Name: GPIO Expander PCAL6416A Breakout
Brand: Soldered Electronics
SKU: 333180
Price: 4.95 EUR
Availability: InStock

GPIO Expander PCAL6416A Breakout

€4,95

GPIO Expander PCAL6416A Breakout

SKU: 333180

€4,95

24/7 lifetime customer and technical support

2-year Warranty -no questions asked

Comprehensive Documentation

Open-source everything

Made in EU

Designed and manufactured in Croatia.

In-stock in EU warehouse

Ships from Croatia, fast EU delivery.

Volume discounts

Educational and OEM pricing on request.

2-year warranty

Standard EU 2-year warranty on all Soldered products.

Complimentary technical support

Our engineers answer your questions free of charge.

Qwiic

Solderless Qwiic connector, chain it to any Qwiic board with a single cable.

Breadboard-compatible

2.54 mm pin spacing, drops straight onto any breadboard.

3.3 V & 5 V tolerant

Built-in level shifting, safe to use with both 3.3 V and 5 V logic levels.

LEGO-compatible

Mounting holes line up with LEGO spacing and peg size.

Description

GPIO Expander PCAL6416A Breakout is built around NXP's PCAL6416A, a 16-bit I2C GPIO expander that adds 16 programmable input/output pins to a microcontroller over two I2C wires. The 16 pins are split into two 8-bit ports, Port A and Port B, and each pin supports an individually configurable 100 kOhm pull-up or pull-down resistor along with input latching. A soldered Arduino library is available for reading and writing the expanded pins.

It's a common choice when a microcontroller runs out of GPIO pins: reading a bank of buttons or switches, driving a set of LEDs or relays directly, or building a keypad matrix, all through the same two I2C wires you may already be using for other Qwiic boards.

The board communicates over I2C in both standard mode (100 kHz) and fast mode (400 kHz), at a default address of 0x20 that can be changed to 0x21 by cutting the JP3. An active-low interrupt output on the INT pin notifies the host microcontroller whenever an input changes state, removing the need to poll every pin individually. It includes a Qwiic connector for solderless wiring alongside the standard pin headers.

Each output pin can sink up to 25 mA, enough to drive an LED directly. Onboard jumpers select between 5V and 3.3V I2C pull-ups and can bypass the onboard voltage regulator when needed. The board measures 22 x 38 mm, with two mounting holes sized for M3 screws.

Technical Specifications

IC: NXP PCAL6416A
GPIO pins: 16 (two 8-bit ports, A0-A7 and B0-B7)
Communication: I2C, standard mode 100 kHz and fast mode 400 kHz
I2C address: 0x20 (default), 0x21 by cutting the JP3 jumper and bridging it to VDD
Interrupt output: Active-low, on INT pin
Output drive: Up to 25 mA per pin
Operating voltage: 5V supply, onboard regulator for 3.3V rail, jumper-selectable I2C pull-up voltage
Software: Arduino library available
Connector: Qwiic
Mounting holes: 2x M3 (3.2 mm diameter)
Dimensions: 22 x 38 mm / 0.9 x 1.5 inch

Resources & Documentation

DEVELOPMENT & RESOURCES

ARDUINO LIBRARY ARDUINO LIBRARY DOCUMENTATION

DOCUMENTATION & TUTORIALS

FULL PRODUCT DOCUMENTATION GETTING STARTED WITH ARDUINO HARDWARE DETAILS MAIN IC DATASHEET

Reviews

5 stars: 2 (100%)
4 stars: 0 (0%)
3 stars: 0 (0%)
2 stars: 0 (0%)
1 star: 0 (0%)

Der GPIO Expander PCAL6416A hat mein Projekt gerettet! Mir sind am Mikrocontroller die Pins ausgegangen, aber dank dieses Boards konnte ich problemlos 16 zusätzliche I/O-Pins über I2C hinzufügen. Die Einbindung über den Qwiic-Anschluss ging super schnell und die Arduino-Bibliothek funktioniert einwandfrei. Besonders gut gefällt mir der INT-Pin für Interrupts – so spart man sich das ständige Polling. Auch die konfigurierbaren Pull-Up/Pull-Down-Widerstände je Pin und die LED-Ansteuerung mit bis zu 25 mA sind extrem praktisch. Kompakt, durchdacht und absolut zuverlässig!