12 Nov
2013
12 Nov
'13
8:09 p.m.
On Tue, Nov 12, 2013 at 7:51 PM, joem joem@martindale-electric.co.uk wrote:
Try this :) it popped up on Google pretty quickly --> http://www.hobbytronics.co.uk/schottky-logic-level-conversion
: awesome. done. added to spec.
Same problem - access to the 3.3V power line inside the EOMA needed.
no it is not. TTL 3v logic is somewhere around 2v for low. a small reduction (such as using another shottky diode) would be enough.
Anyway - 3rd diagram added - modified version of Henrik's diagram for the EOMA: http://www.gplsquared.com/eoma_boot/eoma_boot.html#uart_repair
great. 1.8+3.3=5.1 so the pull-up would be to 3.23V - enough to be definitely below 3.3v.
l.