Nokia NSB-7 Series Service Manual page 31

PAMS Technical Documentation
by reading the BSI line DC-voltage level with a CCONT (N100) A/D-converter.
Name Min Typ
BSI 0
68
22
-5
BATTERY
The battery identification line is used also for battery removal detection. The BSI line is
connected to a SIMCardDetX line of MAD2. SIMCardDetX 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 contact disconnects before the other con-
Issue 1 06/00
Max Unit
2.8 V
kohm
kohm
5 %
VBATT
2.8V
BTEMP
BSI
R
s
BGND
Figure 6: BSI connections for all battery types
ãNokia Mobile Phones Ltd.
Notes
Battery size indication 100k pull-up resistor to
VBB in phone
SIM Card removal detection (Threshold is
2.4V@VBB=2.8V)
Indication of a BLB-2 battery (600mAh Li-Ion)
Indication resistor for a service battery
Indication resistor and pull-up resistor tolerance
TRANSCEIVER
100k
10k
BSI
10n
SIMCardDetX
NSB-7
System Module
CCONT
MAD
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