Product description: PCF8574N - microcontroller IO expander board
The system allows to increase the number of IOs (up to 8) of a microcontroller (e.g. Arduino module). Communicates with the central unit via the I2C bus (TWI).
System has a different address bus, depending on version:
Details in documentation - section 7.1
Details in the documentation section 8.3.3
IOs A2 | A1 | A0 can't stay unconnected.
Technical characteristics of expander IOs
- Power supply: from 2.5 V to 6 V
- Quiescent current: 100 µa (10 µa in low power mode)
- Communication: I2C (TWI)
- Number of contacts: 8
- Case: DIP-16
Details in the documentation.
Episode 10 of the Arduino course on connecting the PCF8574 expander.