SNOSCZ7A December 2015  – January 2016 LDC0851

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Simplified Schematic
  5. Revision History
  6. Pin Configuration and Functions
  7. Specifications
    1. 7.1Absolute Maximum Ratings
    2. 7.2ESD Ratings
    3. 7.3Recommended Operating Conditions
    4. 7.4Thermal Information
    5. 7.5Electrical Characteristics
    6. 7.6Interface Voltage Levels
    7. 7.7Timing Requirements
    8. 7.8Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Basic Operation Mode
      2. 8.3.2Threshold Adjust Mode
      3. 8.3.3Setting the Threshold Adjust Values
      4. 8.3.4Hysteresis
      5. 8.3.5Conversion Time
      6. 8.3.6Power-Up Conditions
    4. 8.4Device Functional Modes
      1. 8.4.1Shutdown Mode
      2. 8.4.2Active Mode
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1Sensor Design
        1. 9.1.1.1Sensor Frequency
        2. 9.1.1.2Sensor Design Procedure
    2. 9.2Typical Application
      1. 9.2.1Event Counting
        1. 9.2.1.1Design Requirements
        2. 9.2.1.2Detailed Design Procedure
        3. 9.2.1.3Application Curves
      2. 9.2.2Coarse Position Sensing
        1. 9.2.2.1Design Requirements
        2. 9.2.2.2Detailed Design Procedure
        3. 9.2.2.3Application Curves
      3. 9.2.3Low Power Operation
        1. 9.2.3.1Design Requirements
        2. 9.2.3.2Detailed Design Procedure
        3. 9.2.3.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
    2. 11.2Layout Example
      1. 11.2.1Side by Side Coils
      2. 11.2.2Stacked Coils
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Development Support
    2. 12.2Community Resources
    3. 12.3Trademarks
    4. 12.4Electrostatic Discharge Caution
    5. 12.5Glossary
  13. 13Mechanical, Packaging, and Orderable Information

1 Features

  • Threshold tolerance: <1 % of coil diameter
  • Temperature stable switching operation
  • Average Supply Current: < 20 µA @ 10 sps
  • Shutdown Supply Current: 140 nA
  • Push-pull output
  • Resistor Programmable Threshold
  • Insensitive to DC Magnetic Fields
  • Contactless Switching Operation
  • Sample Rate up to 4 ksps
  • Supply Voltage: 1.8 V – 3.3 V
  • Operating Temperature Range: -40 to 125 °C

2 Applications

  • Open/Close Switches
    • Home Security and Tamper Detection
    • Printers
    • Personal Electronics
  • Event Counting
    • Fan Speed RPM Detection
    • Rotary Encoder
    • Flow Meters
    • Incremental Knob / Dial
  • Simple Buttons
    • Industrial Keypads
    • Personal Electronics
  • Industrial Proximity Switch

3 Description

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

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 immune to mechanical vibration. The differential implementation prevents false triggering over environmental factors such as temperature variation or humidity effects.

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.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
LDC0851WSON-82mm x 2mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

4 Simplified Schematic

LDC0851 simplified_schematic_snoscz7.gif