FDC1004DGST - Texas Instruments

FDC1004DGST Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the FDC1004DGST to minimize noise and ensure accurate measurements?
  A good PCB layout for the FDC1004DGST involves keeping the analog and digital grounds separate, using a solid ground plane, and placing the device close to the capacitive sensor. Additionally, using a shielded cable and a low-pass filter can help reduce noise.
• How do I calibrate the FDC1004DGST to ensure accurate capacitance measurements?
  Calibration involves connecting a known capacitance to the sensor and adjusting the offset and gain registers to match the expected value. The device also has a built-in calibration mode that can be used to simplify the process.
• What is the maximum frequency of the clock input for the FDC1004DGST?
  The maximum frequency of the clock input for the FDC1004DGST is 2 MHz. Exceeding this frequency may result in inaccurate measurements or device malfunction.
• Can I use the FDC1004DGST with a capacitive sensor that has a different capacitance range than the recommended 1-100 pF?
  Yes, the FDC1004DGST can be used with capacitive sensors that have a different capacitance range. However, the device's gain and offset registers may need to be adjusted to accommodate the new range, and the sensor's capacitance should be within the device's measurable range of 1-400 pF.
• How do I handle the FDC1004DGST's power-on reset (POR) and brown-out reset (BOR) features?
  The POR and BOR features can be handled by adding an external reset circuit that holds the device in reset until the power supply has stabilized. This ensures that the device powers up correctly and avoids any potential issues during power-up.