User Guide

NSB-5
System Module PAMS Technical Documentation
Page 24 Nokia Mobile Phones Ltd. Issue 1 03/01
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. Dur-
ing sleep mode, the phone wakes up periodically to page the base station for incoming
calls, location update, etc. The paging rate is a parameter set by the BS.
The sleep mode is exited either by the expiration of a sleep clock counter in the
MAD2WD1 or by some external interrupt, generated by a charger connection, key press,
headset connection, etc. The MAD2WD1 starts the wake up sequence and sets the VCX-
OPwr 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 tran-
sient 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.
Figure 9: Battery Charging
VIN
CHAPS
1n
PWM
VBAT
GND
CCONT
CHRG_CTRL
L_GND
CHARGER
PWM_OUT
TRANSCEIVER
0R22
VCHAR
ICHAR
47k
22k
1u
1.5A
30V
VCH
VOUT
RSENSE
GND
NOT IN
ACP–7/8
CCONTINT
MAD
LIM
MAD
27pf
EMI
47k
33R/100MHz