原标题：TI LDC1000 感应电感值数字转换器参考设计方案

　　TI公司的LDC1000是一款一种非接触式、短程传感技术的传感器芯片，具有低成本、高分辨率遥感的导电性。在恶劣环境中，具有非常高的可靠性，适用于检测灰尘、污垢,油和水分等的存在。感应传感技术使精确测量的线性/角位置、位移、运动、压缩、振动、金属成分等,感应传感提供了更好的性能和可靠性，较低的成本成为有竞争力的解决方案。本文首先介绍芯片的简介、特性、内部框图及应用领域，并给出相应设计方案的设计原理图、元器件列表及PCB元件布局图。

　　Inductive Sensing is a contact-less, short-range sensing technology that enables low-cost, high-resolution sensing of conductive targets in the presence of dust, dirt, oil, and moisture, making it extremely reliable in hostile environments. Using a coil which can be created on a PCB as a sensing element, the LDC1000 enables ultra-low cost system solutions.

　　Inductive sensing technology enables precise measurement of linear/angular position, displacement, motion, compression, vibration, metal composition, and many other applications in markets including automotive, consumer, computer, industrial, medical, and communications. Inductive sensing offers better performance and reliability at lower cost than other, competitive solutions.

　　The LDC1000 is the world’s first inductance-to-digital converter, offering the benefits of inductive sensing in a low-power, small-footprint solution. The product is available in a SON-16 package and offers several modes of operation. An SPI interface simplifies connection to an MCU.

　　LDC1000主要特性：

　　Magnet-Free Operation

　　Sub-Micron Precision

　　Adjustable Sensing Range (via Coil Design)

　　Lower System Cost

　　Remote Sensor Placement (Decoupling the LDC

　　from Harsh Environments)

　　High Durability (by Virtue of

　　Contact-Less Operation)

　　Insensitivity to Environmental Interference

　　(such as Dirt, Dust, Water, Oil)

　　Supply Voltage, Analog: 4.75V to 5.25V

　　Supply Voltage, IO: 1.8V to 5.25V

　　Supply Current (w/o LC Tank): 1.7mA

　　Rp Resolution: 16-bit

　　L Resolution: 24-bit

　　LC Frequency Range: 5kHz to 5MHz

　　LDC1000应用：

　　Drive-by-Wire Systems

　　Gear-Tooth Counting

　　Flow Meters

　　Push-Button Switches

　　Notebook Computers

　　Game Controllers

　　Multi-Function Printers

　　Digital Cameras

　　Medical Devices

　　图1. LDC1000内部方框图

　　LDC1000方案介绍：

　　The LDC1000EVM (Evaluation Module) demonstrates the use of inductive sensing technology to sense and measure the presence, position or composition of a conductive target object. The module includes an example of a PCB sensor coil. An MSP430 microcontroller is used to interface the LDC to a host computer.

　　This module is designed to provide the user with maximum flexibility for system prototyping. It is perforated at two locations: one, between the PCB sensor coil (LC tank) and the LDC1000 IC, and another, between the LDC1000 IC and the MSP430 interface. The first perforation gives the user the option to snap off the PCB coil from the module and experiment with custom sensor coils. The second perforation allows the user to connect the LDC1000+Sensor to a different microcontroller system or use multiple such sensors in one system.

　　An accompanying GUI allows for maximum flexibility and experimentation but the EVM also indicates basic conductor detection with an on-board LED.

　　Features

　　Two board perforations: provide maximum evaluation and system design flexibility

　　Includes an example of a PCB sensor coil

　　Operates standalone or via PC

　　Accompanying GUI for quick concept demonstration and data capture

　　EVM design accelerates prototyping of end application

　　LDC1000方案原理图：

　　LDC1000方案材料清单：