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DS90UB949A-Q1EVM: DS90UB949A-Q1:I2c error, causing the screen to go out

xinyu wu
Prodigy 115 points
Part Number: DS90UB949A-Q1EVM
Other Parts Discussed in Thread: DS90UB949A-Q1

Dear Ti :

1. I am using the ds90ub949a-q1 to light up the screen and use it to achieve screen touch. At the beginning, the screen display is normal.

   However, after about 10 minutes of normal display, the screen signal will automatically disconnect.

   At this time, when the 949 register is read again, no register can be read. You must restart 949 to read the value of the register again.

   This is the normal 949 register

Fullscreen
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
0x00 -> 0x18
0x01 -> 0x00
0x02 -> 0x00
0x03 -> 0xda
0x04 -> 0xa0
0x05 -> 0x00
0x06 -> 0x58
0x07 -> 0x60
0x08 -> 0x62
0x09 -> 0x00
0x0a -> 0x00
0x0b -> 0x00
0x0c -> 0x05
0x0d -> 0x20
0x0e -> 0x00
0x0f -> 0x00
0x10 -> 0x00
0x11 -> 0x00
0x12 -> 0x00
0x13 -> 0x88
0x14 -> 0x00
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

2. I hope ti can help me find out whether the register configuration is wrong, or some switches in 949 have errors.

3. Because my touch is not achieved through interruption, but through circulation, I may need to read screen registers frequently through 949. Want to know if this will affect 949?

Best Regards,

Xinyu

  • 0
    Prodigy 115 points

    This is the normal 948 register

    Fullscreen
    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    0x00 -> 0x58
    0x01 -> 0x04
    0x02 -> 0x00
    0x03 -> 0x78
    0x04 -> 0xfe
    0x05 -> 0x9e
    0x06 -> 0x00
    0x07 -> 0x18
    0x08 -> 0x00
    0x09 -> 0x00
    0x0a -> 0x00
    0x0b -> 0x00
    0x0c -> 0x00
    0x0d -> 0x00
    0x0e -> 0x00
    0x0f -> 0x00
    0x10 -> 0x00
    0x11 -> 0x00
    0x12 -> 0x00
    0x13 -> 0x00
    0x14 -> 0x00
    XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

  • 0 in reply to xinyu wu
    TI__Mastermind 18046 points

    Hi Xinyu, 

    I will need some time to look into this. Due to US Holidays, responses may be delayed through Jan 3. 

    Do you have more information you can share? Are you using a custom PCB on the 948 side with the display? Any picture of the set up to share? Is the 949 an EVM and did you try the patgen function on the 949 to light up the screen or is the video coming from a different source? 

    Please provide as many details as you can so we can help with figuring out the issue. 

    Best,

    Shu