• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 63 subscribers
  • Views 1676 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.

bq35100: Wrong measured Z with BQ35100EVM and LiSOCl2 battery

Jean-Philippe Verschueren
Intellectual 320 points
Part Number: BQ35100
Other Parts Discussed in Thread: BQSTUDIO

Support Path: /Product/Development and troubleshooting/Search the forums for my problem/

I have just started using the BQ35100 EVM with a LiSOCl2.

(1) I was unable to locate LiSOCl2 batteries in the chemistry database; I kept the default one.

(2)  Configuration of EOS mode is OK. Voltage, current and temperature readings are OK, but when issuing GAUGE_START/GAUGE_STOP commands sequences, the measured Z gets higher and higher and goes into saturation (i.e. 32767 or -32768). SOH_ERR and EOS_BAD_OCV are set.

Resetting the chip cause the measured Z to be reallistic againt (i.e. about 300 mOhms), but then measured Z gets erratic again (and increasing) when issuing new GAUGE_START/GAUGE_STOP sequences.

  • 0
    TI__Mastermind 34775 points

    Hi Jean-Philippe,

    Did you get this issue resolved? I will have my colleague follow up with you, if this issue is unresolved. Sorry for the delayed response.

  • 0
    TI__Mastermind 34775 points

    Hi Jean-Philippe,

    You will need to update bqStudio chemistry database: http://www.ti.com/tool/GASGAUGECHEM-SW. The chemID for LiSOCl2 should be 0607. ChemID 0606 is a generic ID as well.

    When you issue the GAUGE_START command did you applied a discharge load then remove the load and allow the cell to relax before issuing GAUGE_STOP command?

    What you should do is apply a discharge load then issue gauge start then remove load and let cell relax. This will update your measured Z correctly.

  • 0 in reply to Damian Lewis
    Intellectual 320 points

    Hi Damian,

    Is there any specs regarding the discharge load (e.g. > 50mA), the 'cell relax' level (e.g. < 50µA) and related time period durations?

    I am powering a MSP432 with the LiSOCl2 battery. The MSP432 is continuously triggering ADC acquisitions (with related external flash storage) that I cannot stop (critical process - I am not allowed missing data). This continuous mandatory background process leads to an average 5 to 10 mA consumption level.

    Is the bq35100 compatible with this 'relax' level?