• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 315 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Wrong temperatures readings with bq78pl114S12!!

Brayts
Prodigy 225 points
Other Parts Discussed in Thread: BQ78PL114, BQWIZARD

Hi,

I'm using a bq78pl114S12 and I have some problems to get correct readings of temperature. I built a pcb for the two components which form the temperature sensor and its everything all right with them (I already checked).

The temperature readings that I get are always bigger that 2000ºC!!! I don't understand why? I have the bq working well in the rest, i.e. the comunications seems well to me, the voltage and the current are reading well (here the value that I get is the one that I expected) and I just modifi the configuration file aux for the capacity of my bateries (90Ah)(I'm using 4 series cells), so the device is probably well configurated.

I did several times the calibration, as told to in bq78pl114 8s EVM user's guide(SLUU335) page14 and I always obtain the wrong readings!?

Can someone tell me what else I can try or check?

Best regards,
Brayts 

  • 0
    Prodigy 225 points

    Hi,

    My problem still remains...I don't know what else to do...

    Any suggestions??

    I present next one snapshot of my readings, where you can see the strange values of the temperatures...

    regards,

    Brayts

  • 0
    TI__Guru 54715 points

    3 possibilities come to mind:

    1. Analog problem. Check analog connections to be sure the proper diode type is connected with the proper polarity to the proper reference voltage nodes.  Check also that there are not unexpected connecctions to the nets.

    2. Configuraiton problem. If the tmap file was changed the device may be sending the wrong values for temperature.  Load and relearn/initialize a known good tmap file and see if this changes or fixes the issue.  If an edited tmap file is needed for the parallel cell count number, be sure there were no extra characters inserted by the editor.  Unfortunately the current tools do not check the file.

    3. Data problem.  Calibration data may be sent to the device wrong or displayed wrong. Try entering the the temperature calibration value as a whole degree without a decimal. bqWizard 2.5.7 has a locale issue which manifests itself in different ways.  Try setting the PC Regional Option Standards and formats to English (United States) and location to United States

    Once temperature readings are correct, current should be re-calibrated since there is a temperature influence on current.

  • 0 in reply to WM5295
    Prodigy 231 points

    I had a similar problem. Setting the Windows Regional Option Standards to English (US) does the job, I didn't have to change the location as well.