SDIO voltage levels

jeevanmahadevu — Mon, 18 May 2015 04:17:43 GMT

Hello,

Can we connect 1.8V device which communicates over SDIO directly to imx6 SDIO pins ? Or should we have level translator from 1.8V to 3.3V before connecting it to the imx6 SDIO pins

Regards,

Re: SDIO voltage levels

Yuri — Mon, 18 May 2015 05:14:42 GMT

The i.MX6 SL has two voltage suppliers : NVCC33_IO and NVCC18_IO.

The bit LVE in corresponding Pad Control Register defines what voltage will be

applied to the pin. Default value VLE=0 means 3.3V.

The i.MX6 SL has special recommendations, when using so called low voltage

design, in particular it relates to 1.8V SD cards. Please refer to section 7.2.4 (Power-up

sequence in low voltage system design) of the “Hardware Development Guide for i.MX

6SoloLite - User Guide”

http://cache.freescale.com/files/32bit/doc/user_guide/IMX6SLHDG.pdf

The i.MX6 D/Q/S/DL do not have ability to switch SD voltage internally.

An external scheme (power voltage switch or level translator) should be used.

Best regards

Yuri

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topic Re: SDIO voltage levels in i.MX Processors

SDIO voltage levels

Re: SDIO voltage levels