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PCA6408APW Datasheet(PDF) 7 Page - NXP Semiconductors

Part # PCA6408APW
Description  Low-voltage, 8-bit I2C-bus and SMBus I/O expander with interrupt output, reset, and configuration registers
PDF  40 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA6408APW Datasheet(HTML) 7 Page - NXP Semiconductors

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PCA6408A
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© NXP B.V. 2012. All rights reserved.
Product data sheet
Rev. 1 — 27 September 2012
7 of 40
NXP Semiconductors
PCA6408A
Low-voltage, 8-bit I2C-bus and SMBus I/O expander
7.2 Interface definition
7.3 Pointer register and command byte
Following the successful acknowledgement of the address byte, the bus master sends a
command byte, which is stored in the Pointer register in the PCA6408A. Two bits of this
data byte state the operation (read or write) and the internal registers (Input, Output,
Polarity Inversion, or Configuration) that will be affected. This register is write only.
[1]
Undefined.
Table 5.
Interface definition
Byte
Bit
7 (MSB)
6
5
4
3
2
1
0 (LSB)
I2C-bus slave address
L
H
L
L
L
L
ADDR
R/W
I/O data bus
P7
P6
P5
P4
P3
P2
P1
P0
Fig 6.
Pointer register bits
002aaf540
B7
B6
B5
B4
B3
B2
B1
B0
Table 6.
Command byte
Pointer register bits
Command byte
(hexadecimal)
Register
Protocol
Power-up
default
B7
B6
B5
B4
B3
B2
B1
B0
0
0
0
0
0
0
0
0
00h
Input port
read byte
xxxx xxxx[1]
0
0
0
0
0
0
0
1
01h
Output port
read/write byte
1111 1111
0
0
0
0
0
0
1
0
02h
Polarity Inversion
read/write byte
0000 0000
0
0
0
0
0
0
1
1
03h
Configuration
read/write byte
1111 1111



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