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Motorola Electronic Components Datasheet

MC33794 Datasheet

Electric Field Imaging Device

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MOTOROLA
SEMICONDUCTOR TECHNICAL DATA
Product Preview
Electric Field Imaging Device
The 33794 is intended for applications where noncontact sensing of objects
is desired. When connected to external electrodes, an electric field is created.
The 33794 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 33794 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
• 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
Document order number: MC33794/D
Rev 6.0, 04/2003
33794
ELECTRIC FIELD
IMAGING DEVICE
DH SUFFIX
CASE 1291
44-LEAD HSOP
DWB SUFFIX
CASE 1390
54-LEAD SOICW-EP
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33794DH/R2 -40 to 85°C
44 HSOP
MC33794DWB/R2 -40 to 85°C 54 SOICW-EP
33794 Simplified Application Diagram
+12 V
47 µF
Indicator
Lamp
VCC
10 nF
Analog_IN
Analog_IN
Analog_IN
Analog_IN
Analog_IN
MCU
ISO_Tx
ISO_Rx
Watchdog
Reset
GPx
Electrode Select
Shield Disable
4
0.1 µF 33794
VPWR
LAMP_OUT
LP_CAP
LEVEL
VDD_MON
VCC
VDD
PWR_MON
LAMP_MON
ISO-9141
LAMP_SENSE
ISO_IN SIGNAL
ISO_OUT
WD_IN REF_A
RST
REF_B
LAMP_CTRL
LAMP_GND
TEST
A, B, C, D
E1
E2
DIS_SHIELD E9
SHIELD
GND
R_OSC AGND
39 k
10 k
47 µF
ISO-9141 Bus
Monitor (Optional)
100 pF
10 pF
1
2 Field Electrodes
9
This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Motorola, Inc. 2003


Motorola Electronic Components Datasheet

MC33794 Datasheet

Electric Field Imaging Device

No Preview Available !

A,B,C,D
TEST
5.6 k
E1 E9
+ REF_A REF_B
5.6 k
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
22 k(Nominal)
OSC
MUX
IN
POR/
WD
VCC
REG
VDD
REG
RECT
LPF
GAIN AND
OFFSET
ATTN
CLK
R_OSC
39 k
DIS_SHIELD
SHIELD
47 k
LP_CAP
10 nF
LEVEL
SIGNAL
LAMP_SENSE
LAMP_MON
LAMP CKT
ISO-9141
LAMP_OUT
ISO-9141
Figure 1. 33794 Internal Block Diagram
33794
2
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA


Part Number MC33794
Description Electric Field Imaging Device
Maker Motorola
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MC33794 Datasheet PDF






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