RE46C190 datasheet(28/42 Pages) MICROCHIP

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RE46C190

DS22271A-page 28

 2010 Microchip Technology Inc.

5.1.3

LOW BATTERY CHECK CURRENT

The Low Battery Check Current is the current required

for the low battery test. It includes both the loaded

(RLED on) and unloaded (RLED Off) tests. The boost

component of the loaded test represents the cost of

charging the boost capacitor to the higher voltage level.

This has a fixed cost for every loaded check, because

the

capacitor

gradually

discharged

during

subsequent operations, and the energy is generally not

recovered. The other calculations are similar to those

shown in Equation 5-1. The unloaded test has a

minimal contribution because it involves only some

internal reference and comparator circuitry.

5.1.4

BATTERY LIFE

When estimating the battery life, several additional

factors must be considered. These include battery

resistance, battery self discharge rate, capacitor

leakages and the effect of the operating temperature

on all of these characteristics. Some number of false

alarms and user tests should also be included in any

calculation.

For ten year applications, a 3V spiral wound lithium

manganese dioxide battery with a laser seal is

recommended. These can be found with capacities of

1400 to 1600 mAh.

RE46C190 데이터시트(PDF) 28 Page - Microchip Technology