SNOSD01D May 2015  – October  2016 LDC1101

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. 7.6Digital Interface
    7. 7.7Timing Requirements
    8. 7.8Typical Characteristics
  8. Detailed Description
    1. 8.1Overview
    2. 8.2Functional Block Diagram
    3. 8.3Feature Description
      1. 8.3.1Sensor Driver
    4. 8.4Device Functional Modes
      1. 8.4.1Measurement Modes
      2. 8.4.2RP+L Measurement Mode
        1. 8.4.2.1RPMIN and RPMAX
        2. 8.4.2.2Programmable Internal Time Constants
        3. 8.4.2.3RP+L Mode Measurement Sample Rate
      3. 8.4.3High Resolution L (LHR) Measurement Mode
      4. 8.4.4Reference Count Setting
      5. 8.4.5L-Only Measurement Operation
      6. 8.4.6Minimum Sensor Frequency and Watchdog Setting
      7. 8.4.7Low Power Modes
        1. 8.4.7.1Shutdown Mode
        2. 8.4.7.2Sleep Mode
      8. 8.4.8Status Reporting
      9. 8.4.9Switch Functionality and INTB Reporting
    5. 8.5 Programming
      1. 8.5.1SPI Programming
    6. 8.6Register Maps
      1. 8.6.1 Individual Register Listings
      2. 8.6.2 Register RP_SET (address = 0x01) [reset = 0x07]
      3. 8.6.3 Register TC1 (address = 0x02) [reset = 0x90]
      4. 8.6.4 Register TC2 (address = 0x03) [reset = 0xA0]
      5. 8.6.5 Register DIG_CONF (address = 0x04) [reset = 0x03]
      6. 8.6.6 Register ALT_CONFIG (address = 0x05) [reset = 0x00]
      7. 8.6.7 Register RP_THRESH_HI_LSB (address = 0x06) [reset = 0x00]
      8. 8.6.8 Register RP_THRESH_HI_MSB (address = 0x07) [reset = 0x00]
      9. 8.6.9 Register RP_THRESH_LO_LSB (address = 0x08) [reset = 0x00]
      10. 8.6.10Register RP_THRESH_LO_MSB (address = 0x09) [reset = 0x00]
      11. 8.6.11Register INTB_MODE (address = 0x0A) [reset = 0x00]
      12. 8.6.129.Register START_CONFIG (address = 0x0B) [reset = 0x01]
      13. 8.6.13Register D_CONFIG (address = 0x0C) [reset = 0x00]
      14. 8.6.14Register L_THRESH_HI_LSB (address = 0x16) [reset = 0x00]
      15. 8.6.15Register L_THRESH_HI_MSB (address = 0x17) [reset = 0x00]
      16. 8.6.16Register L_THRESH_LO_LSB (address = 0x18) [reset = 0x00]
      17. 8.6.17Register L_THRESH_LO_MSB (address = 0x19) [reset = 0x00]
      18. 8.6.18Register STATUS (address = 0x020 [reset = 0x00]
      19. 8.6.19Register RP_DATA_LSB (address = 0x21) [reset = 0x00]
      20. 8.6.20Register RP_DATA_MSB (address = 0x22) [reset = 0x00]
      21. 8.6.21Register L_DATA_LSB (address = 0x23) [reset = 0x00]
      22. 8.6.22Register L_DATA_MSB (address = 0x24) [reset = 0x00]
      23. 8.6.23Register LHR_RCOUNT_LSB (address = 0x30) [reset = 0x00]
      24. 8.6.24Register LHR_RCOUNT_MSB (address = 0x31) [reset = 0x00]
      25. 8.6.25Register LHR_OFFSET_LSB (address = 0x32) [reset = 0x00]
      26. 8.6.26Register LHR_OFFSET_MSB (address = 0x33) [reset = 0x00]
      27. 8.6.27Register LHR_CONFIG (address = 0x34) [reset = 0x00]
      28. 8.6.28Register LHR_DATA_LSB (address = 0x38) [reset = 0x00]
      29. 8.6.29Register LHR_DATA_MID (address = 0x39) [reset = 0x00]
      30. 8.6.30Register LHR_DATA_MSB (address = 0x3A) [reset = 0x00]
      31. 8.6.31Register LHR_STATUS (address = 0x3B) [reset = 0x00]
      32. 8.6.32Register RID (address = 0x3E) [reset = 0x02]
      33. 8.6.33Register DEVICE_ID (address = 0x3F) [reset = 0xD4]
  9. Application and Implementation
    1. 9.1Application Information
      1. 9.1.1 TI Designs and Application Notes
      2. 9.1.2 Theory of Operation
      3. 9.1.3 RP+L Mode Calculations
      4. 9.1.4 LDC1101 RP Configuration
      5. 9.1.5 Setting Internal Time Constant 1
      6. 9.1.6 Setting Internal Time Constant 2
      7. 9.1.7 MIN_FREQ and Watchdog Configuration
      8. 9.1.8 RP+L Sample Rate Configuration With RESP_TIME
      9. 9.1.9 High Resolution Inductance Calculation (LHR mode)
      10. 9.1.10LHR Sample Rate Configuration With RCOUNT
      11. 9.1.11Setting RPMIN for LHR Measurements
      12. 9.1.12Sensor Input Divider
      13. 9.1.13Reference Clock Input
      14. 9.1.14INTB Reporting on SDO
      15. 9.1.15DRDY (Data Ready) Reporting on SDO
      16. 9.1.16Comparator Functionality
    2. 9.2Typical Application
      1. 9.2.1Design Requirements
      2. 9.2.2Detailed Design Procedure
        1. 9.2.2.1Device Configuration for RP+L Measurement with an Example Sensor
        2. 9.2.2.2Device Configuration for LHR Measurement with an Example Sensor
      3. 9.2.3Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1Layout Guidelines
      1. 11.1.1Ground and Power Planes
      2. 11.1.2CLKIN Routing
      3. 11.1.3Capacitor Placement
      4. 11.1.4Sensor Connections
    2. 11.2Layout Example
  12. 12Device and Documentation Support
    1. 12.1Device Support
      1. 12.1.1Development Support
    2. 12.2Documentation Support
      1. 12.2.1Related Documentation
    3. 12.3Community Resources
    4. 12.4Trademarks
    5. 12.5Electrostatic Discharge Caution
    6. 12.6Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Orderable Information

Features

  • Wide Operating Voltage Range: 1.8 V to 3.3 V
  • Sensor Frequency Range: 500 kHz to 10 MHz
  • RP Resolution: 16-Bit
  • L Resolution: 16- or 24-Bit
  • 180-kSPS Conversion Rate
  • Threshold Detection Functionality
  • 1% Part-to-Part Variation in RP Measurement
  • Supply Current:
    • 1.4-µA Shutdown mode
    • 135-µA Sleep mode
    • 1.9-mA Active Mode (no sensor connected)
  • Sub-Micron Distance Resolution Achievable
  • Remote Sensor Placement Isolating the LDC from Harsh Environments
  • Robust Against Environmental Interferences such as Oil, Water, Dirt, or Dust
  • Minimal External Components
  • Magnet-Free Operation
  • Operating Temperature: –40°C to +125°C

Applications

  • High-Speed Gear Counting
  • High-Speed Event Counting
  • Motor Speed Sensing
  • Knobs and Dials for Appliances, Automotive, and Consumer Applications
  • HMI for Appliances, Automotive, and Consumer Applications
  • Buttons and Keypads
  • Motor Control
  • Metal Detection

Description

The LDC1101 is a 1.8-V to 3.3-V, high-resolution inductance-to-digital converter for short-range, high-speed, contactless sensing of position, rotation, or motion, enabling reliable, accurate measurements even in the presence of dust or dirt, making it ideal for open or harsh environments.

The LDC1101 features dual inductive measurement cores, allowing for > 150 ksps 16-bit RP and L measurements simultaneous with a high-resolution L measurement which can sample at > 180 ksps with a resolution of up to 24 bits. The LDC1101 includes a threshold-compare function which can be dynamically updated while the device is running.

Inductive sensing technology enables precise measurement of linear/angular position, displacement, motion, compression, vibration, metal composition, and many other applications in markets including automotive, consumer, computer, industrial, medical, and communications. Inductive sensing offers better performance and reliability at lower cost than other, competing solutions.

The LDC1101 offers these benefits of inductive sensing in a small 3-mm × 3-mm 10-pin VSON package. The LDC1101 can be easily configured by a microcontroller using the 4-pin SPI™.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
LDC1101VSON (10)3.00 mm × 3.00 mm
  1. For all available packages, see the orderable addendum at the end of the data sheet.

Simplified Schematic

LDC1101 simplified_schematic_snosd01.gif