FDC2212_16 Datasheet, PDF (1/61 Pages) Texas Instruments – EMI-Resistant 28-Bit,12-Bit Capacitance-to-Digital Converter

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FDC2212, FDC2214, FDC2112, FDC2114
SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015
FDC2x1x EMI-Resistant 28-Bit,12-Bit Capacitance-to-Digital Converter for Proximity and
Level Sensing Applications
1 Features
•1 EMI-Resistant Architecture
• Maximum Output Rates (one active channel):
– 13.3 ksps (FDC2112, FDC2114)
– 4.08 ksps (FDC2212, FDC2214)
• Maximum Input Capacitance: 250 nF (at 10 kHz
with 1 mH inductor)
• Sensor Excitation Frequency: 10 kHz to 10 MHz
• Number of channels: 2, 4
• Resolution: up to 28 bits
• System Noise Floor: 0.3 fF at 100 sps
• Supply Voltage: 2.7 V to 3.6 V
• Power Consumption: Active: 2.1 mA
• Low-Power Sleep Mode: 35 uA
• Shutdown: 200 nA
• Interface: I²C
• Temperature range: -40°C to +125°C
2 Applications
• Proximity Sensor
• Gesture Recognition
• Level Sensor for Liquids, including Conductive
ones such as Detergent, Soap, and Ink
• Collision Avoidance
• Rain, Fog, Ice, Snow Sensor
• Automotive Door and Kick Sensors
• Material Size Detection
3 Description
Capacitive sensing is a low-power, low-cost, high-
resolution contactless sensing technique that can be
applied to a variety of applications ranging from
proximity detection and gesture recognition to remote
liquid level sensing. The sensor in a capacitive
sensing system is any metal or conductor, allowing
for low cost and highly flexible system design.
The main challenge limiting sensitivity in capacitive
sensing applications is noise susceptibility of the
sensors. With the FDC2x1x innovative EMI resistant
architecture, performance can be maintained even in
presence of high-noise environments.
The FDC2x1x is a multi-channel family of noise- and
EMI-resistant,
high-resolution,
high-speed
capacitance-to-digital converters for implementing
capacitive sensing solutions. The devices employ an
innovative narrow-band based architecture to offer
high rejection of noise and interferers while providing
high resolution at high speed. The devices support a
wide excitation frequency range, offering flexibility in
system design. A wide frequency range is especially
useful for reliable sensing of conductive liquids such
as detergent, soap, and ink.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
FDC2112, FDC2212 WSON (DNT 12) 4.00 mm x 4.00 mm
FDC2114, FDC2214 WQFN (RGH 16) 4.00 mm x 4.00 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
40 MHz
Simplified Schematic
3.3 V
FDC2114 / FDC2214
CLKIN
Int. Osc.
VDD
GND
0.1 F 1 F
3.3 V
VDD
LC
Cap
Sensor 0
IN0A
Resonant
IN0B circuit driver
Core
SD
INTB
3.3 V
GPIO
GPIO
MCU
GND
LC
Cap
Sensor 3
IN3A
Resonant
IN3B circuit driver
ADDR
I²C
SDA
SCL
I²C
peripheral
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.