TCA6424_10 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
SCPS175A – NOVEMBER 2007 – REVISED NOVEMBER 2009
Table 5. Command Byte
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
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
(1) Undefined
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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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