G768D, G770, G770B Selling Leads, Datasheet
MFG:GMT Package Cooled:SSOP D/C:
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MFG:GMT Package Cooled:SSOP D/C:
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PDF/DataSheet Download
Datasheet: G760A
File Size: 177500 KB
Manufacturer: ETC [ETC]
Download : Click here to Download
PDF/DataSheet Download
Datasheet: G771
File Size: 274541 KB
Manufacturer: GMT [Global Mixed-mode Technology Inc]
Download : Click here to Download
PDF/DataSheet Download
Datasheet: G771
File Size: 274541 KB
Manufacturer: GMT [Global Mixed-mode Technology Inc]
Download : Click here to Download
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 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 (SMBusTM) 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 corresponding to 1, 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.
G768D also contains a 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 capacitor per channel. It determines the current fan speed based on the fan rotation pulses and an externally supplied 32.768KHz clock.