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Freescale Semiconductor Electronic Components Datasheet



MC33941

Electric Field Imaging Device



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MC33941 pdf
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Freescale Semiconductor
Technical Data
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 0 to 110oC
• 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
MC33941EG/R2
0 to 110°C
98ASB42564B
Package
SOICW-24
Document Number: MC33941
Rev. 3, 11/2006
MC33941
ELECTRONIC FIELD
IMAGING DEVICE
EG SUFFIX (Pb-FREE)
24-TERMINAL SOICW
CASE 751E-04
DGND
N/C
SHIELDEN
C
B
A
LEVEL
LPCAP
ROSC
VDDCAP
VPWR
VCCCAP
N/C
E7
E6
E5
E4
E3
E2
E1
TEST
GND
SHIELD
AGND
Pin Connections
© Freescale Semiconductor, Inc., 2006. All rights reserved.



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A,B,C
E1-E7
2.8 k
2.8 k
3
CONTROL
LOGIC
MUX
OUT
OSC
22 k(Nominal)
700
MUX
IN
150
ROSC
SHIELDEN
SHIELD
VCCCAP
VDDCAP
VPWR
AGND
GND
700
VCC
REG
VDD
REG
RECT
LPF
LPCAP
GAIN AND
OFFSET
LEVEL
Figure 1. Simplified Functional Block Diagram
MC33941
2
Sensors
Freescale Semiconductor



Part Number MC33941
Description Electric Field Imaging Device
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 11 Pages
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