FIRST DUAL-ALARM, REMOTE/LOCAL TEMPERATURE SENSOR WITH SMBus INTERFACE
SUNNYVALE, CA—May 5, 1999—Maxim Integrated Products introduces the MAX1619, the first remote temperature sensor with remote dual-alarm outputs, one of which can be used to activate CPU fan control without system intervention. The MAX1619 is a precise digital thermometer (3°C remote accuracy, 2°C local accuracy) that measures the die temperature directly via an on-chip CPU thermal diode, replacing conventional thermistors or thermocouples. This allows the highest possible clock rates while keeping within the CPU thermal envelope. The remote overtemperature output is an unlatched, open-drain output that behaves as a thermostat; it can directly control a fan to reduce heat buildup, improve efficiency, and protect notebook computers against potentially destructive thermal overloads.
The two-wire serial interface accepts standard System Management Bus (SMBus™) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and read temperature data. Measurements can be taken automatically and autonomously, with the conversion rate programmed by the user or programmed to operate in a single-shot mode.
The MAX1619 is available in a space-saving 16-pin QSOP package and is guaranteed for the military temperature range (-55°C to +125°C). Prices start from $2.96 (1000-up, FOB USA). A preassembled evaluation kit (MAX1619EVKIT) is available with recommended external components to reduce design time.
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