Hello everyone, I have a question about a project I am currently planning. I need a lot of digital potentiometers for the project (about 288 pieces). These potentiometers must be able to withstand a voltage of at least 24v and a current of at least 25ma. I did some research and came up with the MCP 41HV51-50K. These actually have exactly what I need. I'm just wondering if my project will work with the SPI bus as the chip has a spi interface.
Well, that makes a lot of chips (unless you have a typo). Each MCP 41HV51-50K drives ONE potentiometer https://ww1.microchip.com/downloads/en/ ... 05207B.pdf and you need 288 chip select strobes (RPi has a maximum two). -> 288 chips, 288 chip select
Using bus expanders like MCP23017 is tricky : each bus expander has 16 IO lines -> you need 288/16 == 18 expanders, having different adresses (only the TWI version can be adressed ... up to 8 different adresses... This is not enough)
Statistics: Posted by dbrion1 — Wed Feb 21, 2024 1:49 pm