PCF8574 IO Expansion Board
PCF8574 IO Expansion Board
PCF8574, I2C interface, 8-bit parallel port
Primary Attribute
Category: Modules
Brand: Waveshare
Website
International: Website
Chinese: 官方网站
Onboard Interfaces
Contents
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- 1 Overview
- 2 Features
- 3 Pinouts
- 4 Beware of knock-offs
- 5 Setup software
- 6 Download examples
- 7 Hardware connection
- 8 Run examples
- 9 Hardware connection
- 10 Examples
- 11 Hardware connection
- 12 Examples
- 13 Resources
- 14 FAQ
- 15 Support
Overview
The PCF8574 IO Expansion Board is used as a remote 8-bit I/O expander for I2C-bus. Up to 8 PCF8574, IO Expansion Board can be connected to the I2C-bus, providing up to 64 I/O ports.
The PCF8574 IO Expansion Board features an I2C pinheader on one side and an I2C connector on the opposite side. Hence, it’s more flexible to connect the board to your development system. The board also supports I2C cascading, allowing the use of multi modules connected to the I2C bus at the same time by connecting the pinheader and connector.
Features
- Chip: PCF8574
- Working voltage: 3.3V/5V
- IO: 8
- Interface: I2C
Pinouts
| Pin | Description |
|---|---|
| VCC | 3.3V/5V |
| GND | Power ground |
| SDA | I2C data input |
| SCL | I2C clock pin |
Hardware connection
| PCF8574 | Raspberry Pi | Description |
|---|---|---|
| Board order | ||
| VCC | 5V | Power input |
| GND | GND | Power ground |
| SDA | 3 | I2C data input |
| SCL | 5 | I2C clock pin |
