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Circuit

The MAX7219 display requires five connections to the Raspberry Pi Pico 2. This example uses SPI1 with GPIO 13, 14, and 15, but you can use any valid SPI pin set on your Pico.

Pico Pin Wire MAX7219 Pin
GPIO 13 (SPI1 CS)
CS / LOAD
GPIO 14 (SPI1 SCK)
CLK
GPIO 15 (SPI1 MOSI)
DIN
VBUS (5V)
VCC
GND
GND

Connecting Raspberry Pi Pico 2 with MAX7219 LED Matrix