I am looking for a three phase output from a LDC0851/LDC1312/LDC1314 Inductance to Digital converter. The output should mimic Hall Effect Sensor digital output with phase shifted waveforms typically designated as H1, H2 and H3. A design for Target wheel and Sensors PCB would be appreciated.
Thanks in advance for your time.
Regards,
Hemant
Hemant,
A three phase configuration with inductive sensing is an interesting concept. I'm not aware of any existing design I can provide you as a reference for this type of solution.
A three phase output requires the sensors to be spaced 120 degrees electrically. Ideally, we would see a 50% duty cycle from each device. A few options might be worth considering for this design. It may be possible to use a target shape similar to what is shown on the left. Here we will vary the size of the target material in a fairly sinusoidal manner. If this is too unbalanced for your system, it may make more sense to use a shape similar to what is on the right. With a gear tooth pattern, we can produce alternating regions for the sensors to detect. The number of teeth will impact the resulting output frequency from the three devices. For instance a tooth size of 60 degrees will result in a 3x increase in output frequency.
