PCA8575 查看數據表（PDF） - Philips Electronics

零件编号

产品描述 (功能)

生产厂家

PCA8575

Remote 16-bit I/O expander for I2C-bus with interrupt

Philips Electronics 

NXP Semiconductors

PCA8575

Remote 16-bit I/O expander for I2C-bus with interrupt

SCL 1 2 3 4 5 6 7 8 9

slave address

data to port 0

data to port 1

SDA S A6 A5 A4 A3 A2 A1 A0 0

A

PP

07 06

1

PPPPP

04 03 02 01 00

A

P

17

1

PPPPPP

15 14 13 12 11 10

A

START condition

write to port

data output from port

R/W

P05

acknowledge

from slave

P16

acknowledge

from slave

acknowledge

from slave

tv(Q)

data A0 and B0 valid

tv(Q)

data A0 and B0 valid

P05 output voltage

P05 pull-up output current

P16 output voltage

Itrt(pu)

IOH

P16 pull-up output current

INT

Fig 11. Write mode (output)

td(rst)

Itrt(pu)

IOH

002aab632

8.3 Reading from a port (Input mode)

All ports programmed as input should be set to logic 1. To read, the master

(microcontroller) first addresses the slave device after it receives the interrupt. By setting

the last bit of the byte containing the slave address to logic 1 the Read mode is entered.

The data bytes that follow on the SDA are the values on the ports.

If the data on the input port changes faster than the master can read, this data may be

lost.

PCA8575_1

Objective data sheet

Rev. 01 — 30 November 2006

© NXP B.V. 2006. All rights reserved.

8 of 30

Share Link: