Power On/Off - LG KF350 Service Manual

3.3 Power ON/OFF

KF350 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
R215
END_KEY
10K
(1%)
VA201
ICVN0505X150FR
Figure 7 Remote power on and End-key power on circuit
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
END_KEY_IN
KEY_ROW0
3 RPWRON_EN
Q202
2
KTC4075E
1
KEY_COL2
- 37 -
3. TECHNICAL BRIEF
R214
Q201
2SC5663
3.3M
R216
3.3M
C249
2.2u
END_KEY_IN
LGE Internal Use Only
2V11_RTC
R213
100K
PWRON
Q203
2SC5663