Proximity Sensor - LG CT815 Service Manual

3.15 Proximity Sensor

When call connected, the object is moved nearer to the proximity sensor.
LCD backlight and Touch screen is disable operation automatically.
U505 : APDS-9700 is the optical sensor control IC.
U504 : QSDL-M900 is Optical proximity sensor. (IrDA)
PROX_LEDON
PROX_EN_N
PROX_OUT
MSM7201A(U202) GPIO91:
PROX_LEDON
PWM Output(17.5 kHz)
MSM Disable
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Only for training and service purposes
Proximity Sensor
EUSY0358201
VREG_MSMP_2.6V
TP504 U505 APDS-9700
1 8
LEDON VCC
2 7
ENB LEDA
3 6
DOUT PFILT
4 5
GND PD
PGND
9
Figure. Proximity Sensor Schematic
Figure. Proximity Sensor Block Diagram
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3. TECHNICAL BRIEF
C524 C525
2.2u 0.1u
R534 10
R519 10
PROX_ADC
C526
3300p
QSDL-M900
PROX_ADC
To PMIC(U406) MPP_2(N2)
MSM7201A(U202) GPIO 30:
PROX_EN_N
LGE Internal Use Only