Document
Product Folder
Sample & Buy
Technical Documents
Tools & Software
Support & Community
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, highresolution 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.
FDC2212, FDC2214, FDC2112, FDC2114
SNOSCZ5A – JUNE 2015 – REVISED JUNE 2015
www.ti.com
Table of Contents
1 Features .................................................................. 1 2 Applications ........................................................... 1 3 Description ............................................................. 1 4 Revision History..................................................... 2 5 Description, continued .......................................... 3 6 Device Comparison Table..................................... 3 7 Pin Configuration and Functions ......................... 4 8 Specifications......................................................... 5
8.1 Absolute Maximum Ratings ...................................... 5 8.2 ESD Ratings ............................................................ 5 8.3 Recommended Operating Conditions....................... 5 8.4 Thermal Information ................................................. 5 8.5 Electrical Characteristics........................................... 6 8.6 Timing Requirements ................................................ 7 8.7 Switching Characteristics - I2C ................................. 8 8.8 Typical Characteristics .............................................. 9 9 Detailed Description ............................................ 11 9.1 Overview ................................................................. 11 9.2 Functional Block Diagrams ..................................... 11 9.3 Feature Description................................................. 12
9.4 Device Functional Modes........................................ 21 9.5 Programming........................................................... 21 9.6 Register Maps ......................................................... 22 10 Application and Implementation........................ 39 10.1 Application Information.......................................... 39 10.2 Ty.