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G781 Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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G781 Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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Ver: 1.0 Oct 02, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw 1 Global Mixed-mode Technology Inc. G781 ±1°C Remote and Local Temperature Sensor with SMBus Serial Interface Features Two Channels: Measures Both Remote and Local Temperatures No Calibration Required SMBus 2-Wire Serial Interface Programmable Under/Overtemperature Alarms Supports SMBus Alert Response Accuracy: ±1°C (+60°C to +100°C, remote) ±3°C (+60°C to + 100°C, local) 320µA (typ) Average Supply Current During Conversion +3V to +5.5V Supply Range Small 8-Lead SO Package Applications Desktop and Notebook Central Office Computers Telecom Equipment Smart Battery Packs Test and Measurement LAN Servers Multi-Chip Modules Industrial Controllers General Description The G781 is a precise digital thermometer that reports the temperature of both a remote sensor and its own package. The remote sensor is a diode-connected transistor typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermistors or thermocouples. Remote accuracy is ±1°C with no cali- bration needed. The remote channel can also meas- ure the die temperature of other ICs, such as micro- processors, that contain an on-chip, diode-connected transistor. 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 11bits plus sign, with each bit cor- responding to 0.125°C, 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. The G781 is available in a small, 8-pin SOP sur- face-mount package. Ordering Information PART* TEMP. RANGE PIN-PACKAGE G781 -20°C to +120°C 8-SOP Pin Configuration Typical Operating Circuit THERM 0.1µF 3V TO 5.5V VCC DXP DXN SMBCLK SMBDATA ALERT 10k Ω EACH CLOCK DATA INTERRUPT TO µC GND 2200pF 2N3904 DXN 8 6 5 1 2 3 4 VCC DXP SMBDATA SMBCLK GND 8 Pin SOP G781 7 ALERT THERM THERM 0.1µF 3V TO 5.5V VCC DXP DXN SMBCLK SMBDATA ALERT 10k Ω EACH CLOCK DATA INTERRUPT TO µC GND 2200pF 2N3904 DXN 8 6 5 1 2 3 4 VCC DXP SMBDATA SMBCLK GND 8 Pin SOP G781 7 ALERT THERM |
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