LDC2112_17 Datasheet, PDF (1/52 Pages) Texas Instruments – Inductive Touch Solution for Low-Power HMI Button Applications

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LDC2112, LDC2114
SNOSD15B – DECEMBER 2016 – REVISED APRIL 2017
LDC2112, LDC2114 Inductive Touch Solution for Low-Power HMI Button Applications
1 Features
•1 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
2 Applications
Touch Buttons and Force Level Measurements on
Different Materials, Including Metal, Plastic, and
Glass for:
• Consumer Electronics:
– Smartphones
– Smart Watches and Other Wearable Devices
– Smart Speakers
– Tablets/PCs
– Virtual Reality Headsets
– Sound Bars
• Industrial Applications:
– Televisions
– Handheld Devices
– Home Appliances
– HMI Panels and Keypads
3 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.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
LDC2112/LDC2114 DSBGA (16)
1.6 mm × 1.6 mm
LDC2112/LDC2114 TSSOP (16)
5.0 mm × 4.4 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Simplified Schematic
IN0
IN1
IN2
IN3
COM
LDC2114
Digital
Algorithm
Resonant
Circuit
Driver
Inductive
Sensing Core
Logic
I²C
VDD
OUT0
OUT1
OUT2
OUT3
INTB
LPWRB
SCL
SDA
GND
Copyright © 2016, Texas Instruments Incorporated
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.