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The SS8017 also contains a microprocessor (µP)su-

pervisory circuit used to monitor the power supplies in

µP and digital systems. This provides 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

has risen above the reset threshold. The SS8017 has

an active-low RESET output. The reset comparator is

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

number of 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, if either DX1 or DX2 continuously exceeds

their respective Tcrit, the TH_SHUT will assert logic

high to indicate a thermal shutdown event.

The SS8017’s SMBus device address is fixed to be

7Ah for write and 7Bh for read.

The SS8017 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

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

SS8017

RESET

µP

0.1µF

Vcc

SS8017

Rev.2.01 6/06/2003