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BQ25185: The way to exit factory mode and BATOCP

Chase Jeong
Mastermind 6140 points
Part Number: BQ25185

Tool/software:

Dear TI experts,

Could you check the condition to exit factory mode and BATOCP of BQ25185?

Please check this issue. Thanks.

Best regards,

Chase

  • 0
    TI__Expert 3525 points

    Hello Chase,

    Factory mode and BATOCP can be exited by inserting a valid VIN.

    Exit Factory Mode:

    Inserting VIN is the only way to wake the BQ25185 from factory mode (refer to page 18 of the BQ25185 datasheet).

    The datasheet incorrectly states (section 8.3.8) that a push button can be used to wake the device from factory mode.

    Exit BATOCP:

    When the BQ25185 is in BATOCP, the BATFET will be off until a valid VIN is connected.

    If the BQ25185 is in BATOCP while a valid VIN is already present, then VIN must be toggled (removed and reinserted) to enable the BATFET and start another BATOCP detection cycle.

    Best regards,

    Alec Lehman

  • 0 in reply to Alec Lehman
    Mastermind 6140 points

    Dear Alec,

    Thank you for your support.

    Actually I posted about BQ25185 and you supported it. (maybe you know already.)

    https://e2e.ti.com/support/power-management-group/power-management/f/power-management-forum/1418622/bq25185-sys-does-not-detected-when-the-battery-is-connected

    My customer said that there is some noise from SYS pin so they have to use 47uF x 2 capacitors on SYS pin.

    And there are some other capacitors on the other IC's VIN which is connected to SYS pin.

    Here is my first question ;

    -> Do you think that it is effective for not entering BATOCP removing 47uF on SYS pin which is very close to SYS pin and adding removed 47uF on the other IC's VIN which is far from SYS pin?

    Finally one 47uF will move from SYS pin to other IC's VIN, not completely removing.

    Anyway your answer is that the only way to exit factory mode and BATOCP is toggling VIN if VIN is present. right?

    Here is my second question ;

    -> Can I know it is because of factory mode or BATOCP if SYS is not detected?

    And here is my last question ;

    -> Can I know that BQ25185 went to factory mode or BATOCP by external pin?

    Then I can control it using MCU and other device like load switch to toggle VIN.

    Please check this issue. Thanks.

    Best regards,

    Chase

  • 0 in reply to Chase Jeong
    TI__Expert 3525 points

    Hello Chase,

    Yes, I remember the thread you're referring to, and I'm happy to help.

    Chase Jeong said:
    -> Do you think that it is effective for not entering BATOCP removing 47uF on SYS pin which is very close to SYS pin and adding removed 47uF on the other IC's VIN which is far from SYS pin?

    It would be more effective to reduce the SYS inrush current by increasing the voltage rise time on the load capacitance. I recommend looking at the solutions mentioned in this App Note: Managing Inrush Current

    I anticipate that moving the 47uF capacitor further from the SYS pin would only have a negligible effect on reducing inrush current; increasing the voltage rise time is more important.

    Chase Jeong said:
    Can I know it is because of factory mode or BATOCP if SYS is not detected?

    It seems that this issue is being caused by BATOCP. The only way to enter factory mode is to hold the push button down for longer than tLPRESS while VIN is connected, then remove VIN once this duration has been met. Is the customer concerned that they are unintentionally holding the TS/MR pin low for 10s or more while an adapter is present?

    Chase Jeong said:
    -> Can I know that BQ25185 went to factory mode or BATOCP by external pin?

    When the BQ25185 is in BATOCP, the STAT1 and STAT2 pins will be low.

    Please let me know if the customer is able to reduce their system inrush current either by removing capacitance on SYS or by managing it with the methods described in the app note.

    Best regards,

    Alec Lehman