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Freescale Semiconductor Electronic Components Datasheet



MC34940

Electric Field Imaging Device



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MC34940 pdf
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Freescale Semiconductor
Technical Data
Electric Field Imaging Device
The 34940 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 34940 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 34940 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
• Can support up to 28 touch pad sensors
• 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
MC34940EG/R2
0 to 90°C
98ASB42564B
Package
SOICW-24
Document order number: MC34940
Rev 2.0, 2/2006
34940
ELECTRONIC FIELD
IMAGING DEVICE
24 LEAD (PB-FREE)
SOICW
98ASB42344B
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
Figure 1. Pin Connections
© Freescale Semiconductor, Inc., 2006. All rights reserved.



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MC34940 pdf
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 2. Simplified Functional Block Diagram
Table 1. MAXIMUM RATINGS All voltages are with respect to ground unless otherwise noted. Exceeding these ratings may
cause a malfunction or permanent damage to the device.
Rating
Symbol
Value
Unit
Electrical Ratings
Peak VPWR Voltage
Double Battery
1 Minute Maximum TA = 30°C
ESD Voltage
Human Body Model (CZAP = 100 pF, RZAP = 1500 W)
Machine Model (CZAP = 200 pF, RZAP = 0 W)
Charge Device Model (CDM), Robotic (CZAP = 4.0pF)
Thermal Ratings
VPWRPK
VDBLBAT
VESD
40
26.5
± 2000
± 200
± 1200
V
V
V
Storage Temperature
Operating Ambient Temperature
Operating Junction Temperature
Thermal Resistance
Junction-to-Ambient (1)
Junction-to-Case (2)
Junction-to-Board (3)
Soldering Temperature(4)
TSTG
TA
TJ
RθJA
RθJC
RθJB
TSOLDER
-55 to 150
-0 to 90
-0 to 150
41
0.2
3.0
260
°C
°C
°C
°C/W
°C
MC34940
2
Sensors
Freescale Semiconductor



Part Number MC34940
Description Electric Field Imaging Device
Maker Freescale Semiconductor - Freescale Semiconductor
Total Page 9 Pages
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