PI4IOE5V9537UEX

I/o Expanders Overview

The PI4IOE5V9537UEX is a 4-bit I2C-bus and SMBus low power I/O port with interrupt and reset, manufactured by Diodes Incorporated. It operates on a supply voltage from 2.3V to 5.5V and features 5V tolerant I/Os. The device includes an active low interrupt output and an active low reset input. It supports clock frequencies from 0Hz to 1MHz and incorporates noise filters on SCL/SDA inputs. The component provides ESD protection rated at 4kV HBM and 1kV CDM. It is housed in an MSOP-10 package.

I/o Expanders Feature Summary

• Provides 4 bits of General Purpose parallel Input/Output (GPIO) expansion for I2C-bus/SMBus applications
• Features an open-drain interrupt output activated when any input state changes
• Includes a polarity inversion register to change the polarity of the input port register data
• Supports power-on reset and manual reset via an active low pin without de-powering the device

I/o Expanders Applications

• ACPI power switches
• Sensors
• Push buttons
• LEDs
• Fans

I/o Expanders Procurement Notes

Verify the datasheet revision date and electrical specifications against the official Diodes Incorporated documentation before integration. Confirm that the MSOP-10 package dimensions align with the PCB footprint requirements. Ensure the operating voltage range of 2.3V to 5.5V matches the system power rails. Validate the I2C address configuration and interrupt handling logic within the host controller firmware.

I/o Expanders Selection Notes

Select this component when a compact solution for expanding GPIO pins via I2C or SMBus is required. It is suitable for systems needing 5V tolerance on I/O lines while operating at lower voltages. Consider the low current consumption characteristics for battery-powered designs. Verify that the interrupt functionality meets the system's real-time response requirements for input state changes.

I/o Expanders Part Context

The PI4IOE5V9537UEX belongs to the PI4IOE5V9537 series of I/O expanders produced by Diodes Incorporated. It is the tape and reel version of the standard PI4IOE5V9537 device. The series is designed to provide simple I/O expansion with minimal external components. It shares functional similarities with other devices in the PIO4IO family but offers specific packaging and interface configurations.

I/o Expanders Replacement Considerations

Check for direct substitutes within the PI4IOE5V9537 series that may offer different packaging options, such as the tube version. Verify compatibility with existing I2C addresses and register maps if replacing with other I/O expanders. Ensure that any alternative component maintains the same 5V tolerance and interrupt capabilities.

I/o Expanders FAQ

How does the power-on reset function initialize the device?

When power is applied to VCC, an internal power-on reset holds the device in a reset condition until VCC reaches the power-on reset voltage. At that point, the registers and SMBus state machine initialize to their default states.

What is the purpose of the polarity inversion register?

The polarity inversion register allows the user to invert the polarity of the Input port register data. Setting a bit inverts the corresponding input data, while clearing it retains the original polarity.

How is the interrupt output triggered?

The open-drain interrupt output is activated when one of the port pins changes state, provided the pin is configured as an input. It is deactivated when the input returns to its previous state or the Input Port register is read.