LG KE520 Service Manual page 39

3. Circuit Description
3.4.9 IO Connector
Pin # KE520
18Pin
1 FM_ANT
2 HSMICIP/HOOK DETECT
3 JACK_TYPE
4 HSO_L
5 HSO_R
6 UART3_TX/USB_DP
7 UART3_RX/USB_DM
8 JACK_DETECT
9 VBAT
10 VBAT
11 RPWON
12 VCHG
13 VGHG
14 UART3_DSR
15 VBUS_IN
16 UART2_TX
17 UART2_RX
18 GND
LGE Internal Use Only
Description
FM Radio ANTENNA
HEAD SET MIC
Jack type detection
HEAD SET Receiver Left
HEAD SET Receiver Right
USB/UART3 (Transmit Data)
USB/UART3 (Receive Data)
HAED SET insert detection
BATTERY(+4.2V)
BATTERY(+4.2V)
REMOTE POWER ON
CHARGING (VCHG)
CHARGING (VCHG)
UART3 Data Send Ready
USB POWER( +5.0 V)
TEST : UART2 (Transmit Data)
TEST : UART2 (Receive Data)
GND
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Only for training and service purposes