Analog Devices ADM1032ARM-1

SYSTEM TEMPERATURE MONITOR "Temperature Sensor Digital, Local/Remote 0°C ~ 100°C 7 b Micro8™"

SPECIALTY ANALOG CIRCUIT PDSO8

HIGH ACCURACY, REMOTE THERMAL DIODE MONITOR

The ADM10321 is a dual-channel digital thermometer and under/overtemperature alarm intended for use in PCs and thermal management systems. The device can measure the temperature of a remote thermal diode, which can be located on the processor die or can be a discrete device (2N3904/06), accurate to 1oC. A novel measurement technique cancels out the absolute value of the transistorR^s base emitter voltage so that no calibration is required. The ADM1032 also measures its ambient temperature. The ADM1032 communicates over a 2-wire serial interface compatible with system management bus (SMBus) standards. Under/overtemperature limits can be programmed into the device over the Sm Bus, and an ALERT output signals when the on-chip or remote temperature measurement is out of range. This output can be used as an interrupt or as a Sm Bus alert. The THERM output is a comparator output that allows CPU clock throttling or on/off control of a cooling fan. An ADM1032-1 and ADM1032-2 are available. The difference between the ADM1032 and theADM1032-1 is the default value of the external THERM limit. The ADM1032-2 has a different Sm Bus address. The Sm Bus address of theADM1032-2 is 0x4D. 1 Patents 5,982,221; 6,097,239; 6,133,753; 6,169,442; 5,867,012.