PI4IOE5V9555LE

I/o Expanders Overview

The PI4IOE5V9555 is a 16-bit I2C-bus and SMBus I/O port expander designed for general-purpose parallel input/output expansion. It operates with a supply voltage ranging from 2.3 V to 5.5 V and supports clock frequencies up to 400 kHz. The device features 16 individually configurable I/O pins, which can be programmed as inputs or outputs. It includes an active LOW interrupt output that signals state changes on input pins. The component provides 5V tolerant I/Os, noise filters on SCL/SDA inputs, and ESD protection rated at 4 kV HBM and 1 kV CDM. It is available in TSSOP-24 and TQFN-24 packages.

I/o Expanders Feature Summary

• Provides 16 bits of general-purpose parallel input/output expansion compatible with I2C-bus and SMBus applications.
• Features an open-drain active LOW interrupt output that activates when any configured input pin changes state.
• Includes polarity inversion registers to modify the logic level interpretation of input port data.
• Offers five-volt tolerant I/Os allowing operation across a wide power supply range while maintaining compatibility with 5V systems.

I/o Expanders Applications

• ACPI power switch control
• Sensor interface connections
• Push button scanning
• LED driver expansion

I/o Expanders Procurement Notes

Verify the specific package variant required for the design, either TSSOP-24 or TQFN-24, as these are distinct physical components within the same functional family. Confirm RoHS compliance status through official manufacturer documentation prior to finalizing procurement specifications. Ensure the ordering suffix matches the desired tape and reel configuration if automated assembly is planned. Cross-reference the datasheet revision number to guarantee alignment with current manufacturing standards.

I/o Expanders Selection Notes

Select this component when a system requires additional GPIO lines accessible via standard I2C or SMBus protocols. It is suitable for designs needing 5V tolerance on input and output pins without external level shifting circuitry. Consider the interrupt capability for efficient event-driven monitoring of peripheral states. Evaluate the operating temperature range of -40°C to +85°C against environmental requirements. Verify that the maximum clock frequency of 400 kHz meets the bus speed requirements of the host controller.

I/o Expanders Part Context

This device belongs to the PI4IOE series of I/O expanders manufactured by Diodes Incorporated. It serves as a solution for expanding microcontroller I/O capabilities in space-constrained applications. The series utilizes a standardized register map for input ports, output ports, configuration, and polarity inversion. It allows up to eight devices to share a single I2C bus using three address selection pins.

I/o Expanders Replacement Considerations

The PI4IOE5V9555ZDEX is a direct package alternative offering the same functionality in a TQFN-24 form factor compared to the TSSOP-24 version. Verify pinout compatibility and thermal characteristics when switching between the L (TSSOP) and ZD (TQFN) package codes.

I/o Expanders FAQ

How many devices can share the same I2C bus?

Up to eight PI4IOE5V9555 devices can share the same I2C bus/SMBus by utilizing the three hardware address input pins (A0, A1, A2) to select from eight preset addresses.

What happens to the I/O pins after a power-on reset?

Upon power-on reset, all I/O pins are configured as inputs with high-impedance output drivers and weak pull-ups to VCC. All internal registers return to their default values.

Can an I/O pin configured as an output trigger the interrupt?

No, only pins configured as inputs can cause an interrupt. The interrupt output activates when the state of a configured input pin changes.