PCA9555 查看數據表（PDF） - NXP Semiconductors.

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PCA9555

16-bit I2C-bus and SMBus I/O port with interrupt

NXP Semiconductors. 

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

slave address

0 1 0 0 A2 A1 A0 R/W

fixed

programmable

002aac219

Fig 8. PCA9555 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.

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

PCA9555_8

Product data sheet

Rev. 08 — 22 October 2009

© NXP B.V. 2009. All rights reserved.

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