![Nokia NSB-7 Series Service Manual Download Page 38](http://html.mh-extra.com/html/nokia/nsb-7-series/nsb-7-series_service-manual_1699335038.webp)
NSB-7
System Module
PAMS Technical Documentation
Page 24
ã
Nokia Mobile Phones Ltd.
Issue 1 06/00
CCONT will go to power off (digital section will send power off signal to analog parts)
Figure 11: Power Up With Switch
Power Up by RTC
RTC (internal in CCONT) can power the phone up by changing RTCPwr to logical 1.
Power Up by IBI
IBI can power CCONT up by giving a short pulse (10ms) through the BTEMP line. After
powerup BTEMP will act as any other input channel for ADC.
When the PURX reset is released, the MAD releases the system reset ExtSysResetX and
the internal MCUResetX signals and starts the boot program execution from MAD
bootrom if MAD GenSDIO pin is pulled low or from external memory if GenSDIO pin is
pulled high. In normal operation the program execution continues from the flash pro-
gram memory. If the MBUS line is pulled low during the power up the bootrom starts a
flash programming sequence and waits for the prommer response through FBUS_RX line.
Power Down
The baseband is powered down by:
1
Pressing the power key, that is monitored by the MAD, which starts the power
down procedure.
2
If the battery voltage is dropped below the operation limit, either by not charging
it or by removing the battery.
3
Letting the CCONT watchdog expire, which switches off all CCONT regulators and
VBB (2.8V)
CCPURX
PURX
Vchar
1 2
3
1:Power switch pressed ==> Digital voltages on in CCONT (VBB)
2: CCONT digital reset released. VCXO turned on
3: 62 ms delay to see if power switch is still pressed.
VR1,VR6
SLEEPX
PWRONX