Diodes Incorporated
W QFN5050 32

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24-bit I2C General Purpose IO Expander with Interrupt & Reset

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The PI4IOE5V6524 is a 24-bit general-purpose I/O expander that provides remote I/O expansion for most microcontroller families via the I2C-bus interface.

It provides a simple solution when additional I/Os are needed while keeping interconnections to a minimum, for example, in battery-powered mobile applications for interfacing to sensors, push buttons, keypad, etc.

It can operate from 1.65V to 5.5V on the GPIO-port side and 0.8V to 3.6V on the SDA/SCL side. This allows the PI4IOE5V6524 to interface with next generation microprocessors and microcontrollers on the SDA/SCL side, where supply levels are dropping down to conserve power.

The bidirectional voltage-level translation in the PI4IOE5V6524 is provided through VDD (12C_bus). VDD (I2C_bus) should be connected to the VDD of the external SCL/SDA lines. The voltage level on the GPIO-port of the PI4IOE5V6524 is determined by VDD (P).

At power on, the I/Os are configured as inputs; however, the system master can enable the I/Os as either inputs or outputs by writing to the I/O direction bits. The data for each input or output is kept in the corresponding Input or Output register. All registers can be read by the system master.

PI4IOE5V6524 has open-drain interrupt (INT) output pin that goes LOW when the input state of a GPIO-port changes from the input-state default register value. The device also has an interrupt masking feature by which the user can mask the interrupt from an individual GPIO-port.


  • Operating power supply voltage range of 0.8V to 3.6V on the I2C- bus side
  • Allows bidirectional voltage-level translation and GPIO expansion between:
    • 8V to 3.6V SCL/SDA and 1.8/2.5/3.3/5.5V Port
  • Low standby current consumption:
    • 2μA typical at 3.3V VDD(P)
  • 5V tolerant I/O ports and 3.6V tolerant I2C-bus pins
  • 1MHz Fast-mode Plus I2C-bus interface
  • Compliant with the I2C-bus Fast-mode plus, Fast-mode and Standard mode
  • I/O Features
    • Output port configuration: bank selectable or pin selectable push-pull or open-drain output stages
    • Interrupt status: read-only register identifies the source of an interrupt
    • I/O programming features:
      • Output drive strength: four programmable drive strengths to reduce rise and fall times in low-capacitance applications Input latch: Input Port register values changes are kept until the Input Port register is read
      • Pull-up/pull-down enable: floating input or pull-up/pull- down resistor enable
      • Pull-up/pull-down selection: 100 kohm pull-up/pull-down resistor selection
      • Interrupt mask: mask prevents the generation of the interrupt when input changes state to prevent spurious interrupts
      • Interrupt edge specification on a bit-by-bit basis
      • Interrupt individual clear without disturbing other events
      • Read all interrupt events without clear
      • Switch debounce hardware
      • General call software reset
      • I2C software Device ID function
  • Power-on reset
  • Active LOW open-drain interrupt output (INT)
  • Active LOW reset input (RESET)
  • Latch-up tested (exceeds 100mA)
  • Latched Outputs for Directly Driving LEDs
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/
  • Packaging (Pb-free & Green):
    • 32-Pin TQFN 5x5mm

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) Standard
Analog or Digital? Digital
Voltage 0.8V  to  5.5V
Single Ended Channels 24
Signal Type Single Ended
Configuration 24 bits
Ambient or Junction Temperature (°C) -40 to 85

Technical Documents

Recommended Soldering Techniques


Additional Technical Documents are available upon request:
Application information, Evaluation board, and Other technical documents

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