Diodes Incorporated PI4IOE5V6416AQ2LEX

Overview

PI4IOE5V6416AQ from Diodes Incorporated is a 16-bit I²C-bus I/O expander with bidirectional voltage-level translation (1.65 V to 5.5 V on both I²C and GPIO sides), programmable push-pull/open-drain outputs, active-low interrupt output, and AEC-Q100 Grade 2 qualification - used in automotive body control modules for remote switch sensing and LED driver interface.

For engineers reviewing the PI4IOE5V6416AQ datasheet, PI4IOE5V6416AQ pinout, PI4IOE5V6416AQ application, or PI4IOE5V6416AQ equivalent, this device supports flexible GPIO configuration, per-pin drive strength control (4 levels), interrupt masking, and power-on reset - critical for low-power automotive microcontroller interfaces requiring robust level-shifting and fault reporting.

Technical Context

The PI4IOE5V6416AQ implements a dual-voltage-domain I²C slave architecture with independent V_{DD(I2C_bus)} (1.65–5.5 V) and V_DD(P) (1.65–5.5 V) supplies, enabling seamless interfacing between legacy 5 V microcontrollers and modern 1.8 V sensors. Its internal logic decouples SCL/SDA signaling from GPIO port voltage domains via dedicated level-shifting circuitry.

It features register-mapped I/O control including 16-bit input/output registers, polarity inversion, configuration direction bits, per-port pull-up/pull-down enable and selection (50–150 kΩ), and interrupt status/mask registers - all accessible over standard/fast-mode I²C (up to 400 kHz) with ACK timing compliant to I²C specification.

Key Specifications

Pinout & Package

Package: 24-pin TSSOP (L), RoHS-compliant, lead-free, halogen- and antimony-free "Green" construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar I/O expander applications.

Compared with PCA9555DWR and TCA6424ARGJR, the PI4IOE5V6416AQ uniquely combines AEC-Q100 Grade 2 qualification, per-pin drive strength tuning, and integrated 50–150 kΩ pull resistors - making it the only option qualified for automotive body electronics with minimal external component count.

Availability

PI4IOE5V6416AQ is available at Aetrix Electronics and suitable for automotive body control modules, industrial HMI panels, smart lighting controllers, and battery-powered IoT sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for PI4IOE5V6416AQ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability solutions for automotive, industrial, and consumer markets with ISO/TS 16949-certified manufacturing.

The PI4IOE5V6416AQ belongs to Diodes' automotive-qualified I/O expander product line, designed specifically to replace discrete logic and reduce interconnect complexity in vehicle body electronics and ADAS subsystems.

FAQ

What is the minimum V_{DD(I2C_bus)} required for reliable 400 kHz I²C operation?

The PI4IOE5V6416AQ supports 400 kHz I²C operation down to 1.65 V on V_{DD(I2C_bus)}, verified per DS43598 Rev 2-2 dynamic characteristics table. At this voltage, t_LOW and t_HIGH meet fast-mode timing requirements (min 1.3 μs), and VOL remains ≤0.4 V with 3 mA sink current - ensuring compatibility with 1.8 V masters.

Can the INT pin be connected directly to a 3.3 V microcontroller GPIO without a level shifter?

Yes - the INT pin is open-drain and compatible with any V_DD up to 5.5 V. When pulled up to 3.3 V, it delivers a clean 0 V / 3.3 V logic signal. The datasheet specifies I_OL ≥3 mA at V_OL = 0.4 V, confirming reliable LOW assertion even with 10 kΩ pull-up to 3.3 V.

How does the power-on reset (POR) interact with the RESET pin?

POR is internal and automatic at V_DD(P) rise crossing 1.1–1.4 V; it initializes all I/Os as inputs and resets registers. The RESET pin provides asynchronous external reset - asserting it LOW forces identical initialization regardless of supply voltage, overriding POR timing. Both assert the same internal reset signal.

Is ADDR pin required to be hard-wired, or can it be dynamically controlled?

ADDR must be statically tied to V_DD(P) or GND during power-up to set the I²C slave address (0x20 or 0x21); floating or dynamically driven ADDR causes undefined address behavior. The datasheet explicitly states ADDR is a hardware address package pin - not a runtime-configurable register bit.