LG GX500 Service Manual page 46

GX500 Operational Description
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), GX500 system recognize
whether remote power on or End-key pushed
RPWRON_EN
RPWRON
Figure 3-10 Remote power on and End-key power on circuit
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LG Electronics
Remote Power On
KEY_ROW4
R209
END_KEY
10K
KEY_COL2
VA204
3 2 1
4 5 6
- 47 -
47/143
3. TECHNICAL BRIEF
Revision A
2V11_RTC
PWRON
Q201
LGE Internal Use Only
LGE Property