MikroElektronika Development Kit Development of Skin Moisture/Skin Hydration Applications

Moisture click is a Click board™ that can be used to easily detect a moisture level of the skin, by simply touching the sensitive surface of the PCB. The Click board™ is equipped with the printed copper trace sensor, which is sampled by the accurate FDC2112 IC, a 12bit capacitance to digital (FDC) converter, which employs innovative noise and EMI resistant capacitance measuring techniques. This sensor allows the Click board™ to measure the skin moisture by measuring its capacitance, which changes depending on the skin moisture level (hydration state of the outer epidermis).

EMI-Resistant Architecture
Maximum Output Rates (One Active Channel):
– 13.3 ksps (FDC2112-Q1, FDC2114-Q1)
– 4.08 ksps (FDC2212-Q1, FDC2214-Q1)
Maximum Input Capacitance: 250 nF (at 10 kHz
with 1-mH inductor)
Sensor Excitation Frequency: 10 kHz to 10 MHz
Number of Channels: 2, 4
Resolution: Up to 28 bits
RMS noise: 0.3 fF at 100 sps and fSENSOR = 5MHz
Supply Voltage: 2.7 V to 3.6 V
Power Consumption: Active: 2.1 mA
Low-Power Sleep Mode: 35 μA
Shutdown: 200 nA
Interface: I2C
Temperature Range: –40°C to +125°C