3. TECHNICAL BRIEF
- 42 -
3.9 Keypad Switches 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 27 switches (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.
VOL_UP
MENU
0
SEND
KEY PAD
SEL
7
6
5
3
CONF
RIGHT
END
#
VOL_DOWN
CAMERA
*
LEFT
4
1
CLR
T
9
UP
8
2
FAV
DOWN
R346
680
SW325
VA302
EVL14K02200
SW312
SW320
SW327
EVL14K02200
VA311
SW330
SW317
SW322
SW315
SW331
R344
680
SW323
VBAT
VA310
EVL14K02200
R329
680
680
R341
100
R321
R343
SW314
680
SW316
680
R342
SW319
R337
680
SW310
SW324
SW326
SW328
680
R333
680
R323
680
R345
0
10K
R317
R318
SW313
SW311
SW321
SW329
1
2
3
1
2
3
4
CN603
CN602
680
R347
SW318
SW308
R320
100
EVL14K02200
VA301
KEY_COL0
KEY_COL3
KEY_ROW5
KEY_COL1
KEY_COL2
KEY_COL4
SW309
KEY_ROW1
KEY_ROW2
KEY_ROW3
KEY_ROW4
KEY_ROW0
POWERKEY
Figure 3-27. Keypad Switches and Scanning
Summary of Contents for S5000
Page 1: ...Date November 2005 Issue 1 0 Service Manual S5000 Service Manual Model S5000 ...
Page 3: ... 4 ...
Page 82: ...4 TROUBLE SHOOTING 83 4 12 KEY backlight Trouble Test Points Figure 4 21 ...
Page 101: ...5 DOWNLOAD AND CALIBRATION 102 9 Phone test Finish is shown in below screen ...
Page 103: ... 104 ...
Page 111: ... 112 8 PCB LAYOUT ...
Page 112: ... 113 8 PCB LAYOUT ...
Page 113: ... 114 ...
Page 121: ...10 STAND ALONE TEST 122 Figure 10 2 HW test setting Figure 10 3 Ramping profile ...
Page 125: ... 126 ...
Page 126: ... 127 ...
Page 128: ... 129 12 EXPLODED VIEW REPLACEMENT PART LIST ...
Page 129: ... 130 ...