Energy Management; Battery And Charging; Normal And Extreme Voltages - Nokia RM-509 Service Manual

Energy management

Battery and charging

BL-4S battery
The phone is powered by a 3-pole BL-4S 860 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.
The battery temperature can be measured from the UI flex.
Battery connector
The battery connector is a blade connector. It has three blades;
• BSI (Battery size indicator)
• GND (Ground)
• VBAT (Battery voltage)
The BSI line is used to recognize the battery capacity by a battery internal pull down resistor.
Charging
This phone is charged through a separate charger connector.
Charging is controlled by energy management, and external components are needed to protect the baseband
module against EMC, reverse polarity and transient frequency deviation.
Complementary USB charging is supported as well, in case the phone is connected to a PC or to a dedicated
USB charger.

Normal and extreme voltages

Energy management is mainly carried out in the ASIC PEARL/GAZOO. These circuits contain a number of
regulators. In addition there are some external regulators.
In the table below normal and extreme voltages are shown when a BL-4S battery is used.
Voltage
Nominal voltage
Lower extreme voltage
Higher extreme voltage (fast
charging)
Page 5 –10
Figure 31 Battery pin order
Table 11 Nominal voltages
Voltage [V]
General Conditions
3.700
3.145
4.230
HW Shutdown Voltages
COMPANY CONFIDENTIAL
Copyright © 2009 Nokia. All rights reserved.
RM-509; RM-510; RM-511
Condition
System Module
Issue 2