Datasheet ADT7422 (Analog Devices) - 6

ADT7422 Data Sheet PIN CONFIGURATION AND FUNCTION DESCRIPTIONS C C C C NI NI NI NI 16 15 14 13 SCL 1 12 VDD SDA 2 11 GND ADT7422 A0 3 TOP VIEW 10 CT (Not to Scale) A1 4 9 INT 5 6 7 8 C C C C NI NI NI NI NOTES 1. NIC = NOT INTERNALLY CONNECTED. THE NIC PINS ARE NOT BONDED TO THE DIE INTERNALLY. 2. EXPOSED PAD. TO ENSURE CORRECT OPERATION, EITHER LEAVE THE EXPOSED PAD
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FLOATING OR CONNECT THE EXPOSED PAD TO GROUND. SOLDER THE EXPOSED PAD
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TO A PAD ON THE PCB TO CONFER MECHANICAL STRENGTH TO THE PACKAGE.
96 20 Figure 3. Pin Configuration
Table 5. Pin Function Descriptions Pin No. Mnemonic Description
1 SCL I2C Serial Clock Input, Open-Drain Configuration. The serial clock is used to clock in and clock out data to and from any register of the ADT7422. A pull-up resistor of typically 10 kΩ is required. 2 SDA I2C Serial Data Input/Output, Open-Drain Configuration. Serial data to and from the device is provided on this pin. A pull-up resistor of typically 10 kΩ is required. 3 A0 I2C Serial Bus Address Selection Pin, Logic Input. Connect this pin to GND or VDD to set an I2C address. 4 A1 I2C Serial Bus Address Selection Pin, Logic Input. Connect this pin to GND or VDD to set an I2C address. 5 to 8, 13 to 16 NIC Not Internally Connected. The NIC pins are not bonded to the die internally. 9 INT Overtemperature and Undertemperature Indicator, Logic Output, Open-Drain Configuration. Power-up default setting is an active low comparator interrupt. A pull-up resistor of typically 10 kΩ is required. 10 CT Critical Overtemperature Indicator, Logic Output, Open-Drain Configuration. Power-up default polarity is active low. A pull-up resistor of typically 10 kΩ is required. 11 GND Analog and Digital Ground. 12 VDD Positive Supply Voltage (2.7 V to 3.3 V). The supply can be decoupled with a 0.1 μF ceramic capacitor to ground. EPAD Exposed Pad. To ensure correct operation, either leave the exposed pad floating or connect the exposed pad to ground. Solder the exposed pad to a pad on the PCB to confer mechanical strength to the package. Rev. 0 | Page 6 of 23 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION PRODUCT HIGHLIGHTS FUNCTIONAL BLOCK DIAGRAM TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS I2C TIMING SPECIFICATIONS Timing Diagram ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CIRCUIT INFORMATION CONVERTER DETAILS NORMAL MODE ONE SHOT MODE CT and INT Operation in One Shot Mode 1 SPS MODE SHUTDOWN MODE FAULT QUEUE TEMPERATURE DATA FORMAT TEMPERATURE CONVERSION FORMULAS 16-Bit Temperature Data Format 13-Bit Temperature Data Format 10-Bit Temperature Data Format 9-Bit Temperature Data Format REGISTERS ADDRESS POINTER REGISTER TEMPERATURE VALUE REGISTERS STATUS REGISTER CONFIGURATION REGISTER THIGH SETPOINT REGISTERS TLOW SETPOINT REGISTERS TCRIT SETPOINT REGISTERS THYST SETPOINT REGISTER ID REGISTER SERIAL INTERFACE SERIAL BUS ADDRESS WRITING DATA READING DATA RESET GENERAL CALL INT AND CT OUTPUTS UNDERTEMPERATURE AND OVERTEMPERATURE DETECTION Comparator Mode Interrupt Mode APPLICATIONS INFORMATION THERMAL RESPONSE TIME SUPPLY DECOUPLING POWERING FROM A SWITCHING REGULATOR TEMPERATURE MEASUREMENT QUICK GUIDE TO MEASURING TEMPERATURE OUTLINE DIMENSIONS ORDERING GUIDE