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TPS65910A3 From OFF-state to ACTIVE-state by PWRHOLD active

masahiko shimizu
Guru 11235 points
Other Parts Discussed in Thread: TPS65910

Hi,

My customer is using TPS65910A3.
His board is same as following EVM.
(Customer copied EVM)
-TMDSICE3359
www.tij.co.jp/.../TMDSICE3359

He has a issue.
TPS65910A3 does not go to ACTIVE state.
Power-on is operated by PWRHOLD signal high level.
PWRON pin is pull-uped by VBAT(VCC7).

When VCC7 is supplied 5V, VRTC is enabled.
But VREF is disabled even of PWRHOLD signal is high level.

What should we do for going ACTIVE state expect PWRHOLD signal high level?

Best regards,
Shimizu

  • 0
    TI__Genius 10885 points
    PWRHOLD should bring the PMIC to the ACTIVE state, do you see any activity on VREF when you short PWRON to GND?

    Can you confirm the full part number populated on the board?
  • 0 in reply to Richard Solarski
    Guru 11235 points
    Hi Richard,

    Thank you for your support.
    I will confirm about PWRON and about device number.

    During my confirming, I add a question.
    Please answer me.

    Add Q : For TPS65910 is into ACTIVE state, Does PWRHOLD active and PWRON active both need?
    I think only PWRHOLD active can operate ACTIVE state of TPS65910.
    I want to confirm whether both condition need or not.

    Best regards,
    Shimizu
  • 0 in reply to masahiko shimizu
    Guru 11235 points
    Hi Richard,

    I confirmed below.

    1. About short PWRON to GND
    My customer tried, but TPS65910 did not operate ACTIVE state.

    2. About device number
    My customer is using TPS659101
    Device printing is "T659101 A1 T1 2AK DEHP G4".

    And add information
    Customer changed BOOT from "BOOT0=GND BOOT1=VRTC" to "BOOT0=GND BOOT1=GND".
    Then, Device operated Active.
    (This is power -n by PWRHOLD active)

    I had thought that customer uses TPS65901A3. But He is using TPS659101.
    Is the reason of this issue to use TPS659101?
    　
    Best regards,
    Shimizu
  • 0 in reply to masahiko shimizu
    TI__Genius 10885 points

    Shimzu-san,

    The PMIC only needs one start condition, either PWRHOLD or PWRON, but testing the other one just confirms it isn't a single pin causing the issue.

    They need to use the TPS65910A3 or the TPS65910A31 for the AM335x w/ 1.5V for memory, as the TPS659101 is configured for S5PV210 and S5PC110 processors with different sequence and voltage requirements.

    When the PMIC is expecting an external crystal (CK32K_CTRL = 0), PWRHOLD may not be enough to bring the PMIC active. This is definitely the case when RTC_PWDN is 1, defined within the specific TPS65910x device's User's Guide.