ADT7483AARQZ-RL ON Semiconductor

ADT7483A Dual Channel Temperature Sensor and Over Temperature Alarm The ADT7483A is a three-channel digital thermometer and under/over temperature alarm, intended for use in PCs and thermal ADT7483A ADDRESS POINTER REGISTER CONVERSION RATE ON-CHIP ONE-SHOT REGISTER TEMPERATURE REGISTER SENSOR LOCAL TEMPERATURE LOCAL TEMPERATURE VALUE REGISTER THERM LIMIT REGISTER LOCAL TEMPERATURE D1+ 3 LOW LIMIT REGISTER 11-BIT A-TO-D D1 4 CONVERTER LOCAL TEMPERATURE ANALOG HIGH LIMIT REGISTER MUX BUSY RUN/STANDBY D2+ 12 REMOTE 1 & 2 TEMP. REMOTE 1 & 2 TEMP THERM LIMIT REG. D2 11 VALUE REGISTERS REMOTE 1 & 2 TEMP. LOW LIMIT REGISTERS REMOTE 1 & 2 TEMP REMOTE 1 & 2 TEMP. OFFSET REGISTERS HIGH LIMIT REGISTERS CONFIGURATION REGISTER EXTERNAL DIODE OPEN-CIRCUIT INTERRUPT STATUS REGISTERS MASKING ADT7483A SMBUS INTERFACE 2 6 16 1 14 15 5 13 V GND ADD0 ADD1 SDATA SCLK THERM ALERT/THERM2 DD Figure 1. Functional Block Diagram Table 1. PIN ASSIGNMENT Pin No. Mnemonic Description 1 ADD1 Address 1 Pin. Tri-state input to set the SMBus address. 2 V Positive Supply, 3 V to 3.6 V. B DD 3 D1+ Positive Connection. Connects to the first remote temperature sensor. 4 D1 Negative Connection. Connects to the first remote temperature sensor. 5 THERM Open-drain Output. Turns a fan on/off, or throttles a CPU clock in the event of an overtemperature condition. 6 GND Supply Ground Connection. 7 NC No Connect. 8 NC No Connect. 9 NC No Connect. 10 NC No Connect. 11 D2 Negative Connection. Connects to the second remote temperature sensor. 12 D2+ Positive Connection. Connects to the second remote temperature sensor. 13 ALERT/THERM2 Open-drain Logic Output. Used as interrupt or SMBus alert. This may also be configured as a second THERM output. Requires a pull-up resistor. 14 SDATA Logic Input/Output, SMBus Serial Data. Open-drain output. Requires a pull-up resistor. 15 SCLK Logic Input, SMBus Serial Clock. Requires a pull-up resistor. 16 ADD0 Address 0 Pin. Tri-state input to set the SMBus address.