The 2uA is approximate; I have a 50uA mechanical meter, and it barely moves from 0. My DMM has too much internal resistance. Anyways, that's what the RTC uses plus and leakage in the DC-DC converters. Every 75 seconds, the RTC draws a 'spike' of current to do the temperature-compensation, and it pegs the meter.
Since my battery is Li-ion, it's voltage varies from 3.7 to 4.1V depending upon state-of-charge. The FPGA and TTL devices only run on 3.3V, so I had no choice but to use a DC-DC converter; it has an integrated low leakage power switch. The HV DC-DC converter was a real pain, but I finally found a suitable NMOS device that had very low-leakage, low Vgs, and could tolerate the ~60V kickback from the transformer. -- 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 post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/21918d10-5971-4ee8-bdb8-bba18d4f4207%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
