NCT1008 1 C Temperature Monitor with Series Resistance Cancellation The NCT1008 is a dual-channel digital thermometer and undertemperature/overtemperature alarm, intended for use in PCs and NCT1008 CONVERSION RATE ON-CHIP ADDRESS POINTER REGISTER TEMPERATURE REGISTER SENSOR LOCAL TEMPERATURE LOCAL TEMPERATURE LOW-LIMIT REGISTER VALUE REGISTER LOCAL TEMPERATURE D+ 2 HIGH-LIMIT REGISTER ANALOG A-TO-D MUX CONVERTER D REMOTE TEMPERATURE 3 LOW-LIMIT REGISTER RUN/STANDBY BUSY REMOTE TEMPERATURE REMOTE TEMPERATURE HIGH-LIMIT REGISTER VALUE REGISTER LOCAL THERM LIMIT REGISTERS REMOTE OFFSET EXTERNAL THERM REGISTER LIMIT REGISTERS CONFIGURATION REGISTERS EXTERNAL DIODE OPEN-CIRCUIT INTERRUPT STATUS REGISTERS MASKING NCT1008 2 SMBus/I C INTERFACE 1 5 7 8 4 6 V GND SDATA SCLK THERM ALERT/THERM2 DD Figure 1. Functional Block Diagram Table 1. ABSOLUTE MAXIMUM RATINGS Parameter Rating Unit Positive Supply Voltage (V ) to GND 0.3, +3.6 V DD D+ 0.3 to V + 0.3 V DD D to GND 0.3 to +0.6 V SCLK, SDATA, ALERT, THERM 0.3 to +3.6 V Input Current, SDATA, THERM 1, +50 mA Input Current, D 1 mA ESD Rating, All Pins (Human Body Model) 1,500 V Maximum Junction Temperature (T ) 150 C J MAX Storage Temperature Range 65 to +150 C Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect device reliability. NOTE: This device is ESD sensitive. Use standard ESD precautions when handling. Table 2. THERMAL CHARACTERISTICS (Note 1) Package Type Unit JA JC 8-lead DFN 142 43.74 C/W 1. is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. JA