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TDC1000: Ultrasound liquid analysis

Prodigy 140 points

Replies: 4

Views: 82

Part Number: TDC1000

Hi,

I am designing a circuit for ultrasound liquid analysis. I have tested a bit on the TDC1000-TDC7200EVM and it looks promising. Now I want to design this on my own PCB. The MCU has a 8MHz oscillator which it shares with TDC1000 and TDC7200 ("8MHZ_clock"). I don't have a voltage divider between TDC1000 VDD and VCOM as the evaluation board has. Should I have that? TDC1000 and TDC7200 also share the same SPI.

Please evaluate my attached design.

Thanks!

TDC1000.pdf

  • I am glad to hear that the EVM has produced good results and you like to move forward to design. SPI can be shared amongst TDC1000 and the TDC7200. If the micro can support dual SPI for simultaneous reading of TDC1000 and TDC7200 you could split the SPI. Its recommended that you connect a voltage divider on the VCOM pin primarily because the output of the VCOM is an analog buffer at providing a resistor divider to VCOm helps ensure faster bring up of the VCOM internally. I highly recommend to use 10Meg voltage divider circuits as shown in the EVM. 

    Thanks,

    Arjun

    What are you sensing today ?

    Hall Effect Sensing FAQ  Inductive Sensing FAQ Ultrasonic Sensing FAQ

    "TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs."

  • In reply to Arjun_Prakash:

    Hi Arjun,

    Thanks for the feedback. Then I will apply the 10M voltage divider between VDD and VCOM.

    Does the rest of the schematics look good to you?

    Regards,

  • In reply to Lars Roger Solem:

    Hello,

    The schematics looks good. Its inline with our recommended EVM schematics. 

    Thanks.

    Thanks,

    Arjun

    What are you sensing today ?

    Hall Effect Sensing FAQ  Inductive Sensing FAQ Ultrasonic Sensing FAQ

    "TI makes no warranties and assumes no liability for applications assistance or customer product design. You are fully responsible for all design decisions and engineering with regard to your products, including decisions relating to application of TI products. By providing technical information, TI does not intend to offer or provide engineering services or advice concerning your designs."

  • In reply to Arjun_Prakash:

    Thanks!

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