TIDA-00828
Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC0851
TIDA-00828
Overview
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
Automotive
Industrial
Personal electronics
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUBG5.PDF (2281 K)
Reference design overview and verified performance test data
TIDRL08.PDF (282 K)
Detailed schematic diagram for design layout and components
TIDRL09.PDF (215 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRL10.PDF (178 K)
Detailed overview of design layout for component placement
TIDRL12.ZIP (554 K)
Files used for 3D models or 2D drawings of IC components
TIDCBZ7.ZIP (564 K)
Design file that contains information on physical board layer of design PCB
TIDRL11.PDF (1195 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
ESD & surge protection ICs
TPD2E001 — Dual 1.5-pF, 5.5-V, ±8-kV ESD protection diode with 1-nA max leakage & VCC pin for USB 2.0
Data sheetInductive sensor AFEs
LDC0851 — Differential inductive switch for MCU-less applications
Data sheetLinear & low-dropout (LDO) regulators
LP5951 — 150-mA, low-IQ, low-dropout voltage regulator with enable
Data sheetMSP430 microcontrollers
MSP430F5500 — 25 MHz MCU with 8KB Flash, 4KB SRAM, comparator, DMA, UART/SPI/I2C, USB, timer, HW multiplier
Data sheetStart development
Technical documentation
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View all 3
| Type | Title | Date | |
|---|---|---|---|
| * | Design guide | LDC0851 Incremental Rotary Encoder Design Guide | Jan. 28, 2016 |
| Application note | Incremental Rotary Encoders (Rev. B) | Dec. 02, 2021 | |
| More literature | TIDA-00828 Firmware | Mar. 30, 2016 |
Related design resources
Reference designs
REFERENCE DESIGN
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