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

4.2.3 LDC0851

The LDC0851 is a low-cost inductive comparator, generating an output based on the difference between a sense inductor and a reference inductor. A pair of resistors on the ADJ pin can be used to adjust the sensitivity or switching distance; no other configuration is necessary. The LDC0851 uses one capacitor for both sensors, which improves the matching of the two sensors and also reduces system cost. The LDC0851 does not have any registers and therefore does not require any MCU configuration for operation.

GUID-C6953C1D-AA09-48C8-866E-83547F4B2ABE-low.gif Figure 4-4 LDC0851 Block Diagram

The main features of this device include:

  1. Simple operation
  2. Configured by only two resistors on the ADJ pin
  3. Intrinsic temperature and system compensation
  4. Supply voltage range of 1.71 V to 3.46 V
  5. Sensor frequency range of 300 kHz to 19 MHz
  6. Small 8-pin DFN footprint

The sensor drive design of the LDC0851 makes it able to drive nearly any sensor within its design requirements (based on the sensor L and the sensor C), without needing to consider the sensor RP.