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)
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3. TECHNICAL BRIEF
LGE Internal Use Only
Copyright © 2009 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Proximity Sensor
EUSY0358201
10
R534
2
ENB
GND
4
LEDA
7
LEDON
1
5
PD
PFILT
6
9
PGND
8
VCC
U505
APDS-9700
DOUT
3
C525
0.1u
R519
10
TP504
R520
100K
U504
QSDL-M900
3
DET_A
DET_K
41
LED_A
LED_K
2
R516
10K
C524
2.2u
VREG_MSMP_2.6V
C526
3300p
PROX_LEDON
PROX_EN_N
PROX_OUT
PROX_ADC
Figure. Proximity Sensor Schematic
MSM7201A(U202) GPIO91:
PROX_LEDON
PWM Output(17.5 kHz)
MSM Disable
PROX_ADC
To PMIC(U406) MPP_2(N2)
MSM7201A(U202) GPIO 30:
PROX_EN_N
QSDL-M900
Figure. Proximity Sensor Block Diagram
Summary of Contents for CT815
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