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Is it possible and how to use other GPIOs than ADC_INxx as analog inputs ?

YRAGO
Associate

The Reference Manual of the STM32L1 talks about "Up to 40 external I/OS can be used far data acquisition purpose in conjonction with the ADC interface".

The ADC_INxx pins number is smaller...

I saw that we can root pins with the "Routing Interface" peripheral.

Is it possible and how to use other GPIOs than ADC_INxx as analog inputs ?

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2 REPLIES 2

>>Is it possible and how to use other GPIOs than ADC_INxx as analog inputs ?

NO

You can put the pins in to an analogue mode, in this context it will turn off the schmitt trigger on the digital side of the input.

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waclawek.jan
Super User

They are not available in every 'L1 model, and not in every 'L1 package.

I looked into STM32L151xD datasheet and counted 43 ADC_IN pins (although they repeat so can't be used simultaneously).

JW