Octal SMBus-to-Parallel I/O Expanders

6

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Figure 1. Functional Diagram

SMBSUS

ALERT

RESPONSE

REGISTER

SMB

IO1

IO2

IO7

THERMAL

SHUTDOWN

8

8

8

8

8

8

1

1

1

7

8

ALERT

FAULT

LATCH

TRANSITION

DETECTORS

S

R

ADD0

ADD1

SMBDATA

SMBCLK

NORMAL RISING

INTERRUPT

MASK REGISTER

NORMAL FALLING

INTERRUPT

MASK REGISTER

NORMAL

OUTPUT

REGISTER

COMMAND

DECODER

INPUT

REGISTER

ADDRESS

DECODER

SUSPEND

OUTPUT

REGISTER

SUSPEND FALLING

INTERRUPT

MASK REGISTER

SUSPEND RISING

INTERRUPT

MASK REGISTER