Nokia 6233 - Cell Phone 6 MB, Руководство по обслуживанию

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Energy management
Battery and interface
The phone i powered by a 3-pole BP-6M S-pack 1100 mAh battery. The three poles are named VBAT, BSI and
GND where the BSI line is used to recognize the battery capacity. This is done by means of an internal battery
pull down resistor.
Figure 56 Battery pin order
Battery temperature is estimated by measuring separate battery temperature NTC via the BTEMP line, which
is located on the main PWB, at a place where the phone temperature is most stabile.
The connection from the charger connector to the charger is established via a charger adaptor type CA-44.
For service purposes, the device SW can be forced into local mode by using pull down resistors connected to
the BSI line.
Normal and extreme voltages
Energy management is mainly carried out in the two Application Specific Integrated Circuits (ASICs) RETU and
TAHVO. These two circuits contains a number of regulators. In addition there are some external regulators
too.
In the table below normal and extreme voltages are shown when a BP-6M S-pack battery is used.
Table 16 Nominal voltages
Voltage Voltage [V] Condition
General Conditions
Nominal voltage 3.9
Lower extreme voltage 3.215
Higher extreme voltage
4.23 (fast charging)
HW Shutdown Voltages
Vmstr+ 2.1 ± 0.1 Off to on
Vmstr- 1.9 ± 0.1 On to off
SW Shutdown Voltages
Sw shutdown 3.1 In call
Sw shutdown 3.2 In idle
Min Operating Voltage
Vcoff+ 2.9 ± 0.1 Off to on
RM-123; RM-145
System Module Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 8 –7
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