ADP5062 JEITA1 Mode

Hello Gents,

I need one confirmation please:

When operating under JEITA1, does ADP5062 use the Beta NTC coefficient for any matter? I see in the below table it considers instead standard resistors measurements as follows:

Can you please confirm CI operation of beta for JEITA1 mode?

Thanks!

Att

Juliano

  • Hi Juliano,

    Yes, the beta setting does matter when using the JEITA function.

    The resistance values given in the spec table are based on the default register values, so for beta = 3150K.

    If you are using a different beta value, you should go by the temperatures listed in the spec table instead.

    Regards,

    Zack

  • Hello Zack, so you mean disregarding NTC use, find another way to monitor temperature and use the ICHG register?

    Thanks

    Att

    Juliano

  • Hi Juliano,

    No, you can still use the NTC, you just need to set the beta register to match the NTC you are using (or choose the closest value to your NTC beta value). There is no need to implement the temperature-compensated charging manually.

    With a different beta value selected, the JETIA region thresholds should still occur corresponding to the temperatures listed in the spec table.

    Regards,

    Zack

  • Hello Zack,

    We considered that but these are factory programmable parameters under DS table 43. Perhaps in volume production we can scale that but we are in pilot batch now. I was trying to find a way to operate the IC but it seems we reached a point that only practical testing with our NTC will give us a go-no-go.

    I see the part was built to operate with the NTC and the beta is relevant in all temperature readings. Lets hope the thresholds match as we cannot disable NTC.

    Thank you

  • Hi Juliano,

    Ah, I understand: you can't change the beta values at this point. Well, if rework is a possibility, you could consider adding resistance in series/parallel with your NTC skew the temperature readings in a way that is acceptable to you. There's no perfect way to do this (any series/parallel resistance will distort the resistance curve in a way that is unexpected to the ADP5062's JEITA thresholds), but perhaps it could be done such that it suits your needs safely.


    Regards,


    Zack