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Power supply ASIC
Pin Configuration in accordance with Component Specifications:
Functions
Pin
Requirements
ON_OFF
"Switching on" the
EXT_POWER
mobile phone
ON_OFF2
V1.0
A35-A36-A40
Implementation / Explanation
The following 3 "switch on" conditions will be accepted:
• Falling slope to ON_OFF
• Rising slope to EXT_POWER
• 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 "switch on" 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 "switch on". To do so VCXOEN
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 "switch on" (i.e. 120ms
from initial recognition of the "switch on" 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 "On-Off Keypad button"
RTC_INT>>>>>>>> to check the timer "on-off"
EXT_Power_µc>>> to check ON-OFF via accessory
Page 19 of 38
Company Confidential
(internal
ICM MP CC ST
09/01
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