STM CircleOS forum / SPI IO voltage 5 volt tolerant on Primer 2

NicFromParis · 2010-03-23 08:51:15

Hello,

Do you think that the SPI interface is FT (5 volt tolerant) on the extension board ?
And what about hte other interfaces (I2C, USART, ...) ?
Thanks.

Regards,

Nicolas

NicFromParis · 2010-03-23 09:12:37

According to page 32/123 of the STM32 DS (http://www.st.com/stonline/products/lit … /14611.pdf) the SPI2 is FT (+5V tolerant).

ntrf.zns · 2010-03-23 16:40:35

It still may not work. If "other-side-device" using 5V signals on SPI, then it will also expect 5V signals form STM32. Unlike I2C (where you can use pull-ups with any voltage required) SPI reqires some of it's pins (MOSI and SCLK) to be push-pull outputs with 2.8V range.

In primer2 it will be a bad idea because SPI is connected to audio codec!

I recomend you find a low-voltage version of your "other-size-device", or use some kind of convertor.

# 1 2010-03-23 08:51:15 SPI IO voltage 5 volt tolerant on Primer 2

SPI IO voltage 5 volt tolerant on Primer 2

# 2 2010-03-23 09:12:37 SPI IO voltage 5 volt tolerant on Primer 2

Re: SPI IO voltage 5 volt tolerant on Primer 2

# 3 2010-03-23 16:40:35 SPI IO voltage 5 volt tolerant on Primer 2

Re: SPI IO voltage 5 volt tolerant on Primer 2

Board footer