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Document Number: MC33941
Rev. 4
Freescale Semiconductor
Technical Data
© Freescale Semiconductor, Inc., 2008. All rights reserved.
Electric Field Imaging Device
The MC33941 is intended for cost-sensitive applications where non-contact
sensing of objects is desired. When connected to external electrodes, an
electric field is created. The MC33941 detects objects in this electric field. The
IC generates a low-frequency sine wave, which is adjustable by using an
external resistor and is optimized for 120 kHz. The sine wave has very low
harmonic content to reduce harmonic interference. The MC33941 also
contains support circuits for a microcontroller unit (MCU) to allow the
construction of a two-chip E-field system.
Features
• Supports up to 7 Electrodes
• Shield Driver for Driving Remote Electrodes Through Coaxial
• High-Purity Sine Wave Generator Tunable with External Resistor
• Response Time Tunable with External Capacitor
• +5V Regulator to Power External Circuit
• Can support up to 28 touch pad sensors (2 way multiplexing)
• Extended Temperature Range -40° to 110°C
• Pb-Free and RoHS compliant
Typical Applications
• Appliance Control Panels and Touch Sensors
• Linear and Rotational Sliders
• Spill Over Flow Sensing Measurement
• Refrigeration Frost Sensing
• Industrial Control and Safety Systems Security
• Proximity Detection for Wake-Up Features
• Touch Screens
• Garage Door Safety Sensing
• PC Peripherals
• Patient Monitoring
• Point of Sale Terminals
• Size Detection
• Liquid Level Sensing
ORDERING INFORMATION
Device Name
Temperature
Range
Drawing Package
MC33941EG/R2 -40° to 110°C 98ASB42564B SOICW-24
MC33941
ELECTRONIC FIELD
IMAGING DEVICE
EG SUFFIX (Pb-FREE)
24-TERMINAL SOICW
CASE 751E-05
N/C
E7
E6
E5
E4
E3
E2
E1
TEST
GND
SHIELD
AGND
DGND
N/C
SHIELDEN
C
B
A
LEVEL
LPCAP
ROSC
VDDCAP
VPWR
VCCCAP
Pin Connections
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