AnsweredAssumed Answered

how to protect analog inputs ?

Question asked by karakaya.mehmet on Feb 20, 2013
Latest reply on Feb 21, 2013 by karakaya.mehmet
hello forum,

I am using analog inputs of STM32F103 to measure current of a DC motor using ACS714
hall effect sensor
however at first trial the analog inputs burned becouse of high frequency ringing ( caused by the PWM ) at the measured signal

my question

can I use following circuit to protect analog inputs ?
I have checked user manual of F103 there it says max analog input voltage VDD+0.3 V
minimum VSS-0.3 V

however with this diode network max voltage will be VDD+0.6 Volts and minimum
VSS-0.6 Volts

any advice , thank you
analog.jpg

Outcomes