• State Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 1 answer
  • Subscribers 36 subscribers
  • Views 362 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DS90UB953-Q1: register setting for clock out

Henry Wang3
Genius 3345 points
Part Number: DS90UB953-Q1

Hi Sir,

The customer has a question about the register setting for CLKOUT_CTRL0 and CLKOUT_CTRL1.
The OSC provides the clock frequency 25MHz to DS90UB953, if the DS90UB953 CLK_OUT also can provide a clock output frequency 25MHz to the CMOS sensor, what are the values for CLKOUT_CTRL0 and CLKOUT_CTRL1?

  • +1
    TI__Mastermind 26640 points

    Hello,

    Thank you for your question. The CLK_OUT frequency is dependent on the settings of registers CLKOUT_CTRL0, CLKOUT_CTRL1, and the forward channel rate the device is operating at. For more details on this calculation, please see section 7.4.1.5 of the datasheet. Since a 25MHz oscillator is being used in Non-synchronous External clock mode, the forward channel will be operating at 2Gbps, which means to output a 25MHz CLK_OUT set the registers so 0x06 = 0x21 and 0x07 = 0x28, which corresponds to a HS_CLK_DIV of 2, an M of 1, and a N of 40.

    Regards,
    Darrah

  • 0 in reply to Darrah Merillat
    Prodigy 20 points

    您好：我有一个问题，当TI953向传感器输出25MHZ时钟时，分辨率无法达到1920 * 1536（1920 * 1423），帧速率为30FPS/秒。当TI953输出时钟到传感器为12.5MHZ时，分辨率达到1920*1536，帧速率为15FPS/秒。如何在 30*1920*1536 分辨率力下将输出更改为 <>FPS/秒

  • 0 in reply to jianan.yao
    Prodigy 20 points

    Hello: I have a problem that when the TI953 outputs a 25MHZ clock to the sensor, the resolution cannot reach 1920*1536(1920*1423) with a frame rate of 30FPS/sec. When the TI953 output clock is 12.5MHZ to the sensor, the resolution reaches 1920*1536 and the frame rate is 15FPS/sec. How do I change the output to 30FPS/sec at 1920*1536 resolution force

  • 0 in reply to jianan.yao
    TI__Mastermind 26640 points

    Hello,

    The 953 device can be programmed to output different clocks for the sensor to use, but the 953 does not program the output of the sensor directly. There may be a relationship between the received clock frequency and the resolution the sensor can achieve, but this would be sensor specific. For details on how to program your sensor, it is recommended to contact the sensor vendor directly as they will have more knowledge on the particular sensor being used and its operation.