2-Ch inductance to digital converter with baseline tracking for low power touch buttons
Product details
Parameters
Package | Pins | Size
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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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.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
Features
- <7µA at 0.625 samples per second
- Up to 4 buttons supported
- Dedicated button logic outputs
- Integrated and configurable algorithms for button press detection
Description
Features
- 5 sets of 4 coils with different sizes for prototyping
- Integrated spacer for easy attachment to button surface
- Simple to use connectors from sensor coil board to device board
Design tools & simulation
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| DSBGA (YFD) | 16 | View options |
| TSSOP (PW) | 16 | View options |
Ordering & quality
Support & training
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Training series
View all TI training and videosVideos
Anti-tamper Techniques to Thwart Attacks on Smart Meters—Detecting case tamper attacks using inductive switches: TIDA-01377 Case Tamper Detection using Inductive Sensing Reference Design Demo
Watch the TIDA-01377 in action as it detects when someone opens the terminal block case of an electricity meter!
