[TriEmbed] Jeff's Response

[Pete Soper]

Ah, the 84 has programmable brownout detection. No need for any of this 
below.
-Pete
On 10/25/2013 01:16 PM, Pete Soper wrote:
> 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
>
>
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