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ADS7952-Q1: ADS7952

Joginder Yadav1
Prodigy 75 points
Part Number: ADS7952-Q1

Hi,

I am using ADS7952 in manual programming mode, with analog and digital supply of 5V and separate AGND and DGND connected at one point, Vref=2.5V. In manual mode, I am not able to select range 2 (0- 2*Vref), 2.5V input to CH0 reads 4095 instead of ~2045.

I am writing SDI=0x1840 to select CH0 and range 2. Here is a code snippet.

sdata=0x1840;

for(;;)
   {
     
     spi_xmit(sdata); //transmiting 0x1840
     // Wait until data is received
     while(SpiaRegs.SPIFFRX.bit.RXFFST !=1) { }
     // Check against sent data
     rdata = SpiaRegs.SPIRXBUF;
   
   }

Thanks

  • 0
    TI__Mastermind 24940 points

    Hello,

    It seems you are providing the correct command code. what is the actual SDO data output, the first four bits will show what channel the output corresponds to

    Would you provide a scope shot of the digital communications? please include CS, SDO, SDI, SCLK,  for three frames, starting with the command code (0x1840) and the two frames after.

    This device has a two frame latency, meaning that the output data for the selected channel will be outputted two frames after the initial frame.