PGA460: TX only application by using PGA460

Gary Teng

Part Number: PGA460
Other Parts Discussed in Thread: ENERGIA

Hi Sir,

My customer want to use PGA460 as ultrasonic TX source for their medical application. They can use EVM GUI and distance detection sample code (ultrasonicCmd(PGA460_USSC.cpp) to send out pause and general waveform already, but their signal need around 70ms to generate another signal (as attached pic.). Can we use PGA460 as TX only and send out waveform continually? And how to set it up on gui/code? Thanks for your kindly help.

USER_DATA1 = 0x00;
USER_DATA2 = 0x00;
USER_DATA3 = 0x00;
USER_DATA4 = 0x00;
USER_DATA5 = 0x00;
USER_DATA6 = 0x00;
USER_DATA7 = 0x00;
USER_DATA8 = 0x00;
USER_DATA9 = 0x00;
USER_DATA10 = 0x00;
USER_DATA11 = 0x00;
USER_DATA12 = 0x00;
USER_DATA13 = 0x00;
USER_DATA14 = 0x00;
USER_DATA15 = 0x00;
USER_DATA16 = 0x00;
USER_DATA17 = 0x00;
USER_DATA18 = 0x00;
USER_DATA19 = 0x00;
USER_DATA20 = 0x00;
TVGAIN0 = 0xAA;
TVGAIN1 = 0xAA;
TVGAIN2 = 0xAA;
TVGAIN3 = 0x82;
TVGAIN4 = 0x08;
TVGAIN5 = 0x20;
TVGAIN6 = 0x80;
INIT_GAIN = 0x60;
FREQUENCY = 0x8F;
DEADTIME = 0xA0;
if (comm == 2)
{
PULSE_P1 = 0x80 | 0x04;
}
else
{
PULSE_P1 = 0x04;
}
PULSE_P2 = 0x10;
CURR_LIM_P1 = 0x55;
CURR_LIM_P2 = 0x55;
REC_LENGTH = 0x19;
FREQ_DIAG = 0x33;
SAT_FDIAG_TH = 0xEE;
FVOLT_DEC = 0x7C;
DECPL_TEMP = 0x4F;
DSP_SCALE = 0x00;
TEMP_TRIM = 0x00;
P1_GAIN_CTRL = 0x09;
P2_GAIN_CTRL = 0x09;

Best regards,

Gary Teng

over 3 years ago

0 Mekre Mesganaw over 3 years ago

TI__Expert 7485 points

Hi Gary,

You cannot continuously send pulses reliably; however, you should be able to increase the percentage of time that you are sending pulses by doing the following:

Set the number of burst pulses to the maximum value of 31. This is done by setting the Px_Pulse field in the Pulse_Px register to 0x1F.
Set the Px_Rec field in the REC_LENGTH register to 0x00 so that the minimum record length time of 4.096 ms is set.
By default, the energia code example automatically adds a 70 ms delay. A value of 70 ms was selected because it is larger than 65.536 ms, which is the maximum record length that can be selected. Since you are decreasing the record length to 4.096 ms, you can reduce the 70 ms delay. I’d recommend using a delay of at least 5 or 6 ms. To adjust the delay, go to the PGA460_USSC.cpp file and modify the “70” in the line that says “delay(70)” to the selected delay in units of ms.

Regards,

Mekre

0 Gary Teng over 3 years ago in reply to Mekre Mesganaw

Genius 5830 points

Hi Mekre,

My customer modify their code and then get better delay time to 300us but customer want to short the delay time or add more pulse on a group (or has continue pulse). Is it possible to have more / continue burst pulse sent by PGA460?