PicoIO64 – 64 IO for Pico

IO for days! This Pico add-on from 8086 gives your Raspberry Pi Pico 64 additional 3.3V, 5V-tolerant IOs for your project. Mucho pins!

The PicoIO64 adds 64 3.3V I/O pins (5V tolerant) to the Raspberry Pi Pico using four 16-bit XRA1403 SPI I/O Expanders coupled with an 800mA 3.3V regulator. The I/O can be used for front panel LED, buttons interfaces and more – whatever your (big!) project needs.

The I/O is arranged in two banks each with two 16-bit SPI expanders A/B and C/D, each bank has its own SPI connection, IRQ, RESET and individual IC chip selects (CS_A/CS_B and CS_C/CS_D). Splitting the banks like this allows each bank’s SPI interface to be controlled using a dedicated core of the RP2040/RP2350 at up to 26Mhz.

The XRA1403 I/O expanders are fully featured, each of the I/O pins can be configured as push-pull output (optional three-state mode), input (optional polarity inversion, optional ~100k pull-up resistor) and a multitude of interrupt options (rising/falling edge, filters, etc.).

The I/O expanders can source/sink a maximum of 25mA per pin, up to 100mA per bank of 8 pins (0-7, 8-15) and overall the IC can source 160mA over all 16 pins.

Note: we stock the pre-soldered version of the PicoIO64.

Pinout

The GPIO connections are documented on the underside of the PCB are shown in the table below.

Features

• 64 additional I/O pins (3.3V, 5V tolerant) for Raspberry Pi Pico
• Four XRA1403 SPI I/O expanders (16-bit) coupled with 800mA 3.3V regulator
• CircuitPython library available
• Two I/O banks (A/B and C/D)
• Configurable I/O pins
• Multiple interrupt options
• Current limits:
  • 25mA per pin
  • 100mA per bank of 8-pins (0-7, 8-15)
  • 160mA per 16-pin expander
• Pre-soldered

Resources

• Documentation
• CircuitPython XRA1403 library
• XRA1403 product page

Package Contents

• 1x PicoIO64 (pre-soldered)

Raspberry Pi Pico not included