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Only for training and service purposes
3. TECHNICAL BRIEF
GS290 Operational Description Revision B
LG Electronics 37/136 LGE Property
3.4. Power ON/OFF
GS290 Power State : Defined 3cases as follow
ඖ Power-ON : Power key detect (SM-Power’s ON port)
ඖ Power-ON-charging : Charger detect.
Figure 6 Power on application.
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 (6), GS290 system recognize whether
remote power on or End-key pushed
GS290 Operational Description Revision B
LG Electronics 38/136 LGE Property
Figure 7 Remote power on and End-key power on circuit
3.5. SIM & uSD interface
GS290 supports 1.8V & 2.9V plug in SIM, SIM interface scheme is shown in (Figure 8).
SIM_IO, SIM_CLK, SIM_RST ports are used to communicate with BBP(S-Gold3) and the SIM power supply
enabled by PMIC.
SIM Interface
SIM_CLK : SIM card reference clock
SIM_RST : SIM card Async /sync reset
SIM_IO : SIM card bidirectional reset
Figure 8 SIM & Micro SD Circuit
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