AM335x SDIO interface

Dharit Hothi

Other Parts Discussed in Thread: WL1831, AM3352, TXB0108

Hello Guys,

I am using AM3352 processor and I am connecting WiFi module with it by SDIO interface. I am using Murata wifi module which have WL1831 module inside.

My question is to change voltage level I am using TXB0108. At that time sometime we can not communicate well with wifi module. But If I replace TXB0108 (open drain) with TXS0108 (push pull) we get proper communication with wifi module.

I have verified all SDIO signals with TXB and TXS series translators. Signal rise and fall times are nearly same due to oneshot inside translator IC.

I know there are different hardware structure inside TXB and TXS make. But what difference makes TXS is most suitable with SDIO communication with AM3352?

over 9 years ago

0 Biser Gatchev-XID over 9 years ago

TI__Guru**** 393215 points

Hi,

TXB0108 has very low output currents (~ +/-20uA), which may not be sufficient either on processor side or WiFi module side.

0 peaves over 9 years ago in reply to Biser Gatchev-XID

TI__Guru 64015 points

The propagation delay of the level shifters could also be a factor. The product designer is responsible for performing a system level timing analysis of each peripheral that includes delays of all external devices and PCB traces. Where the propogation delay of these level shifters considered when performing timing analysis of this SDIO interface?

Regards,
Paul

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AM335x SDIO interface