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PGA460: Recommended Settings for Murata MA58MF14-7N

Kartik Sastry
Prodigy 20 points
Part Number: PGA460
Other Parts Discussed in Thread: ENERGIA, ,

Hello, 

The "PGA460 Software Development Guide" and Energia code in "PGA460_USSC.cpp" indicate that there exist "recommended settings" for some of PGA460's EEPROM registers for the Murata MA58MF14-7N ultrasonic transducer. 

I was hoping to gain some insight into why these settings are recommended, but am unable to find further documentation. I would appreciate any insight or documentation you can provide!

Respectful Regards, 

Kartik Sastry

  • 0
    TI__Mastermind 27950 points

    Hi Kartik,

    The Murata MA58MF14-7N is an automotive grade transducer typically used in park assist applications. When the ultrasonic park assist modules are characterized, a universal target is an ISO standard pole (1m height and 7.5cm diameter, PVC material). The PGA460-Q1 is intended to be able to detect the ISO-pole up to 5m in distance. To power the PGA460-Q1 in an automotive system, a battery is usually down-regulated to a stable LDO level (i.e. 9V). Center-tap transformers with a 1:1:10 turns ratio are used to generate the peak-to-peak excitation voltage of the MA58MF14-7N's 120Vpp rating. The "recommended settings" are based on collective parameters of the customer/system level requirement, power supply, and driver type.

    Ultimately, the settings will likely be different based on you use-case, range requirement, and target type. The recommended Murata MA58MF14-7N settings have been extensively tested by TI to emulate a customer's experience using our device with this specific transducer. The PGA460-Q1 EVM GUI includes a feature on the General settings page to populate the register map with the recommend settings.

    To better understand the variable of an ultrasonic time of flight system, see the PGA460 Ultrasonic Module Hardware and Software Optimization app note for a more detailed discussion of my above commentary.

    If you can tell me what your use-case is, your range requirement, and intended targets are, I may be able to provide a recommendation for the transducer part number, driver mode, and device settings.