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G771 Datasheet(PDF) 2 Page - Global Mixed-mode Technology Inc

Part No. G771
Description  Two Remote Temperature Sensors with SMBus Serial Interface and System Reset Circuit
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Maker  GMT [Global Mixed-mode Technology Inc]
Homepage  http://www.gmt.com.tw
Logo 

 
 2 page
background image
Ver 0.2 Preliminary
Dec 11, 2001
TEL: 886-3-5788833
http://www.gmt.com.tw
2
G771
Global Mixed-mode Technology Inc.
The G771 also contains a microprocessor (µP) super-
visory circuit used to monitor the power supplies in µP
and digital systems. They provide excellent circuit re-
liability 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 G771
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.
When the temperature of DX1 reaches or exceeds
the Tcrit1 (SMBus 35h) threshold consecutively for
the times equal to the number of faults of the
FQ_TH_SHUT registers, TH_SHUT pin becomes
logic high. The same mechanism is duplicated for
DX2. Therefore, either one of DX1, DX2 continu-
ously over their respective Tcrit, the TH_SHUT will
assert logic high to indicate a thermal shutdown
event.
The G771’s SMBus device address is fixed to be 7Ah
for write and 7Bh for read.
The G771 is available in a small, 16-pin SSOP sur-
face-mount package.
Typical Operating Circuit
INTERRUPT TO µC
Vcc
DXP1
DXN
DXP2
RESET
GND
2200pF
2200pF
2N3904
2N3904
10k EACH
SMBCLK
SMBDATA
TH_SHUT
SMBCLK
SMBDATA
ALERT
0.1µF
G771
RESET
µP
0.1µF
Vcc
INTERRUPT TO µC
Vcc
DXP1
DXN
DXP2
RESET
GND
2200pF
2200pF
2N3904
2N3904
10k EACH
SMBCLK
SMBDATA
TH_SHUT
SMBCLK
SMBDATA
ALERT
0.1µF
G771
RESET
µP
0.1µF
Vcc




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