A35 fe.
(«Телесистемы»: Конференция «Микроконтроллеры и их применение»)

миниатюрный аудио-видеорекордер mAVR

Отправлено PlainUser 07 октября 2003 г. 11:28
В ответ на: Как реализована включение питания в сотовых телефонах? отправлено pxva 07 октября 2003 г. 10:30

The following 3 Ў§switch onЎЁ conditions will be accepted:
„h Falling slope to ON_OFF
„h Rising slope to EXT_POWER
„h Rising slope to ON_OFF2
If one of this 3 conditions is recognised, the ASIC switches into the POWER-Up state and the internal oscillator starts.
After T1 (approx. 60ms) the source of the Ў§switch onЎЁ signal is checked again. If the required level is no longer present, the mobile phone will not switch on and the ASIC switches to the POWER-DOWN mode. If the required level is still there, the mobile phone will Ў§switch onЎЁ. To do so VCXOEN (internal SLEEP) will go to HIGH and the 3 voltage regulators VREG1 (2,9V), VREG2 (2,0V)and VREG3 (2,65V) are active.
After T2 (approx. 60ms) counted from Ў§switch onЎЁ (i.e. 120ms from initial recognition of the Ў§switch onЎЁ condition) the supply voltages for 1V9, 2V65 and 2V9 will be checked. If the 1V9 and 2V9 voltages are in order, timer T3 will start and RESET will be enabled after approx. 60ms.
To ascertain by what signal the phone was switched on, the E-Gold checks the following signals.
KB7 >>>>>>>>>>> to check the Ў§On-Off Keypad buttonЎЁ
RTC_INT>>>>>>>> to check the timer Ў§on-offЎЁ
EXT_Power_ѓЭc>>> to check ON-OFF via accessory

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