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부품번호 | MC34940 기능 |
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기능 | Electric Field Imaging Device | ||
제조업체 | Freescale Semiconductor | ||
로고 | |||
전체 9 페이지수
www.DataSheet4U.com
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.
Table 3. DYNAMIC ELECTRICAL CHARACTERISTICS
Characteristics noted under conditions 5.5 V ≤ VSUP ≤ 18 V, 0°C ≤ TA ≤ 90°C, GND = 0 V unless otherwise noted. Typical
values noted reflect the approximate parameter means at TA = 25°C under nominal conditions unless otherwise noted.
Characteristic
Symbol Min Typ Max Unit
OSC (ROSC)
OSC Frequency Stability
OSC Center Frequency
ROSC = 39 kΩ
ROSC = 20 kΩ
ROSC = 82 kΩ
Harmonic Content
2nd through 4th Harmonic Level
5th and Higher
SHIELD DRIVER (SHIELD)
Shield Driver Maximum Harmonic level below Fundamental
10 pF ≤ CLOAD ≤ 500 pF
Shield Driver Gain Bandwidth Product
Measured at 120 kHz
f STAB
f OSC
OSCHARM
SDHARM
SDGBW
–
–
–
–
–
–
–
–
– 10 %
kHz
120 –
240 –
60 –
dB
– -20
– -60
dB
-20 –
MHz
4.5 –
MC34940
4
Sensors
Freescale Semiconductor
4페이지 BASIC CONNECTIONS
Pin Descriptions
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 6 Pin Descriptions
Table 5. Electrode Selection
Terminal/SIGNAL
C
No electrodes selected
E1
E2
E3
E4
E5
E6
E7
0
0
0
0
1
1
1
1
BA
00
01
10
11
00
01
10
11
Table 6. Pin Description
Pin
Number
Pin Name
Definition
1
2, 24
3
4,5,6
7
DGND
N/C
SHIELDEN
C, B, A
LEVEL
Connected to the ground return
These pins should be left open.
Used to enable the shield signal
Controls electrode or reference activity
This is the detected, amplified, and
offset representation of the signal
voltage on the selected electrode
8 LPCAP A capacitor on this pin forms a low pass
filter with the internal series resistance
from the detector to this pin
9 ROSC A resistor from this pin to circuit ground
determines the operating frequency of
the oscillator
10 VDDCAP A 47µF capacitor is connected to this
pin to filter the internal analog regulated
supply
11 VPWR 12 V power applied to this pin will be
converted to the internal regulated
voltages needed to operate the part
12 VCCCAP A 47µF capacitor is connected to this
pin to filter the internal digital regulated
supply
13 AGND Connected to the ground return of the
analog circuitry
14 SHIELD Connects to cable shields to cancel
cable capacitance.
15
16
17-23
GND
TEST
E1 – E7
Main IC ground
Connect to circuit ground
Electrode pins
MCU
Analog In
Electrode Select
Shield Enable
47uF
47uF
MC34940
VCCCAP
ROSC
VDDCAP
LPCAP
LEVEL
3
A, B, C
SHIELDEN
+12V
VPWR
TEST
AGND
GND
E1
E7
SHIELD
Figure 7 Simplified Application Diagram
39k
10nF
Field Electrodes
(E1 through E7)
Sensors
Freescale Semiconductor
MC34940
7
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부품번호 | 상세설명 및 기능 | 제조사 |
MC34940 | Electric Field Imaging Device | Freescale Semiconductor |
DataSheet.kr | 2020 | 연락처 | 링크모음 | 검색 | 사이트맵 |