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TX7332EVM: Application Help

Renan Santos Adriano
Genius 17835 points
Part Number: TX7332EVM
Other Parts Discussed in Thread: TX7332,

Hello Team,

Posting on behalf for customer:

I'm using a TX7332 board, but some issues arises please help on the ff inquiry:

(1) How to trigger externally the tx7332 board for data acquisition process, is there any pin used for external triggering in tx7332 pulser board?which pin of tx7332 has to send trigger pulse, which in turn pulsate the tx-rx switch for receiving signal?

(2) During hardware setting, it generates a two cycle pulsed signal at tx pin of tx7332evm by default. how to generate a single pulse instead of two.?

Regards,

Renan

  • 0
    TI__Expert 4451 points

    Hi,

    1) To feed trigger pulser externally, you can do below modification.

    • A board change to generate the same signal externally

    –Remove the resistors R137 and R140

    –Connect a 0ohm resistor at the place holder for R142

    • This will configure the device SYNC in CMOS mode

    –Feed the input CMOS signal directly at the pad of the resistor R137 which is going to the device

    –In this configuration, we cannot generate the TR_EN signal dynamically in the required manner. Hence, we will have to keep the device LDOs and clock buffers in always on state. This will contribute to higher power dissipation in the device.

    2) Open GUI and go to pattern configuration tap. By changing setting on that page you can update the pattern. Details are also available on user guide on how to change the pattern.

    Regards,

    Shabbir

  • 0 in reply to Shabbir Amjhera Wala
    TI__Genius 17835 points

    Hello Sabbir,

    Good day. Please see response from my customer below:

    Using tx7332EVM GUI, i was trying to generate a single pulse at 1khz or less than that with a repetition rate of 1ms or in microseconds, in B mode. But i am failed. as it is fixed for 1mhz (3 pulse) and 5 mhz (5 pulse). As per ur suggestion, u told to change setting in pattern configuration tap, but which parameter, i need to change and how much. Can u please clearly explain on this.

    Regards,

    Renan

  • 0 in reply to Renan Santos Adriano
    TI__Expert 4451 points

    Hi,

    I have assigned it to my colleague and he will get back by tomorrow.

    Thanks!

  • 0 in reply to Renan Santos Adriano
    TI__Intellectual 1060 points

    Hi,

    I am not sure if I followed the question correctly. Do you want to generate a 1kHz pulse at the output or a 1MHz pulse at the output? 

    To generate a 1MHz single cycle signal at the output, you have to keep the Repeat_Count = 0 in the Pattern Profile tab under Profile Configuration, after selecting the 1MHz, 3 pulses case in the first page. 

    Generating 1kHz is slightly tricky. Currently, the device is running with a BF_CLK frequency of 200MHz. The frequency can be reduced by writing CLK_DIV = 5. This will reduce the clock to 200/32 = 6.25MHz (160ns). The maximum number of transitions possible are 16, which gives a maximum of 8 transitions per level. The period can be set to an utmost of 30, which gives 32 clocks per period. In this case, we can get a maximum level duration of 32*8*160ns = 40960ns. This will be around 12kHz. If you want to reduce the frequency to an even lower number, then an external clock has to be given to the device. This requires a board modification. 

    - Remove R19 and R20 resistors.

    - Connect R17 and R23 resistors.

    - Feed the clock at J3

    Using the above, you should be able to get a low frequency output., if you feed in a clock of 10MHz and use the maximum CLK_DIV factor of 5.

    Regards

    Savyan