AtomSoft Well-Known Member Nov 25, 2014 #1 Can i use a Zener on a data line? What would be better... I want to drop some SPI lines down to 3.3v (3.6v max) can i use zeners to simply drop the voltage of a HIGH ? and Low being low already... Or is using a BUFFER a MUST... which is better and why?
Can i use a Zener on a data line? What would be better... I want to drop some SPI lines down to 3.3v (3.6v max) can i use zeners to simply drop the voltage of a HIGH ? and Low being low already... Or is using a BUFFER a MUST... which is better and why?
4pyros Well-Known Member Most Helpful Member Nov 25, 2014 #2 I don't really know for sure, I have always just used level shifters. But maybe this will help https://www.faludi.com/bwsn/xbee-level-shifting/
I don't really know for sure, I have always just used level shifters. But maybe this will help https://www.faludi.com/bwsn/xbee-level-shifting/
MikeMl Well-Known Member Most Helpful Member Nov 25, 2014 #3 A Zener clamp at the listener input requires a resistance in series with the data line between the sender and the listener. That will slow down the signalling a bit. Does that matter? It might, depending on the data rates.
A Zener clamp at the listener input requires a resistance in series with the data line between the sender and the listener. That will slow down the signalling a bit. Does that matter? It might, depending on the data rates.
Ian Rogers User Extraordinaire Forum Supporter Most Helpful Member Nov 26, 2014 #4 I always use a potential divider... The last SPI module ( TFT screen ) I used, was running at 8Mhz + no problem..
I always use a potential divider... The last SPI module ( TFT screen ) I used, was running at 8Mhz + no problem..
Cicero Active Member Nov 26, 2014 #5 Yeah, I'd use a potential divider, or level shifters. Zeners require a decent amount of current, and it'll load your SPI bus.
Yeah, I'd use a potential divider, or level shifters. Zeners require a decent amount of current, and it'll load your SPI bus.