This device is a miniaturised NFC tag that enables the reading of temperature from two TMP112 sensors as well as a LED that can be enabled or disabled. The NFC interface is provided by an NTAG5 NFC to I2C bridge chip.
- Target Frequency: 13.56MHz
- Target Q Factor: 50
- Chip Capacitance: 15pf
- External Capacitance: ~62pf
- Target Coil Inductance: 1.76uH
- Coil Shape: "Rectangular"
- Coil Height: 25mm
- Coil Width: 5mm
- Coil Turns: 8
- Coil Trace Width: 0.1mm
- Coil Trace Spacing: 0.1mm
- Coil Copper Thickness: 2oz
- 1 x NTAG5 (Link or Boost)
- 2 x TMP117
- 3 x Tuning Cap (C1-3)
- 3 x Smoothing Cap (C4-C6)
- 1 x Current Limiting Resistor
- 1 x IN-S124AR LED
This was designed as a demo project for a class that I ran. The design has not been tested and was made in a very short period of time. Whilst it should work, it is far from the ideal design for this sort of device.
This design was created with the PCBWay 2 layer flex PCB manufacturing specifications in mind. If you order this using the CAM files provided, you need to order with 2oz copper.