Vibration Sensors
D7S
The World's Smallest Class Size,
High-precision Seismic Sensor.
IoT Friendly.
The SI value (or spectral intensity) is equivalent to the magnitude of
the destructive energy imposed by seismic motion on structures.
The SI value, which is the average value of the integrated velocity
response spectrum, is an index that expresses the destructive force of
seismic motion and is highly correlated with the damage to structures.
S I = S v ( T,h ) dT
∫
2.4
12.5
0.1
SI value
formula
What Is an SI Value? Relationship between SI Value and
Measured Seismic Intensity Equivalent Value
Vibration Sensors D7S
7
6
5
4
3
1.0 10.0 100.0
SI value (kine): Logarithmic axis
Seismic intensity scale of Japan
9.8mm
D7S
10.9mm
Compact & High-precision Seismic Sensors
- Reducing Secondary Disasters from Earthquakes -
2
As an index, the SI value has a higher
correlation with the seismic intensity scale
of Japan than the maximum acceleration
does. This makes it possible to make
judgments that accurately reflect structural
damage.
Ultra
Compact
High
Precision
IoT
Friendly
The Best for Embedding in Equipment
Maximum acceleration
Overview
Calculation load
Maximum acceleration value
Calculated from the
acceleration
Average value of the
shaking velocity
Small Large Small to medium
Correlation with
structural damage
Correlation with the
Japan Meteorological
Agency’s earthquake level
Empirical formula
set by the Japan
Meteorological Agency
Others
Seismic intensity scale of Japan
SI value
Comparison of SI Values and Acceleration
New earthquake detection sensors with high detection precision and low electricity
consumption through 3-axis acceleration sensors and a unique SI value calculation algorithm.
Superior cost performance.
The D7S can be embedded in essentially any device thanks to
its ultra-small size and ultra-low consumption to contribute to
package downsizing.
Earthquake Maps and Rescue Maps
Internal memory and I2C interface enable the creation of
original applications.
Rejects Impulse Vibration Noise
Spectral intensity (SI) high-precision earthquake indicator,
which correlates highly with damage to structures.
The SI value correlates
highly with the measured
seismic intensity and can be
calculated easily, so it is
used by major gas
companies and railroads too.
Introducing this
measurement method
involves cost because
Japan Meteorological
Agency certification is
required.
3
Earthquake Earthquake ends.
Emergency
Actions
With their high detection accuracy, these Sensors help with measures to
prevent secondary damage after earthquakes in a variety of settings.
Preventing
Secondary Damage
Shutting Off and Stopping
Hazardous Devices
- Semiconductors
- Chemical plants
- Distribution panels
4
Rescue
Restoration
Prevention
- Disaster map creation
Determining Damage
Mapping seismic intensity and building collapse information
Vibration Sensor communications enable the collection of
earthquake information to map damage conditions by area.
- Creating suitable restrictions for traffic and
train operation
5
6
D7S
D7S
Vibration Sensor
Helps Prevent Fire and Other Second-
ary Disasters after an Earthquake.
The World’s Smallest Class Size
Seismic Sensor.
• Using the SI value, which has a high correlation with the seismic
intensity scale that indicates the magnitude of an earthquake, provides
higher-precision judgment of seismic intensity scales.
• The 3-axis acceleration Sensor and OMRON’s unique SI value
calculation algorithm achieve surface-mountable compact modules
and low power consumption.
• Higher degree of freedom for incorporation into devices and prolonged
operation on battery power.
• Shutoff output terminal (INT1) operates equivalent to a conventional
mechanical vibration sensor and ensures compatibility with
mechanical vibration sensors.
•I
2C interface is able to obtain earthquake-related information from the
Sensor with communications from external devices.
Ordering Information
* Products are packed with embossed tape.
Characteristics/Performance
RoHS Compliant
Refer to the Safety Precautions on page 9.
Type Appearance Power supply voltage Model Minimum packing unit *
Surface-mounting
Vibration Sensor 2.1 to 5.5 V
D7S-A0001 1,000 pcs.
D7S-A0001-R100 100 pcs.
Item Model D7S-A0001
Power Supply Voltage 2.1 to 5.5 V
Current consumption During standby: 90 μA or less
Processing (average): 300 μA or less
Operating Temperature −30 to 70°C (with no condensation or icing)
Storage Temperature −40 to 80°C (with no condensation or icing)
Ambient Humidity 25% to 95% (with no condensation or icing)
Storage Humidity 25% to 95% (with no condensation or icing)
Acceleration Detection Range −2,000 to 2,000 gal
Shutoff Output (INT1) Output at seismic intensity level 5 or higher.
Communications Interface I2C
Dimensions 10.9 × 9.8 mm
Installation angle ±5°
7
D7S Vibration Sensor
D7S
Connections
Terminal Arrangement
Block Diagram
Circuit Diagrams
No. Signal Function Direction Description
1 VCC Power supply voltage ---
2 INT1 Shutoff output OUT
An open-drain output.
Goes active (ON) when the shutoff judgment condition and collapse detection condition
are met.
3INT2 Processing notification
output OUT
An open-drain output.
Goes active (ON) during earthquake calculations, offset acquisition, and self-diagnostic
processing.
4SCL I
2C clock IN Pull up the voltage to VCC even when you do not use I2C.
5SDA I
2C data IN/OUT Pull up the voltage to VCC even when you do not use I2C.
6 GND Power supply ground ---
7 SETTING Initial setting input IN
Changes the Sensor to Initial Installation Mode for an input from an external device.
Normal Mode: High
Initial Installation Mode: Low
8 NC Not connected --- Completely floating and cannot be connected to another line.
9 VCC Power supply voltage ---
10 GND Power supply ground ---
1
2
3
4
5
10
9
8
7
6
INPUT×2
VCC
OUTPUT×2
I
2
C
GND
D7S
SDA
SCL
VCC
INT1
INT2
1. VCC
2. INT1
3. INT2
4. SCL
5. SDA
10. GND
9. VCC
8. NC
7. SETTING
6. GND
SETTING
GND
VCC
8
D7S Vibration Sensor
D7S
Operation Chart
Dimensions (Unit: mm)
Power ON
(approx. 4 s) Standby
Initial installation
INT2
INT1
SETTING
Standby Standby SI value and other signal processing
(approx. 2 minutes)
Earthquake information stored.
Shutoff judgment (earthquake level 5 or higher).
Timing depends on seismic waves.
Power ON
Change to Initial Installation Mode by
making the Setting Pin low or by
executing Mode Register Setting
Change through I
2
C communications.
Vibration Sensor
operation
Start of earthquake
judgement
11.4
10
1.27
±0.05
5.08
±0.1
10.9±0.5
9.8
0.8±0.2
1.27±0.1
5.08
1
56
10
Lot number product ID label
0.9
2.1 max.
8.3
10
65
1
1
5
10
6
1.25 0
-0.05
8.3 0
-0.05
1.02 0
-0.05
D7S-A0001 Recommended Mounting Pattern
(TOP VIEW)
Note. Do not mount other components or place wiring pat-
terns in the area marked with diagonal lines.
Recommended Mounting Conditions
Peak mounting temperature: 245°C min. (260°C max.)
Reflow time: 64 to 80 s (220°C)
Reflow repetitions: Up to 2
(TOP VIEW) (BOTTOM VIEW)
9
D7S Vibration Sensor
D7S
Safety Precautions
This Sensor is a precision device. Do not drop it or subject it to
excessive shock or force. Doing so could break it or change its
characteristics. Do not use the Sensor if it has been dropped.
Operating Environment
• Do not use the Sensor in locations with volatile, flammable, or
corrosive gas (organic solvent vapor, sulfite gas, chlorine, sul-
fide gas, ammonia gas, etc.) or other toxic gases. They may
cause the Sensor to break down.
• Do not use the Sensor in locations subject to fresh water, salt
water, water drops, or splattering oil.
• Do not use the Sensor in an environment where condensation
or icing may occur. Moisture freezing on the Sensor may
cause output to fluctuate or may cause the Sensor to break
down.
• Do not use the Sensor in locations subject to direct sunlight.
Doing so may cause the Sensor to break down.
• Do not use the Sensor in locations subject to direct radiant
heat from heating equipment. Doing so may cause the Sensor
to break down.
• Do not use the Sensor in locations with severe temperature
changes. Doing so may cause the Sensor to break down.
• Do not use the Sensor in environments with excess mechani-
cal stress. Doing so may cause the Sensor to malfunction or
break down.
• Do not use the Sensor in locations with large vibration or
shock. These may cause the Sensor to break down.
• Do not use the Sensor in locations with strong electrical or
magnetic fields. These may cause the Sensor to break down.
Countermeasures against Noise
• The Sensor does not contain any protective circuits. Never
allow the electrical load to exceed the absolute maximum rat-
ings. Such loads may damage the circuits. If required, install
protective circuits so that absolute maximum ratings are not
exceeded.
• Allow as much space as possible between the Sensor and
devices that generate surges or high frequencies (such as
high-frequency welders and high-frequency sewing
machines). Attach a surge protector or noise filter on nearby
noise-generating devices (in particular, motors, transformers,
solenoids, magnetic coils, or other devices that have an induc-
tance component).
• Wire the Sensor away from high-voltage and large-current
power lines in order to prevent inductance noise. It is also
helpful to separate conduits and ducts and to use shielded
cables.
• When using a switching regulator, power supply switching
noise may cause malfunctions, so check this before use.
Handling
• Static electricity can destroy the Sensor. Take countermea-
sures including grounded work benches, floors, and other
charged objects and workers.
• Do not handle the Sensor in locations with excessive vapor,
dust, dirt, etc.
• Do not hold the Sensor with pliers, tweezers, or similar tools,
and do not subject components to damage or excessive shock
due to inadequate adjustment of the mounter.
• When placing components near the edge of the PCB or near a
connector, make sure that stress is not applied to the Sensor
when the device is assembled or when the connector is con-
nected or disconnected.
• Do not apply any external force to components after soldering
until everything has cooled off and do not allow mechanical
stress due to PCB warping or other factors.
• Under some usage conditions, ultrasound may cause the Sen-
sor to resonate and be destroyed. OMRON cannot specify the
detailed conditions under which the Sensor will be used, so we
assume no responsibility if the Sensor is used in environments
where ultrasound is used. If the Sensor must be used in an
environment with ultrasound, check its performance in the
actual environment beforehand.
• Stress due to plastic hardening may change Sensor character-
istics. Do not mold seal the Sensor after mounting.
• When applying a moisture preventing coating or other coating
after mounting the Sensor, select a coating with minimal stress
and check operation carefully.
• Do not attempt to disassemble or modify the Sensor.
• Do not use the Sensor in safety devices or for applications in
which Sensor operation would directly affect human life.
• Carefully read the precaution in the Instruction Manual before
using the Sensor.
• In addition, if you use the Sensor under conditions other than
those in these specifications, check Sensor operation under
those conditions beforehand.
Shipping and Storage
• Do not store the Sensor in locations with harmful corrosive gas
(organic solvent vapor, sulfite gas, sulfide gas, etc.)
• The Sensor is not drip proof, so do not store it anywhere that
water might get on it.
• Store the Sensor within appropriate temperature and humidity
ranges.
*Before storing the Sensor in an environment other than the
environment recommended by OMRON, evaluate the results
in the actual storage environment and judge whether or not
storage there is appropriate.
• Do not store the Sensor in locations with excessive vapor,
dust, dirt, etc.
Caution
Precautions for Correct Use
10
MEMO
Terms and Conditions Agreement
Read and understand this catalog.
Please read and understand this catalog before purchasing the products. Please consult your OMRON representative if you have
any questions or comments.
Warranties.
(a) Exclusive Warranty. Omron’s exclusive warranty is that the Products will be free from defects in materials and workmanship
for a period of twelve months from the date of sale by Omron (or such other period expressed in writing
by Omron). Omron disclaims all other warranties, express or implied.
(b) Limitations. OMRON MAKES NO WARRANTY OR REPRESENTATION, EXPRESS OR IMPLIED, ABOUT
NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE OF THE
PRODUCTS. BUYER ACKNOWLEDGES THAT IT ALONE HAS DETERMINED THAT THE PRODUCTS WILL
SUITABLY MEET THE REQUIREMENTS OF THEIR INTENDED USE.
Omron further disclaims all warranties and responsibility of any type for claims or expenses based on infringement by the Products
or otherwise of any intellectual property right. (c) Buyer Remedy. Omron’s sole obligation hereunder shall be, at Omron’s election,
to (i) replace (in the form originally shipped with Buyer responsible for labor charges for removal or replacement thereof) the
non-complying Product, (ii) repair the non-complying Product, or (iii) repay or credit Buyer an amount equal to the purchase price
of the non-complying Product; provided that in no event shall Omron be responsible for warranty, repair, indemnity or any other
claims or expenses regarding the Products unless Omron’s analysis confirms that the Products were properly handled, stored,
installed and maintained and not subject to contamination, abuse, misuse or inappropriate modification. Return of any Products by
Buyer must be approved in writing by Omron before shipment. Omron Companies shall not be liable for the suitability or
unsuitability or the results from the use of Products in combination with any electrical or electronic components, circuits, system
assemblies or any other materials or substances or environments. Any advice, recommendations or information given orally or in
writing, are not to be construed as an amendment or addition to the above warranty.
See http://www.omron.com/global/ or contact your Omron representative for published information.
Limitation on Liability; Etc.
OMRON COMPANIES SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT, INCIDENTAL, OR CONSEQUENTIAL DAMAGES,
LOSS OF PROFITS OR PRODUCTION OR COMMERCIAL LOSS IN ANY WAY CONNECTED WITH THE PRODUCTS,
WHETHER SUCH CLAIM IS BASED IN CONTRACT, WARRANTY, NEGLIGENCE OR STRICT LIABILITY.
Further, in no event shall liability of Omron Companies exceed the individual price of the Product on which liability is asserted.
Suitability of Use.
Omron Companies shall not be responsible for conformity with any standards, codes or regulations which apply to the
combination of the Product in the Buyer’s application or use of the Product. At Buyer’s request, Omron will provide applicable
third party certification documents identifying ratings and limitations of use which apply to the Product. This information by itself is
not sufficient for a complete determination of the suitability of the Product in combination with the end product, machine, system,
or other application or use. Buyer shall be solely responsible for determining appropriateness of the particular Product with
respect to Buyer’s application, product or system. Buyer shall take application responsibility in all cases.
NEVER USE THE PRODUCT FOR AN APPLICATION INVOLVING SERIOUS RISK TO LIFE OR PROPERTY OR IN LARGE
QUANTITIES WITHOUT ENSURING THAT THE SYSTEM AS A WHOLE HAS BEEN DESIGNED TO ADDRESS THE RISKS,
AND THAT THE OMRON PRODUCT(S) IS PROPERLY RATED AND INSTALLED FOR THE INTENDED USE WITHIN THE
OVERALL EQUIPMENT OR SYSTEM.
Programmable Products.
Omron Companies shall not be responsible for the user’s programming of a programmable Product, or any consequence thereof.
Performance Data.
Data presented in Omron Company websites, catalogs and other materials is provided as a guide for the user in determining
suitability and does not constitute a warranty. It may represent the result of Omron’s test conditions, and the user must correlate it
to actual application requirements. Actual performance is subject to the Omron’s Warranty and Limitations of Liability.
Change in Specifications.
Product specifications and accessories may be changed at any time based on improvements and other reasons. It is our practice
to change part numbers when published ratings or features are changed, or when significant construction changes are made.
However, some specifications of the Product may be changed without any notice. When in doubt, special part numbers may be
assigned to fix or establish key specifications for your application. Please consult with your Omron’s representative at any time to
confirm actual specifications of purchased Product.
Errors and Omissions.
Information presented by Omron Companies has been checked and is believed to be accurate; however, no responsibility is
assumed for clerical, typographical or proofreading errors or omissions.
• Application examples provided in this document are for reference only. In actual applications, confirm equipment functions and safety before using the product.
• Consult your OMRON representative before using the product under conditions which are not described in the manual or applying the product to nuclear control systems, railroad
systems, aviation systems, vehicles, combustion systems, medical equipment, amusement machines, safety equipment, and other systems or equipment that may have a serious
influence on lives and property if used improperly. Make sure that the ratings and performance characteristics of the product provide a margin of safety for the system or
equipment, and be sure to provide the system or equipment with double safety mechanisms.
OMRON Corporation
Electronic and Mechanical Components Company Contact: www.omron.com/ecb Cat. No. A252-E1-04
1017(0316)(O)
Note: Do not use this document to operate the Unit.
