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PGA460PSM-EVM: Need EVM 3D drawing model

Paul Yeh
Genius 16185 points
Part Number: PGA460PSM-EVM
Other Parts Discussed in Thread: PGA460

Hi

The customer ask for PGA460PSM-EVM 3D drawing file. Could you provide to us.

Thanks

  • 0
    TI__Mastermind 27950 points

    Hi Paul,

    Attached is the 3D STEP file for the PGA460PSM-EVM: https://e2e.ti.com/cfs-file/__key/communityserver-discussions-components-files/1023/SENS040A_5F00_PCB.step

  • 0 in reply to Akeem Whitehead
    TI__Genius 16185 points

    Akeem,

    Thanks and one more questions in below.

    Thanks

  • 0 in reply to Paul Yeh
    TI__Mastermind 27950 points

    Hi Paul,

    TI does not have a document explaining the design rules of the mechanical enclosure/housing for an ultrasonic sensor. The customer should contact the transducer supplier for suggestions and guidelines on the mechanical housing.

    In general, the transducer should not make direct contact with the housing because this will impede and distort the vibrating mechanism. Typically, a flexible rubber gasket ring is placed around the side wall of the transducer to allow for a sealed contact with the housing. The rubber ring is flexible enough to allow the transducer to vibrate and prevent water/dust from entering to into the enclosure.

  • 0 in reply to Akeem Whitehead
    TI__Intellectual 2320 points

    Hi Akeem,

     customer application, we use on carry robot.

    But for demo environment, we have many other different carry robot.

    Therefore we worry about interference between different carry robot.

    Please feedback us below question :

    1.Please tell us how to avoid ultrasound interference between different carry robot.

     Does it could avoid by adjust software parameter or adjust some hardware design ?  

    2.What signal or light source which will interference ultrasound module ?

     Appreciated for your comments?

  • 0 in reply to Alan Chang
    TI__Mastermind 27950 points

    Hi Alan,

    Responding to your questions.

    1. The PGA460 does not offer echo signal encryption, so there is no method of distinguishing Robot-A's echo from Robot-B's echo. The best systematic option is to randomize the timing between time-of-flight measurements, and rely on averaging to remove randomly captured echoes in time for single measurements. For example, if the real object is 12ms in distance, but another robot is randomly bursting also, then out of 10 measurements, all ten should show 12ms, but maybe one or two show a non-12ms value in addition. The non-12ms values could be programmatically ignored by the master controller. For example, if the maximum time between time of flight measurements is 100ms, and only 20ms max is required, 80% of each interval time is spent inactive, allowing other robots to burst. Randomizing when the 20ms measurement starts within each 100ms interval will further help to avoid interference.

    2. Only other in-band ultrasonic emitters (such as room occupancy sensors) tend to show significant interference to the ultrasonic echo. Other noise sources include motor switching noise. Some CFL light's electronic ballasts can also act as emitters in the 40~60kHz window.