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PGA970: PGA970EVM and PGA970 chip related issues

Gang Chen
Prodigy 60 points
Part Number: PGA970
Other Parts Discussed in Thread: USB2ANY,

1)I use STM32F103 to send and read data through SPI.

This is a record of the data.

 

970_Power

01,80,00 => 05,00,00

01,80,00 => 05,00,00

4C,C0,00 => 05,00,00

4C,C0,00 => 05,00,00

970_SPI

40,C0,00 => 05,00,00

40,C0,00 => 05,00,00

01,90,30 => 05,00,00

01,90,30 => 05,00,00

40,D0,00 => 05,00,00

40,D0,10 => 05,00,00

01,80,00 => 05,00,00

01,80,00 => 05,03,00

970_Vref_en

4A,10,00 => 05,03,00

4A,10,40 => 05,03,00

970_sigma delta

4A,10,00 => 05,03,00

 4A,10,40 => 05,03,00

 44,90,20 => 05,03,00

 44,90,00 => 05,03,00

 44,10,10 => 05,03,00

 4C,F0,20 => 05,03,00

 44,90,80 => 05,03,00

 45,30,40 => 05,03,00

 47,98,20 => 05,03,00

 47,98,20 => 05,03,00

970_center freq

53,10,00 => 05,03,00

53,30,00 => 05,03,00

53,50,00 => 05,03,00

53,90,00 => 05,03,00

53,B0,00 => 05,03,00

53,D0,00 => 05,03,00

54,10,00 => 05,03,00

54,30,00 => 05,03,00

54,50,00 => 05,03,00

2)

When USB2ANY is removed, all other configurations remain unchanged.

The data was different from the previous comparison. The data collected the second time was not consistent with my expectation, but I could not find the problem

 

This is a record of the data.

 

970_Power

01,80,00 => 05,00,00

01,80,00 => 05,00,00

4C,C0,00 => 05,00,00

4C,C0,00 => 05,00,00

970_SPI

40,C0,00 => 05,00,00

40,C0,00 => 05,00,00

01,90,30 => 05,00,00

01,90,30 => 05,00,00

40,D0,00 => 05,00,00

40,D0,10 => 05,00,00

01,80,00 => 05,00,00

01,80,00 => 05,03,00

970_Vref_en

4A,10,00 => 05,03,00

4A,10,40 => 05,03,00

970_sigma delta

4A,10,00 => 05,03,00

4A,10,40 => 05,03,00

44,90,20 => 05,03,00

44,90,00 => 05,03,00

44,10,10 => 05,03,00

4C,F0,20 => 05,03,00

44,90,80 => 05,03,00

45,30,40 => 05,22,81

47,98,20 => 45,00,04

47,98,20 => 05,00,04

970_center freq

53,10,00 => 05,22,80

53,30,00 => 45,22,CA

53,50,00 => 45,22,CA

53,90,00 => 45,00,00

53,B0,00 => 05,00,00

53,D0,00 => 05,00,00

54,10,00 => 05,00,00

54,30,00 => 05,00,00

54,50,00 => 05,00,00

3)

In the third test, there was no change except that the test board of PGA970 was changed, but the data collected was completely inconsistent with expectations. This phenomenon puzzles me.

This is a record of the data.

 

 970_Power

 01,80,00 => 00,40,00

 01,80,00 => 00,40,00

 4C,C0,00 => 00,00,00

 4C,C0,00 => 00,00,00

 970_SPI

 40,C0,00 => 00,00,00

 40,C0,00 => 00,00,00

 01,90,30 => 00,40,00

 01,90,30 => 00,40,00

 40,D0,00 => 00,00,00

 40,D0,10 => 00,00,00

 01,80,00 => 00,40,00

 01,80,00 => 00,40,00

 970_Vref_en

 4A,10,00 => 04,00,00

 4A,10,40 => 04,00,00

 970_sigma delta

 4A,10,00 => 04,00,00

 4A,10,40 => 04,00,00

 44,90,20 => 00,40,10

 44,90,00 => 00,40,00

 44,10,10 => 00,00,00

 4C,F0,20 => 00,00,10

 44,90,80 => 00,40,40

 45,30,40 => 00,00,00

 47,98,20 => 00,44,10

 47,98,20 => 00,44,10


  • 0
    TI__Mastermind 31655 points

    Hi Gang,

    Can you please include the expected data for each of the transactions that you have shared? Can you also please include an oscilloscope capture of the MOSI, MISO, SCLK, and CSN lines in each of the test setups? Ideally in the cases where you are receiving unexpected data.


    Thank you,

    Scott

  • 0 in reply to Scott Cummins
    Prodigy 60 points

    1)The waveforms of MOSI, MISO, SCLK, and CSN are being tested. We will give you a reply after the test is completed.

    2)I am having problems with the PGA970EVM and the PGA970EVM GUI.

    Now the range of the LVDT sensor connected to the PGA970EVM is +-110mm. I don't understand the meaning of the DEMOD_DATA register value. I speculate that DEMOD1_DATA4 is the highest bit and DEMOD1_DATA1 is the lowest bit. The combination of these four registers represents a displacement. But how can the combined hexadecimal value be compiled and converted into a displacement value? Is there a relevant explanation document.