G7811 Global Mixed-mode Technology Inc. ±3°C Local Temperature Sensor with SMBus Serial Interface Features General Description The G7811 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. Measures Local Temperatures No Calibration Required SMBus 2-Wire Serial Interface Programmable Under/Overtemperature Alarms Supports SMBus Alert Response Accuracy: ±3°C (+60°C to + 100°C, local) 320µA (typ) Average Supply Current During Conversion +3V to +5.5V Supply Range Small 8-Lead MSOP Package The 2-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 to read temperature data. The data format is in two’s-complement format. Measurements can be done automatically and autonomously, with the conversion rate programmed by the user or programmed to operate in a single-shot mode. The adjustable rate allows the user to control the supply current drain. Applications Desktop and Notebook Computers Smart Battery Packs LAN Servers Industrial Controllers Central Office Telecom Equipment Test and Measurement Multi-Chip Modules The G7811 is available in a small, 8-pin MSOP surface-mount package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G7811P81U G7811 -55°C to +125°C MSOP-8 Note: P8 : MSOP-8 1: Bonding Code U: Tape & Reel Pin Configuration Typical Application Circuit 3V TO 5.5V 0.1µF G7811 VCC 1 8 SMBCLK TST1 2 7 SMBDATA TST2 3 6 VCC SMBCLK SMBDATA ALERT GND THERM 4 5 10kΩ EACH GND ALERT CLOCK DATA INTERRUPT TO µC THERM MSOP-8 Ver: 0.3 Jun 16, 2009 TEL: 886-3-5788833 http://www.gmt.com.tw 1