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	2	1	3	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

ORDER NUMBER	MARKING	TEMP. RANGE	PACKAGE (Green)
G7931D51U	G7931	~55°C to 125°C	TSSOP-20
G7932D51U	G7932	~55°C to 125°C	TSSOP-20

Note: D5: TSSOP-20           1:  Bonding  Code            U:  Tape  &  Reel

Pin Configuration

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