3-44
Theory of Operation
: Controller
3.2.6.2 APX 2000/ APX 4000/ APX 4000Li/ APX 1000 (900 MHz) LCD Display Modules
3.2.6.2.1 QVGA
The main Transflective 1.6" color display is a QVGA (160 x RGB x 90) active matrix TFT (Thin Film
Transistor) LCD. A display flex connects the main display to the J3-pin connector on Frontkit Flex.
The QVGA display uses the 8-bit Special optimized Screen Interface (SoSSI) for data and
commands.
Figure 3-34. Display Circuit Detail Overview Block Diagram
The QVGA LCD Module operates using V_2.775D and V_EXT_1.85. The V_2.775D is the module’s
analog supply voltage sourced by LDO6 of MAKO. The V_EXT_1.85 is the module’s IO voltage
sourced by the 1.85V external LDO regulator. An 8-bit parallel bus is used for data and command
communication between OMAP’s SoSSI interface and LCD driver IC. The F_DISP_DATA_CMD
signal indicated the type of data being sent to the driver. A ‘0’ corresponds to command data and a
‘1’ corresponds to display data. Data only travels in one direction, from OMAP to display driver.
Therefore F_DISP_RW line will always be low. Display data is latched on the falling edge of the
F_DISP_RW_EN signal.
The SoSSI interface uses the LCD DMA controller/bus to allow the LCD module to access system
memory. Therefore the transfer of pixel data process will require less CPU processing power. An
initiate DMA transfer command is used and display data is transferred to the LCD module
automatically without intervention thus offloading the processor.
OMAP
(R/W)
(D/C)
(CLK 4MHz)
(RST)
(D2)
(D3)
(D4)
(D5)
(D6)
(D7)
(D0)
(D1)
LCD_HSYNC
LCD_AC
LCD_PCLK
RST_OUT
LCD_PIXEL_0
LCD_PIXEL_1
LCD_PIXEL_2
LCD_PIXEL_3
LCD_PIXEL_4
LCD_PIXEL_5
LCD_PIXEL_6
LCD_PIXEL_7
MAKO
(V_2.775D)
(BOARD ID)
V06_O
ATOD_5
VOUT
DNP
DISPLAY
FLEX CONNECTOR
J3 PINS
V_EXT_1.85 (.004mA TYP.)
DNP
CPLD (INVERT)
IO87
IO39
0 Ω
47 Ω
4
F_DISP_RW
5
F_DISP_DATA_CMD
19
F_DISP_RW_EN (CLK)
18
OMAP_RESET
To display driver (HX8340B)
on display module.
22
F_DISP_DATA_0
F_DISP_DATA_1
F_DISP_DATA_2
F_DISP_DATA_3
F_DISP_DATA_4
F_DISP_DATA_5
F_DISP_DATA_6
F_DISP_DATA_7
F_DISP_BD_ID
V_2.775D (.68mA TYP.)
8
10
9
11
12
13
14
27
15
3
47 Ω
47 Ω
47 Ω
10k Ω
1.85V
V-REG
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: ......