• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 98 subscribers
  • Views 105 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.

AM625: MMC1 Pull Up

Mari Tsunoda
Expert 5726 points

Part Number: AM625
Other Parts Discussed in Thread: SK-AM62B-P1

Tool/software:

Hi Team,

There are different pull up values recommended on different documents for MMC1(SD) MMC1_DAT0-3 and MMC1_CMD lines.

sprad21h and sprado3a suggest 47kΩ 

whereas

SK-AM62B-P1 schematic shows 10kΩ

Which should they follow?

Best regards,

Mari Tsunoda

  • 0
    TI__Guru**** 210880 points

    Hello Mari Tsunoda

    Thank you for the query.

    Mari Tsunoda said:

    SK-AM62B-P1 schematic shows 10kΩ

    Which should they follow?

    We have been initially using 10K that you see on the SK-AM62B-P1. We will be updating the values in the next revision.

    Based on the discussion with our device expert, we realized that there is a likely chance the pullup could be out of the SD card specification when a external pullup of 10K is used and processor internal pullups are enabled unexpectedly.

    Using a 47K ensures that the pullups are within the SD card specification even in use cases where the internal pullups are enabled unexpectedly.

    Regards,

    Sreenivasa