820M1 SINGLE AXIS CONDITION
MONITORING ACCELEROMETER
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FEATURES
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Amplified ±1.25V Signal Output
3.0 to 5.5Vdc Excitation Voltage
Hermetically Sealed LCC Package
Piezo-Ceramic Crystal, Shear Mode
-40° to +125°C Operating Range
Small PCB footprint
APPLICATIONS
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Machine Health Monitoring
Predictive Maintenance Installations
Embedded Vibration Monitoring
Impact & Shock Monitoring
Data Loggers
Bearing Installations
Security monitoring
Single Axis Piezoelectric Accelerometer
±25g to ±6000g Dynamic Ranges
Wide Bandwidth to 10,000Hz
Superior Resolution to MEMS Devices
Circuit Board Mountable, Reflow Solderable
Low Cost, Superior Value
The Model 820M1 is a low cost, single axis board mountable
accelerometer designed for embedded condition monitoring and
preventive maintenance applications. The piezo-electric
accelerometer is available in ranges from ±25g to ±6000g and
features a flat frequency response up to >10kHz. The model
820M1 accelerometer features a stable piezo-ceramic crystal in
shear mode with low power electronics, sealed in a fully hermetic
LCC package.
The PE technology incorporated in the 820M1 accelerometer
has a proven track record for offering the reliable and long-term
stable output required for condition monitoring applications. The
accelerometer is designed and qualified for machine health
monitoring and has superior resolution, dynamic range and
bandwidth compared to MEMS devices.
For three axis measurements, TE Connectivity also offers other
accelerometer models with the same outstanding performance
specifications.
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TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 1
820M1 SINGLE AXIS ACCELEROMETER
ABSOLUTE MAXIMUM RATINGS(1)
Parameter
Supply voltage(2)
Storage temperature
Shock limit (any axis)
ESD
Symbol
Vdd
TS
gmax
Min
1.5
-40
Typ
3.3
-2
Max
5.5
125
10,000
+2
Unit
V
°C
g
kV
Notes/Conditions
Human body model
(1) Maximum
limits the device will withstand without damage
(2) With 1.5V-2.5V excitation, full-scale range will be limited. So 2.8V min recommended.
OPERATING RANGES & NOISE - ACCELEROMETER
(Unless otherwise specified, all parameters are measured at 24°C @ 3.3V applied)
NonResidual
Sensitivity
Spectral Noise (mg/√Hz)
Measurement
Linearity
Noise(1)
mV/g
Range (g)
10Hz
100Hz
1kHz
(%FSO)
(mg RMS)
(±30%)
±25
±50
±100
±200
±500
±6000
(1) 2Hz
50.0
25.0
12.5
5.00
2.50
0.21
±2
±2
±2
±2
±2
±2
2.9
5.9
11.7
23.2
58.8
705
0.15
0.29
0.58
1.16
2.92
35.0
0.07
0.13
0.27
0.53
1.34
16.1
0.03
0.05
0.09
0.18
0.52
6.24
10kHz
0.02
0.05
0.09
0.18
0.45
5.40
to 10 kHz
ELECTRICAL SPECIFICATIONS
(Unless otherwise specified, all parameters are measured at 24°C @ 3.3V applied)
Parameters
Symbol
Min
Typ
Max
Unit
Excitation voltage
Vdd
3.3
5.5
Vdc
Zero g output voltage
Vdd/2
Average supply current
Iavg
62
µA
Output impedance
Rout
100
Ω
Warm-up time
1
Sec
Notes/Conditions
50% of applied voltage
OPERATING SPECIFICATIONS - ACCELEROMETER
(Unless otherwise specified, all parameters are measured at 24°C @ 3.3V applied)
Parameter
Symbol
Min
Typ
Max
Unit
Full scale output
±1.25
V
0.0g output voltage (bias V)
Vdd/2
Frequency response
6
10k
Hz
Frequency response
2
15k
Hz
Resonant frequency
30k
Hz
Transverse sensitivity
8
%
Temperature sensitivity
±8
%
Calibration
TE CONNECTIVITY SENSORS /// MODEL 820M1
Notes/Conditions
±1db
±3db
-40 to 125°C
Refer to typical curve
CS-SENS-0100 NIST Traceable Amplitude Calibration at 80Hz
All parts shipped with calibration data
10/2022
Page 2
820M1 SINGLE AXIS ACCELEROMETER
ENVIRONMENTAL SPECIFICATIONS
Parameter
Operating temperature
Storage temperature
Ambient humidity
Ingress protection
Symbol
IP
Min
-40
-40
0
68
Typ
Max
125
125
100
Unit
°C
°C
%
Notes/Conditions
Hermetic Package
External exposed surfaces:
Alumina
Gold
Au/Sn Solder
1.2
grams
Media compatibility
Weight
BLOCK DIAGRAM
IR REFLOW TEMPERATURE PROFILE
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 3
820M1 SINGLE AXIS ACCELEROMETER
DIMENSIONS
CONNECTION TABLE
Pin Number
1
2
3
4
5
6
7
8
9
10
Definition
N/C
GND
X axis output
Vdd
N/C
N/C
N/C
N/C
N/C
N/C
N/C connections – do not connect to the circuit
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 4
820M1 SINGLE AXIS ACCELEROMETER
TYPICAL ACCELEROMETER FREQUENCY RESPONSE CURVE
Graph 1
TYPICAL ACCELEROMETER SENSITIVITY SHIFT vs AMBIENT TEMPERATURE
Graph 2
IR REFLOW TEMPERATURE PROFILE
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 5
820M1 SINGLE AXIS ACCELEROMETER
MOUNTING CONSIDERATIONS
Accelerometers are used to measure vibration and motion of various pieces of equipment and their components.
To obtain the most faithful reproduction of the movements, a solid mounting method is required. The model 820M1
is designed to surface mount on a PC board with the primary attachment being the connection solder pads.
Although it is recommended that several of the contacts (pins 4-6 & 10-12) not be connected to any part of the
electrical circuit, mating solder pads can be added to the PC board but then left unconnected. Soldering all contacts
of the accelerometer will provide the most solid mounting and best measurement results.
Rigid support for the accelerometer PC board will also help to improve the quality of measurement signals.
Ultimately, the accelerometer must move at the same frequencies and displacements as the object of interest. PC
board mounting that’s not rigid enough will introduce unwanted noise and resonant frequencies into the
measurement signal.
Figure 1 shows an example of a poorly mounted
accelerometer. With no support close to the
sensor, the PC board will flex and vibrate at its
own resonant frequency much like a trampoline.
This will introduce unwanted resonant peaks into
the frequency range of interest making accurate
data collection difficult.
Figure 2 shows a better mounting design that
provides support very close to the sensor and
helps to eliminate unwanted vibrations and noise.
If the PC board is mounted on standoffs, locate at
least two standoffs as close to the accelerometer
as possible.
This will help stabilize the
accelerometer mounting surface and help to
ensure that faithful vibration and motion get
transferred to the sensor.
Figure 3 shows the addition a rigid mounting block
directly between the accelerometer PC board
and the vibrating object. This design provides
good coupling. Use a rigid adhesive on both
mating surfaces of the block for good mechanical
coupling.
Figure 4 shows the PC board attached directly to
the vibration source. Use a rigid adhesive to
improve the transmission of high frequency
vibrations and acoustic energy. Soft or elastic
adhesives (pressure sensitive adhesive, RTVs,
pliable glues, etc.) tend to dampen and absorb
higher frequency excitations. Don’t use them.
Figure 1
Figure 2
Figure 3
Figure 4
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 6
820M1 SINGLE AXIS ACCELEROMETER
ORIENTATION CONSIDERATIONS
The 820M1 accelerometer is able to sense and measure motion and acceleration in a single axis only. It provides
an analog voltage output that represents the acceleration magnitude. The accelerometer must be properly
oriented during assembly into the application to ensure that its output will be accurate.
As shown in the detailed dimension drawing, the sensing axis is shown by an arrow on the sensor package. The
sensing direction is parallel to the arrow and the closest edge of the accelerometer package. When the sensor is
designed into an application, it must be oriented to align with the desired measurement direction of the customer
product.
There are many places in an application where alignment errors can appear. The 820M1 is mounted on a PC
board and must be carefully aligned to it. The PC board is part of a subsystem and must be carefully aligned
there also. And finally, the subsystem is part of the overall product and must be aligned to that. Each of these
mounting interfaces can be a source of mis-alignment errors and when summed can become significant.
For the 820M1 accelerometer, there are two types of alignment errors – rotational and tilt. Figures 5 & 6 show
how these occur.
Rotation
Misalignment
Tilt
Misalignment
Figure 5
Figure 6
Both types of misalignment result in incorrect output voltages for vibration amplitude. The output error will be
proportional to the cosine of the error angle θ.
In figure 5, if the acceleration or vibration is along the Y axis, a rotational misalignment error will decrease the Y
axis signal by the cosine of the error angle.
In figure 6, if acceleration is along the X axis, and the sensor is tilted, then the error will decrease the X axis signal
by the cosine of the error angle.
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 7
820M1 SINGLE AXIS ACCELEROMETER
PACKAGING OPTIONS
The 820M1 comes in two packaging options, Tray and Tape & Reel. The Tray option contains 50 pieces. Only
whole trays are shipped, so orders must be placed for integer multiples of 50. The Tape & Reel option contains
300 pieces. Only whole reels are shipped, so orders must be placed for integer multiples of 300. For smaller or
uneven orders, please contact one of our Distribution partners as listed on our website.
Stackable Trays – 50 pieces per tray
Tape & Reel – 300 pieces per reel
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 8
820M1 SINGLE AXIS ACCELEROMETER
ORDERING INFORMATION
820M1-xxxx
Suffix
G Range
0025
0050
0100
0200
0500
6000
25g
50g
100g
200g
500g
6000g
Packaging Part Number
Tape & Reel (300 pcs)
Tray (50 pcs)
20005836-00
20005836-01
20005837-00
20005837-01
20005838-00
20005838-01
20007178-00
20007178-01
20007179-00
20007179-01
20007180-00
20007180-01
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AMERICAS
EUROPE, MIDDLE EAST, AFRICA
ASIA & PACIFIC
tesensors-ccmeas@te.com
sensor-customercare.apac@te.com
sensor-customercare.emea@te.com
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The information given herein, including drawings, illustrations and schematics which are intended for illustration purposes only, is believed to be reliable. However, TE Connectivity makes no
warranties as to its accuracy or completeness and disclaims any liability in connection with its use. TE Connectivity‘s obligations shall only be as set forth in TE Connectivity‘s Standard Terms
and Conditions of Sale for this product and in no case will TE Connectivity be liable for any incidental, indirect or consequential damages arising out of the sale, resale, use or misuse of the
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TE Connectivity Ltd. All Rights Reserved.
TE CONNECTIVITY SENSORS /// MODEL 820M1
10/2022
Page 9