TIDA-00615
Inductive Sensing 32-Position Encoder Knob Reference Design using the LDC1312/LDC1314
TIDA-00615
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
- Minimum MCU requirements
- No permanent magnets required; operates effectively even with magnetic or electrical environmental interference
Industrial
- Absolute inductive encoder
- Baby warmers & incubators
- Blood pressure monitor
- CPAP machine
- Dental chairs
- Guitar amplifier & other music instrument amplifier
- Laser Stereolithography
- Massage chairs
- Motorized electronic wheel chair
- Operation tables
- Pachinko machine
- Professional audio amplifier (rack mount)
- Professional speaker systems
- Wearable fitness & activity monitor
Personal electronics
Design files & products
Design files
Download ready-to-use system files to speed your design process.
TIDUBG4.PDF (3508 K)
Reference design overview and verified performance test data
TIDRKL4.PDF (624 K)
Detailed schematic diagram for design layout and components
TIDRKL5.PDF (214 K)
Complete listing of design components, reference designators, and manufacturers/part numbers
TIDRKL6.PDF (175 K)
Detailed overview of design layout for component placement
TIDRKL8.ZIP (867 K)
Files used for 3D models or 2D drawings of IC components
TIDCBV4.ZIP (3208 K)
Design file that contains information on physical board layer of design PCB
TIDRKL7.PDF (1406 K)
PCB layer plot file used for generating PCB design layout
Products
Includes TI products in the design and potential alternatives.
Digital demultiplexers & decoders
CD74HC4511 — High Speed CMOS Logic BCD-to-7 Segment Latch/Decoder/Driver
Data sheetESD & 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
LDC1312 — 2-Ch, 12-bit, general purpose inductance to digital converter
Data sheetInductive sensor AFEs
LDC1314 — 4-Ch, 12-bit, general purpose inductance to digital converter
Data sheetLinear & low-dropout (LDO) regulators
LP5951 — 150-mA, low-IQ, low-dropout voltage regulator with enable
Data sheetMSP430 microcontrollers
MSP430F5528 — 25 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier
Data sheetStart development
Technical documentation
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| Type | Title | Date | |
|---|---|---|---|
| * | Design guide | LDC1312 Incremental Encoder Knob Design Guide | Jan. 28, 2016 |
| Application note | Incremental Rotary Encoders (Rev. B) | Dec. 02, 2021 | |
| More literature | TIDA-00615 Firmware | Mar. 02, 2016 |
Related design resources
Reference designs
REFERENCE DESIGN
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