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Description
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.
| Signal | GPIO | Description |
| SI_AB | GP19 | SPI IN for Expanders A/B |
| SO_AB | GP20 | SPI OUT for Expanders A/B |
| SCL_AB | GP18 | SPI Clock for Expanders A/B |
| !IRQ_AB | GP16 | IRQ notify from Expanders A/B |
| !RST_AB | GP15 | RESET for Expanders A/B |
| CS_A | GP21 | SPI chip select for Expander A |
| CS_B | GP17 | SPI chip select for Expander B |
| SI_CD | GP11 | SPI IN for Expanders C/D |
| SO_CD | GP12 | SPI OUT for Expanders C/D |
| SCL_CD | GP10 | SPI Clock for Expanders C/D |
| !IRQ_CD | GP5 | IRQ notify from Expanders C/D |
| !RST_CD | GP14 | RESET for Expanders C/D |
| CS_C | GP13 | SPI chip select for Expander C |
| CS_D | GP2 | SPI chip select for Expander D |
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
Package Contents
- 1x PicoIO64 (pre-soldered)
Raspberry Pi Pico not included
