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G771 Datasheet(PDF) 1 Page - Global Mixed-mode Technology Inc |
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G771 Datasheet(HTML) 1 Page - Global Mixed-mode Technology Inc |
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1 / 15 page  Ver 0.2 Preliminary Dec 11, 2001 TEL: 886-3-5788833 http://www.gmt.com.tw 1 G771 Global Mixed-mode Technology Inc. Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit Features Measures Two Remote Temperatures No Calibration Required SMBus 2-Wire Serial Interface Programmable Under/Over-temperature Alarms Programmable Thermal Shutdown Signal Supports SMBus Alert Response Accuracy: ±5°C (-40°C to + 125°C, remote) ±3°C (+60°C to + 100°C, remote) 4.5V to 5.5V Supply Range Precision Monitoring of 5V Power-Supply Voltage 140ms Min Power-On Reset Pulse Width RESET Output Guaranteed RESET Valid to VCC=1V Power Supply Transient Immunity No External Components needed for reset function Small, 16-Pin SSOP Package Applications Desktop and Notebook Central Office Computers Telecom Equipment Smart Battery Packs Test and Measurement LAN Servers Multi-Chip Modules Industrial Controls Pin Configuration General Description The G771 contains a precise digital thermometer, a system-reset circuit, and a programmable thermal shutdown signal. The thermometer reports the temperature of 2 remote sensors. The remote sensors are diode-connected transistors typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermis- tors or thermocouples. Remote accuracy is ±5°C for multiple transistor manufacturers, with no calibration needed. The remote channel can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. The 2-wire serial interface accepts standard System Management Bus (SMBus TM) Write Byte, Read Byte, Send Byte, and Receive Byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit cor- responding to 1°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. Ordering Information PART* TEMP. RANGE PIN-PACKAGE G771 -55°C to +125°C 16SSOP TH_SHUT(push-pull) NC SMBDATA 1 2 3 4 5 6 7 8 NC Vcc DXP1 DXN DXP2 DGND AGND 16 15 14 13 12 11 10 9 SMBCLK NC ALERT NC RESET 16Pin SSOP NC G771 TH_SHUT(push-pull) NC SMBDATA 1 2 3 4 5 6 7 8 NC Vcc DXP1 DXN DXP2 DGND AGND 16 15 14 13 12 11 10 9 SMBCLK NC ALERT NC RESET 16Pin SSOP NC G771 |
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