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OPT8241-CDK-EVM: Illumination driver board

Yun Zhang91
Prodigy 60 points

Part Number: OPT8241-CDK-EVM

Hello,

Thank you for replying my previous questions.  

We are planning to make our own illuminators and driver board, then connect with the current OPT8241 sensor board. The purpose is to use more powerful LD/LED to see the further distance objects.

Here are some questions:

1) The trigger(integration) and modulation signals are controlled by the TFC, our driver board should have two main functions: 1. response these signals; 2. output the proper power amplitude during the integration period. TFC will be responsible for triggering the driver board and control the modulation frequency, correct?  Are there adjustable through program?

2) If 1) is true, which means the driver board only drives the LD/LED when it receives the trigger(integration) signal, it then control the output power to the certain level, since the frequency is controlled by the TFC.

    So the output power from the driver board is equal to the peak power of the 3D ToF System Estimator Tool, correct?

3) Are there any technical issues we should be aware of our application?

Thanks,

Yun

  • 0
    TI__Expert 3495 points

    1) The trigger(integration) and modulation signals are controlled by the TFC, our driver board should have two main functions: 1. response these signals; 2. output the proper power amplitude during the integration period. TFC will be responsible for triggering the driver board and control the modulation frequency, correct?  Are there adjustable through program?

    >> Correct. You need to connect ILLUM_P and ILLUM_EN to your driver system.  The  ILLUM_P is the "trigger", ILLUM_EN is the enable signal asserted for the duration of integration time.  Modulation frequency is programmable.  Take a look at Session 2.6, 2.7 and 2.8 of this video series.

    2) If 1) is true, which means the driver board only drives the LD/LED when it receives the trigger(integration) signal, it then control the output power to the certain level, since the frequency is controlled by the TFC.

    >> TFC controls the switching.  Power level is controlled by the driver source and number of LD/LED.

       So the output power from the driver board is equal to the peak power of the 3D ToF System Estimator Tool, correct?

    >>  Peak power from 3D ToF System Estimator tool defines the optical power through LD/LED when trigger is ON.  To get electrical power from optical power you generally needs to multiply that number at at least 3, depending on the conversion efficiency of your illumination device.

    3) Are there any technical issues we should be aware of our application?

    >> Videos I referenced and this app note should give you the necessary info.