Nokia 6220 Service Manual
CCS Technical Documentation
System Module and User Interface
Company confidential
RH-20
Issue 1 10/2003
Nokia Corporation.
Page 25
In Active mode the RF regulators are controlled by SW writing into EM’s registers wanted
settings: VR1A can be enabled or disabled. VR2 can be enabled or disabled and its output
voltage can be programmed to be 2.78V or 3.3V. VR4 -VR7 can be enabled, disabled, or
forced into low quiescent current mode. VR3 is always enabled in Active mode.
voltage can be programmed to be 2.78V or 3.3V. VR4 -VR7 can be enabled, disabled, or
forced into low quiescent current mode. VR3 is always enabled in Active mode.
Sleep Mode
Sleep mode is entered when both MCU and DSP are in stand–by mode. Sleep is con-
trolled by both processors. When SLEEPX low signal is detected UEM enters SLEEP mode.
VCORE, VIO and VFLASH1 regulators are put into low quiescent current mode. All the RF
regulators are disabled in SLEEP. When SLEEPX=1 detected UEM enters ACTIVE mode and
all functions are activated.
trolled by both processors. When SLEEPX low signal is detected UEM enters SLEEP mode.
VCORE, VIO and VFLASH1 regulators are put into low quiescent current mode. All the RF
regulators are disabled in SLEEP. When SLEEPX=1 detected UEM enters ACTIVE mode and
all functions are activated.
The sleep mode is exited either by the expiration of a sleep clock counter in the UEM or
by some external interrupt, generated by a charger connection, key press, headset con-
nection etc.
by some external interrupt, generated by a charger connection, key press, headset con-
nection etc.
In sleep mode VCTCXO is shut down and 32 kHz sleep clock oscillator is used as reference
clock for the baseband.
clock for the baseband.
Charging
Charging can be performed in any operating mode.
RH-20 supports the standard NMP charger interface.
Supported chargers are ACP-7, ACP-8, ACP-12, LCH-12 and LCH-9.
Charging is controlled by the UEM ASIC and external components are needed for EMC,
reverse polarity and transient protection of the input to the baseband module. The
charger connection is through the system connector interface. The RH-20 baseband is
designed to support DCT3 chargers from an electrical point of view. Both 2- and 3-wire
type chargers are supported.
reverse polarity and transient protection of the input to the baseband module. The
charger connection is through the system connector interface. The RH-20 baseband is
designed to support DCT3 chargers from an electrical point of view. Both 2- and 3-wire
type chargers are supported.
The operation of the charging circuit has been specified in such a way as to limit the
power dissipation across the charge switch and to ensure safe operation in all modes.
power dissipation across the charge switch and to ensure safe operation in all modes.
Battery
780 mAh Li-ion battery pack BLD-3 is used in RH-20.
Description
Value
Nominal discharge cut-off voltage
3.1V
Nominal battery voltage
3.6V
Nominal charging voltage
4.2V
Maximum charger output current
850 mA
Minimum charger output current
200 mA