TCA6424_10 datasheet(8/29 Pages) TI

No. de pieza	TCA6424

Descripción Electrónicos	LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

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Fabricante Electrónico	TI [Texas Instruments]

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TCA6424

SCPS175A – NOVEMBER 2007 – REVISED NOVEMBER 2009

www.ti.com

Table 5. Command Byte

CONTROL REGISTER BITS

AUTO-

COMMAND

POWER-UP

INCREMENT

BYTE

REGISTER

PROTOCOL

DEFAULT

AI

B6

B5

B4

B3

B2

B1

B0

STATE

(HEX)

0

Disable

00

Input Port 0

Read byte

xxxx xxxx(1)

1

0

Enable

80

0

1

Disable

01

Input Port 1

Read byte

xxxx xxxx(1)

1

0

1

Enable

81

0

1

0

Disable

02

Input Port 2

Read byte

xxxx xxxx(1)

1

0

1

0

Enable

82

0

1

Disable

03

Reserved

1

0

1

Enable

83

0

1

0

Disable

04

Read/write

Output Port 0

1111 1111

byte

1

0

1

0

Enable

84

0

1

0

1

Disable

05

Read/write

Output Port 1

1111 1111

byte

1

0

1

0

1

Enable

85

0

1

0

Disable

06

Read/write

Output Port 2

1111 1111

byte

1

0

1

0

Enable

86

0

1

Disable

07

Reserved

1

0

1

Enable

87

0

1

0

Disable

08

Polarity Inversion

Read/write

0000 0000

Port 0

byte

1

0

1

0

Enable

88

0

1

0

1

Disable

09

Polarity Inversion

Read/write

0000 0000

Port 1

byte

1

0

1

0

1

Enable

89

0

1

0

1

0

Disable

0A

Polarity Inversion

Read/write

0000 0000

Port 2

byte

1

0

1

0

1

0

Enable

8A

0

1

0

1

Disable

0B

Reserved

1

0

1

0

1

Enable

8B

0

1

0

Disable

0C

Read/write

Configuration Port 0

1111 1111

byte

1

0

1

0

Enable

8C

0

1

0

1

Disable

0D

Read/write

Configuration Port 1

1111 1111

byte

1

0

1

0

1

Enable

8D

0

1

0

Disable

0E

Read/write

Configuration Port 2

1111 1111

byte

1

0

1

0

Enable

8E

0

1

Disable

0F

Reserved

1

0

1

Enable

8F

(1)

Undefined

8

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