LDC2112 (ACTIVE)

2-Channel HMI Inductive Touch Buttons for Consumer and Low-Power Applications

 

Description

Inductive sensing technology enables touch button design for human machine interface (HMI) on a wide variety of materials such as metal, glass, plastic, and wood, by measuring small deflections of conductive targets. The sensor for an inductive touch system is a coil that can be implemented on a small PCB located behind the panel and protected from the environment. Inductive sensing solution is insensitive to humidity or non-conductive contaminants such as oil and dirt. It is able to automatically correct for any deformation in the conductive targets.

The LDC2112/LDC2114 is a multi-channel low-noise inductance to digital converter with integrated algorithms to implement inductive touch applications. The device employs an innovative LC resonator that offers high rejection of noise and interference. The LDC2112/LDC2114 can reliably detect material deflections of less than 200 nm.

The LDC2112/LDC2114 includes an ultra-low power mode intended for power on/off buttons in battery powered applications.

The LDC2112/LDC2114 is available in a 16-pin DSBGA or TSSOP package. The 0.4 mm pitch DSBGA package has a very small 1.6 × 1.6 mm nominal body size with a maximum height of 0.4 mm. The 0.65 mm pitch TSSOP package has a 5.0 × 4.4 mm nominal body size with a maximum height of 1.2 mm.

Features

  • Low Power Consumption:
    • One Button: 6 µA at 0.625 SPS
    • Two Buttons: 72 µA at 20 SPS
  • Configurable Button Scan Rates:
    • 0.625 SPS to 80 SPS
  • Force Level Measurement of Touch Buttons
  • Independent Channel Operation:
    • Two Channels for LDC2112
    • Four Channels for LDC2114
  • Integrated Algorithms to Enable:
    • Adjustable Force Threshold per Button
    • Environmental Shift Compensation
    • Simultaneous Button Press Detection
  • Supports Independent Operation without MCU
  • Robust EMI Performance:
    • Allows for CISPR 22 and CISPR 24 Compliance
  • Operating Voltage Range: 1.8 V ± 5%
  • Temperature Range: –40 °C to +85 °C
  • Interface:
    • I2C
    • Dedicated Logic Output per Channel

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Parametrics Compare all products in Inductive Touch

 
# Input Channels
Analog Supply (V) (Max)
Analog Supply (V) (Min)
Interface
Operating Temperature Range (C)
Package Group
Package Size: mm2:W x L (PKG)
Pin/Package
Rating
Sensor Frequency (Hz)
LDC2112 LDC2114
2    4   
1.8    1.8   
1.8    1.8   
GPIOs & I2C    GPIOs & I2C   
-40 to 85    -40 to 85   
DSBGA
TSSOP   
DSBGA
TSSOP   
See datasheet (DSBGA)
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)   
See datasheet (DSBGA)
16TSSOP: 32 mm2: 6.4 x 5(TSSOP)   
16DSBGA
16TSSOP   
16DSBGA
16TSSOP   
Catalog    Catalog   
1MHz to 30MHz    1MHz to 30MHz   

WEBENCH® Designer LDC2112

Coil Designer
Use this tool for building custom sensor coils with known system constraints.
Coil Shape
 
Shape
Outer Diameter  mil
Turns per Layer (N)
Layers (M)