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FDC2214QRGHTQ1 bảng dữ liệu(PDF) 10 Page - Texas Instruments

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tên linh kiện FDC2214QRGHTQ1
Giải thích chi tiết về linh kiện  Capacitance-to-Digital Converter (FDC) for Capacitive Sensing
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nhà sản xuất  TI1 [Texas Instruments]
Trang chủ  http://www.ti.com
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IN0A
IN0B
IN1A
IN1B
FDC2112 / FDC2212
VDD
GND
SCL
SDA
Int. Osc.
ADDR
INTB
SD
GND
MCU
VDD
3.3 V
3.3 V
GPIO
GPIO
0.1 F 1 F
Core
Resonant
circuit driver
Resonant
circuit driver
I
2C
I
2C
peripheral
3.3 V
L
Cap
Sensor 0
CLKIN
40 MHz
C
L
Cap
Sensor 1
C
Copyright © 2016, Texas Instruments Incorporated
10
FDC2112-Q1, FDC2114-Q1, FDC2212-Q1, FDC2214-Q1
SNOSCZ9 – MAY 2016
www.ti.com
Product Folder Links: FDC2112-Q1 FDC2114-Q1 FDC2212-Q1 FDC2214-Q1
Submit Documentation Feedback
Copyright © 2016, Texas Instruments Incorporated
7 Detailed Description
7.1 Overview
The FDC2112, FDC2114, FDC2212, and FDC2214 are high-resolution, multichannel capacitance-to-digital
converters for implementing capacitive sensing solutions. In contrast to traditional switched-capacitance
architectures, the FDC2112, FDC2114, FDC2212, and FDC2214 employ an L-C resonator, also known as L-C
tank, as a sensor. The narrow-band architecture allows unprecedented EMI immunity and greatly reduced noise
floor when compared to other capacitive sensing solutions.
Using this approach, a change in capacitance of the L-C tank can be observed as a shift in the resonant
frequency. Using this principle, the FDC is a capacitance-to-digital converter (FDC) that measures the oscillation
frequency of an LC resonator. The device outputs a digital value that is proportional to frequency. This frequency
measurement can be converted to an equivalent capacitance
7.2 Functional Block Diagrams
Figure 10. Block Diagram for the FDC2112 and FDC2212


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