Power Up By Rtc; Power Up By Ibi; Power Down - Nokia NSB-7 Series Service Manual

NSB-7
System Module
CCONT will go to power off (digital section will send power off signal to analog parts)
1 2
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.

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
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Figure 11: Power Up With Switch
ãNokia Mobile Phones Ltd.
PAMS Technical Documentation
SLEEPX
PURX
CCPURX
PWRONX
VR1,VR6
VBB (2.8V)
Vchar
Issue 1 06/00