SNOA954D November   2019  – June 2021 LDC0851 , LDC1001 , LDC1001-Q1 , LDC1041 , LDC1051 , LDC1101 , LDC1312 , LDC1312-Q1 , LDC1314 , LDC1314-Q1 , LDC1612 , LDC1612-Q1 , LDC1614 , LDC1614-Q1 , LDC2112 , LDC2114 , LDC3114 , LDC3114-Q1

 

  1.   Trademarks
  2. 1LDC Applications
    1. 1.1 Axial Sensing
      1. 1.1.1 Buttons and Keypads
    2. 1.2 Event Counting
    3. 1.3 Other Types of Sensing
  3. 2Inductive Sensing Theory of Operation
  4. 3LDC Device Feature Overview
    1. 3.1 Sample Rate
    2. 3.2 Sensor L Measurement and Reference Frequency
    3. 3.3 Sensor RP Measurement
    4. 3.4 Sensor RP (Current) Drive Capability
    5. 3.5 Switch Output Functionality
    6. 3.6 Sensor Frequency Range
    7. 3.7 Multi-Channel Sensing
    8. 3.8 Power Management
    9. 3.9 Internal Algorithms
  5. 4Device Families
    1. 4.1 Inductive Touch Devices
      1. 4.1.1 Inductive Touch LDC Recommended Applications
    2. 4.2 Multichannel LDC Devices
      1. 4.2.1 Multi-Channel LDC Recommended Applications
      2. 4.2.2 LDC1101
        1. 4.2.2.1 LDC1101 Recommended Applications
      3. 4.2.3 LDC0851
        1. 4.2.3.1 Recommended Applications
  6. 5Summary
  7. 6Revision History

3 LDC Device Feature Overview

Determining the appropriate LDC device for a specific application is based on a few device parameters. Table 3-1 provides a comparison for the various LDC devices.

Table 3-1 Comparison of LDC Devices
LDC3114LDC2112/4LDC1312/4
LDC1612/4		LDC0851LDC1101
Supply Voltage1.71 to 1.89 V1.71 to 1.89 V2.7 to 3.6 V1.71 to 3.46 V1.71 to 3.46 V
Typical Sleep Current5 µA5 µA35 µAN/A135 µA
Typical Shutdown CurrentN/AN/A0.2 µA0.14 µA1.4 µA
Sensor Frequency Range
(wider is better)

5

MHz to 30 MHz		1 MHz to 30 MHz1 kHz to 10 MHz300 kHz to 19 MHz500 kHz to 10 MHz
Sensor Min RP
(lower is better)		350 Ω350 Ω1 kΩ/Ch0 = 250 ΩN/A1.25 kΩ
Output RP Measurement Resolution N/AN/AN/AN/A16 bits
Output L Measurement Resolution 12 bits12 bitsLDC131x: 12 bits (16 bits effective with output gain)
LDC161x: 28 bits		N/A16 bits or 24 bits
Maximum Reference Frequency
(higher is better)		N/AN/A40 MHzN/A16 MHz
Internal Reference OscillatorYesYesYesN/ANo
Number of Channels4LDC2112: 2
LDC2114: 4		LDC1312/LDC1612: 2
LDC1314/LDC1614: 4		1 (uses 2nd sensor for reference comparison)1
Maximum Sample Rate160 SPS80 SPSLDC1312/4: 13.3 kSPS
LDC1612/4: 4.1 kSPS		4 kSPS180 kSPS
Automotive VersionLDC3114-Q1N/ALDC1312-Q1
LDC1314-Q1
LDC1612-Q1
LDC1614-Q1		N/AN/A
Switch OutputYes, based on Sensor LYes, based on Sensor LNoYes, based on Sensor LYes, based on Sensor RP or L
InterfaceI2C– 400 kbit
Push-pull Output		I2C – 400 kbit
Push-pull Output		I2C – 400 kbitPush-pull OutputSPI – 8 MHz
Stand-alone operation (No MCU needed)YesYesNoYesNo