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3. TECHNICAL BRIEF
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3.9 Keypad Switch and Scanning
The key switches are metal domes, which make contact between two concentric pads on the keypad layer of
the PCB when pressed. There are (Normal Key 24EA, Camera side key, Volume up down side key),
connected in a matrix of 5 rows by 5 columns and additional GPIO 35 for KEY_ROW5, as shown in Figure 3-
24, except for the power switch (KB1), which is connected independently. Functions, the row and column
lines of the keypad are connected to ports of AD6527. The columns are outputs, while the rows are inputs
and have pull-up resistors built in.
When a key is pressed, the corresponding row and column are connected together, causing the row input to
go low and generate an interrupt. The columns/rows are then scanned by AD6527 to identify the pressed
key.
Figure 3-24. Keypad Switches and Scanning
5
2
SEND
7
1
*
3
RIGHT
4
CAMERA
CONF
#
VOL_UP
UP
DOWN
CLR
VOL_DOWN
MENU
LEFT
0
Side Key
6
9
FAV
8
SEL
T
END
EVL14K02200
VA303
680
R354
R333
680
SW329
SW325
680
R352
SW321
100
R318
SW310
SW311
EVL14K02200
VA306
SW315
S71PL256NC0_TLA084
SW317
680
R323
R331
680
R301
10K
SW309
SW318
680
EVL14K02200
VA301
R332
SW314
R322
680
VA302
EVL14K02200
R319
100
100
R320
VA305
EVL14K02200
SW326
680
R324
SW312
SW306
SW324
SW322
VA307
EVL14K02200
SW328
VBAT
SW308
R356
680
R321
100
SW316
4
5
CN602
1
2
3
R343
680
SW313
SW327
SW323
SW307
SW319
680
R349
R302
680
SW320
KEY_ROW2
KEY_ROW5
KEY_COL1
KEY_COL0
KEY_COL4
KEY_ROW1
KEY_COL3
KEY_ROW3
KEY_ROW4
KEY_COL2
KEY_ROW0
POWERKEY
Содержание KG240
Страница 1: ...Date April 2006 Issue 1 0 Service Manual Model KG245 Service Manual KG245 ...
Страница 3: ... 4 ...
Страница 81: ...4 TROUBLE SHOOTING 82 4 13 KEY backlight Trouble TEST POINT Figure 4 20 a KEY Backlight Trouble ...
Страница 90: ...5 DOWNLOAD AND CALIBRATION 91 5 2 Download Procedure 5 2 1 Computer Program file MultiGSM exe Click ...
Страница 92: ...5 DOWNLOAD AND CALIBRATION 93 5 2 3 Configuration Setting C GSMULTI Model MG210 dll ...
Страница 93: ...5 DOWNLOAD AND CALIBRATION 94 5 2 4 Press Start Button KG245 ...
Страница 94: ...5 DOWNLOAD AND CALIBRATION 95 5 2 5 After Start Button Which Stand by condition KG245 ...
Страница 95: ...5 DOWNLOAD AND CALIBRATION 96 5 2 6 SW downloading Condition KG245 ...
Страница 96: ...5 DOWNLOAD AND CALIBRATION 97 5 2 7 SW downloading END Condition KG245 ...
Страница 99: ...5 DOWNLOAD AND CALIBRATION 100 4 Click on CALIBRATION START button KG245 KG245 ...
Страница 100: ...5 DOWNLOAD AND CALIBRATION 101 6 BLOCK DIAGRAM ...
Страница 101: ... 102 ...
Страница 110: ... 111 8 PCB LAYOUT ...
Страница 111: ... 112 8 PCB LAYOUT ...
Страница 112: ... 113 KG245 8 PCB LAYOUT ...
Страница 113: ... 114 KG245 8 PCB LAYOUT ...
Страница 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Страница 125: ... 126 ...
Страница 127: ... 128 ...
Страница 145: ...Note ...
Страница 146: ...Note ...