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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
3.4 Power ON/OFF
KP500 Power State : Defined 3cases as follow
]
Power-ON : Power key detect (SM-Power’s ON port)
]
Power-ON-charging : Charger detect.
Input ON is a power-on input for SM-POWER with 2 active high levels (see Figure 6). It might be
triggered by a push button or by the RTCOUT output of the S-GOLD device as well. To detect if the
push-button is pressed during system operation the logical level at pin ON or its change (if Bit 1 EION
in INTCTRL2 is asserted) is recorded in bit LON of the ISF register. If the high level of voltage at pin
ON does not reach VIHdet (Vbat-0.8 ~ Vbat-0.3) the above-mentioned bit won t be set.
To support Remote power on function for factory mass production, applied an analog switch as
following figure. As monitoring the RPWRON and Key matrix KP_OUT(2) & KP_IN (0), KF350 system
recognize whether remote power on or End-key pushed
Figure 6 Power on application.
