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DS90UB941AS-Q1: Confirmation of the display and control functions from the host computer to the LCD screen.

Alon Chen
Intellectual 625 points

Part Number: DS90UB941AS-Q1

Tool/software:

Hi Team.
The customer plans to use DS90UB941ASRTDTQ1 and DS90UB948TNKDRQ1 to realize the display and control function from host to LCD screen;
Please help to confirm whether it is feasible to adopt the following scheme at the LCD screen side:
1. use pin 45 and pin 46 of DS90UB948TNKDRQ1 chip to connect two other IIC devices (light sensor, backlight power diagnostic) for data reading at the same time;
2. using the DS90UB948TNKDRQ1 chip's pin 16, pin 17, pin 18 to connect to the SPI port of the LCD screen to read the fault diagnostic information of the LCD screen;
3. using the DS90UB948TNKDRQ1 chip pin 8 to control the LCD screen backlight power supply PWM pin, control frequency 10KHZ;

Thanks.

  • 0
    TI__Guru 67850 points

    Hi Alon, 

    Thanks for your question. 

    Alon Chen said:
    1. use pin 45 and pin 46 of DS90UB948TNKDRQ1 chip to connect two other IIC devices (light sensor, backlight power diagnostic) for data reading at the same time;

    Yes - a I2C host controller on SER side can set up I2C aliasing to communicate to slave devices on display I2C bus.

    Alon Chen said:
    2. using the DS90UB948TNKDRQ1 chip's pin 16, pin 17, pin 18 to connect to the SPI port of the LCD screen to read the fault diagnostic information of the LCD screen;

    941/948 has SPI mode that allows for SPI communication between SER and DES. 

    Alon Chen said:
    . using the DS90UB948TNKDRQ1 chip pin 8 to control the LCD screen backlight power supply PWM pin, control frequency 10KHZ;

    10kHz forward channel GPIO PWM is possible. 

    Regards, 

    Logan