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STM32F373 BGA100 maximum SDADC differential channels

Associate II
Posted on August 28, 2015 at 20:46

I need to convert 9 differential inputs using the SDADC units on an 'F373.  The block diagram (in the RM) for one SDADC unit implies the input channel mux is only for one unit, not all three.  The F373 datasheet also states that up to 10 differential inputs are available.  If I assign three channels for each SDADC unit is there a conflict in the multiplexer?

SDACD1 channels 2, 4, 6

SDADC2 channels 0, 2, 8

SDADC3 channels 0, 2, 6

These are all separate pin pairs on the BGA100 package.

  Jack Peacock
Posted on August 29, 2015 at 04:12

I believe you are OK. The chip design is like ADCs, where there is a mux per ADC, and the restriction is that there should be only one ADC converting on any given pin at one time. For your channel selections there are no pins common between 2 or more SDADCs.

Cheers, Hal