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SK-AM62A-LP: Inquiry Regarding Power Consumption for Eye Tracker Project

Lia Gomez
Prodigy 70 points
Part Number: SK-AM62A-LP

Dear E2E Community,

I hope this message finds you well. I am currently exploring the feasibility of developing an eye tracker application using SK-AM62A-LP for a project. Before delving deeper into the technical implementation, I would like to inquire about the power consumption requirements of such a project.

The project involves the active utilization of several components, including the TPU (Tensor Processing Unit), the processor, a camera, infrared LEDs, and a potential USB connection for data transfer to a computer. Specifically, the goal is to develop an eye tracker capable of moving the mouse cursor on a PC screen according to the user's gaze.

To achieve this, the project will entail two distinct phases of operation:

  1. Image Capture Phase: During this phase, the camera and infrared LEDs will be utilized to capture an image of the user's eyes and surrounding area.

  2. Processing Phase: Subsequently, the captured image will be processed using the TPU and processor to determine the user's point of gaze on the screen. The processed data will then be transmitted to the computer, possibly via a USB connection.

Given these operational requirements, I am interested in understanding whether it would be feasible to power the entire system via USB 2.0, with a maximum current draw of 900mA.

Could you please provide insights into whether SK-AM62A-LP can support such a project within the specified power constraints? Additionally, any recommendations or considerations regarding power management for this application would be greatly appreciated.

Thank you for your time and assistance. I look forward to your response and further discussions on this matter.

Best regards,

Lia Gomez

  • 0
    TI__Guru**** 169071 points

    Hi Lia,

    For most AM62A applications, it should be powered under 3.5W, so 900mA should be sufficient.

    But I am not sure if you have a typo here, The USB2.0 Spec defines the max current draw is 500mA, while USB3.0 is 900mA (but AM62A only supports USB2.0).

  • 0 in reply to Bin Liu
    Prodigy 70 points

    Hi Bin,

    Thank you for your response. I appreciate your insights regarding the power consumption of the AM62A board under different applications. However, my main concern is whether it's feasible to power the entire board, including all its components, directly through a USB port. I understand that USB 2.0 typically has a maximum current draw of 500mA, but I'm exploring the possibility of using USB power as the sole power source for the board. Do you have any information or recommendations regarding this specific scenario? Any insights would be greatly appreciated.

    And yes, I had a typo, I meant 3.0.

    Thank you.

  • 0 in reply to Lia Gomez
    TI__Guru**** 169071 points

    Lia,

    Lia Gomez said:
    my main concern is whether it's feasible to power the entire board, including all its components, directly through a USB port.

    I don't think TI can provide the minimum current for your entire board, it is up to the board design, other ICs on the board.

    Lia Gomez said:
    I'm exploring the possibility of using USB power as the sole power source for the board.

    I am wondering how your 900mA budget is defined. If you talk about the 900mA defined in the USB3.0 Spec, I just want to point out USB type-C power supply can provide more current. For example, the SK-AM62A-LP EVM uses USB type-C power supply and it is required minimum 5V / 3A to power this EVM.