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TPS659037: Power up and POWERHOLD pin of TPS659037

Conor
Mastermind 9320 points
Part Number: TPS659037

Hi,

Even if BOOT1 = 0, will the TPS659037 not power up if the POWER HOLD pin is LOW?

Thanks,

  • +1
    TI__Genius 13216 points

    Hi Koki,

    The BOOT0 pin and BOOT1 pin are used to select the power sequence used on startup. They do not generate or prevent on requests in the device. See section 5.4.6 of the datasheet.

    Also POWERHOLD being low will not prevent the device from powering up. Giving the POWERHOLD pin a high signal will generate an ON request to the device but there are other ways to generate ON requests, such as a low PWRON pin. For all the on requests see section 5.4.2 of the datasheet.

    If POWERHOLD is held low and the device is in POWERHOLD mode, the device will power 8s after completing the power sequence turning on. In POWERHOLD mode, the after the device powers up it must be acknowledged with the POWERHOLD being high or it will power down after 8s. For more information please see the POWERHOLD section of the datasheet section 5.4.5.1

    TPS659037 Datasheet: https://www.ti.com/lit/gpn/tps659037

    Thanks,

    Daniel W

  • 0 in reply to Daniel W
    Mastermind 9320 points

    Hi, Daniel 

    Thank you for telling me the details.

    Best,

  • 0 in reply to Daniel W
    Mastermind 9320 points

    Hi, Daniel 

    I have an additional question about booting the device.

    ・ PWRON pin ・ ・ ・ Open
    ・ RPWRON pin ・ ・ ・ Open
    ・ POWERHOLD pin ・ ・ ・ Low

    Will the device power in the above pin state? 

    In this case, will power not be supplied unless the POWERHOLD pin is set to High? (See Table 5-9. ON request)

    Also please let me know if you have any advice on how to handle PWRON and RPWRON when it is not in use.

    (I want to know if it is okay to be in the "Open" state.)

    Thanks,

  • 0 in reply to Conor
    TI__Genius 13216 points

    Hi Koki,

    The device will not power on in that state until the POWERHOLD pin is set high. As seen in the pin functions section of the datasheet, PWRON and RPWRON should be left floating if unused.

    Thanks,

    Daniel W