Power Up With The Power Switch (Pwronx) - Nokia NSB-7 Series Service Manual

PAMS Technical Documentation
battery, but the situation would be the same with full battery):
1 2
1: Battery voltage over 3.0==>Digital voltages to CCONT (VBB)
2: CCONT digital reset released. VCXO turned on
3: 62ms delay before PURX released
When the phone is powered up with an empty battery pack using the standard charger,
the charger may not supply enough current for standard powerup procedure and the
powerup must be delayed.

Power Up with the Power Switch (PWRONX)

When the power on switch is pressed the PWRONX signal will go low. CCONT will switch
on the CCONT digital section and VCXO as was the case with the charger driven power
up. If PWRONX is low when the 64 ms delay expires, PURX is released and SLEEPX control
goes to MAD. If PWRONX is not low when 64 ms expires, PURX will not be released, and
Issue 1 06/00
3
Figure 10: Power Up With Charger
ãNokia Mobile Phones Ltd.
NSB-7
System Module
SLEEPX
PURX
CCPURX
Vbat
VR6
VR1
VBB (2.8V)
Vchar
Vref
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