G771 datasheet(2/15 Pages) GMT

2 / 15 page

Ver 0.2 Preliminary

Dec 11, 2001

TEL: 886-3-5788833

http://www.gmt.com.tw

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

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

2N3904

10k EACH

SMBCLK

SMBDATA

TH_SHUT

SMBCLK

SMBDATA

ALERT

0.1µF

G771

RESET

µP

0.1µF

Vcc

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