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PGA460: Questions abut the solution

Richard Yang1
Intellectual 1220 points
Part Number: PGA460
Other Parts Discussed in Thread: ENERGIA

Hi:

   Customer is now considering to add the function of Ultrasonic Distance Sensor on their products, they are currently evaluating the solution of PGA460, they lists some questions below and need our comments:

spec: Ultrasonic Motion detection at 15’-20’(3.8m~5.0m) range, with >140-degree FOV

Questions :

1, as for the driver type(direct driver and transformer driver), can you elaborate the difference between their power design circuit respectively? did these two types have some variation regarding the ability of product detection(distance and FOV)?

2: did TI have the success case of supporting the Uart interface control? so how about the firmware's porting,  is it complicate?

3: so what kind of support related can TI support as for  the firmware and hardware ?

4, as for this design spec, which solution is the best if considering the design difficulty and design / test schedule ?

  • 0
    TI__Mastermind 27950 points
    Hi Richard,
    Responding to your questions:

    1) The driver type is usually dependent on the transducer type. Closed-top transducers typically require a transformer driver, while an open-top transducer typically requires a direct driver. This is mainly because of the closed-tops require 100Vpp while open-tops require 20Vpps. Closed-tops should be used for outdoor applications, while open-tops can be used for indoor applications. Refer to the PGA460 Ultrasonic Module Hardware and Software Optimization app note ( www.ti.com/.../slaa732 ) for more details on the differences.

    2) Yes, the PGA460's UART protocol has been fully validated up to 115.2kBaud. The USART (SPI) protocol is also available up to 8MHz. For MCU firmware details, refer to the PGA460 Software Development Guide ( www.ti.com/.../technicaldocuments ) and PGA460 Energia Library and Code Example ( www.ti.com/.../toolssoftware ).

    3) Software example were provided in answer #2. Hardware examples are available in the Design Files section of the product page here: www.ti.com/.../technicaldocuments

    4) Design difficulty is mitigated when using a closed-top transformer driven solution in UART mode. A closed top transformer is more likely to meet min and max range requirements and withstand any environmental conditions. However, the cost of a closed-top transducer is more than an open-top.