PCA6416A NXP [NXP Semiconductors], PCA6416A Datasheet - Page 7

• Manufacturer Part Number: PCA6416A
• Description: Low-voltage translating 16-bit I2C-bus/SMBus I/O expander
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
Table 6.
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PCA6416A
Product data sheet
B7
0
0
0
0
0
0
0
0
Undefined.
B6
0
0
0
0
0
0
0
0
Command byte
Pointer register bits
B5
0
0
0
0
0
0
0
0
7.2 Interface definition
7.3 Pointer register and command byte
B4
0
0
0
0
0
0
0
0
B3
Table 5.
Following the successful acknowledgement of the address byte, the bus master sends a
command byte, which is stored in the Pointer register in the PCA6416A. The lower three
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.
Once a new command has been sent, the register that was last addressed continues to
be accessed by reads until a new command byte is sent.
0
0
0
0
0
0
0
0
Byte
I
I/O data bus
2
Fig 7.
C-bus slave address
B2
0
0
0
0
1
1
1
1
Pointer register bits
B1
0
0
1
1
0
0
1
1
Interface definition
B0
All information provided in this document is subject to legal disclaimers.
0
1
0
1
0
1
0
1
Rev. 1 — 11 September 2012
Command
7 (MSB)
byte
00h
01h
02h
03h
04h
05h
06h
07h
P0.7
P1.7
Low-voltage translating 16-bit I
L
B7
B6
P0.6
P1.6
Register
Input port 0
Input port 1
Output port 0
Output port 1
Polarity Inversion port 0
Polarity Inversion port 1
Configuration port 0
Configuration port 1
H
6
B5
B4
P0.5
P1.5
5
L
B3
B2
P0.4
P1.4
4
L
B1
002aaf540
Bit
B0
P0.3
P1.3
3
L
Protocol
read/write byte
read/write byte
read/write byte
read/write byte
read byte
read byte
read/write byte
read/write byte
2
C-bus/SMBus I/O expander
P0.2
P1.2
PCA6416A
2
L
© NXP B.V. 2012. All rights reserved.
ADDR
P0.1
P1.1
1
Power-up
default
xxxx xxxx
xxxx xxxx
1111 1111
1111 1111
0000 0000
0000 0000
1111 1111
1111 1111
0 (LSB)
P0.0
P1.0
R/W
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