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See Technical Specifications

LDC2112PWT

2-Ch inductance to digital converter with baseline tracking for low power touch buttons

Manufacturer:

Texas Instruments, Inc
Mfr.Part #:

LDC2112PWT
Datasheet:

LDC2112PWT Datasheet (PDF)
Type:

Inductance-to-Digital Converter
Number of Channels:

2
Resolution (Bits):

12 b
Data Interface:

I²C
EDA/CAD Models:

Request Free CAD Models for LDC2112PWT

Email: [email protected]

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LDC2112PWT General 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.

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Key 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

Specifications

Category	Integrated Circuits (ICs)Data AcquisitionADCs/DACs - Special Purpose	Series	-
Type	Inductance-to-Digital Converter	Number of Channels	2
Resolution (Bits)	12 b	Sampling Rate (Per Second)	-
Data Interface	I²C	Voltage Supply Source	Single Supply
Voltage - Supply	1.71V ~ 1.89V	Operating Temperature	-40°C ~ 85°C (TJ)
Mounting Type	Surface Mount	Base Product Number	LDC2112