Series resistor of 200 Ohm on SD_CLK

BuGless
Posts: 10
Joined: Wed Sep 09, 2015 1:28 am

Series resistor of 200 Ohm on SD_CLK

Postby BuGless » Wed Sep 09, 2015 3:50 am

How is that value of 200 Ohm determined?
What if I'd use 300 Ohm instead; would that work better, worse, equally well? Why not?

Espressif_Kelly
Posts: 140
Joined: Mon Oct 27, 2014 10:40 am

Re: Series resistor of 200 Ohm on SD_CLK

Postby Espressif_Kelly » Wed Oct 14, 2015 11:45 am

Dear BuGless,

The resistor on SD_CLK is for lowering the driving current, decreasing cross-talk and external interruption, adjusting timing sequence, and so on.

200ohm is a reference value and you can adjust it on the situation.

Thanks.

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