NSW-6
System Module SE2
PAMS Technical Documentation
Page 22
Issue 1 12/99
Nokia Mobile Phones Ltd.
VR1 is used for the VCXO supply, and VR6 is used in COBBA for analog
parts. RFCEN signal to CCONT controls both VR1 and VR6 regulators;
they can be switched off in sleep modes, and during standby. However,
VR6 output is not switched off, but connected to VBB inside CCONT, in
order to avoid false accessory interrupts.
CCONT regulators are controlled either through SIO from MAD or timing
sensitive regulators are controlled directly to their control pins. These two
control methods form a logical OR–function, i.e. the regulator is enabled
when either of the controls is active. Most of the regulators can be individ-
ually controlled.
CHAPS connects the charger voltage (VCHAR) to battery. MCU of MAD
controls the charging through CCONT. MAD sets the parameters to
PWM–generator in CCONT and PWM–output controls the charging volt-
age in charger.
When battery voltage is under 3.0 V, CHAPS controls independently the
charging current.
Power Up
When the battery is connected to phone, the 32.768 kHz crystal oscillator
of CCONT is not started, since CCONT2 version F, until the power–button
is pressed. (Oscillator start may take up to 1 second). The regulators are
not started. After the crystal has started, the phone is ready to be pow-
ered up by any of the ways described below.
