• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 171 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB928Q-Q1: power-supply sequence between 925 and 928

user5063123
Prodigy 180 points
Part Number: DS90UB928Q-Q1

I'm using TI's FPD-LINK III Device,DS90UB925 & DS90UB928 for graphic application.And there is some question about power-supply sequence. When the 928 device powered-on before 925 device, FPD LINK device worked fine. And the TFTLCD display the image correctly. But when the 925 Device powered-on before 928 device,there is nothing on the TFTLCD. I think the problem is caused by sync method between 925 & 928. BTW,925 device's program is maked by others which can not be changed. So, what can I do with my local 928 device to solve the power-supply sequence problem? Thanks.

  • 0
    TI__Guru** 107740 points

    Hello,

    normally it should not make any difference if the SER is powered-up first or the DES.

    Can you try something, If the SER is powered-up first, then please monitor reg 0x1C[1:0], both bits should go high. once they are high, wait for 45ms and read them again, if they are still high, then apply a digital reset on the 928 by writing reg 0x01[0]=1.