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Hello,
In the reference design CIRCUIT060003 at minute 1:53 there is an equation to calculate R1 which seems wrong. Using that equation the answer is 142 ohms. I could assume that the correct equation is (R@50+R@0)/2 which gives a value which could round to 10k.
Could someone confirm?
Thank you
Chris
Ok, I managed to find this document:
Temperature sensing with NTC circuit (Rev. A) (ti.com)
Uses NTC but R1 should be the same way; multiplication not addition inside the square root!
Hey Chris,
Thanks for catching our mistake!
You are correct, the R1 should be calculated with a multiplication:
There is a new revision of this circuit available on ti.com, this one doesn't require the additional power supply (Vref) and instead utilizes a voltage divider: Temperature sensing with PTC circuit (Rev. B)
As noted, the video on CIRCUIT060003 needs to be updated, we will fix it in the next revision.
In the meantime, please reference the correct above linked circuit design.
All the best,
Carolina