Tutorial: TCA9534 / PCF8574P

Adapts or transmits signals between devices.

TCA9534 / PCF8574P

Tutorial / documentation

Communication

Quick documentation & first test preparation

  1. Identify component TCA9534 and its package.
  2. Identify the protocol, logic levels and each pin’s function.
  3. Check required termination and pull-up/pull-down resistors.
  4. Consult the application circuit in the linked documentation before testing.

TCA9534

8-bit I/O Expander, I2C / SMBus interface, interrupt output, fixed address bits 0b0100xxx, TSSOP-16 / SOIC-16

  • 8-bit I/O Expander, I2C / SMBus interface, interrupt output, fixed address bits 0b0100xxx, TSSOP-16 / SOIC-16
  • Identify the protocol, logic levels and each pin’s function.
  • Check required termination and pull-up/pull-down resistors.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

PCF8574P

8-bit I/O Expander, I2C interface, interrupt output, fixed address bits 0b0100xxx, DIP-16

  • 8-bit I/O Expander, I2C interface, interrupt output, fixed address bits 0b0100xxx, DIP-16
  • Identify the protocol, logic levels and each pin’s function.
  • Check required termination and pull-up/pull-down resistors.
  • The manufacturer’s pinout and absolute limits take precedence over this page.
Technical documentation

Inputs and outputs must match the function described in the selected reference’s documentation.