TCA6424 Datasheet, PDF (8/29 Pages) Texas Instruments – LOW-VOLTAGE 24-BIT I2C AND SMBus I/O EXPANDER WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS

TCA6424
LOW-VOLTAGE 24-BIT I²C AND SMBus I/O EXPANDER
WITH INTERRUPT OUTPUT, RESET, AND CONFIGURATION REGISTERS
SCPS175 – NOVEMBER 2007
CONTROL REGISTER BITS
AI B6 B5 B4 B3 B2 B1
000 0 0 0
0
100 0 0 0
0
000 0 0 0
0
100 0 0 0
0
000 0 0 0
1
100 0 0 0
1
000 0 0 0
1
100 0 0 0
1
000 0 0 1
0
100 0 0 1
0
000 0 0 1
0
100 0 0 1
0
000 0 0 1
1
100 0 0 1
1
000 0 0 1
1
100 0 0 1
1
000 0 1 0
0
100 0 1 0
0
000 0 1 0
0
100 0 1 0
0
000 0 1 0
1
100 0 1 0
1
000 0 1 0
1
100 0 1 0
1
000 0 1 1
0
100 0 1 1
0
000 0 1 1
0
100 0 1 1
0
000 0 1 1
1
100 0 1 1
1
000 0 1 1
1
100 0 1 1
1
(1) Undefined
Command Byte
AUTO-
INCREMENT
B0
STATE
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
0
Disable
0
Enable
1
Disable
1
Enable
COMMAND
BYTE
(HEX)
00
80
01
81
02
82
03
83
04
84
05
85
06
86
07
87
08
88
09
89
0A
8A
0B
8B
0C
8C
0D
8D
0E
8E
0F
8F
REGISTER
Input Port 0
Input Port 1
Input Port 2
Reserved
Output Port 0
Output Port 1
Output Port 2
Reserved
Polarity Inversion
Port 0
Polarity Inversion
Port 1
Polarity Inversion
Port 2
Reserved
Configuration Port 0
Configuration Port 1
Configuration Port 2
Reserved
PROTOCOL
Read byte
Read byte
Read byte
Reserved
Read/write
byte
Read/write
byte
Read/write
byte
Reserved
Read/write
byte
Read/write
byte
Read/write
byte
Reserved
Read/write
byte
Read/write
byte
Read/write
byte
Reserved
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POWER-UP
DEFAULT
xxxx xxxx⁽¹⁾
xxxx xxxx⁽¹⁾
xxxx xxxx⁽¹⁾
Reserved
1111 1111
1111 1111
1111 1111
Reserved
0000 0000
0000 0000
0000 0000
Reserved
1111 1111
1111 1111
1111 1111
Reserved
8
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