EVM430-FR6047: What is the transducer drive voltage?

Hi Anthony,

Anthony Davidson said:

The ultrasonic transducers are connected directly to the MPS430FR6047 microcontroller. What is the drive voltage to the transducer? I'm guessing it will be the supply voltage to microcontroller, but I haven't found confirmation of this in any documentation yet.

See this thread, the PVCC voltage is the source: https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1091776/msp430fr6047-voltage-on-uups-that-drives-sensors---can-t-find-on-data-sheet

Anthony Davidson said:

Also, Jiakang, a supply of transducers, said that for metal pipes a higher drive voltage might be required for metal pipes. I assume they meant higher than the 3.3 Vpp or 5 Vpp that is the typical recommendation. If I need to drive a higher voltage to the transducer, is there any guidance on how to do this?

Regarding driving at higher voltages, you may want to see this thread: https://e2e.ti.com/support/microcontrollers/msp-low-power-microcontrollers-group/msp430/f/msp-low-power-microcontroller-forum/1111257/msp430fr6047-external-amplifier-to-increase-the-drive-voltage-and-amplify-received-signal/4119095

The reference design that thread points to, TIDA-01486, shows how this can be done for up to 12V. 

Best Regards,
Brandon Fisher