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Freescale Semiconductor Electronic Components Datasheet

MC33794 Datasheet

Electric Field Imaging Device

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MC33794 pdf
Freescale Semiconductor
Technical Data
Electric Field Imaging Device
The MC33794 is intended for applications where noncontact sensing of
objects is desired. When connected to external electrodes, an electric field is
created.,The MC33794 is intended for use in detecting objects in this electric
field. The IC generates a low-frequency sine wave. The frequency 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 MC33794 also contains support circuits for a microcontroller unit (MCU)
to allow the construction of a two-chip E-field system.
Features
• Supports up to 9 Electrodes and 2 References or Electrodes
• Shield Driver for Driving Remote Electrodes Through Coaxial Cables
• +5.0 V Regulator to Power External Circuit
• ISO-9141 Physical Layer Interface
• Lamp Driver Output
• Watchdog and Power-ON Reset Timer
• Critical Internal Nodes Scaled and Selectable for Measurement
• High-Purity Sine Wave Generator Tunable with External Resistor
Typical Applications
• Occupant Detection Systems
• 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
• Liquid Level Sensing
Device Name
MC33794EK/R2
ORDERING INFORMATION
Temperature Range (TA)
Package
Drawing
-40°C to 85°C
1390-02
Package
54 SOICW-EP
Document Number: MC33794
Rev 9, 11/2006
MC33794
ELECTRIC FIELD
IMAGING DEVICE
EK SUFFIX
54-LEAD SOICW-EP
CASE 1390-02
© Freescale Semiconductor, Inc., 2006. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

MC33794 Datasheet

Electric Field Imaging Device

No Preview Available !

MC33794 pdf
INTERNAL BLOCK DIAGRAM
A,B,C,D
TEST
2.8 k
E1 – E9
REF_A*, REF_B*
2.8 k
* REF_A and REF_B are
not switched to ground
when not selected.
VDD
VCC
RST
WD_IN
VPWR
AGND
GND and HEAT SINK
PWR_MON
VDD_MON
LAMP_GND
LAMP_CTRL
ISO_OUT
ISO_IN
4
CONTROL
LOGIC
MUX
OUT
MUX
IN
POR/
WD
VCC
REG
VDD
REG
22 k(Nominal)
OSC
150
300
CLK
R_OSC
39 k
SHIELD_EN
SHIELD
RECT
LPF
GAIN AND
OFFSET
LP_CAP
10 nF
ATTN
LEVEL
SIGNAL
LAMP_SENSE
LAMP_MON
LAMP CKT
ISO-9141
LAMP_OUT
ISO-9141
(Note: All Resistor Values are Nominal)
Figure 1. Simplified Functional Block Diagram
MC33794
2
Sensors
Freescale Semiconductor


Part Number MC33794
Description Electric Field Imaging Device
Maker Freescale Semiconductor
Total Page 18 Pages
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