Diodes Incorporated PI4IOE5V6416AZDEX

Overview

PI4IOE5V6416AZDEX from Diodes Incorporated is a 16-bit I²C-bus I/O expander with bidirectional voltage-level translation, supporting independent 1.65 V–5.5 V operation on both GPIO port (V_DD(P)) and I²C bus (V_{DD(I2C_bus)}) sides. It features programmable push-pull/open-drain outputs, active-low open-drain interrupt (INT), and active-low reset (RESET). Used in battery-powered mobile systems to interface sensors, keypads, and push buttons while minimizing interconnects.

For engineers reviewing the PI4IOE5V6416AZDEX datasheet, PI4IOE5V6416AZDEX pinout, PI4IOE5V6416AZDEX application, or PI4IOE5V6416AZDEX equivalent, this device supports I²C Fast Mode (400 kHz), offers per-pin output drive strength control (four levels), enables interrupt masking per GPIO, provides power-on reset, and maintains <1.5 µA standby current at 5 V - critical for low-power embedded and portable designs.

Technical Context

The PI4IOE5V6416AZDEX implements dual-voltage-domain I/O expansion via separate V_DD(P) and V_{DD(I2C_bus)} rails, enabling seamless interfacing between next-gen low-voltage microcontrollers (e.g., 1.8 V I²C masters) and mixed-voltage peripherals (e.g., 3.3 V or 5 V GPIO loads). Its internal architecture includes two 8-bit port registers (P0/P1), configurable polarity inversion, and latched/non-latched input modes controlled by dedicated registers (44h/45h).

Interrupt generation is triggered by GPIO state changes relative to the Input Port register value, with masking enabled per pin via Interrupt Mask Registers (4Ah/4Bh). The device supports full I²C Standard (100 kHz) and Fast Mode (400 kHz) timing, including t_LOW, t_HIGH, and t_SU;DAT compliance across 1.65–5.5 V supply ranges, and integrates internal 50–150 kΩ pull-up/pull-down resistors controllable per pin.

Key Specifications

Pinout & Package

Package: 24-pin TQFN (ZD), 4 mm × 4 mm, 0.5 mm pitch, exposed thermal pad.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TCA6424A and PCA9555, the PI4IOE5V6416AZDEX uniquely delivers independent dual-rail operation, per-GPIO drive tuning, and interrupt masking - making it optimal for power-constrained, mixed-voltage portable and automotive body electronics.

Availability

PI4IOE5V6416AZDEX is available at Aetrix Electronics and suitable for smartphone keypad interfaces, industrial sensor hubs, wearable health monitors, and automotive body control modules requiring stable component supply and long-term production continuity.

Supply support for PI4IOE5V6416AZDEX 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 semiconductor company specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.

The PI4IOE5V6416AZDEX belongs to Diodes' I/O expander product line, designed specifically for low-power, voltage-flexible peripheral expansion in portable, industrial, and automotive systems where minimal interconnect and deterministic reset behavior are essential.

FAQ

What is the function of the ADDR pin on PI4IOE5V6416AZDEX?

The ADDR pin is a hardware address select input that sets the least-significant bit (A0) of the I²C slave address. When tied to V_DD(P), it configures the device to respond to address 0x21; when grounded, it responds to 0x20. This allows two PI4IOE5V6416AZDEX devices to share the same I²C bus without address conflict, enabling scalable I/O expansion in space-constrained designs.

How does the PI4IOE5V6416AZDEX handle power-on initialization?

At power-on, all 16 GPIOs default to high-impedance inputs, and all configuration registers initialize to known states: Output Port registers = 0xFF (all high), Configuration registers = 0xFF (all inputs), and Interrupt Mask registers = 0xFF (all interrupts masked). The internal power-on reset circuit triggers when V_DD(P) rises above 1.4 V (typical), ensuring deterministic startup without external reset circuitry unless system-level synchronization is required.

Can the PI4IOE5V6416AZDEX drive LEDs directly?

Yes - each GPIO supports programmable output drive strength up to 10 mA (at V_DD(P) = 4.5 V) in push-pull mode, sufficient for driving low-current indicator LEDs. The device also provides internal pull-up/pull-down resistors (50–150 kΩ), eliminating external bias components. For higher-current LEDs, external FETs or drivers are recommended, but the integrated drive capability simplifies UI design in portable consumer electronics.

What is the role of V_{DD(I2C_bus)} versus V_DD(P) in level translation?

V_{DD(I2C_bus)} powers the SCL/SDA interface circuitry and defines the logic thresholds for I²C communication, while V_DD(P) powers the GPIO port and sets the output voltage swing and input thresholds for P0/P1 pins. The separation enables true bidirectional level translation: a 1.8 V I²C master can communicate with 3.3 V GPIO peripherals because the device internally buffers and translates signals between the two domains without external components.