On Friday 04 September 2015 11:57:38 Jon Elson wrote: > On 09/04/2015 03:58 AM, andy pugh wrote: > > On 4 September 2015 at 02:16, Jon Elson <[email protected]> wrote: > >> Apparently, this device can't do bidirectional translation. > >> It can do 22 channels of conversion all going to a lower > >> voltage, or all going to a higher voltage. But, when wired > >> that way, it can't flip direction > > > > That's not the way that I interpreted the data sheet when I made the > > board for the 3.3V to 5V conversion on the RPi, and the boards > > appeared to work. > > Well, as a typical NXP data sheet, they leave a lot of > helpful info out. Looking at it for 5 minutes, I really > couldn't see how it worked to step up the voltage. Stepping > down seemed pretty simple. Glad it worked. > > Jon
Near as I could tell Jon, its all open collector, which is why I made the crack about it being hard on ones low ohmage resistor stock. 44 of them for that one chip's 22 channels. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
