Inductive sensing 32-position encoder knob reference design using the LDC0851

An inductive sensing based incremental encoder knob design can provide a robust and low-cost interface for control inputs.  It can reliably operate in environments which have dirt, moisture, or oil which would pose issues for alternate sensing technologies. This solution requires no magnets.

Features:

• High reliability, contactless, encoder implementation suitable for dirty, wet, and other challenging environments
• Scalable to support multiples of 4 positions/rotation
• Minimal MCU requirements
• No permanent magnets required; operates effectively even with magnetic or electrical environmental interference

Parts Include:

LDC0851              Differentially Compensated and Highly Accurate Inductive Switch 

LP5951                 Micropower 150mA Low-Dropout (LDO) CMOS Voltage Regulator 

MSP430F5500      Mixed Signal Microcontroller 

TPD2E001            Low-Capacitance 2-Channel +/-15kV ESD Protection Array for High-Speed Data Interfaces 

Learn more by downloading the reference design below