Battery Identification - Nokia NSE-6 SERIES Service Manual

PAMS
Technical Documentation

Battery Identification

Different battery types are identified by a pulldown resistor inside the bat-
tery pack. The BSI line inside transceiver has a 100k pullup to VBB. The
MCU can identify the battery by reading the BSI line DC–voltage level
with a CCONT (N100) A/D–converter.
BATTERY
R
The battery identification line is used also for battery removal detection.
The BSI line is connected to a SIMCardDetX line of MAD2 (D200). SIM-
CardDetX is a threshold detector with a nominal input switching level
0.85xVcc for a rising edge and 0.55xVcc for a falling edge. The battery
removal detection is used as a trigger to power down the SIM card before
the power is lost. The BSI contact in the battery pack is made 0.7mm
shorter than the supply voltage contacts so that there is a delay between
battery removal detection and supply power off.
Vcc
0.850.05 Vcc
0.550.05 Vcc
SIMC
GND
Original 08/98
BVOLT
BTEMP
BSI
s
BGND
D X
ARD ET
VBB
2.8V
TRANSCEIVER
100k
10k
BSI
10n
SIMCardDetX
NSE–6
System Module
CCONT
MAD
S O
IG UT
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