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PCA9555D-T Datasheet(PDF) 6 Page - NXP Semiconductors

Part # PCA9555D-T
Description  16-bit I2C-bus and SMBus I/O port with interrupt
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Manufacturer  NXP [NXP Semiconductors]
Direct Link  http://www.nxp.com
Logo NXP - NXP Semiconductors

PCA9555D-T Datasheet(HTML) 6 Page - NXP Semiconductors

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PCA9555_8
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 08 — 22 October 2009
6 of 34
NXP Semiconductors
PCA9555
16-bit I2C-bus and SMBus I/O port with interrupt
6.
Functional description
Refer to Figure 1 “Block diagram of PCA9555”.
6.1 Device address
6.2 Registers
6.2.1 Command byte
The command byte is the first byte to follow the address byte during a write transmission.
It is used as a pointer to determine which of the following registers will be written or read.
Fig 8.
PCA9555 device address
R/W
002aac219
0
1
0
0
A2
A1
A0
programmable
slave address
fixed
Table 4.
Command byte
Command
Register
0
Input port 0
1
Input port 1
2
Output port 0
3
Output port 1
4
Polarity Inversion port 0
5
Polarity Inversion port 1
6
Configuration port 0
7
Configuration port 1


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