I built a wristwatch with the SP-151 display in direct-drive mode, using 335uA per segment. I've never seen any mention of recommended current for multiplexed operation, and running it too high will damage the display. So on that basis I stayed with direct-drive; doing that I dodged all of the nuances of multiplexing (ghosting, keep-alive, blanking interval, bias, audible noise, flickering, etc). Using a 4-layer PCB, I was able to tuck all of the segment-driver driver transistors (dual NPNs) and the 3 shift-registers in about the same footprint of the display itself, so the penalty of extra components for direct-drive is low.
Regarding the NEO-5000, I suggest you plot the I-V data for the segments to help you get the current set right. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/a308cd5b-e5d7-4b9f-8bcb-0d1d2e4defd9%40googlegroups.com.
