Sleep Mode; Battery Charging - Nokia Mobile Phones NSE-5 Series Service Manual

PAMS
Technical Documentation

Sleep Mode

In the sleep mode all the regulators except the baseband VBB, Vcore and
the SIM card VSIM regulators are off. Sleep mode is activated by the
MAD2PR1 after MCU and DSP clocks have been switched off. The
voltage regulators for the RF section are switched off and the VCXO
power control, VCXOPwr is set low. In this state only the 32 kHz sleep
clock oscillator in CCONT is running. The flash memory power down input
is connected to the VCXO power control, so that the flash is deep
powered down during sleep mode.
The sleep mode is exited either by the expiration of a sleep clock counter
in the MAD2PR1 or by some external interrupt, generated by a charger
connection, key press, headset connection etc. The MAD2PR1 starts the
wake up sequence and sets the VCXOPwr control high. After VCXO
settling time other regulators and clocks are enabled for active mode.
If the battery pack is disconnect during the sleep mode, the CCONT shall
power down the SIM in the sleep mode as there is no time to wake up the
MCU.

Battery charging

The electrical specifications give the idle voltages produced by the
acceptable chargers at the DC connector input. The absolute maximum
input voltage is 30V due to the transient suppressor that is protecting the
charger input. At phone end there is no difference between a plug–in
charger or a desktop charger. The DC–jack pins and bottom connector
charging pads are connected together inside the phone.
MAD
0R22
VBAT ICHAR
PWM_OUT
MAD
CCONTINT
VCHAR
CCONT
GND
Issue 1 07/99
LIM
TRANSCEIVER
VOUT
CHAPS
27pf
RSENSE VCH
GND
PWM
47k
22k
1n
47k
Figure 9. Battery Charging
System Module
1.5A
33R/100MHz
1u
30V
EMI
CHRG_CTRL
L_GND
NSE–5
CHARGER
VIN
NOT IN
ACP–7/8
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