NCT210 Low Cost Microprocessor System Temperature Monitor Microcomputer The NCT210 is a two-channel digital thermometer and under/overtemperature alarm, intended for use in personal computers NCT210 ADDRESS POINTER REGISTER ONE-SHOT REGISTER CONVERTION RATE ON-CHIP REGISTER TEMPERATURE SENSOR LOCAL TEMPERATURE LOCAL TEMPERATURE LOCAL TEMPERATURE VALUE REGISTER LOW LIMIT COMPARATOR LOW LIMIT REGISTER LOCAL TEMPERATURE LOCAL TEMPERATURE D+ 3 HIGH LIMIT COMPARATOR HIGH LIMIT REGISTER A-TO-D ANALOG MUX CONVERTER D 4 REMOTE TEMPERATURE REMOTE TEMPERATURE BUSY RUN/STANDBY LOW LIMIT COMPARATOR LOW LIMIT REGISTER REMOTE TEMPERATURE REMOTE TEMPERATURE REMOTE TEMPERATURE VALUE REGISTER HIGH LIMIT COMPARATOR HIGH LIMIT REGISTER CONFIGURATION REGISTER 15 STBY EXTERNAL DIODE OPEN-CIRCUIT INTERRUPT 11 ALERT STATUS REGISTER MASKING NCT210 SMBus INTERFACE 1 2 5 7 8 9 13 16 12 14 10 6 NC V NC GND GND NC NC NC SDATA SCLK ADD0 ADD1 NC = NO CONNECT DD Figure 1. Functional Block Diagram Table 1. PIN ASSIGNMENT Pin No. Mnemonic Description 1 NC No Connect 2 V Positive Supply, 3.0 V to 5.5 V DD 3 D+ Positive Connection to Remote Temperature Sensor 4 D Negative Connection to Remote Temperature Sensor 5 NC No Connect 6 ADD1 Three-state Logic Input, Higher Bit of Device Address 7 GND Supply 0 V Connection 8 GND Supply 0 V Connection 9 NC No Connect 10 ADD0 Three-state Logic Input, Lower Bit of Device Address 11 ALERT Open-drain Logic Output Used as Interrupt or SMBus ALERT 12 SDATA Logic Input/Output, SMBus Serial Data. Open-drain Output 13 NC No Connect 14 SCLK Logic Input, SMBus Serial Clock 15 STBY Logic Input Selecting Normal Operation (High) or Standby Mode (Low) 16 NC No Connect