Power On/Off - LG KS360 Service Manual

3. TECHNICAL BRIEF

3.4 Power ON/OFF

KS360 series Power State : Defined 3cases as follow
] Power-ON : Power key detect (S-GOLDradio PWRON port)
] Power-ON-charging : Charger or USB detect.
Remote Power On
RPWRON_EN
R223
RPWRON
2K
END_KEY_IN
Figure 6. Remote power on and End-key power on circuit.
Input ON is a power-on input for S-GOLDradio with 2 active high levels (see Figure 6). It might be
triggered by a push button. 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 BJT as following figure.
As monitoring the RPWRON and Key matrix KEY_COL7 & KEY_ROW6, KS360 series system
recognize whether remote power on or End-key pushed
LGE Internal Use Only
2V0_VRTC
R221
PWRON
3.3M
1 2 3
C226
10u
EMX18
6 5 4
Q201
- 32 -
END
R222
END_KEY
10K
Copyright © 2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes
END_KEY_IN
KEY_COL7
KEY_ROW6