Alc; Jtag & Etm Interface Connector - LG KF350 Service Manual

3. TECHNICAL BRIEF

3.10 ALC

The automatic luminance control (ALC) circuit adjusts the LED dimming by changing the LED current
automatically in response to the brightness of the surroundings. An external photodiode or similar
luminance sensor must be connected for the ALC automatic control to function. The luminance sensor
is connected to PD and must be set to increase the PD input current in response to increasing
luminance of the surroundings. In the typical application circuit in section 13, the SM8152A VREF
terminal is used and the luminance sensor photodiode is connected between PD and VREF
3.11 JTAG & ETM interface connector
Figure 15 JTAG & ETM(Embedded Trace Module) interface connector
In case of KF350 mass production, the JTAG & ETM interface connector will not be mount on board.
That is only for developing and software debugging purpose.( It will not be mounted on mass
production PCB)
LGE Internal Use Only
Figure 14 Average Iout vs Lux on photo sensor
2V62_VIO 1V8_SD
TRSTn
TDI
TMS
TCK
RTCK
TDO
EXTRSTn
TRIG_IN
- 46 -
CN101
G1 G2
1 30
2 29
TRACECLK
3 28
TRACEPKT7
4 27
TRACEPKT6
5 26
TRACEPKT5
6 25
TRACEPKT4
7 24
TRACEPKT3
8 23
TRACEPKT2
9 22
TRACEPKT1
10 21
TRACEPKT0
11 20
PIPESTAT2
12 19
PIPESTAT1
13 18
PIPESTAT0
14 17
TRACESYNC
15 16
G3 G4
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Only for training and service purposes