ADM1032 Datasheet | Analog Devices

a Features On-Chip and Remote Temperature Sensing Offset Registers for System Calibration 0.125؇ C Resolution/1؇ C Accuracy on Remote Channel 1 ؇ C Resolution/3؇C Accuracy on Local Channel Fast (Up to 64 Measurements per Second) 2-Wire SMBus Serial Interface Supports SMBus Alert Programmable Over/Under Temperature Limits Programmable Fault Queue Over-Temperature Fail-Safe THERM Output Programmable THERM Limits Programmable THERM Hysteresis 170 ␮A Operating Current 5.5 ␮A Standby Current 3 V to 5.5 V Supply Small 8-Lead SO and Micro_SO Package APPLICATIONS Desktop puters Notebook puters Smart Batteries Industrial Controllers Telems Equipment Instrumentation Embedded Systems ؎1؇C Remote and Local System Temperature Monitor ADM1032- PRODUCT DESCRIPTION The ADM1032 is a dual-channel digital thermometer and under/over temperature alarm, intended for use in personal puters and thermal management systems. The higher 1°C accuracy offered allows systems designers to safely reduce temperature guardbanding and increase system performance. The device can measure the temperature of a microprocessor using a diode-connected NPN or PNP transistor, which may be provided on-chip or can be a low-cost discrete device such as the 2N3906. A novel measurement technique cancels out the absolute value of the transistor’s base emitter voltage, so that no calibration is required. The second measurement channel measures the output of an on-chip temperature sensor, to monitor the temperature of the device and its environment. The ADM1032 municates over a two-wire serial interface patible with System Management Bus (SMBus) standards. Under and over temperature limits can be programmed into the device over the serial 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 an SMBus alert. The THERM output is a parator output that allows CPU clock throttling or on/off control of a...