Folder On/Off Detection - LG U8550 Service Manual

3.1.9 Folder ON/OFF Detection

There is a magnet to detect the folder status, opened or closed.
If a magnet is close to the hall-effect switch(U1 on Keypad), the voltage at Pin 1 of U1 goes to 0V.
Otherwise 2.8V.
This folder signal is delivered to MARITA GPIO43(FOLDER_DET).
VDIG
C2
0.1u
R1 100K
A3212EEH-T U1
6
VDD OUTPUT
5
NC2 NC1
4
GND2
7
PGND GND1
Folder Detect
Figure 3-1-10. Folder ON/OFF Detector
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FOLDER_DET
1
2
C1
3
10p
3. Technical Brief