Power up when powerbutton is pushed

t1 < 1 ms t2 1 - 6 ms, VCXO settled t3 62 ms, PURX delay generated by CCONT

After PWR-key has been pushed, CCONT gives PURX reset to MAD and COBBA, and turns on VR1, VBB and VR6 regulators (if battery voltage has exceeded 3.0 V). VR1 supplies VCXO, VBB supplies MAD and digital parts of COBBA, and VR6 supplies analog parts of COBBA and some RF

Technical Documentation

System Module US4RSM

parts. After the initial delay t2 VCXO starts to give proper RFC to COBBA that further divides it to COBBACLK for MAD. COBBA will output the COBBACLK only after the PURX reset has been removed. After delay t3 CCONT releases PURX and MAD can take control of the operation of the phone.

After that MCU-SW in MAD detects that the PWR-key is still pushed and shows the user that the phone is powering up by starting the LCD and turning on the lights. MCU-SW must start also Rf receiver parts at this point.

CCONT will automatically power-up also VSIM-regulator (used for possible reFlashing), regardless of the control pin SIMPWR state, and the regulator default voltage is 3V. VSIM voltage could be selected to be 5V, by writing the selection via serial bus to CCONT, but that is not needed with the new Flash versions (Jaguar).

V5V-regulator (for RF) default value is off in power-up, and can be controlled on via serial bus when needed.

Phone can be powered up by external device (accessory or similar) by providing a start pulse to the battery signal BTEMP; this is detected by CCONT. After that the power-up procedure is similar to pushing powerbutton.

It is possible that PWR-key is pushed during charger initiated power-up procedure or charger is connected during PWR-key initiated power up procedure. In this kind of circumstances the power-up procedure (in Hw point of view) continues as nothing had happened.

When the Baseband HW is working normally and SW is running, SW detects that both conditions are fulfilled and then acts accordingly.

MAD (MCU SW) detects that PWR-key is pressed long enough time. After that the lights and LCD are turned off. MCU stops all the activities it was doing (e.g. ends a call), sends power off command to CCONT (i.e. gives a short watchdog time) and goes to idle-task. After the delay CCONT cuts all the supply voltages from the phone. Only the 32 kHz sleep clock remains running.

Note that the phone doesn't go to power off (from HW point of view) when the charger is connected and PWR-key is pushed. It is shown to user that the phone is in power off, but in fact the phone is just acting being powered off (this state is usually called acting dead).

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