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LDC0851

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Differential inductive switch for MCU-less applications

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Data sheet

LDC0851

ACTIVE
Data sheet Order now

Product details

Applications Encoders/event counters, Metal proximity detection Number of input channels 1 Rating Catalog Vs (max) (V) 3.46 Vs (min) (V) 1.71 Operating temperature range (°C) -40 to 125
Applications Encoders/event counters, Metal proximity detection Number of input channels 1 Rating Catalog Vs (max) (V) 3.46 Vs (min) (V) 1.71 Operating temperature range (°C) -40 to 125
WSON (DSG) 8 4 mm² 2 x 2
  • Functional Safety-Capable
  • Threshold tolerance: <1 % of coil diameter
  • Temperature stable switching operation
  • Average supply current: < 20µA at 10sps
  • Shutdown supply current: 140nA
  • Push-pull output
  • Resistor programmable threshold
  • Insensitive to DC magnetic fields
  • Contactless switching operation
  • Sample rate up to 4ksps
  • Supply voltage: 1.8V – 3.3V
  • Operating temperature range: –40 to 125 °C
  • Functional Safety-Capable
  • Threshold tolerance: <1 % of coil diameter
  • Temperature stable switching operation
  • Average supply current: < 20µA at 10sps
  • Shutdown supply current: 140nA
  • Push-pull output
  • Resistor programmable threshold
  • Insensitive to DC magnetic fields
  • Contactless switching operation
  • Sample rate up to 4ksps
  • Supply voltage: 1.8V – 3.3V
  • Operating temperature range: –40 to 125 °C

The LDC0851 is a close range inductive switch ideal for contactless, simple switch applications such as presence detection and event counting.

The switch is triggered when a conductive object comes within close proximity of the sensing coil. Hysteresis is included to ensure a reliable switching threshold. The differential implementation prevents false triggering over environmental factors such as temperature variation or humidity effects. The LDC0851 does not require an MCU to operate, allowing for a simplistic solution.

Inductive sensing technology provides reliable and accurate sensing even in the presence of dirt, oil, or moisture making it ideal for use in harsh or dirty environments. The solid state switching eliminates the failures due to reed, mechanical, or contact switching. Unlike competitive products, the LDC0851 does not require magnets, nor is it affected by DC magnetic fields.

The LDC0851 is a close range inductive switch ideal for contactless, simple switch applications such as presence detection and event counting.

The switch is triggered when a conductive object comes within close proximity of the sensing coil. Hysteresis is included to ensure a reliable switching threshold. The differential implementation prevents false triggering over environmental factors such as temperature variation or humidity effects. The LDC0851 does not require an MCU to operate, allowing for a simplistic solution.

Inductive sensing technology provides reliable and accurate sensing even in the presence of dirt, oil, or moisture making it ideal for use in harsh or dirty environments. The solid state switching eliminates the failures due to reed, mechanical, or contact switching. Unlike competitive products, the LDC0851 does not require magnets, nor is it affected by DC magnetic fields.
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Technical documentation

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Type Title Date
* Data sheet LDC0851 Differential Inductive Switch datasheet (Rev. B) PDF | HTML 16 Apr 2024
Functional safety information LDC0851 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA (Rev. A) PDF | HTML 16 Apr 2024
Application note Common Inductive and Capacitive Sensing Applications (Rev. B) PDF | HTML 22 Jun 2021
Application note Simulate Inductive Sensors Using FEMM (Finite Element Method Magnetics) (Rev. A) PDF | HTML 16 Jun 2021
Application note LDC Device Selection Guide (Rev. D) PDF | HTML 15 Jun 2021
Application note Sensor Design for Inductive Sensing Applications Using LDC (Rev. C) PDF | HTML 21 May 2021
Application note LDC Target Design (Rev. B) PDF | HTML 13 May 2021
Application note LDC0851 Quick-Start Guide (Rev. A) 07 Feb 2020
Technical article Understanding tamper detection sensors PDF | HTML 18 Nov 2019
Technical article An open-and-shut case, part 2: advantages of inductive-based case tamper detection PDF | HTML 29 Nov 2018
Technical article An open-and-shut case, part 1: limitations of mechanical case tamper detection in PDF | HTML 15 Nov 2018
Application note LDC0851 Stacked Coil Design Considerations 12 Feb 2018
Application note EMI Considerations for Inductive Sensing 22 Feb 2017
Technical article Inductive sensing: reliably detect faults in circuit breakers using contactless in PDF | HTML 17 Jan 2017
Application note LDC0851 - Troubleshooting 03 Jan 2017
Technical article Inductive sensing: make your proximity-switch applications as easy as 1, 2, 3 with PDF | HTML 13 Dec 2016
Technical article How you can use the LDC racetrack inductor designer tool PDF | HTML 29 Nov 2016
Technical article How to use the LDC calculations tool PDF | HTML 10 Nov 2016
Technical article Inductive sensing: WEBENCH® Coil Designer now designs stacked coils for switch app PDF | HTML 17 Aug 2016
Technical article Inductive sensing: How can an inductive switch be used for lid open/close detectio PDF | HTML 15 Aug 2016
Technical article Inductive sensing: prototype side-by-side coils in four easy steps PDF | HTML 25 Jul 2016
Technical article Inductive sensing: Switch applications made simple PDF | HTML 11 May 2016
Technical article Inductive sensing: target size matters PDF | HTML 16 Nov 2015

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LDC0851EVM — LDC0851EVM - High Accuracy Inductive Switch with Stacked Coils Evaluation Module

The LDC0851 evaluation module demonstrates inductive sensing technology to accurately detect the presence of a conductive target passing a fixed threshold. The evaluation module includes a perforated and interchangeable 4-layer PCB where both the sensing coil and reference coil are stacted for (...)

User guide: PDF
Not available on TI.com
Simulation model

LDC0851 IBIS Model

SLYM096.ZIP (29 KB) - IBIS Model
Download
Calculation tool

LDC-CALCULATOR-TOOLS — Inductive Sensing Design Calculator Tool

The inductive sensing calculator tools provide two Excel spreadsheets to assist in the design process for inductive-to-digital converter (LDC) devices. These tools provide coil design assistance as well as some device-specific configurations.

Supported products & hardware

Supported products & hardware

Products
Inductive sensor AFEs
  • LDC0851 — Differential inductive switch for MCU-less applications
  • LDC1041 — 1-Ch, 5V, 24-bit L, 8-bit Rp, inductance to digital converter
  • LDC1051 — 1-Ch, 5V, 8-bit Rp, inductance to digital converter
  • LDC1101 — 1-Ch, 1.8V, 24-bit L, 16-bit Rp, inductance to digital converter for high speed applications
  • LDC1312 — 2-Ch, 12-bit, general purpose inductance to digital converter
  • LDC1312-Q1 — 2-Ch, 12-bit, general purpose automotive inductance to digital converter
  • LDC1314 — 4-Ch, 12-bit, general purpose inductance to digital converter
  • LDC1314-Q1 — 4-Ch, 12-bit, general purpose automotive inductance to digital converter
  • LDC1612 — 2-Ch, 28-bit, high-resolution Inductance to digital converter
  • LDC1612-Q1 — 2-Ch, 28-bit, high-resolution automotive inductance to digital converter
  • LDC1614 — 4-Ch, 28-bit, high-resolution Inductance to digital converter
  • LDC1614-Q1 — 4-Ch, 28-bit, high-resolution automotive inductance to digital converter
  • LDC2112 — 2-Ch inductance to digital converter with baseline tracking for low power touch buttons
  • LDC2114 — 4-Ch inductance to digital converter with baseline tracking for low power touch buttons
  • LDC3114 — 4-channel inductance-to-digital converter for low-power proximity and touch-button sensing
  • LDC3114-Q1 — Automotive 4-channel inductance-to-digital converter for low-power proximity & touch-button sensing
Hardware development
Evaluation board
  • LDC0851EVM — LDC0851EVM - High Accuracy Inductive Switch with Stacked Coils Evaluation Module
  • LDC1614EVM — LDC1614 Evaluation Module for Inductance to Digital Converter with Sample PCB Coils
Download
Reference designs

TIDA-01377 — Case Tamper Detection Reference Design Using Inductive Sensing

The physical case surrounding a smart meter is the first line of defense against tampering. Smart meter designs must incorporate some way to detect when the meter case is opened in order to alert service providers to a possible tamper attack.  This reference design implements a new method for (...)
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00828 — 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.
Design guide: PDF
Schematic: PDF
Reference designs

TIDA-00851-LDC0851 — LDC0851 Event Counting Reference Design

An inductive sensing (LDC)-based event counting design providing a robust and low-cost interface for speed measurement and event counting applications.  The solution doesn't require magnets and reliably operates in environments with dirt, moisture or oil that usually pose challenges for (...)
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
WSON (DSG) 8 Ultra Librarian
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