The performance of capacitive sensors relies largely on the efficiency of the interfacing circuits. Interference is a limiting factor especially when it comes to capacitive sensors that require unshielded or partially-shielded electrodes. The existing solutions for this, use complex filtering techniques or signal processing, which add to the cost and power consumption. A capacitance-to-digital converter (CDC) that intrinsically possesses very low sensitivity to interference will be presented in this talk. Subsequently, a closed-loop capacitance-to-frequency converter (CFC) adopting an auto-balancing topology will be presented. It has the new functionality of being compatible with single-element as well as differential capacitive sensors. Its output is independent of parasitic, offset and nominal capacitance of the interfaced sensor. This circuit is intended for sensors that use dc excitation. However, sinusoidal excitation is needed for some others. To address this, an auto-balancing capacitance-to-pulse-width converter (CPC) which possesses all the good features of the CFC, but with reduced complexity has been developed. The final part of the talk will focus on measuring parameters that are not physically accessible, but accessible through capacitive coupling. This was realized using a novel, efficient, direct microcontroller interface. The details of the aforementioned measurement schemes will be presented in the talk.