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G768B Datasheet(PDF) 1 Page - List of Unclassifed Manufacturers |
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G768B Datasheet(HTML) 1 Page - List of Unclassifed Manufacturers |
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1 / 15 page  Ver 1.3 Oct 28, 2002 TEL: 886-3-5788833 http://www.gmt.com.tw 1 G768B Global Mixed-mode Technology Inc. Remote/Local Temperature Sensor, 2 Fan Controllers with SMBus Serial Interface and System Reset Circuit Features Measures Two Remote and One Local Temperatures No Calibration Required SMBus 2-Wire Serial Interface Programmable Under/Over-temperature Alarms 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 Constant Fan Speed Control Built-in MOSFET switch Internal short-circuit protection PWM control for stable operation Watchdog for fan control 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 G768B contains a precise digital thermometer, 2 fan controllers, and a system-reset circuit. The G768B is backward compatible with G768, Except that there is an additional watchdog function. This function prevents fan from being out of control when system fails. The thermometer reports the temperature of 2 remote sensors and its own package. The remote sensors are diode-connected transistors typically a low-cost, easily mounted 2N3904 NPN type that replace conventional thermistors 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. G768B also contains a 2-channel fan speed controller. It connects directly to the fans and performs closed-loop control of the fan speed independently. The only external component required is a 10µF ca- pacitor per channel. It determines the current fan speed based on the fan rotation pulses and an exter- nally supplied clock. (To be continued) Ordering Information PART* TEMP. RANGE PIN-PACKAGE G768B -10°C to +85°C 16SSOP RESET SMBDATA 1 2 3 4 5 6 7 8 OUT1 Vcc DXP1 DXN DXP2 GND GND 16 15 14 13 12 11 10 9 OUT2 SMBCLK FG2 ALERT FG1 CLK 16Pin SSOP Vcc G768B |
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