Global Mixed-mode Technology Inc.
G793/G794
Two Remote and One Local Temperature Sensors
and 3/4 Fan Controllers with SMBus Interface
Features
General Description
Measures Two Remote and One Local Tem-
The G793/G794 contains 3 precise digital thermome-
ters, 3/4 fan controllers, fan failure detection.
peratures
Adjustable Offset for Each Sensor via SMBus
Accuracy: Remote ±1°C (+20°C to +80°C)
±3°C (-10°C to +120°C)
The thermometers report the temperature of 2 remote
sensors 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 manu-
facturer. Local accuracy is ±3°C. The G793/G794 also
support offset adjust function via SMBus to fix the error
due to different CPU diode or parasitic resistors.
+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
20-Pin TSSOP Package
The 2-wire serial interface accepts standard System
Management Bus (SMBusTM) Write Byte, Read Byte,
Send Byte, and Receive Byte commands. The SMBus
address is 72h for write and 73h for read.
G793/G794 contains 3/4 controllers. FAN controller per-
forms closed-loop and open-loop control. G793/G794
determines the current fan speed based on the FG inputs
and an externally supplied 32.768kHz clock. The driving
ability is 5mA. G793/G794 also provides ALERT for fan
fail and out of control event.
Applications
Projector, LCD TV, PDP TV
Desktop and Notebook
Central Office Computers
Telecom Equipments
Industrial Controls
SMBusTM is a trademark of Intel Corp
LAN Servers
Ordering Information
ORDER
NUMBER
G793D5U
G794D5U
TEMP.
RANGE
PACKAGE
(Green)
MARKING
G793
G794
-55°C to +125°C
-55°C to +125°C
TSSOP-20
TSSOP-20
Note: D5: TSSOP-20
U: Tape & Reel
GMT Inc. does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and GMT Inc. reserves the right at
any time without notice to change said circuitry and specifications.
Pin Configuration
G793
G794
FAN2
1
2
3
4
5
6
FAN3
FG3
NC
FAN2
1
2
20
19
18
17
20 FAN3
FG2
FAN1
FG1
FG3
19
18
17
16
15
14
13
FG2
FAN1
FG1
3
4
5
6
FAN4
NC
FG4
GND
DVCC
SCL
SDA
X2
16 GND
DVCC
ALERT
AVCC
ALERT
15
AVCC
DXP1
DXP1
14 SCL
13 SDA
12 X2
7
8
7
8
SGND1
DXP2
SGND1
9
DXP2
9
12
X1/CLK
11
SGND2
SGND2 10
10
11 X1/CLK
TSSOP-20
TSSOP-20
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 2.0
Oct 18, 2010
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