Capacitive sensing with grounded capacitor sensors is a very low-power, low-cost,
high-resolution contact-less sensing technique that can be applied to a variety of applications
ranging from proximity sensing and gesture recognition to material analysis and remote liquid level
sensing. The sensor in a capacitive sensing system is any metal or conductor, allowing for low cost
and highly flexible system design.
The FDC1004 is a high-resolution, 4-channel capacitance-to-digital converter for
implementing capacitive sensing solutions. Each channel has a full scale range of ±15 pF and can
handle a sensor offset capacitance of up to 100 pF, which can be either programmed internally or
can be an external capacitor for tracking environmental changes over time and temperature. The
large offset capacitance capability allows for the use of remote sensors.
The FDC1004 also includes shield drivers for sensor shields, which can reduce EMI
interference and help focus the sensing direction of a capacitive sensor. The small footprint of
the FDC1004 allows for use in space-constrained applications. The FDC1004 is available in a 10-pin
WSON and VSSOP package and features an I2C interface for interfacing to