PCF8575 查看數據表（PDF） - NXP Semiconductors.

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PCF8575

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

NXP Semiconductors. 

Philips Semiconductors

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

Product specification

PCF8575

1 FEATURES

• Operating supply voltage 2.5 to 5.5 V

• Low standby current consumption of 10 µA maximum

• I2C-bus to parallel port expander

• 400 kbits/s FAST I2C-bus

• Open-drain interrupt output

• 16-bit remote I/O port for the I2C-bus

• Compatible with most microcontrollers

• Latched outputs with high current drive capability for

directly driving LEDs

• Address by 3 hardware address pins for use of up to

8 devices

• SSOP24 package.

2 GENERAL DESCRIPTION

The PCF8575 is a silicon CMOS circuit. It provides general

purpose remote I/O expansion for most microcontroller

families via the two-line bidirectional bus (I2C-bus).

The device consists of a 16-bit quasi-bidirectional port and

an I2C-bus interface. The PCF8575 has a low current

consumption and includes latched outputs with high

current drive capability for directly driving LEDs. It also

possesses an interrupt line (INT) which can be connected

to the interrupt logic of the microcontroller. By sending an

interrupt signal on this line, the remote I/O can inform the

microcontroller if there is incoming data on its ports without

having to communicate via the I2C-bus. This means that

the PCF8575 is an I2C-bus slave transmitter/receiver.

Every data transmission from the PCF8575 must consist

of an even number of bytes, the first byte will be referred

to as P07 to P00 and the second byte as P17 to P10.

The third will be referred to as P07 to P00 and so on.

3 ORDERING INFORMATION

TYPE

NUMBER

PCF8575TS

NAME

SSOP24

PACKAGE

DESCRIPTION

plastic shrink small outline package; 24 leads; body width 5.3 mm

VERSION

SOT340-1

1999 Apr 07

3

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