microSD card data line pull-up resistor in RT1052

[deega_jung]

Hello NXP community,

Inquiry of the microSD card data line pull-up resistor,

According to AN10911, MicroSD CARD's DAT0/1/2 line has recommended the pull-up resistor. However, the EV-Kit reference circuit of RT105x uses only DAT0 pull-up, and DAT1/2 does not have pull-up.

What's the reason?

Thanks,

Deega

[jeremyzhou · Accepted solution]

Hi，
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
1) What's the reason?
-- The alternative method is to enable the internal pull-up resistor, in another word, the external resistor is not definitely necessary.
Have a great day,
TIC

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[deega_jung]

Hi TIC,

Thank you for your comments.

Thanks,

Deega