FDC1004 Datasheet, PDF (1/33 Pages) Texas Instruments – 4-Channel Capacitance-to-Digital Converter

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FDC1004
SNOSCY5B – AUGUST 2014 – REVISED APRIL 2015
FDC1004 4-Channel Capacitance-to-Digital Converter for Capacitive Sensing Solutions
1 Features
•1 Input Range: ±15 pF
• Measurement Resolution: 0.5 fF
• Maximum Offset Capacitance: 100 pF
• Programmable Output Rates: 100/200/400 S/s
• Maximum Shield Load: 400 pF
• Supply Voltage: 3.3 V
• Temp Range: –40° to 125°C
• Current Consumption:
– Active: 750 µA
– Standby: 29 µA
• Interface: I²C
• Number of Channels: 4
2 Applications
• Proximity Sensor
• Gesture Recognition
• Automotive Door / Kick Sensors
• Automotive Rain Sensor
• Remote and Direct Liquid Level Sensor
• High-resolution Metal Profiling
• Rain / Fog / Ice / Snow Sensor
• Material Size Detection
• Material Stack Height
3 Description
Capacitive sensing with grounded capacitor sensors
is a very low-power, low-cost, high-resolution contact-
less sensing technique that can be applied to a
variety of applications ranging from proximity sensing
and gesture recognition to material analysis and
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 FDC1004 is a high-resolution, 4-channel
capacitance-to-digital converter for implementing
capacitive sensing solutions. Each channel has a full
scale range of ±15 pF and can handle a sensor offset
capacitance of up to 100 pF, which can be either
programmed internally or can be an external
capacitor for tracking environmental changes over
time and temperature. The large offset capacitance
capability allows for the use of remote sensors.
The FDC1004 also includes shield drivers for sensor
shields, which can reduce EMI interference and help
focus the sensing direction of a capacitive sensor.
The small footprint of the FDC1004 allows for use in
space-constrained applications. The FDC1004 is
available in a 10-pin WSON and VSSOP package
and features an I²C interface for interfacing to an
MCU.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
FDC1004
WSON (DSC)
VSSOP (DGS)
3.0 mm x 3.0 mm
3.0 mm x 3.0 mm
(1) For all available packages, see the orderable addendum at
the end of the datasheet.
4 Typical Application
LEVEL
SENSOR
ENVIRONMENTAL
SENSOR
LIQUID
SENSOR
SHLD1
SHLD2
CIN1
CIN2
CIN3
CIN4
3.3 V
EXCITATION
FDC1004
VDD
3.3 V 3.3 V
CHA
MUX
CHA
CAPACITANCE
TO DIGITAL
CONVERTER
OFFSET
& GAIN
CALIBRATION
CHB
MUX
CHB
CONFIGURATION & DATA
REGISTERS
SCL
I²C _SDA
CAPDAC
GND
3.3 V
VDD
MCU
I2C
Peripheral
GND
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.