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VKost.2
Associate II
January 9, 2021
Solved

MCSDK: ICS gain range is 5V but ADC only works with 3.3V

  • January 9, 2021
  • 3 replies
  • 1306 views

Hi!

I am using F746ZG + IHM08M1. And I need configuration with 2 insulated current sensors.

My question is why in Workbench ICS gain is in range from -5V to 5V where the ADC max working range ist only 3.3V. Which current sensors should I buy 3.3V or 5V?

Thank you!

This topic has been closed for replies.
Best answer by Dario CUCCHI

Hi @VKost.2​ ,

A gain of 5V/A does not mean that the output is 5V.

The gain represents how many volts are present on the output with respect to the current flowing in the input.

For example if your sensor has a full scale of 0.5A and a gain of 5V/A, its output voltage is 5V/A * 0.5A = 2.5V that can be acquired by the ADC at 3.3V.

The output of the ICS (full scale) should be within 3.3V to be acquired by ADC, its gain should be optimized according to the maximum current expected in your application.

If this answer to your question, please select the label below “Select as Best�?.

This will help other community members with the same question to quickly find the answer.

Have a good day !

3 replies

Dario CUCCHI
Technical Moderator
January 11, 2021

Hi @VKost.2​ ,

A gain of 5V/A does not mean that the output is 5V.

The gain represents how many volts are present on the output with respect to the current flowing in the input.

For example if your sensor has a full scale of 0.5A and a gain of 5V/A, its output voltage is 5V/A * 0.5A = 2.5V that can be acquired by the ADC at 3.3V.

The output of the ICS (full scale) should be within 3.3V to be acquired by ADC, its gain should be optimized according to the maximum current expected in your application.

If this answer to your question, please select the label below “Select as Best�?.

This will help other community members with the same question to quickly find the answer.

Have a good day !

VKost.2
VKost.2Author
Associate II
January 11, 2021

I see now, Thank you!

Laurent Ca...
Senior III
June 1, 2021

The question has been moved from the "Motor Control Hardware" section to the "STM32 Motor Control" section (the question is about the STM32 SDK). 

Best regards

Laurent Ca...