3-42
Theory of Operation
: Controller
Figure 3-30. Lighting Controller Overview
3.2.6.4 Keypad
The Full Keypad Model contains a 21 button keypad, which translates to a 5x5 row and column
keypad matrix as shown in
Figure 3-31
. The keypad also contains LEDs for the backlighting of the
keys, which is described in more detail in
Section 3.2.6.3: "Intelligent Lighting"
. Every key is assigned
a particular row and column to identify the unique key, as shown in keypad mapping
Table 3-7
. The
keypad board also contains 2, 6-channel filters that each row and column signal passes through.
Each row of the keypad contains an external pull-up resistor, and all the rows are interrupt based
inputs to OMAP. The columns are driven low by default in OMAP. When a key is pressed, the
corresponding key row and column are shorted together and causes a low level to be input on the
corresponding row in OMAP. Upon receiving the row interrupt, the OMAP IC is then programmed to
scan the column output to determine which corresponding column was selected that generated the
interrupt.
OMAP
VOUT
V_SW_5
V-REG
LED DRIVER
J2301
J2302
KEYPAD WHITE
ILLUMINATION
STATUS
R
53
55
57
58
60
56
32
34
36
38
G
A
R
G
A
TX/RX
FRONT DISPLAY
WHITE BACKLIGHT
PWR
LED0
LED1
LED2
LED3
LED4
LED5
LED6
LED8
LED9
LED10
LED11
SCL
SDA
RESET
A0
A1
A2
(LP3943)
LEVEL
SHIFT
(12C) SCL
(12C) SDA
RST_OUT
Summary of Contents for APX 2000
Page 1: ...APXTM TWO WAY RADIOS APX 1000 APX 2000 APX 4000 APX 4000Li DETAILED SERVICE MANUAL ...
Page 4: ......
Page 6: ...iv Document History Notes ...
Page 8: ...Notes vi Commercial Warranty ...
Page 10: ...Notes ...
Page 22: ...xiv List of Figures Notes ...
Page 226: ...6 64 Troubleshooting Waveforms LF CW on Spectrum Analyzer Notes ...
Page 688: ...Index 4 Index Notes ...
Page 690: ...ii Notes ...
Page 700: ...xvi List of Figures Notes ...
Page 806: ...5 50 Troubleshooting Charts PA Failure Notes ...
Page 1008: ...8 178 Schematics Boards Overlays and Parts Lists Transceiver RF Boards UHF2 84012621001 Notes ...
Page 1062: ...8 234 Schematics Boards Overlays and Parts Lists Keypad Board M2 and M3 PC000261A01 Notes ...
Page 1064: ...ii Notes ...
Page 1068: ...Notes A 4 EMEA Warranty Service and Technical Support Further Assistance From Motorola ...
Page 1090: ...Glossary 10 Glossary Notes ...
Page 1094: ...Index 4 Index Notes ...
Page 1095: ......