Tying SPI inputs together to run several ADCs at once

Question

Dear Community,I'm working on STM32H743ZIT6 based project.Here I want to set up 4 ADCs which have SPI interface.On developer's forum is said "If all ADCs will be sampled at the same point in time with the same settings, then the SCLK, CS, and SDI can be tied together".Also there mentioned: "Make sure the digital interface is able to drive all of the ADCs at once".Is STM32H743ZIT6 able to drive all of the ADCs at once?According to electrical characteristics:Digital high input voltage logic level - 0.7V x DVDD (min) / DVDD + 0.3V (max);Digital low input voltage logic level - -0.3 (min) / 0.2 x DVDD (max).DVDD = 3.3V Thanks!

Michal Dudka · Accepted Answer

You need to route:SCK from first SPI master to all ADCs and all SPI slavesMOSI from first SPI master to all ADCs SDISDO from ADC1 to MISO of SPI master SDO from ADC2 to MOSI of first SPI slave SDO from ADC3 to MOSI of second SPI slaveSDO from ADC4 to MOSI of third SPI slaveCS from STM32 to all ADCs

AScha.3 · Answer

Hi,>Is STM32H743ZIT6 able to drive all of the ADCs at once?Which ADC ? + SPI clk at ... ?+And where going the 4 SDO with data to ?

Sign up

Login with SSO

Login to the community

Login with SSO

Scanning file for viruses.

This file cannot be downloaded