Nokia RH-6 Series Baseband Description & Troubleshooting page 13

CCS Technical Documentation
Battery BL-4C
Product RH-6 uses the so called "case-less" Li Ion battery BL-4C.
BL-4C battery capacity is 720mAh.
Main advantage of case-less battery types is the overall size, particular the thickness and
the number of contact terminals.
This battery has a three-pin connector (BTEMP is not used). The battery does not support
temperature measurement inside battery pack. In order to get temperature information
of the battery, a NTC is mounted on the PWB within the BB area.
Ni-based batteries are not supported by RH-6.
The resistor value for battery size indication (BSI) is 68 kohm.
Power distribution
Under normal conditions, the battery powers the baseband module. Individual regulators
located within the UEM regulate the battery voltage VBAT. These regulators supply the
different parts of the phone. 8 regulators are dedicated to the RF module of the phone,
and 6 to the baseband module.
The VSIM regulator is able to deliver both 1.8V and 3.0V DC and thus supporting two dif-
ferent SIM technologies. A register internally in the UEM controls the output of VSIM
and can be written to by the MCU via the CBUS.
The regulator VCORE is likewise adjustable and controlled by registers written by the
MCU. VCORE supplies the core of the UPP and can be adjusted on the fly by the MCU if
DSP capacity is inadequate. Higher VCORE supply (1.8 V) results in faster core operations
in the UPP.
The regulator VFLASH2 supplies the EL circuitry and EL sheet in touchpad module. The
regulator is controlled by the MCU
Regulators VANA, VFLASH1 and VIO are solely controlled by the UEM and cannot be
enabled or disabled by the MCU. Furthermore, VFLASH1 and VIO are both ON, though in
low quiescent mode when phone is in sleep mode. An output current of 500 µA can be
drawn from the regulators. VIO supplies the UPP, FLASH and LCD, VFLASH1 supplies LCD
and the IrDA module. VANA is supplying analogue parts internally in the UEM as well as
the baseband audio circuitry and pull-up resistors on the input of the UEM slow AD con-
verters.
System connector provides a voltage to supply accessories. The white LED's need a higher
voltage supply as the battery can provide in bad condition. Separate external regulators
supply both consumers.
The regulators VR1A, VR1B, VR2 - VR7 and IPA1 - IPA4 are controlled by the DSP via
the DBus. VR4 - VR7 are controlled by the UEM as well and are disabled in sleep regard-
Issue 1 10/2003
Company Confidential
6 - BB Description & Troubleshooting
© 2003 Nokia Corporation.
RH-6
Page 13