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PCAL6408APW Datasheet(PDF) 8 Page - NXP Semiconductors

Part # PCAL6408APW
Description  Low-voltage translating, 8-bit I2C-bus/SMBus I/O expander with interrupt output, reset, and configuration registers
PDF  49 Pages
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCAL6408APW Datasheet(HTML) 8 Page - NXP Semiconductors

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PCAL6408A
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2013. All rights reserved.
Product data sheet
Rev. 3 — 18 September 2013
8 of 49
NXP Semiconductors
PCAL6408A
Low-voltage translating, 8-bit I2C-bus/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 PCAL6408A. 2 bits of this
data byte state the operation (read or write) and the internal registers (Input, Output,
Polarity Inversion, or Configuration) that are affected. Bit 6 in conjunction with the lower
3 bits of the Command byte are used to point to the extended features of the device
(Agile I/O). 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 8.
Pointer register bits
002aaf540
B7
B6
B5
B4
B3
B2
B1
B0
Table 6.
Command byte
Pointer register bits
Command byte 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
0
1
0
0
0
0
0
0
40h
Output drive strength 0
read/write byte
1111 1111
0
1
0
0
0
0
0
1
41h
Output drive strength 1
read/write byte
1111 1111
0
1
0
0
0
0
1
0
42h
Input latch
read/write byte
0000 0000
0
1
0
0
0
0
1
1
43h
Pull-up/pull-down enable
read/write byte
0000 0000
0
1
0
0
0
1
0
0
44h
Pull-up/pull-down selection read/write byte
1111 1111
0
1
0
0
0
1
0
1
45h
Interrupt mask
read/write byte
1111 1111
0
1
0
0
0
1
1
0
46h
Interrupt status
read byte
0000 0000
0
1
0
0
1
1
1
1
4Fh
Output port configuration
read/write byte
0000 0000



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