I placed a TX0b304 between a PIC24FJ128GA202 and a 4 GB, Panasonic, RP-SMKC04, SDHC and communicate via SPI.
I was not reading the correct value after a write. After some reading I decided added 10 kohm pull-up resisters to the PIC side of the level converter.
Did not change the results.
Read the txb0304 spec again and read that if I were to add pull-up resistors then they should be greater than 20 kohm.
Q1: Do I need pull-up resistors for this application? I don't know if the SDHC card is open drain, collector or what not.
Q2: If yes then would which side of the level converter would I need to place them? PIC side, MSDC side, both, neither?
Thank you,
Craig