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bq500212AEVM-550 x bq51003EVM-764 they are compatible?

user3556070
Prodigy 80 points
Other Parts Discussed in Thread: BQ500212AEVM-550, BQ51003EVM-764, BQ500212A, BQ51003, BQ51050B

I used bq500212AEVM-550 evaluation board with bq51050EVM-764 and now is working fine.

But I can not getting to work with bq51003EVM-764!!! They are compaible?

  • 0
    TI__Prodigy 725 points
    Both of these devices can work with bq500212A EVM and have been tested. Please describe the details of your setup if you need to troubleshoot the startup problem.
  • 0 in reply to Upal Sengupta
    Prodigy 80 points

    Thank you, Upal.

    My setting:

    JP2: LOW
    JP1: LOW
    JP4: VZ
    JP3: EN
    TS-GND(R3); 10 kohms
    ADJ-GND: 600 ohms

    Without battery,
     bq500212AEVM
        D5(LED) : It is Flashing
        D7, D9: off
     bq51003EVM
        D1: on with small flashing

    With battery,
      same withou battery, but the receiver side, the D1 is turned on without small flashing.

    See the scope.

  • 0 in reply to user3556070
    TI__Prodigy 725 points
    If I am seeing the photo correctly, it looks like you are connecting the bq51003 output directly to your Li-Ion battery.
    The bq51003 will have 500mA output current limit (it is not designed for full 5W capability, but max 2.5W). The bq51050B is designed to be a direct battery charger but the bq51003 is NOT a battery charger. It can put out 5V constant voltage at up to 500mA. In your oscilloscope screen without battery, your TP7 (output) voltage shows 5.0V (the blue label says 4.5V but for 2V / division scale, this is 2.5 divisions or 5V). So that is normal expected output. And your VRECT value (TP12) is normal behavior from what I can see. If you connect the battery directly on the output of bq51003 you will force the chip into current limit mode and the voltage will collapse to the battery voltage. This is not the recommended operation. If you want to connect directly to the battery you must use either bq51050, bq51051, or bq51052 device depending on which battery voltage is right for your Li-Ion cell (4.2, 4.35, or 4.4V). The bq51003 will only put out 5V constant voltage, do not connect this directly to your battery.
  • 0 in reply to Upal Sengupta
    Prodigy 80 points

    Hello Sengupta,

    Thank you!

    I didn't know that. Thank you very much.