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 (CSA/CSB and CSC/CSD). 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 SIAB GP19 SPI IN for Expanders A/B SOAB GP20 SPI OUT for Expanders A/B SCLAB GP18 SPI Clock for Expanders A/B !IRQAB GP16 IRQ notify from Expanders A/B !RSTAB GP15 RESET for Expanders A/B CSA GP21 SPI chip select for Expander A CSB GP17 SPI chip select for Expander B SICD GP11 SPI IN for Expanders C/D SOCD GP12 SPI OUT for Expanders C/D SCLCD GP10 SPI Clock for Expanders C/D !IRQCD GP5 IRQ notify from Expanders C/D !RSTCD GP14 RESET for Expanders C/D CSC GP13 SPI chip select for Expander C CSD 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

* Documentation * CircuitPython XRA1403 library * XRA1403 product page Package Contents

* 1x PicoIO64 (pre-soldered) Raspberry Pi Pico not included