Energy Management; Battery And Interface; Normal And Extreme Voltages - Nokia 6233 Service Manual

RM-123; RM-145
System Module

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.
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.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage
(fast charging)
Vmstr+
Vmstr-
Sw shutdown
Sw shutdown
Vcoff+
Issue 1
Figure 56 Battery pin order
Table 16 Nominal voltages
Voltage [V]
General Conditions
3.9
3.215
4.23
HW Shutdown Voltages
2.1 ± 0.1
1.9 ± 0.1
SW Shutdown Voltages
3.1
3.2
Min Operating Voltage
2.9 ± 0.1
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Condition
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On to off
In call
In idle
Off to on
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