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BQ34Z100-G1: Using the EVM board for evaluation

JAMES CHRISTENSEN
Prodigy 50 points
Part Number: BQ34Z100-G1
Other Parts Discussed in Thread: BQ34Z100, LM3409, BQ34Z100EVM

I am in the process of creating a multi-cell NiMH charger/gas gauge using the BQ34Z100-G1 EVM and the LM3409 EVM but I see that the BQ34Z100 EVM is not equipped with mounting holes  and, furthermore, the thermistor is soldered to the board and there is no provision to take the thermistor off the board. I am presuming therefore that the board is intended to be co-located with the batteries in a closed battery pack so the thermistor  can accurately read battery temperature. On the other hand all the indicator LEDs are located on the board implying that the EVM should be located in an open environment possibly separate from the batteries. 

Are there any solutions to this quandary other than de-soldering the on-board thermistor and running wires to a remote thermistor?

  • 0
    TI__Guru 73830 points
    James
    The bq34z100EVM was designed to evaluate the device and not for a production environment, so it is not optimized for use in a pack. You can remove the thermistor and use another one with long leads to allow you to connect it to cells.
    Tom
  • 0 in reply to ThomasCosby
    Prodigy 50 points

    Thanks a lot for your reply- I really appreciate it.

    I did remove the thermistor and replaced it with a header  .025 posts x 0.100 spacing. As I did so I noticed the holes were only about 30 mil diameter which is too small- they should be 35 mils to allow easy removal. I used a low melting temperature solder to free the thermistor leads without damaging the PCB pads. 

    I can now use Molex pre-crimped wires (Digikey WM15222) with a suitable housing and attach a thermistor directly to my battery pack per TI instructions for the BQ34Z100-G1.