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am335x starter kit board's power

shanqing liu
Intellectual 635 points

Hi,

   I have a question about AM335x starter kit board's power.

   The power IC tps65910a3 , pin 29(VRTC) connect pin 19(boot1), U21 TPS71718 power output also connet to this net.

   I read tps65910a3 datasheet, the pin 29 VRTC is regulator output. why TPS71718 power output also connect to this pin?

  In starter kit board ,the tps65910a3 boot0 = 0 boo1= 1(VRTC). In datasheet it is called eeprom sequence,but I can

 not open the link in page43 for details about eeprom sequence.

  If I choose the wrong power sequence ,Will the cpu be damaged?

Now my design didn't connect TPS71718 output to tps65910a3's pin 29 and pin 19,any problem?

uboot kernel and app run normally on my board ,but the cpu is overheated ,even if there is no any SW(include uboo kernel ).Is it ralated with power on sequence?

  • 0
    TI__Guru**** 393215 points

    Hi,

    shanqing liu said:
    I read tps65910a3 datasheet, the pin 29 VRTC is regulator output. why TPS71718 power output also connect to this pin?

    If you check the SK schematics you will see that there are two nets - VRTC and VRTC_PMIC.

    shanqing liu said:
    If I choose the wrong power sequence ,Will the cpu be damaged?

    Yes.

    shanqing liu said:
    Now my design didn't connect TPS71718 output to tps65910a3's pin 29 and pin 19,any problem?

    Check this document for proper connections: http://www.ti.com/lit/ug/swcu093c/swcu093c.pdf