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Clarifications on the schematics

electronicsLearner77

Jul 2, 2015
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I am trying to run motor using the ST board B-G431B-ESC1 and the schematics are available in the link provided(I could not attach schematic as it is big). But i have several doubts,
a. There is OUT1 signal on page5, my understanding is it will be between 0 and V+, 0 when Low MOSFET is ON and V+ when the upper MOSFET is ON. Is it correct?
But this circuit
1671731426648.png
cannot measure battery voltages above 3.3V in that case D10 will be Forward biased and the BEMF1 signal will always be 3.3V. Please advise.
 

Harald Kapp

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There are 3 schematics behind that link. Which one do you refer to?
 

Harald Kapp

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There is OUT1 signal on page5
You mean the signal on page 6, right?
when Low MOSFET is ON and V+ when the upper MOSFET is ON.
Which MOSFETs are these in the schematic?
this circuit ... cannot measure battery voltages above 3.3V
Looks like this is an output controlled by teh BEMF signals. Why do you think there are voltages > 3.3 V to be measured by this circuit?

You need to read the documentation that accompanies this schematic. Since the GPIOs can (as the name states) be used for a manifold of different purposes, understanding the circuit requires knowledge of th eintended function of the GPIO pins. You don't find this information in the schematic.
 
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