Raspberry Pi SPI I/O Expander

Overview

Based around MAX7301 with 40 configurable GPIO. For more details, see MAX7301 datasheet.
The board allows the use of the two on-board MAX7301 like described in the datasheet but also adds support for selecting between 3V3 and 5V operation. Depending on the selection, the MAX7301 will operate at that voltage.

GPIO are broken out into 4 headers each with 10 GPIO plus additional grounds and 3V3 and 5V pins.
Will be shipped assembled in an ESD safe bag and with a short manual describing the pin-out. Pictured Raspberry Pi not included.

Compatible with all Raspberry Pi that come with the 40-pin header.

Transition detection INT signals from the MAX7301 ICs are wired to the Raspberry Pi 40-pin header.
Has been tested with Raspberry Pi 3 B+ with pigpio in C, and can reliably perform approximately 100,000 operations per second (8 bytes each).

Purchase