Power On/Off - LG KC560 Service Manual

3. TECHNICAL BRIEF

3.4. Power ON/OFF

KC560 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 8). 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), KC560 system recognize whether remote power on or End-key pushed
RPW RON_E N
Figure 9 Remote power on and End-key power on circuit
LGE Internal Use Only
Figure 8 Power on application.
Remote Power O n
2V11_ RTC
R220
3.3M
R222
3.3M
1 2 3
C252
2.2u
EMX18
6 5 4
Q200
END_K EY_I N
END
PW RON
R225
END_K EY
4.7K
- 34 - Copyright © 2008 LG Electronics. Inc. All right reserved.
END_K EY_I N
KEY_RO W0
Q201
KTC4075 E
KEY_COL0
Only for training and service purposes