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7 inch LCD interface with AM335x

Viswanathan T
Prodigy 80 points

Hi

I'm planning to use 7 inch LCD module with AM335x. For this purpose, I'm using the Starter kit design which uses 4.3 inch LCD module. 

The LCD module with starter kit (4.3") & the one I'm planning to use (7") are both 40 pins, but the order of the signal pins are not in same order.

So for this, what are the changes should I have to make in the starter kit design to accommodate 7" LCD. i.e. Any hardware changes are required or this can be managed with the configuration using PinMux utility?

  • 0
    TI__Guru**** 393215 points
     Hi Viswanathan,
     
    Can you post the pinout of your display? I suspect you will need to make some sort of cross-over adapter, but I would like to compare the two pinouts.
  • 0 in reply to Biser Gatchev-XID
    Prodigy 80 points

    Hi 

    Thanks for your quick response. Please find below Pin details of 7" LCD module.

    S.No I/O Type Function
    1 P Power Voltage for LED Driver
    2 P Power Voltage for LED Driver
    3 I Adjust the LED brightness with PWM pulse
    4 P Ground for LED circuit
    5 P Ground for LED circuit
    6 P Power Voltage for digital circuit
    7 P Power Voltage for digital circuit
    8 I DE or HV mode control
    9 I Data Enable
    10 I Vsync signal input
    11 I Hsync signal input
    12 P Power ground
    13 I Blue data input (MSB)
    14 I Blue data input
    15 I Blue data input
    16 P Power ground
    17 I Blue data input
    18 I Blue data input
    19 I Blue data input (LSB)
    20 P Power ground
    21 I Green data input (MSB)
    22 I Green data input
    23 I Green data input
    24 P Power ground
    25 I Green data input
    26 I Green data input
    27 I Green data input (LSB)
    28 P Power ground
    29 I Red data input (MSB)
    30 I Red data input
    31 I Red data input
    32 P Power ground
    33 I Red data input
    34 I Red data input
    35 I Red data input (LSB)
    36 P Power ground
    37 I Sample clock
    38 P Power ground
    39 I Select left or right scanning direction
    40 I Select left or right scanning direction

    P - Power; I - Input

    Please refer link http://processors.wiki.ti.com/index.php/AM335xStarterKitHardwareUsersGuide#LCD for the pin details of the starter kit LCD module under LCD section.

  • 0 in reply to Viswanathan T
    TI__Guru**** 393215 points
    Definitely different. In my opinion the best way would be to design a crossover adapter. Two main differences: your display doesn't have touchscreen signals on the connector, and the backlight is completely different. The Starter Kit has the backlight driver on the main PCB, while your display has it on itself and needs LED power supply and PWM drive signal.