GUI for evaluation module (EVM)
LDC2112
2-Ch inductance to digital converter with baseline tracking for low power touch buttons
Data sheet
LDC2112
- 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
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
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Evaluation board
LDC2114EVM — LDC2114 1.8V 4-Channel Inductive Touch Evaluation Module
The LDC2114EVM (Evaluation Module) demonstrates the use of inductive sensing to detect a button press on a monolithic piece of metal. The EVM can connect up to 4 buttons using the LDCTOUCHCOMCOILEVM or customized coils designed through Webench. Button presses & levels of pressure are indicated (...)
User guide: PDF
Evaluation board
LDCTOUCHCOMCOILEVM — Inductive Touch Sensor Coil Evaluation Board
The LDCTOUCHCOMCOILEVM is designed to provide maximum flexibility for system prototyping in inductive touch applications and allows experimentation with different coil sizes. It includes 5 sets of different sized PCB coils with integrated spacers & perforations such that the coils can be (...)
User guide: PDF
Calculation tool
LDC-CALCULATOR-TOOLS — Inductive Sensing Design Calculator Tool
The inductive sensing calculator tools provide two Excel spreadsheets to assist in the design process for inductive-to-digital converter (LDC) devices. These tools provide coil design assistance as well as some device-specific configurations.
Supported products & hardware
Products
Inductive sensor AFEs
Hardware development
Evaluation board
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFD) | 16 | Ultra Librarian |
| TSSOP (PW) | 16 | Ultra Librarian |
Ordering & quality
Information included:
- RoHS
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- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Information included:
- Fab location
- Assembly location
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