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SPI at 3.3v

Posted: 08 December 2012, 12:04 PM
by sturgessb
Hello all

I'm getting nothing back other than 255 when querying a SPI sensor (mpu6000), via hardware SPI on a zx24n, and just wondering if running the zx at 3.3v would cause any issues with SPI coms?

Normally everything is fine at 3.3v, but perhaps SPI is different for some reason?

B

Re: SPI at 3.3v

Posted: 08 December 2012, 14:33 PM
by dkinzer
sturgessb wrote: wondering if running the [ZX-24n] at 3.3v would cause any issues with SPI coms?
That supply voltage is too low for a ZX running at 14.7MHz. In such a case, the device may behave in any manner it sees fit.

You're best advised to use a ZX running at 7.37MHz *or* run the ZX at 5V and use level converters on the SPI signals.