2023-01-27 08:26 AM
How to interface with more than 16-bit SPI devices, like a 20-bit ADC (e.g. ADS8900B)?
All but STM32H7 have 16-bit buffers (see AN5543). Are there ways to effectively use a 'lesser' microcontroller (e.g. STM32G0 or -G4)?
2023-01-27 09:34 AM
on many chips SPI is 8bit only (standard), so transfer of a 24bit number is just a 3 byte spi transfer sequence.
look at ds of the adc, most use 8bit transfers.
2023-01-27 10:01 AM
Just use the cheapest, basically ANY STM32 with SPI. It'll do for your requirements.
20-bit ADC will send data in serial manner, 3 bytes, one byte at a time on 1-bit SPI MISO bus.
2023-01-27 07:39 PM
If the ADC was very incompatible with MCU SPIs, they would reduce their market acceptance.
There should be something to make it easy from AD protocol design.
