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DRV2700EVM: DRV2700EVM: Piezo Control Console crashed

Part Number: DRV2700EVM

Hi experts:

I'm trying to drive my piezo speaker with DRV2700EVM, but Piezo Control Console crashed when I click console, my PC OS is Win7.

if I use analog input by an external signal, just connect JP7,JP8,JP9 to PU, remove jumppers on JP5,JP6, connect JP12; should I remove the filters as EVM userguide described 8.2.3?

Thank you.

BR

Joyce

  • Hi Joyce,

    Welcome to e2e.

    Can you confirm the version of Piezo Control Console you have installed? And also what are your jumper settings?

    Your jumper description is correct for external analog input signal. Regarding the filter, if you're sure that input signal is completely clean (not coming from a DAC or other possible digital noise source) and there is no DC offset in the signals, then you can keep the filter as is, and connect the analog input signals to TP7 and TP8.
    If the input signal is not as described, then you would need RC filter or AC coupling capacitors at least.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • Hi Evan:

    Thank you for reply.

    My version of Piezo control console is v1.2.9, and jumpers setting are:JP7, JP8,JP9 to MSP, JP5,JP6 connected, JP12 connected, no I2C, no JP13, JP2,JP3,JP4 connected to get 105V boost.

    BR

    Joyce                    

  • Joyce,

    When you connect the EVM and have PCC open, is the board recognized by the SW? Are you able to see the same as below?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • hi Ivan:

    1. Yes, I can see the board recognized as picture, but when I click console, the Console crashed.

    2. And about the pure analog input, I tried input TP7,TP8 with sine wave, 200Hz,@1.5vrms, jumppers setting are:  connect JP7,JP8,JP9 to PU, remove jumppers on JP5,JP6, connect JP12, connect JP2,JP3,JP4,no I2C, no JP13. the output+, output- I got was only 10V around,how can I get 105V output?

    thank you very much!

    BR

    Joyce

  • add note:my piezo capacitor is around 4.8uF 

  • Hi Ivan:

    sorry for multiple questions:

    I measure my piezo speaker capacity is around 4.8uF, and I changed another 20nF piezo since in the userguide, below 100nF is recommanded.

    and on 20nF piezo speaker, I can get 100V output, with 2Vrms input@200Hz through TP7,TP8, then my questions are:

    1. on 20nF piezo, how can I get 200V output?

    2. for 4.8uF or simular high capacity piezo, is there any setup on DRV2700EVM can achieve 200voutput? or other driver I can use to achieve 200V output?

    thank you very much.

    BR

    Joyce

  • Joyce,

    As you can see in data sheet figures 9 to 12, the higher the load capacitance the lower the bandwidth. So for 4.8uF the usable frequencies are lower than 20nF.
    Have you tried to measure the outputs without a load connected? Are you measuring the difference between OUT+ and OUT-? Each output would provide ~105V but differentially it wold be double that value.

    Regarding PCC, when you click Console with no EVM connected, does the software sill crashes?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • hi Ivan:

    I tried with no load connected, the output between OUT+ and OUT- is 105V, and when I click console with no EVM connected, the software will no response, but not crash.

    And, could you help suggest a driver which can provide around 200V output for 4.8uF or similar capacity piezo speaker?

    thank you!

    BR

    Joyce

  • Joyce,

    Below is a capture of the output waveforms on the maximum gain and boost settings, as you can see there is ~100V out of OUT+ and OUT-, but differentially (red signal) it is ~200V.

    Regarding the SW, have you tried to reinstall it or install it on a different PC?

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators