I have about 25 SPI digital pots (MCP41HV51) I want to control with an ATMEGA328. Datasheet says these pot aren't capable of being daisy-chained despite having SI and SO pins.
So obviously the MCU won't have enough pins for 25 Slave Select lines... I'm wondering if it's possible to connect an i2c/SPI port expander/shift register and use the expander's pins to control the 25 Slave Select lines? Obviously the clock and MISO/MOSI will be connected straight to the MCU.