G7931 G7932 台湾致新代理商 GMT 温度传感器和风扇控制器和风扇驱动器系列带风扇控制器的热传感器

台湾致新G7931 G7932

首页产品传感器温度传感器致新科技GMT温度传感器台湾致新G7931 G7932

G7931 G7932 台湾致新代理商 GMT 温度传感器和风扇控制器和风扇驱动器系列带风扇控制器的热传感器
Two Remote and One Local Temperature Sensors and 3/4 Fan Controllers with SMBus Interface

Part Number

Vin (V)min.

Vin (V) max.

Remote CH

Local CH

Fan CH

Slave
Address

Accuracy (°C)

Note

Package

G7931

4.5

5.5

Selectable

±1

ADD0 for address selection

TSSOP-20-4

Part Number	Vin (V)min.	Vin (V) max.	Remote CH	Local CH	Fan CH	Slave Address	Accuracy (°C)	Note	Package
G7932	4.5	5.5	2	1	4	111001	±1	Build-in clock	TSSOP-20-4

General Description
The G7931/G7932 contains 3 precise digital thermometers, 3/4 fan controllers, fan failure detection.

The thermometers report the temperature of 2 remote sen-sors and 1 local sensor. The remote sensors are di-ode-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 manufac-turer. Local accuracy is ±3°C. The G7931/G7932 also sup-port offset adjust function via SMBus to fix the error due to different CPU diode or parasitic resistors.

The 2-wire serial interface accepts standard System Man-agement Bus (SMBusTM) Write Byte, Read Byte, Send Byte, and Receive Byte commands. The SMBus address is 70h 72h for write and 7173hh for read for G7932.For G7931, ADD0 pin selects 3 different SMBus addresses. (see “ SMBus Digital Interface” section)

G7931/G7932 contains 3/4 fan controllers which perform closed-loop and open-loop control. G7931/ G7932 deter-mines the current fan speed based on the FG inputs and an externally supplied 32.768kHz clock. The driving ability is 5mA. G7931/G7932 also provides ALERT for fan fail and out of control event.

SMBusTM is a trademark of Intel Corp

Features
Measures Two Remote and One Local Tempera-tures
Adjustable Offset for Each Sensor via SMBus
Accuracy: Remote ±1°C (+20°C to +80°C) ±3°C (-10°C to +120°C)
+4.5V to +5.5V Supply Range
Alert Signal for Diode Fault, Fan Fail, and Fan Out of Control
Supports SMBus Alert Response
Fan Drivers Using Linear
Control Algorithm Closed Loop Speed Control and programmable 8 Bits Open Loop Voltage Control for Fan
Wide speed control range for Fan, Accuracy within 2%, when FANx_SET_CNT > 50
Internal Current-limit and Over-temperature Protection for the Fan Controllers
Build-In Inverters for Driving Crystal
Optional Internal Clock Accuracy ±3% from 20°C to 80°C at 5V VCC
20-Pin TSSOP Package

Applications
Projector, LCD TV, PDP TV
Desktop and Notebook
Central Office Computers
Telecom Equipments
Industrial Controls
LAN Servers

Ordering Information