10-Port SPI-Interfaced I/O Expander with

Overvoltage and Hot-Insertion Protection

6

_______________________________________________________________________________________

COMMAND ADDRESS

REGISTER

D15

D14

D13

D12

D11

D10

D9

D8

CODE

(hex)

Port P0 output level

R/W

0

0

0

00

0

0

0x00

Port P1 output level

R/W

0

0

0

00

0

1

0x01

Port P2 output level

R/W

0

0

0

00

1

0

0x02

Port P3 output level

R/W

0

0

0

00

1

1

0x03

Port P4 output level

R/W

0

0

0

01

0

0

0x04

Port P5 output level

R/W

0

0

0

01

0

1

0x05

Port P6 output level

R/W

0

0

0

01

1

0

0x06

Port P7 output level

R/W

0

0

0

01

1

1

0x07

Port P8 output level

R/W

0

0

0

10

0

0

0x08

Port P9 output level

R/W

0

0

0

10

0

1

0x09

Write ports P0 through P9 with same output level

0

Read port P0 output level

1

0

0

0

10

1

0

0x0A

Write ports P0 through P3 with same output level

0

Read port P0 output level

1

0

0

0

10

1

1

0x0B

Write ports P4 through P7 with same output level

0

Read port P4 output level

1

0

0

0

11

0

0

0x0C

Write ports P8 or P9 with same output level

0

Read port P8 output level

1

0

0

0

11

0

1

0x0D

Read ports P7 through P0 inputs

1

0

0

0

11

1

0

0x0E

Read ports P9 and P8 inputs

1

0

0

0

11

1

1

0x0F

RAM

R/W

0

0

1

00

1

1

0x13

No-op

R/W

0

1

0

00

0

0

0x20

Factory reserved; do not write to this register

R/W

1

1

1

11

0

1

0x7D

Table 1. Register Address Map

REGISTER DATA

REGISTER

POWER-UP CONDITION

ADDRESS

CODE

(hex)

D7

D6

D5

D4

D3

D2

D1

D0

Port P0 output level

Port 0 high impedance

0x00

1

1

11111

1

Port P1 output level

Port 1 high impedance

0x01

1

1

11111

1

Port P2 output level

Port 2 high impedance

0x02

1

1

11111

1

Port P3 output level

Port 3 high impedance

0x03

1

1

11111

1

Port P4 output level

Port 4 high impedance

0x04

1

1

11111

1

Port P5 output level

Port 5 high impedance

0x05

1

1

11111

1

Port P6 output level

Port 6 high impedance

0x06

1

1

11111

1

Port P7 output level

Port 7 high impedance

0x07

1

1

11111

1

Port P8 output level

Port 8 high impedance

0x08

1

1

11111

1

Port P9 output level

Port 9 high impedance

0x09

1

1

11111

1

RAM

0x00

0x13

0

0

00000

0

Table 2. Initial Power-Up Register Status