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G768B Datasheet(PDF) 2 Page - List of Unclassifed Manufacturers

Part No. G768B
Description  Remote/Local Temperature Sensor, 2 Fan Controllers with SMBus Serial Interface and System Reset Circuit
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Maker  ETC [List of Unclassifed Manufacturers]
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G768B Datasheet(HTML) 2 Page - List of Unclassifed Manufacturers

 
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Ver 1.3
Oct 28, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G768B
Global Mixed-mode Technology Inc.
It uses pulse width modulation (PWM) method and an
on-chip MOSFET to control the fan speed to ±2% of
the programmed speed.
The desired fan speed is also programmed via
SMBus
TM. The actual fan speed and fan status can be
read via the SMBus
TM. Short-circuit protection is im-
plemented to prevent damages to the fan and this IC
itself. The G768B also turns on the fans by hardware
watchdog system. The fan controller would fully turn
on both fans when one of the following conditions
happens.
1.when either of the remote temperature is higher than
its own TMAX.
2.when either of these two remote diodes is open.
3.when both remote diodes are short
The G768B also contains a microprocessor (µP) su-
pervisory circuit used to monitor the power supplies in
µP and digital systems. They provide excellent circuit
reliability and low cost by eliminating external compo-
nents and adjustments when used with 5V-powered
circuits. This circuit asserts a reset signal whenever
the VCC supply voltage declines below a preset
threshold, keeping it asserted for at least 140ms after
VCC has risen above the reset threshold. The G768B
has an active-low RESET output. The reset com-
parator is designed to ignore fast transients on VCC.
Reset threshold of this circuit is set to 4.38V.
The G768B is available in a small, 16-pin SSOP sur-
face-mount package.
Typical Operating Circuit
INTERRUPT TO µC
10µF
OUT1
FG1
V
CC
DXP1
DXN
DXP2
RESET
GND
2200pF
2200pF
2N3904
2N3904
V
CC
10k EACH
SMBCLK
SMBDATA
CLOCK 32.768kHz
IN
FAN1
FG
10µF
OUT2
FG2
SMBCLK
SMBDATA
ALERT
CLK
10µF
G768B
RESET
µP
IN
FAN2
FG
10µF
INTERRUPT TO µC
10µF
OUT1
FG1
V
CC
DXP1
DXN
DXP2
RESET
GND
2200pF
2200pF
2N3904
2N3904
V
CC
10k EACH
SMBCLK
SMBDATA
CLOCK 32.768kHz
IN
FAN1
FG
10µF
OUT2
FG2
SMBCLK
SMBDATA
ALERT
CLK
10µF
G768B
RESET
µP
IN
FAN2
FG
10µF


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