G7921
G7921 is Three Remote Temperature Sensors and One Fan Controllers manufactured by Global Mixed-mode Technology.
- Part of the G7921-GlobalMixed comparator family.
- Part of the G7921-GlobalMixed comparator family.
Global Mixed-mode Technology Inc.
Three Remote Temperature Sensors and One Fan Controllers with SMBus Serial Interface and System Reset Circuit
Features
- Measures Three Remote Temperatures
- Adjustable Offset for Each Sensor via SMBus
- Accuracy: ±1°C (+ 60°C to + 100°C)
±3°C (- 10°C to + 120°C)
- +4.5V to +5.5V Supply Range
- Programmable Hardware Thermal Shutdown for Sensor 2 and Programmable Software Thermal Shutdown for Sensor 1, 3.
- SMBus 2-Wire Serial Interface With Writting Protection Function.
- Alert Signal for Diode Fault, Fan Fail, and Fan Out of Control
- Supports SMBus Alert Response
- Fan Drivers Using Linear Control Algorithm with Built-in MOSFET
- Closed Loop Speed Control and programmable 8 Bits Open Loop Voltage Control for Fan1
- Wide speed control range for Fan1, Accuracy within 2%, when SET_CNT1 > 50
- Internal Current- limit and Over-temperature Protection for the Fan
- Reset Function Precision Monitoring of 5V Power-Supply Voltage
- Measure Thermal Diode with Transistor Model
- Support 45nm, 65nm and 90nm CPU thermal diode
- 20-Pin SSOP Package
Applications
- Desktop and Notebook
- Central Office puters
- Tele Equipment
- Smart Battery Packs
- Industrial Controls
- LAN Servers
General Description
The G7921 contains 3 precise digital thermometers, one fan controllers, hardware and software thermal shutdown, and a system-reset circuit.
The thermometers report the temperature of 3 remote sensors. The remote sensors are diode-connected transistors typically a low-cost, easily mounted 2N3904 NPN type or the diode built-in in CPU. Remote accuracy is ±1°C for multiple transistor manufacturer. The G7921 also support offset adjust function via SMBus to fix the error due to different CPU diode or parasitic...
