Are you already using 5V directly with your microSD card?I know that, but as I said, I'm wondering if the card detect is simply a switch that gets connected when the card gets inserted. If it is, and it's not electrically connected to the microsd, I'm safe using a 5V pullup. That means I don't have to do a level translation from 3.3V to 5V.
No, I have a voltage regulator to provide 3.3V from the 5V supply, and the circuit is set up to properly interface the 3.3V and 5V devices.Are you already using 5V directly with your microSD card?
This is why I want to use a 5V pullup. The micro I'm using has a minimum logic high of 3.25V, which means I have to use a mosfet to translate the 3.3V to 5V on all outputs of the microsd. If I can use a 5V pullup for the card detect line, I can avoid one mosfet and the associated resistors.Also, most 5V ICs will accept anything >2V as logic high. Check the datasheet for minimum inputs; stay clear of them, and you should be fine with 3.3V.