User Guide

NSD-5
3. System Module PAMS Technical Documentation
Page 32 Nokia Corporation Issue 1 05/02
Power Up When Charger Connected
Figure 16: Timing of power-up sequency by a charger
The power-up procedure is similar to the process described in the previous section, with
the exception that the rising edge of VCHAR triggers the power up in CCONT.
CCONT sets output CCONT_INT, MAD4 detects the interrupt and reads CCONT status reg-
ister to find the reason for the interrupt (charger in this case). After reading the A/D reg-
ister to determine that the charger voltage is correct, MAD should initiate charging
activities. The phone will remain in the so-called ”acting dead” state, which means that
only the battery bars are displayed on the LCD. The user perceives that the phone is off. If
the power-on button is pushed, the LCD display will come on and startup will be the
same as normal power on.
CCONT_INT is generated both when the charger is connected, and when the charger is
disconnected. It goes high when a valid charger is connected or the alarm clock times
out (real time clock). Once high, the MAD must actively reset this via the serial port. If
two interrupts occur at the same time, the interrupt line will not go high until all inter-
rupts have been cleared.
If the battery is empty (lower than 3.0V), CHAPS gives an initial charge (with limited cur-
rent) to the battery before the battery voltage rises above 3.0V. After the battery voltage
reaches 3.0V, the power-up procedure described in the previous section takes place. See
Figure 16 for timing information.