Datasheet
Copyright © 2016, Texas Instruments Incorporated
IN0A
IN0B
IN1A
IN1B
LDC1612
VDD
Core
GND
SCL
SDA
I
2
C
CLKIN
ADDR
INTB
SD
Sensor 0
GND
MCU
VDD
I
2
C
Peripheral
3.3 V
3.3 V
GPIO
GPIO
3.3 V
40 MHz
Target
Sensor 1
Target
49
LDC1612
,
LDC1614
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SNOSCY9A –DECEMBER 2014–REVISED MARCH 2018
Product Folder Links: LDC1612 LDC1614
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8.2 Typical Application
8.2.1 System Sensing Functionality
Inductive sensing provides a wide range of system advantages that no other technology can provide - contact-
less measurement, resistance to dirt/dust/water, immunity to external magnets, remote sensor positioning,
inexpensive and robust sensors, and extremely high resolution measurement of relative movement.
The LDC1612/LDC1614 can be used to sense a wide range of applications for measuring a variety of target
movement:
• Angular Measurement: refer to 1-Degree Dial Reference Design for an example implementation.
• Linear Position Sensing: details on sensor and target construction are available in LDC1612/LDC1614 Linear
Position Sensing Application Note. For absolute positioning needs, it is recommended to use a differential 2
channel construction.
• Inductive Touch-on-Metal buttons: refer to TI Applications Note Inductive Sensing Touch-On-Metal Buttons
Design Guide for system design information and 16 Button Inductive Touch Stainless Steel Keypad
Reference Design for an example system implementation.
•
8.2.2 Example Application
Example of a multi-channel implementation using the LDC1612. This example is representative of an axial
displacement application, in which the target movement is perpendicular to the plane of the coil. The second
channel can be used to sense proximity of a second target, or it can be used for environmental compensation by
connecting a reference coil.
Figure 59. Example Multi-Channel Application - LDC1612
8.2.3 Design Requirements
Design example in which Sensor 0 is used for proximity measurement and Sensor 1 is used for temperature
compensation. WEBENCH coil designer tool used to create sensor. System measurement requirements:
• Target distance = 1.0 mm
• Distance resolution = 0.2 µm
• Target diameter = 10 mm
• Target material = stainless steel (SS416)
• Number of PCB layers for the coil = 2
• The application requires 500 SPS ( T
SAMPLE
= 2.00 ms)