FDC1004Q Datasheet, PDF (1/29 Pages) Texas Instruments – 4-Channel Capacitance-to-Digital Converter

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FDC1004Q
SNOSCZ4 – APRIL 2015
FDC1004Q 4-Channel Capacitance-to-Digital Converter for Capacitive Sensing Solutions
1 Features
•1 Qualified for Automotive Applications
• AEC-Q100 Qualified With the Following Results
– Device Temperature Grade 1: -40°C to 125°C
Ambient Operating Temperature Range
– Device HBM ESD Classification Level 2
– Device CDM ESD Classification Level C5
• 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
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 FDC1004Q is a high-resolution, AEC-Q100
qualified, 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 FDC1004Q 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 FDC1004Q allows
for use in space-constrained applications. The
FDC1004Q is available in a 10-pin VSSOP package,
which allows for optical inspection in production, and
features an I²C interface for interfacing to an MCU.
Device Information⁽¹⁾
PART NUMBER
PACKAGE
BODY SIZE (NOM)
FDC1004Q
VSSOP (DGS)
3.0 mm x 3.0 mm
(1) See the orderable addendum at the end of the datasheet for
orderable part numbers.
4 Typical Application
Level
Sensor
Environmental
Sensor
Liquid
Sensor
1
SHLD1
SHLD2
CIN1
CIN2
CIN3
CIN4
3.3 V
Excitation
VDD
FDC1004Q
CHA
MUX
CHA
Capacitance to
Digital Converter
Offset and Gain
Calibration
3.3 V 3.3 V
CHB
MUX
CHB
Configuration and Data
Registers
SCL
I²C _SDA
CAPDAC
GND
3.3 V
VDD
MCU
I2C
Peripheral
GND
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.