PCA9570 datasheet(10/32 Pages) NXP

Part #	PCA9570

Description	Remote 4-bit general purpose outputs for 1 MHz I2C-bus

PDF	32 Pages

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Manufacturer	NXP [NXP Semiconductors]

Direct Link	http://www.nxp.com

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PCA9570

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Product data sheet

Rev. 4 — 17 September 2014

10 of 32

NXP Semiconductors

PCA9570

Remote 4-bit general purpose outputs for 1 MHz I2C-bus

Application design-in information

9.1 I/O expander applications

Figure 14 shows a 4-bit output expander application. The desired HIGH or LOW logic

levels are controlled by the master with speeds of up to 1 MHz on a lightly loaded bus

(<100 pF). This allows the host processor to control various functions quickly and with

very low overhead. The port read function of the device enables the host processor to poll

the status of the output port pins. This is useful for system recovery operations or

debugging.

Fig 14. I/O expander application

002aah232

latch control

switch control

1.8 V

SDA

SCL

CORE

PROCESSOR

1.8 V

GPS enable

vibrator control

PCA9570 Datasheet(PDF) 10 Page - NXP Semiconductors