LDC1314: I°Dial&Evm of LDC1314

Hi Hasebe,

1. The 1° dial already comes with the LDC1314 and MSP430, which can be connected to the computer via usb to show the angle display.

2. The LDC1314 registers can be changed using the port commands. Refer to section 8.1 in the data sheet.

3. Shape Pre-distortion essentially makes data A and B closer to the cosine and sine functions in order to achieve more accurate measurements by using the following formulas:

A = sign(A) x abs(A)^EXP  and B = sign(B) x abs(B)^EXP

where sign is the standard sign abs, is the absolute value, and EXP is the number that affects the shape of the waveform

4. Phase Skew Correction is the last step in data processing. This is required as after magnitude calibration, phase errors could still be there due to mechanical tolerance and surrounding metals. It is done by interpolating four known skew correction points from calibration, and using the following formula:

5. For the source file, I will have to look into it and get back to you later

Thanks,

Jiashow

Hello Jiashow-san,

Thank you for your reply.

1. The 1° dial already comes with the LDC1314 and MSP430, which can be connected to the computer via usb to show the angle display.
⇒I understand it.

2. The LDC1314 registers can be changed using the port commands. Refer to section 8.1 in the data sheet.
⇒I understand it.
　However, please tell me the environment of command change.

3. Shape Pre-distortion essentially makes data A and B closer to the cosine and sine functions in order to achieve more accurate measurements by using the following formulas:
⇒I recognize that Shape Pre-distortion is not in the GUI tool of LDC 1314 EVM.
　So, I think that my customers need to program using this formula.
　Is this correct?

4. Phase Skew Correction is the last step in data processing. This is required as after magnitude calibration, phase errors could still be there due to mechanical tolerance and surrounding metals. It is done by interpolating four known skew correction points from calibration, and using the following formula:
⇒Also,I recognize that Phase Skew Correcton is not in the GUI tool of LDC 1314 EVM.
　So, I think that my customers need to program using this formula.
　Is this correct?

5. For the source file, I will have to look into it and get back to you later.
⇒I am waiting for your reply.
Also,Please provide information on development environment to create.

Best Regards,
Y,Hasebe

Hello Jiashow-san,

Thank your for your reply.

I found EVM firmware folder and PC GUI.

Also, I checked Form_Main.vb.

But I do not know where the Shape Pre-Distortion and Phase Skew Correction program is.
Please let me know it.

Best Regards,

Y.Hasebe

Hello Jiashow-san,

My customer asked us additional questions.

1.Please let me know that detailed procedure for changing the setting using the port command from the PC.

　(For example, in the case of changing angle calculation)

2.Do you know how to rewrite resister values of 1 ° dial application angle calculations and display without program development means?　

   For example, the following method etc

  ・Control by GUI  ⇒ I understand that this is impossible.

  ・Rewrite the contents of the setting file somewhere in the installation folder etc.⇒ I have recognized that it is same the above question.

3.About "EXP" of Shape Pre-distortion

  I understand that the tendency of the output data is close to a sine wave.

 Do you know how to determine the value of EXP?

4.About ENOB

 Do you have the relational formula between output gain and ENOB?

5.GUI for 1°Dial

   What does the slider at the bottom of the GUI mean? 　

   Also, please let me know how to use.

6.About 1-Degree Dial Demo GUI

  There was an Excel file named "Dial Calib.xlsx" in the "Config Files" folder of the installation folder.

  We have recognized that the angle calculation method for each calibration method is described.

  Sheet of "Dial Calib.xlsx" "DIAL - ATAN 4P"
  → Calculate angle at "4-point" in tidu 953
  Sheet of "Dial Calib.xlsx" "DIAL - 1T"
  → Calculate angle with "1-turn" or "Dyamic" in tidu 953

   Is this correct?

Best Regards,

Y.Hasebe

LDC_Dial_Calculator.xlsxHello Hasebe-san,

3) Attached is a calculator tool which can help determine the EXP value. You will need to collect output code data at multiple angles to determine the appropriate EXP value.

4) The ENOB is a function of the RCOUNT setting. Note that using the OUTPUT GAIN feature does increase the resolution, but also reduces the maximum signal amplitude. For most applications, the signal amplitude is much smaller than full scale range, and so this improves the SNR.

5) It repeats the dial as a linear output.

Regards.

ChrisO

Hello Chris-san,

Thank you for your kindly reply.

I understand your comments.

Do you know the remaining questions (No. 1, 2, 6)?

My customer wants to change parameters (change degree calculation, etc.) using 1 ° Dial's tool.

Best Regards,
Y.Hasebe

Hello Hasebe-san,

In answer to question #2: to change the device register settings, you need to use a terminal program like Termite or Realterm. Once you connect the Dial to the USB port of the computer and open up the terminal program, you can read and write the LDC1314 registers using an ASCII protocol:

To write to a Register, send:
IW_<I2C address, 2 chars Hex>_<2char hex register>_<4 char hex write data><CR><LF>

To read from a Register, send:
IR_<I2C address, 2 chars Hex>_<2char hex register><CR>

The dial responds with 4 characters corresponding to the Hex register contents. All alphabetic chars (A..Z) must be capitals, not lower-case. In the protocol above, "_" in the above is actually a space " "(ascii 0x20).

Hello Chris -san,

Thank you for your kindly reply.

I tried check by TeraTerm.

But I couldn't confirm it.

So, please let me  know about the setting shown below.

Best Regards,

Y.Hasebe