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STM32F4 Precision measure period of a signal

Question asked by anton.bogdan on Feb 26, 2017
Latest reply on Feb 27, 2017 by anton.bogdan

Hello all,

 

i need to measure an external clock source of 32768hz  with little variation as posible... this means to measure as true as possible,  with variations  maximum of +/- 2hz ...

 

Is this achievable with  input capture feature of a 32bit timer from the stm32f4?

 

From the hardware point of view, i was thinking to buffer the input with a opamp  just for impedance adaptation, and the output of the opamp to go into the timer channel

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