General Description
The G768D contains a precise digital thermometer, a fan controller, and a system-reset circuit.
Except for one less fan controller, G768D is backward compatible with G768B. G768D has 2 more functions, fan-failure detection and 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 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.

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
■ Fan speed control range: 3,000 to 30,000 rpm
■ Fan speed accuracy: ±2%
■ Built-in MOSFET switch
■ Internal current-limit and over-temperature protection for fan control
■ Watchdog for fan control
■ Alarm for fan failure
■ Precision Monitoring of 5V Power-Supply Voltage
■ 340ms Typical 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