PicoIO64

Description Show Reviews Assembled – PicoIO64 with soldered 2×20 headers and socket for a Pico/Pico2 [W] with headers. 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, etc. The I/O is arranged in two banks each with two 16-bit SPI expanders A/B and C/D, each bank has it’s 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 banks SPI interface to be controlled using a dedicated core of the RP2040/RP2350 at up to 26Mhz. 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 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. A library to use the XRA1403 I/O expander with CircuitPython can be found on Github . 0 Reviews Hide Reviews Show Reviews