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BQ24780S: BQ24780S Query related

Max
Intellectual 920 points
Part Number: BQ24780S

Hi Sir,

We are using BQ24780S-EVM for our smart Battery testing.

In this, we have connected the board to 19V and 3.3V Power Supply but we could not charge the battery.

Issue:

We Have connected the EVM to the power supply with Necessary Jumper Settings. When the supply Voltage is given ACDET value is above  2.5V but the ACOK signal is not pulled high and the LED is not Glowing. We Have Also measured the REGN Voltage which is 0V when the Supply voltage is given to the board. The Impedance Occurs the VREGN and Ground is found to be 8.93Kilo Ohm.

Is the measured Impedance Value is Acceptable and what steps could be taken to make the board function properly?

Regards

ANANDAN N

  • 0
    TI__Genius 11850 points

    Hi Anandan,

    Section 7.3.1.2 of the datasheet lists the conditions that cause ACOK to be pulled up to the 3.3 V rail:

    Can you please provide a table with the following voltage measurements: ACDET, ACOK, VCC, VBAT, SDA, SCL, PROCHOT, and REGN? These measurements should help provide insight on why ACOK is not going high.

    Best regards,

    Angelo

  • 0 in reply to Angelo Zhang87
    Intellectual 920 points

    Hi Angelo

    Please Find below the measurements of voltages across the pin specified by you.

    S.No Pin Name Measured Values                      (in Volts)
    1 ACDET 2.55
    2 ACOK 0
    3 VCC 18.58
    4 VBAT 14.45
    5 SDA 3.2
    6 SCL 3.2
    7 PROCHOT 3.2

    Kindly look into it and give a positive reply.

    Regards

    ANANDAN N

  • 0 in reply to Max
    TI__Genius 11850 points
    Hi Anandan,

    Is REGN still 0 V, as you said in your original post? If so, then that's very unusual because the conditions to enable the REGN LDO are that ACDET > 0.6 V and VCC > UVLO, which are both true according to your table.

    Please describe your test setup in as much detail as possible so I can try to duplicate this issue on an EVM. A screenshot showing all your register settings would also be helpful.

    Best regards,
    Angelo
  • 0 in reply to Angelo Zhang87
    Intellectual 920 points

    Hi Angelo

    We are using BQ24780S EVM for charging our battery. The 3V3 supply and 19V board supply is given through power supply. The Jumper setting we have done is that JP6, JP1, JP2 are closed using jumper and JP3-Pin-01 is grounded through wire since we did not use comparator input pin. The Same is done in our EVM Boards used for testing. All are working properly But one board Seems to be odd.

    Note: WE have Connected the board for the first time and we are facing this issue.

    Kindly look into this and Resolve the Issue ASAP.

  • 0 in reply to Max
    TI__Genius 11850 points

    Hi Anandan,

    You can try again with the jumper settings given in the EVM User's Guide. However, if you're using the same test setup for all your EVMs and only one of them exhibits the issue, then it's likely that the IC was somehow damaged.

    Best regards,

    Angelo