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
The LDC2114 Evaluation Module for inductive touch applications demonstrates using inductive sensing for button-press detection on a monolithic piece of metal. The LDC2114EVM does not include any example sensors or PCB coils but is capable of connecting up to 4 buttons using the LDCTOUCHCOMCOILEVM (...)
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
- Includes WM11299-ND-cable and ZIF connector for LDCTOUCHCOMCOILEVM
- PCB perforations allow for removal of the included MSP430 microcontroller so that a (...)
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
Software development
Design tools & simulation
CAD/CAE symbols
| Package | Pins | Download |
|---|---|---|
| DSBGA (YFD) | 16 | View options |
| TSSOP (PW) | 16 | View options |
Ordering & quality
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- MTBF/FIT estimates
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- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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