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Controlling an SD card over a short cable

Jamaal_Charles
Genius 3245 points
Other Parts Discussed in Thread: P82B96

Hello,

We are trying to access a peripheral SD card that we have to connect to via a 2'-3' cable, and the interface isn't working with SDIO level translators (tried the ISL3034 and MAX13035E).  The Ti equivalents look like they are also designed for a short run between a processor and SD card slot. 

We found the following part, http://www.ti.com/lit/ds/symlink/p82b96.pdf, and are interested in using this for an MDIO level translator. However, it could be used in other applications as well. Can this part handle frequencies larger than 400kHz if we have a short cable run? Is there another part that would be more suited for this? We are desperately looking for a part to use for an SD card and the MDIO over cable.

Thanks!

  • 0
    TI__Guru 71526 points

      I'm looking at the Intersil ISL3034 and it is a 6-channel translator, operating up to 100Mbps, while the P82B96 is an i2C translator with a TYP speed of 400kbps, so these don't seem to be compatible interfaces.  If you could provide a block diagram or basic schematic of what the interface looks like (number of bits, etc) this will be very helpful. 

    Also, the ISL3034 has 15kV ESD protection, the P82B96 does not, is this a requirement?  One device you might look at that is more in-line with the ISL3034 is the SN74VCA406E whichis SD/MMC specific:  http://www.ti.com/product/sn74avca406e  .

    I'm sure we can find a device suitable to this application, just wanting to be sure we are looking in the right direction.

    -Leonard