Rtc Backup Battery; Buzzer - Nokia NSE–3 SERIES Service Manual

NSE–3
System Module

RTC Backup Battery

The RTC block in CCONT needs a power backup to keep the clock run-
ning when the phone battery is disconnected. The backup power is sup-
plied from a rechargable polyacene battery that can keep the clock run-
ning minimum of 10 minutes. The backup battery is charged from the
main battery through CHAPS.
Signal Parameter
VBACK Backup battery charg-
ing from CHAPS
Backup battery charg-
ing from CHAPS
VBACK Backup battery supply
to CCONT
Backup battery supply
to CCONT

Buzzer

Signal Maximum
output cur-
rent
BuzzPWM / 2mA
BUZZER
Page 3 – 16
Min Typ Max
3.02 3.15 3.28
100 200 500
2 3.28
80
Input Input
high level low level
2.5V 0.2V
PAMS
Technical Documentation
Unit Notes
V
uA Vout@VBAT–0.2V
V Battery capacity
65uAh
uA
Level (PWM) Frequency
range, % range, Hz
0...50 (128 lin- 440...4700
ear steps)
Original 11/97