Product parameters

Supply voltage: 3.3V/5V

Communication interface: 12C interface, 8-bit parallel port

Interface type: pin or socket

Interrupt output: connected to MCU interrupt pin, low level is valid

Product Description

FCF8574 is an I0 port expansion module that uses the I2C protocol. It has three address pins and can allocate up to 8 addresses simultaneously. The board includes 8-bit bidirectional I0 ports (P0-P7), each of which can be separately assigned as an input or output without the need for data direction control signals. When powered on, all I0 levels default to high level.

I2C Address Setting Instructions

The default I2C address of the module is 0x20

The I2C address can be set to 8 different addresses through A0-A2, as shown in the figure

All jumpers are set on the "-" side, meaning LOW is a low level

The "+" side is HIGH, which is a high level

The range of addresses from 0x20 to 0x27 is shown in the table below, which means that one development board can simultaneously connect 8 PCF8574 modules

Simple usage example:

SCL, SDA, VCC, and GND are respectively connected to the corresponding interfaces of the 51 microcontroller

The default setting for jumper caps is "-"

P0-P7, the I/0 pin can be externally connected to an L-print lamp and the flow lamp program can be burned

You can view the silk screen name on the chip and burn the corresponding program

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