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FDC2212DNTT Arkusz danych(PDF) 11 Page - Texas Instruments

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Numer części FDC2212DNTT
Szczegółowy opis  Capacitance-to-Digital Converter for Proximity Level Sensing Applications
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Producent  TI1 [Texas Instruments]
Strona internetowa  http://www.ti.com
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FDC2212DNTT Arkusz danych(HTML) 11 Page - Texas Instruments

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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
FDC2212, FDC2214, FDC2112, FDC2114
www.ti.com
SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015
9 Detailed Description
9.1 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
9.2 Functional Block Diagrams
Figure 10. Block Diagram for the FDC2112 and FDC2212
Copyright © 2015, Texas Instruments Incorporated
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Product Folder Links: FDC2212 FDC2214 FDC2112 FDC2114


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