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Measuring the internal reference voltage using ADC | Cypress Semiconductor

Measuring the internal reference voltage using ADC

Summary: 2 Replies, Latest post by Ramesh B on 25 Oct 2016 02:06 AM PDT
Verified Answers: 0
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Elena Sorina Lupu's picture
1 post


I am trying to read the battery voltage, but the reference voltage (VDDA) is not stable at all. Therefore, the output of the ADC varies a lot. I was thinking to use another resistive divider to be able to reference everything to 1.024V, but I have a lot of PCBs and I do not want to make this modification on each. Therefore, I am wondering if there is a solution to measure the reference voltage and then, from this, calculate the real VDDA.

I am using a PSOC 4xx7 BLE


Thank you in advance

user_242978793's picture
973 posts

What is the exact part numbet?. I have found the reference voltage to be stable. You can use the internal vref and bring it out for measurement or other uses.

Ramesh B's picture
Cypress Employee
36 posts

Please refer the below link for more information:

If supply is not stable, and if this is being provided as reference, the ADC output won't be stable. So it is required to have stable power supply. For current fix, high capacitor can be connected in power supply lines which could remove fluctuations and make it stable. Let me know if this helps.


Ramesh B

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