MCP9700T-E/TT - Microchip

MCP9700T-E/TT Frequently Asked Questions (FAQs)

• What is the recommended PCB layout for the MCP9700T-E/TT to ensure accurate temperature readings?
  A good PCB layout practice is to keep the sensor away from heat sources, use a solid ground plane, and minimize thermal gradients. A 4-layer PCB with a dedicated ground plane and a small footprint is recommended.
• How do I calibrate the MCP9700T-E/TT for high-accuracy temperature measurements?
  The MCP9700T-E/TT has an internal calibration, but for high-accuracy applications, external calibration can be done by comparing the sensor output with a precision temperature reference. A 2-point or 3-point calibration method can be used to improve accuracy.
• What is the recommended power-on sequence for the MCP9700T-E/TT to prevent damage or incorrect readings?
  The recommended power-on sequence is to apply VDD first, followed by VSS. This ensures that the internal voltage regulator is powered up correctly and prevents damage to the device.
• How do I handle the output voltage of the MCP9700T-E/TT, which is not ratiometric with the supply voltage?
  The output voltage of the MCP9700T-E/TT is not ratiometric with the supply voltage, so a voltage regulator or a voltage reference is recommended to ensure a stable output voltage. Additionally, a buffer amplifier can be used to condition the output signal.
• What is the maximum cable length for the MCP9700T-E/TT output signal, and how do I minimize noise and interference?
  The maximum cable length depends on the specific application, but a general guideline is to keep the cable length under 1 meter. To minimize noise and interference, use shielded cables, twisted pairs, and consider using a differential amplifier or a common-mode filter.