[TriEmbed] Jeff's Response

[Pete Soper]

On 10/25/2013 11:19 AM, Pete Soper wrote:
> I agree that a simple battery arrangement is all that's needed if you 
> can achieve idle mode (33ua current draw) and make the code interrupt 
> driven.
> The 84's analog comparator can use the chip's internal 1.1v reference 
> vs a reference relative to the varying battery voltage if that 
> variation constitutes a problem. Using name brand AA cells and
Two things about this. A couple resistors to make a voltage divider that 
scales the battery voltage to <= 1.1 volts is needed, of course, but a 
low leakage transistor to turn the monitor on and off is also needed, 
otherwise the divider will suck the battery down all the time. As I 
recall Jeff H or Jim C described simple circuits for this "monitor on 
demand" situation at past meetings.

-Pete