PRECISION_BATTERY_VOLTAGE_MONITOR_FOR_HTS

Published:2009/6/24 22:29:00 Author:May | From:SeekIC

The precision voltage-monitor chip con-tains a temperature -compensated voltage ref-erence. R1 divides down the battery voltage to match the built-in reference voltage of IC1 (1.15 volts). When the voltage at pin 3 falls below 1.15 volts, pin 4 supplies a constant current of 7 mA to drive a small LED. About 0.2 LED) volt of hysteresis is added with R2. Without hysteresis, the LED could flicker on and off when the monitored voltage varies around the set point, as might be the case on voice peaks during receive.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Analog_Circuit/PRECISION_BATTERY_VOLTAGE_MONITOR_FOR_HTS.html

Print this Page | Comments | Reading(3)