Human Body Model) Operating Temperature Range 1 Storage Temperature Range Maximum Junction Temperature, TJMAX Power Dissipation 2 16-Lead LFCSP 3 Thermal Impedance 4 θJA, Junction-to-Ambient (Still Air) θJC, Junction-to-Case IR Reflow Soldering Peak Temperature (RoHS-Compliant Package) Time at Peak Temperature Ramp-Up Rate Ramp-Down Rate Time from 25°C to Peak Temperature Rating −0.3 V to +7 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.3 V −0.3 V to VDD + 0.3 V 2.0 kV −40°C to +150°C −65°C to +160°C 150°C ESD CAUTION WMAX = (TJMAX − TA)/θJA 37°C/W 33°C/W 220°C 260°C (0°C/−5°C) 20 sec to 40 sec 3°C/sec maximum −6°C/sec maximum 8 minutes maximum 1 Sustained operation above 125°C results in a shorter product lifetime. For more information, contact an Analog Devices, Inc., sales representative. 2 Values relate to package being used on a standard 2-layer PCB. This gives a worst-case θJA and θJC. 3 TA = ambient temperature. 4 Junction-to-case resistance is applicable to components featuring a preferential flow direction, for example, components mounted on a heat sink. Junction-to-ambient resistance is more useful for air cooled, PCBmounted components. Rev. 0 | Page 5 of 24 ADT7320 Data Sheet 13 NC 14 NC 15 NC 16 NC PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 17 EPAD SCLK 1 12 VDD ADT7320 DOUT 2 10 CT 9 INT NC 8 NC 7 NC 6 NC 5 CS 4 NOTES 1. NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. THE NC PIN IS NOT BONDED TO THE DIE INTERNALLY. 2. TO ENSURE CORRECT OPERATION, THE EXPOSED PAD SHOULD EITHER BE LEFT FLOATING OR CONNECTED TO GROUND. 09012-003 DIN 3 11 GND TOP VIEW (Not to Scale) Figure 3. Pin Configuration Table 4. Pin Function Descriptions Pin No. 1 2 3 Mnemonic SCLK DOUT DIN 4 5 6 7 8 9 CS NC NC NC NC INT 10 CT 11 12 13 14 15 16 17 GND VDD NC NC NC NC EPAD Description Serial Clock Input. The serial clock is used to clock data into and out of any register of the ADT7320. Serial Data Output. Data is clocked out on the SCLK falling edge and is valid on the SCLK rising edge. Serial Data Input. Serial data to be loaded to the control registers of the part is provided on this input. Data is clocked into the registers on the rising edge of SCLK. Chip Select Input. The device is enabled when this input is low. The device is disabled when this pin is high. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. Overtemperature and Undertemperature Interrupt. Logic output. Power-up default setting is as an active low comparator interrupt. Open-drain configuration. A pull-up resistor is required, typically 10 kΩ. Critical Overtemperature Interrupt. Logic output. Power-up default polarity is active low. Open-drain configuration. A pull-up resistor is required, typically 10 kΩ. Analog and Digital Ground. Positive Supply Voltage (2.7 V to 5.5 V). Decouple the supply with a 0.1 μF ceramic capacitor to GND. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. No Connect. Do not connect to this pin. The NC pin is not bonded to the die internally. Exposed Pad. To ensure correct operation, the exposed pad should either be left floating or connected to ground. Rev. 0 | Page 6 of 24 Data Sheet ADT7320 TYPICAL PERFORMANCE CHARACTERISTICS 30 1.00 25 0.50 SHUTDOWN IDD (µA) MAX ACCURACY LIMITS 0.25 0 –0.25 MAX ACCURACY LIMITS 20 15 10 5.0V 4.5V 3.3V 3.0V 2.7V 3.6V –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 140 0 –100 09012-027 –1.00 –60 –50 0 50 100 150 200 TEMPERATURE (°C) 09012-032 5 –0.75 Figure 7. Shutdown Current vs. Temperature Figure 4. Temperature Accuracy at 3 V 300 1.00 0.75 0.50 CONTINUOUS CONVERSION 250 MAX ACCURACY LIMITS 200 0.25 IDD (µA) 0 –0.25 150 100 –0.50 1SPS MAX ACCURACY LIMITS 50 –0.75 –40 –20 0 20 40 60 80 TEMPERATURE (°C) 100 120 140 0 2.5 09012-026 –1.00 –60 3.5 4.0 4.5 5.0 5.5 6.0 SUPPLY VOLTAGE (V) Figure 5. Temperature Accuracy at 5 V Figure 8. Average Operating Supply Current vs. Supply Voltage 8 300 5.5V CONTINUOUS CONVERSION 250 7 6 SHUTDOWN IDD (µA) 3.0V CONTINUOUS CONVERSION 200 150 100 0 –100 –50 0 5 4 3 5.5V 1SPS 2 3.0V 1SPS 1 50 50 100 150 TEMPERATURE (°C) 200 09012-028 IDD (µA) 3.0 09012-029 TEMPERATURE ERROR (°C) 5.5V –0.50 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) Figure 9. Shutdown Current vs. Supply Voltage Figure 6. Operating Supply Current vs. Temperature Rev. 0 | Page 7 of 24 6.0 09012-210 TEMPERATURE ERROR (°C) 0.75 ADT7320 Data Sheet 140 125°C 120 85°C 80 IT TAKES LESS THAN 2 SECONDS FOR THE DUT TO REACH 63.2% OF ITS FINAL TEMPERATURE SPAN 60 40 20 0 0 5 10 15 TIME (s) 20 25 09012-110 DUT TEMPERATURE (°C) 105°C 100 Figure 10. Thermal Response Time Rev. 0 | Page 8 of 24 Data Sheet ADT7320 THEORY OF OPERATION CIRCUIT INFORMATION The ADT7320 is a high accuracy digital temperature sensor that uses a 16-bit ADC to monitor and digitize the temperature to a resolution of 0.0078°C. By default, the ADC resolution is set to 13 bits (0.0625°C). An internal temperature sensor generates a voltage proportional to absolute temperature; this voltage is compared to an internal voltage reference and input into a precision digital modulator. The internal temperature sensor has high accuracy and linearity over the entire rated temperature range without the need for correction or calibration by the user. The sensor output is digitized by a sigma-delta (Σ-Δ) modulator, also known as the charge balance type ADC. This type of converter uses time domain oversampling and a high accuracy comparator to deliver 16 bits of resolution in an extremely compact circuit. CONVERTER DETAILS The Σ-Δ modulator consists of an input sampler, a summing network, an integrator, a comparator, and a 1-bit digital-to-analog converter (DAC). This architecture creates a negative feedback loop and minimizes the integrator output by changing the duty cycle of the comparator output in response to the input voltage changes. The comparator samples the output of the integrator at a much higher rate than the input sampling frequency. This oversampling spreads the quantization noise over a much wider band than that of the input signal, improving overall noise performance and increasing accuracy. The ADT7320 can be configured to operate in any one of the following four operating modes: normal mode, one-shot mode, 1 SPS mode, and shutdown mode. CONTINUOUS CONVERSION MODE In continuous conversion mode (default power-up mode), the ADT7320 runs an automatic conversion sequence. During this automatic conversion sequence, a conversion takes 240 ms to complete and the ADT7320 is continuously converting. This means that as soon as one temperature conversion is completed, another temperature conversion begins. Each temperature conversion result is stored in the temperature value register and is available through the SPI interface. In continuous conversion mode, the read operation provides the most recent converted result. On power-up, the first conversion is a fast conversion, taking typically 6 ms. If the temperature exceeds 147°C, the CT pin is asserted low. If the temperature exceeds 64°C, the INT pin is asserted low. Fast conversion temperature accuracy is typically within ±5°C. The conversion clock for the part is generated internally. No external clock is required except when reading from and writing to the serial port. The measured temperature value is compared with a critical temperature limit (stored in the 16-bit TCRIT setpoint register), a high temperature limit (stored in the 16-bit THIGH setpoint register), and a low temperature limit (stored in the 16-bit TLOW setpoint register). If the measured value exceeds the high or low temperature limits, the INT pin is activated; if it exceeds the TCRIT limit, the CT pin is activated. The polarity of the INT and CT pins is programmable for via the configuration register, and the INT and CT pins are also programmable for interrupt mode via the configuration register. The modulated output of the comparator is encoded using a circuit technique that results in SPI temperature data. Σ-∆ MODULATOR INTEGRATOR COMPARATOR VOLTAGE REFERENCE 1-BIT DAC CLOCK GENERATOR LPF DIGITAL FILTER TEMPERATURE VALUE REGISTER 13-/16-BIT 09012-012 1-BIT Figure 11. Σ-∆ Modulator Rev. 0 | Page 9 of 24 ADT7320 Data Sheet CS 0x08 DIN 0x20 WAIT 240ms MINIMUM FOR CONVERSION TO FINISH DATA 09012-300 DOUT SCLK Figure 12. Typical SPI One-Shot Write to Configuration Register Followed by a Read from the Temperature Value Register TEMPERATURE 149°C 148°C TCRIT 147°C 146°C 145°C 144°C 143°C TCRIT – THYST 142°C 141°C 140°C CT PIN POLARITY = ACTIVE LOW CT PIN POLARITY = ACTIVE HIGH TIME WRITE TO BIT 5 AND BIT 6 OF CONFIGURATION REGISTER.* WRITE TO BIT 5 AND BIT 6 OF CONFIGURATION REGISTER.* *THERE IS A 240ms DELAY BETWEEN WRITING TO THE CONFIGURATION REGISTER TO START A STANDARD ONE-SHOT CONVERSION AND THE CT PIN GOING ACTIVE. THIS IS DUE TO THE CONVERSION TIME. THE DELAY IS 60ms IN THE CASE OF A ONE-SHOT CONVERSION. 09012-013 WRITE TO BIT 5 AND BIT 6 OF CONFIGURATION REGISTER.* Figure 13. One-Shot CT Pin ONE-SHOT MODE CT and INT Operation in One-Shot Mode When one-shot mode is enabled, the ADT7320 immediately completes a conversion and then goes into shutdown mode. The one-shot mode is useful when one of the circuit design priorities is to reduce power consumption. See Figure 13 for more information on one-shot CT pin operation for TCRIT overtemperature events when one of the limits is exceeded. Note that in interrupt mode, a read from any register resets the INT and CT pins. To enable one-shot mode, set Bits [6:5] of the configuration register (Register Address 0x01) to 01. For the INT pin in comparator mode, if the temperature drops below the THIGH − THYST value or goes above the TLOW + THYST value, a write to the operation mode bits (Bit 5 and Bit 6 of the configuration register, Register Address 0x01) resets the INT pin. After writing to the operation mode bits, wait for at least 240 ms before reading back the temperature from the temperature value register. This delay ensures that the ADT7320 has adequate time to power up and complete a conversion. To obtain an updated temperature conversion, reset Bits[6:5] of the configuration register (Register Address 0x01) to 01. For the CT pin in comparator mode, if the temperature drops below the TCRIT − THYST value, a write to the operation mode bits (Bit 5 and Bit 6 of the configuration register, Register Address 0x01) resets the CT pin (see Figure 13). When using one-shot mode, ensure that the refresh rate is appropriate to the application being used. Rev. 0 | Page 10 of 24 Data Sheet ADT7320 1 SPS MODE FAULT QUEUE In 1 SPS mode, the part performs one measurement per second. A conversion takes 60 ms typically, and the part remains in the idle state for the remaining 940 ms period. This mode is enabled by setting Bits[6:5] of the configuration register (Register Address 0x01) to 10. Bit 0 and Bit 1 of the configuration register (Register Address 0x01) are used to set up a fault queue. Up to four faults are provided to prevent false tripping of the INT and CT pins when the ADT7320 is used in a noisy temperature environment. The number of faults set in the queue must occur consecutively to set the INT and CT outputs. For example, if the number of faults set in the queue is four, then four consecutive temperature conversions must occur, with each result exceeding a temperature limit set in any of the limit registers, before the INT and CT pins are activated. If two consecutive temperature conversions exceed a temperature limit and the third conversion does not, the fault count is reset to zero. SHUTDOWN MODE The ADT7320 can be placed in shutdown mode by setting Bits[6:5] of the configuration register (Register Address 0x01) to 11. The ADT7320 can be taken out of shutdown mode by setting Bits[6:5] of the configuration register (Register Address 0x01) to 00. The ADT7320 typically takes 1 ms (with a 0.1 μF decoupling capacitor) to come out of shut-down mode. The conversion result from the last conversion prior to shutdown can still be read from the ADT7320 even when it is in shutdown mode. When the part is taken out of shutdown mode, the internal clock restarts and a conversion is initiated. Rev. 0 | Page 11 of 24 ADT7320 Data Sheet TEMPERATURE DATA FORMAT TEMPERATURE CONVERSION FORMULAS One LSB of the ADC corresponds to 0.0625°C in 13-bit mode or 0.0078°C in 16-bit mode. The ADC can theoretically measure a temperature range of 255°C, but the ADT7320 is guaranteed to measure a low value temperature limit of −40°C to a high value temperature limit of +150°C. The temperature measurement result is stored in the 16-bit temperature value register and is compared with the high temperature limits stored in the TCRIT setpoint register and the THIGH setpoint register. It is also compared with the low temperature limit stored in the TLOW setpoint register. 16-Bit Temperature Data Format Temperature data in the temperature value register, the TCRIT setpoint register, the THIGH setpoint register, and the TLOW setpoint register are represented by a 13-bit, twos complement word. The MSB is the temperature sign bit. On power-up the three LSBs, Bit 0 to Bit 2, are not part of the temperature conversion result and are flag bits for TCRIT, THIGH, and TLOW. Table 5 shows the 13-bit temperature data format without Bit 0 to Bit 2. The number of bits in the temperature data-word can be extended to 16 bits, twos complement by setting Bit 7 to 1 in the configuration register (Register Address 0x01). When using a 16-bit temperature data value, Bit 0 to Bit 2 are not used as flag bits and are instead the LSB bits of the temperature value. The power-on default setting has a 13-bit temperature data value. Reading back the temperature from the temperature value register requires a 2-byte read. Designers that use a 9-bit temperature data format can still use the ADT7320 by ignoring the last four LSBs of the 13-bit temperature value. These four LSBs are Bit 3 to Bit 6 in Table 5. Positive Temperature = ADC Code (dec)/128 Negative Temperature = (ADC Code (dec) − 65,536)/128 where ADC Code uses all 16 bits of the data byte, including the sign bit. Negative Temperature = (ADC Code (dec) − 32,768)/128 where the MSB is removed from the ADC code. 13-Bit Temperature Data Format Positive Temperature = ADC Code (dec)/16 Negative Temperature = (ADC Code (dec) − 8192)/16 where ADC Code uses all 13 bits of the data byte, including the sign bit. Negative Temperature = (ADC Code (dec) − 4096)/16 where the MSB is removed from the ADC code. 10-Bit Temperature Data Format Positive Temperature = ADC Code (dec)/2 Negative Temperature = (ADC Code (dec) − 1024)/2 where ADC Code uses all 10 bits of the data byte, including the sign bit. Negative Temperature = (ADC Code (dec) − 512)/2 where the MSB is removed from the ADC Code. 9-Bit Temperature Data Format Table 5. 13-Bit Temperature Data Format Temperature −40°C −25°C −0.0625°C 0°C +0.0625°C +25°C +105°C +125°C +150°C Digital Output (Binary) Bits[15:3] 1 1101 1000 0000 1 1110 0111 0000 1 1111 1111 1111 0 0000 0000 0000 0 0000 0000 0001 0 0001 1001 0000 0 0110 1001 0000 0 0111 1101 0000 0 1001 0110 0000 Positive Temperature = ADC Code (dec) Negative Temperature = ADC Code (dec) − 512 where ADC Code uses all nine bits of the data byte, including the sign bit. Negative Temperature = ADC Code (dec) − 256 where the MSB is removed from the ADC Code. Rev. 0 | Page 12 of 24 Data Sheet ADT7320 REGISTERS STATUS REGISTER The ADT7320 contains eight registers: • • • • A status register A configuration register Five temperature registers An ID register The status register, temperature value register, and the ID register are read only. Table 6. ADT7320 Registers Register Address 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 Description Status Configuration Temperature value ID TCRIT setpoint THYST setpoint THIGH setpoint TLOW setpoint Power-On Default 0x80 0x00 0x0000 0xC3 0x4980 (147°C) 0x05 (5°C) 0x2000 (64°C) 0x0500 (10°C) This 8-bit read-only register (Register Address 0x00) reflects the status of the overtemperature and undertemperature interrupts that can cause the CT and INT pins to become active. It also reflects the status of a temperature conversion operation. The interrupt flags in this register are reset by a read operation to the status register and/or when the temperature value returns within the temperature limits including hysteresis. The RDY bit is reset after a read from the temperature value register. In oneshot and 1 SPS modes, the RDY bit is reset after a write to the operation mode bits in the configuration register. Table 7. Status Register (Register Address 0x00) Bit(s) [3:0] [4] Default Value 0000 0 Type R R Name Unused TLOW [5] 0 R THIGH [6] 0 R TCRIT [7] 1 R RDY Description Reads back 0. This bit is set to 1 when the temperature goes below the TLOW temperature limit. The bit is cleared to 0 when the status register is read and/or when the temperature measured rises above the limit set in the TLOW + THYST setpoint registers. This bit is set to 1 when the temperature rises above the THIGH temperature limit. This bit is cleared to 0 when the status register is read and/or when the temperature measured drops below the limit set in the THIGH − THYST setpoint registers. This bit is set to 1 when the temperature rises above the TCRIT temperature limit. This bit is cleared to 0 when the status register is read and/or when the temperature measured drops below the limit set in the TCRIT − THYST setpoint registers. This bit goes low when the temperature conversion result is written to the temperature value register. It is reset to 1 when the temperature value register is read. In one-shot and 1 SPS modes, this bit is reset after a write to the operation mode bits in the configuration register. Rev. 0 | Page 13 of 24 ADT7320 Data Sheet CONFIGURATION REGISTER This 8-bit read/write register (Register Address 0x01) stores various configuration modes for the ADT7320, including shutdown, overtemperature and undertemperature interrupts, one-shot, continuous conversion, interrupt pin polarity, and overtemperature fault queues. Table 8. Configuration Register (Register Address 0x01) Bit(s) [1:0] Default Value 00 Type R/W Name Fault queue [2] 0 R/W CT pin polarity [3] 0 R/W INT pin polarity [4] 0 R/W INT/CT mode [6:5] 00 R/W Operation mode [7] 0 R/W Resolution Description These two bits set the number of undertemperature/overtemperature faults that can occur before setting the INT and CT pins. This helps to avoid false triggering due to temperature noise. 00 = 1 fault (default). 01 = 2 faults. 10 = 3 faults. 11 = 4 faults. This bit selects the output polarity of the CT pin. 0 = active low. 1 = active high. This bit selects the output polarity of the INT pin. 0 = active low. 1 = active high. This bit selects comparator mode or interrupt mode. 0 = interrupt mode. 1 = comparator mode. These two bits set the operational mode of the ADT7320. 00 = continuous conversion (default). When one conversion is finished, the ADT7320 begins the next conversion. 01 = one-shot mode. Conversion time is typically 240 ms. 10 = 1 SPS mode. Conversion time is typically 60 ms. This operational mode reduces the average current consumption. 11 = shutdown. All circuitry except for the interface circuitry is powered down. This bit sets the resolution of the ADC when converting. 0 = 13-bit resolution. Sign bit + 12 bits gives a temperature resolution of 0.0625°C. 1 = 16-bit resolution. Sign bit + 15 bits gives a temperature resolution of 0.0078°C. Rev. 0 | Page 14 of 24 Data Sheet ADT7320 TEMPERATURE VALUE REGISTER ID REGISTER The temperature value register stores the temperature measured by the internal temperature sensor. The temperature is stored in a 16-bit, twos complement format. The temperature is read back from the temperature value register (Register Address 0x02) as a 16-bit value. This 8-bit read-only register (Register Address 0x03) stores the manufacturer ID in Bit 7 to Bit 3 and the silicon revision in Bit 2 to Bit 0. The default setting for the ID register is 0xC3. Bit 2, Bit 1, and Bit 0 are event alarm flags for TCRIT, THIGH, and TLOW, respectively. When the ADC is configured to convert the temperature to a 16-bit digital value, Bit 2, Bit 1, and Bit 0 are no longer used as flag bits and are, instead, used as the LSB bits for the extended digital value. TCRIT SETPOINT REGISTER The 16-bit TCRIT setpoint register (Register Address 0x04) stores the critical overtemperature limit value. A critical overtemperature event occurs when the temperature value stored in the temperature value register exceeds the value stored in this register. The CT pin is activated if a critical overtemperature event occurs. The temperature is stored in twos complement format with the MSB being the temperature sign bit. The default setting for the TCRIT setpoint is 147°C. Table 9. Temperature Value Register (Register Address 0x02) Bit(s) [0] Default Value 0 Type R Name TLOW flag/LSB0 [1] 0 R THIGH flag/LSB1 [2] 0 R TCRIT flag/LSB2 [7:3] [14:8] 15 00000 0000000 0 R R R Temp Temp Sign Description Flags a TLOW event if the configuration register, Register Address 0x01[7] = 0 (13-bit resolution). When the temperature value is below TLOW, this bit is set to 1. Contains Least Significant Bit 0 of the 15-bit temperature value when the configuration register, Register Address 0x01[7] = 1 (16-bit resolution). Flags a THIGH event if the configuration register, Register Address 0x01[7] = 0 (13-bit resolution). When the temperature value is above THIGH, this bit is set to 1. Contains Least Significant Bit 1 of the 15-bit temperature value when the configuration register, Register Address 0x01[7] = 1 (16-bit resolution). Flags a TCRIT event if the configuration register, Register Address 0x01[7] = 0 (13-bit resolution). When the temperature value exceeds TCRIT, this bit is set to 1. Contains the Least Significant Bit 2 of the 15-bit temperature value if the configuration register, Register Address 0x01[7] = 1 (16-bit resolution). Temperature value in twos complement format. Temperature value in twos complement format. Sign bit; indicates if the temperature value is negative or positive. Table 10. ID Register (Register Address 0x03) Bit(s) [2:0] [7:3] Default Value 011 11000 Type R R Name Revision ID Manufacturer ID Description Contains the silicon revision identification number. Contains the manufacturer identification number. Table 11. TCRIT Setpoint Register (Register Address 0x04) Bit(s) [15:0] Default Value 0x4980 Type R/W Name TCRIT Description 16-bit critical overtemperature limit, stored in twos complement format. Rev. 0 | Page 15 of 24 ADT7320 Data Sheet THYST SETPOINT REGISTER TLOW SETPOINT REGISTER The 8-bit THYST setpoint register (Register Address 0x05) stores the temperature hysteresis value for the THIGH, TLOW, and TCRIT temperature limits. The temperature hysteresis value is stored in straight binary format using the four LSBs. Increments are possible in steps of 1°C from 0°C to 15°C. The value in this register is subtracted from the THIGH and TCRIT values and added to the TLOW value to implement hysteresis. The 16-bit TLOW setpoint register (Register Address 0x07) stores the undertemperature limit value. An undertemperature event occurs when the temperature value stored in the temperature value register is less than the value stored in this register. The INT pin is activated if an undertemperature event occurs. The temperature is stored in twos complement format with the MSB being the temperature sign bit. The default setting for the THYST setpoint is 5°C. The default setting for the TLOW setpoint is 10°C. THIGH SETPOINT REGISTER The 16-bit THIGH setpoint register (Register Address 0x06) stores the overtemperature limit value. An overtemperature event occurs when the temperature value stored in the temperature value register exceeds the value stored in this register. The INT pin is activated if an overtemperature event occurs. The temperature is stored in twos complement format with the most significant bit being the temperature sign bit. The default setting for the THIGH setpoint is 64°C. Table 12. THYST Setpoint Register (Register Address 0x05) Bit(s) [3:0] Default Value 0101 Type R/W Name THYST Description Hysteresis value, from 0°C to 15°C. Stored in straight binary format. The default setting is 5°C. [7:4] 0000 R/W N/A N/A = not applicable. Not used. Table 13. THIGH Setpoint Register (Register Address 0x06) Bit(s) [15:0] Default Value 0x2000 Type R/W Name THIGH Description 16-bit overtemperature limit, stored in twos complement format. Table 14. TLOW Setpoint Register (Register Address 0x07) Bit(s) [15:0] Default Value 0x0500 Type R/W Name TLOW Description 16-bit undertemperature limit, stored in twos complement format. Rev. 0 | Page 16 of 24 Data Sheet ADT7320 SERIAL INTERFACE PULL-UP TO VDD VDD VDD ADT7320 SCLK DOUT DIN CS 10kΩ GND CT INT 09012-014 MICROCONTROLLER 10kΩ 0.1µF Figure 14. Typical SPI Interface Connection The ADT7320 has a 4-wire serial peripheral interface (SPI). The interface has a data input pin (DIN) for writing data to the device, a data output pin (DOUT) for reading data back from the device, and a serial data clock pin (SCLK) for clocking data into and out of the device. A chip select pin (CS) enables or disables the serial interface. CS is required for correct operation of the interface. Data is clocked out of the ADT7320 on the falling edge of SCLK, and data is clocked into the device on the rising edge of SCLK. Bit C7, Bit C2, Bit C1, and Bit C0 of the command byte must all be set to 0 to successfully begin a bus transaction. The SPI interface does not work correctly if a 1 is written into any of these bits. Bit C6 is the read/write bit; 1 indicates a read, and 0 indicates a write. Bits[C5:C3] contain the target register address. One register can be read from or written to per bus transaction. SPI COMMAND BYTE All data transactions on the bus begin with the master taking CS from high to low and sending out the command byte. The command byte indicates to the ADT7320 whether the transaction is a read or a write and provides the address of the register for the data transfer. Table 15 shows the command byte. Table 15. Command Byte C7 0 C6 R/W C5 C4 C3 Register address C2 0 C1 0 C0 0 Rev. 0 | Page 17 of 24 ADT7320 Data Sheet Figure 15 shows a write to an 8-bit register, and Figure 16 shows a write to a 16-bit register. WRITING DATA Data is written to the ADT7320 in 8 bits or 16 bits, depending on the addressed register. The first byte written to the device is the command byte, with the read/write bit set to 0. The master then supplies the 8-bit or 16-bit input data on the DIN line. The ADT7320 clocks the data into the register addressed in the command byte on the rising edge of SCLK. The master finishes the write transaction by pulling CS high. The master must begin a new write transaction on the bus for every register write. Only one register is written to per bus transaction. CS 1 2 3 4 5 6 7 8 9 10 11 C7 DIN R/W REGISTER ADDR C6 C4 C5 C3 13 14 15 16 8-BIT DATA 8-BIT COMMAND BYTE 0 12 0 0 0 C2 C1 C0 D7 D6 D5 D4 D3 D2 D1 09012-128 SCLK D0 Figure 15. Writing to an 8-Bit Register CS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 DIN R/W C7 C6 REGISTER ADDR C5 C4 C3 16 17 22 23 24 16-BIT DATA 8-BIT COMMAND BYTE 0 15 0 0 0 C2 C1 C0 D15 D14 D13 D12 D11 D10 Figure 16. Writing to a 16-Bit Register Rev. 0 | Page 18 of 24 D9 D8 D7 D2 D1 D0 09012-129 SCLK Data Sheet ADT7320 CS SCLK 2 1 4 3 5 7 6 9 8 11 10 12 13 14 16 15 8-BIT COMMAND BYTE DIN 0 R/W C7 C6 REGISTER ADDR C5 C4 C3 0 0 0 C2 C1 C0 D7 D6 D5 D4 D3 D2 15 16 17 D1 09012-030 8-BIT DATA DOUT D0 Figure 17. Reading from an 8-Bit Register CS SCLK 1 2 3 4 5 6 7 8 9 10 11 12 13 14 22 23 24 8-BIT COMMAND BYTE DIN 0 R/W C7 C6 REGISTER ADDR 0 0 0 C4 C2 C1 C0 C5 C3 DOUT D15 D14 D13 D12 D11 D10 D9 D8 D7 D2 D1 D0 09012-031 16-BIT DATA Figure 18. Reading from a 16-Bit Register READING DATA A read transaction begins when the master writes the command byte to the ADT7320 with the read/write bit set to 1. The master then supplies 8 or 16 clock pulses, depending on the addressed register, and the ADT7320 clocks out data from the addressed register on the DOUT line. Data is clocked out on the first falling edge of SCLK following the command byte. The read transaction finishes when the master pulls CS high. INTERFACING TO DSPs OR MICROCONTROLLERS The ADT7320 can be operated with CS used as a frame synchronization signal. This setup is useful for DSP interfaces. In this case, the first bit (MSB) is effectively clocked out by CS because CS normally occurs after the falling edge of SCLK in DSPs. SCLK can continue to run between data transfers, provided that the timing values are obeyed. CS can be tied to ground and the serial interface can operate in a 3-wire mode. DIN, DOUT, and SCLK are used to communicate with the ADT7320 in this mode. For microcontroller interfaces, it is recommended that SCLK idle high between data transfers. SERIAL INTERFACE RESET The serial interface can be reset by writing a series of 1s on the DIN input. If a Logic 1 is written to the ADT7320 DIN line for at least 32 serial clock cycles, the serial interface is reset. This ensures that the interface can be reset to a known state if the interface is lost due to a software error or a glitch in the system. A reset returns the interface to the state in which it expects a write to a communications register. This operation resets the contents of all registers to their power-on values. Following a reset, allow a period of 500 μs before addressing the serial interface. Rev. 0 | Page 19 of 24 ADT7320 Data Sheet INT AND CT OUTPUTS Comparator Mode The INT and CT pins are open-drain outputs, and both pins require a 10 kΩ pull-up resistor to VDD. The ADT7320 must be fully powered up to VDD before reading INT and CT data. In comparator mode, the INT pin returns to its inactive status when the temperature drops below the THIGH − THYST limit or rises above the TLOW + THYST limit. UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION Placing the ADT7320 into shutdown mode does not reset the INT state in comparator mode. The INT and CT pins have two undertemperature/overtemperature modes: comparator mode and interrupt mode. The interrupt mode is the default power-up overtemperature mode. The INT output pin becomes active when the temperature is greater than the temperature stored in the THIGH setpoint register or less than the temperature stored in the TLOW setpoint register. How this pin reacts after an undertemperature or overtemperature event depends on the overtemperature mode selected. Interrupt Mode In interrupt mode, the INT pin returns to its inactive status when any ADT7320 register is read. When the INT pin is reset, it becomes active again only when the temperature is greater than the temperature stored in the THIGH setpoint register or less than the temperature stored in the TLOW setpoint register. Placing the ADT7320 into shutdown mode resets the INT pin in interrupt mode. Figure 19 illustrates the comparator and interrupt modes for events exceeding the THIGH limit with both pin polarity settings. Figure 20 illustrates the comparator and interrupt modes for events exceeding the TLOW limit with both pin polarity settings. TEMPERATURE 82°C 81°C THIGH 80°C 79°C 78°C 77°C 76°C THIGH – THYST 75°C 74°C 73°C INT PIN (COMPARATOR MODE) POLARITY = ACTIVE LOW INT PIN (INTERRUPT MODE) POLARITY = ACTIVE LOW INT PIN (COMPARATOR MODE) POLARITY = ACTIVE HIGH TIME READ READ READ Figure 19. INT Output Temperature Response for THIGH Overtemperature Events Rev. 0 | Page 20 of 24 09012-020 INT PIN (INTERRUPT MODE) POLARITY = ACTIVE HIGH Data Sheet ADT7320 TEMPERATURE –13°C –14°C TLOW + THYST –15°C –16°C –17°C –18°C –19°C TLOW –20°C –21°C –22°C INT PIN (COMPARATOR MODE) POLARITY = ACTIVE LOW INT PIN (INTERRUPT MODE) POLARITY = ACTIVE LOW INT PIN (COMPARATOR MODE) POLARITY = ACTIVE HIGH TIME READ READ READ Figure 20. INT Output Temperature Response for TLOW Undertemperature Events Rev. 0 | Page 21 of 24 09012-021 INT PIN (INTERRUPT MODE) POLARITY = ACTIVE HIGH ADT7320 Data Sheet APPLICATIONS INFORMATION THERMAL RESPONSE TIME POWERING FROM A SWITCHING REGULATOR Thermal response is a function of the thermal mass of the temperature sensor, but it is also heavily influenced by the mass of the object that the IC is mounted to. For example, a large PCB containing large amounts of copper tracing can act as a large heat sink and slow the thermal response. For a faster thermal response, it is recommended that the sensor be mounted on a PCB that is as small as possible. Precision analog devices such as the ADT7320 require a wellfiltered power source. If the ADT7320 is powered from a switching regulator, noise may be generated above 50 kHz that may affect the temperature accuracy specifications. To prevent this, an RC filter should be used between the power supply and ADT7320 VDD. The value of the components used should be carefully considered to ensure that the peak value of the supply noise is less than 1 mV. The RC filter should be mounted as far away as possible from the ADT7320 to ensure that the thermal mass is kept as low as possible. Figure 10 shows the typical response time of less than 2 seconds to reach 63.2% of the temperature span of the DUT. The temperature values are the digital bytes read back through the digital interface. The response time includes all delays incurred on chip during signal processing. SUPPLY DECOUPLING The ADT7320 must have a decoupling capacitor connected between VDD and GND; otherwise, incorrect temperature readings will be obtained. A 0.1 μF decoupling capacitor, such as a high frequency ceramic type, must be used and mounted as close as possible to the VDD pin of the ADT7320. If possible, the ADT7320 should be powered directly from the system power supply. This arrangement, shown in Figure 21, isolates the analog section from the logic switching transients. Even if a separate power supply trace is not available, generous supply bypassing reduces supply line induced errors. Local supply bypassing consisting of a 0.1 μF ceramic capacitor is critical for the temperature accuracy specifications to be achieved. TTL/CMOS LOGIC CIRCUITS 0.1µF TEMPERATURE MEASUREMENT The ADT7320 accurately measures and converts the temperature at the surface of its own semiconductor chip. Thermal paths run through the leads, the exposed pad, as well as the plastic package. When the ADT7320 is used to measure the temperature of a nearby heat source, the thermal impedance between the heat source and the ADT7320 must be considered because this impedance affects the accuracy and thermal response of the measurement. For air or surface temperature measurements, take care to isolate the package, leads, and exposed pad from ambient air temperature. Use of a thermally conductive adhesive can help to achieve a more accurate surface temperature measurement. QUICK GUIDE TO MEASURING TEMPERATURE The following is a quick guide for measuring temperature in continuous conversion mode (default power-up mode). Execute each step sequentially. 1. ADT7320 POWER SUPPLY 09012-022 2. 3. Figure 21. Use of Separate Traces to Reduce Power Supply Noise 4. Rev. 0 | Page 22 of 24 After power-up, reset the serial interface (load 32 consecutive 1s on DIN). This ensures all internal circuitry is properly initialized. Verify the setup by reading the device ID (Register Address 0x03). It should read 0xC3. After consistent consecutive readings are obtained from Step 2, read the configuration register (Register Address 0x01), TCRIT (Register Address 0x04), THIGH (Register Address 0x06), and TLOW (Register Address 0x07). Compare these values with the specified defaults in Table 6. If all the readings match, the interface is operational. Write to the configuration register to set the ADT7320 to the desired configuration. Read the temperature value register. It should produce a valid temperature measurement. Data Sheet ADT7320 OUTLINE DIMENSIONS PIN 1 INDICATOR 4.10 4.00 SQ 3.90 0.35 0.30 0.25 0.65 BSC 16 13 PIN 1 INDICATOR 12 1 EXPOSED PAD 4 2.70 2.60 SQ 2.50 9 0.80 0.75 0.70 0.45 0.40 0.35 8 0.05 MAX 0.02 NOM COPLANARITY 0.08 0.20 REF SEATING PLANE 5 BOTTOM VIEW 0.20 MIN FOR PROPER CONNECTION OF THE EXPOSED PAD, REFER TO THE PIN CONFIGURATION AND FUNCTION DESCRIPTIONS SECTION OF THIS DATA SHEET. COMPLIANT TO JEDEC STANDARDS MO-220-WGGC. 08-16-2010-C TOP VIEW Figure 22. 16-Lead Lead Frame Chip Scale Package [LFCSP_WQ] 4 mm × 4 mm Body, Very Very Thin Quad (CP-16-17) Dimensions shown in millimeters ORDERING GUIDE Model 1 ADT7320UCPZ-R2 ADT7320UCPZ-RL7 EVAL-ADT7X20EBZ 1 2 Temperature Range 2 −40°C to +150°C −40°C to +150°C Package Description 16-lead LFCSP_WQ 16-Lead LFCSP_WQ Evaluation Board Z = RoHS Compliant Part. Operating at extended temperatures over prolonged periods may shorten the lifetime performance of the part. Rev. 0 | Page 23 of 24 Package Option CP-16-17 CP-16-17 ADT7320 Data Sheet NOTES ©2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D09012-0-12/12(0) Rev. 0 | Page 24 of 24