89BSD Digital Output
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Stainless Steel with O-Ring Seal
Pressure/Temperature Read-Out
Digital Output (24-bit DS ADC)
ASIC Calibrated
Absolute, Sealed Gage
9mm Diameter
DESCRIPTION
The 89BSD is a 9mm diameter small profile, media compatible, piezoresistive silicon pressure sensor packaged
in a 316L stainless steel housing. This low power 24-bit DS ADC digital output pressure sensor supports an I2C
interface protocol and is designed for threaded o-ring mounting. A custom ASIC is used for temperature
compensation and offset correction. The sensing package utilizes silicone oil to transfer pressure from the 316L
stainless steel diaphragm to the sensing element. A flex cable allows the 89BSD to connect to a smaller
connection terminal where size is of primary concern.
The 89BSD is designed for high performance, low pressure applications.
For a similar sensor with a plastic threaded fitting, refer to the LM pressure transducer.
FEATURES APPLICATIONS
Threaded/Weldable
Level Controls
I2C Interface
Tank Level Measurement
Low Power: <1μA
Corrosive Fluids and Gas Measurement Systems
Standby Power: <0.15μA
Sealed Systems
Supply Voltage: 1.8 to 3.6Vdc
Manifold Pressure Measurement
Barometric Pressure Measurement
Dive Computers
STANDARD RANGES
Range
BarA
BarS
0 to 006
0 to 012
0 to 018
0 to 028
0 to 030
Intermediate pressure ranges available, contact factory
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PERFORMANCE SPECIFICATIONS
Supply Voltage: 3Vdc
Ambient Temperature: 25°C (unless otherwise specified)
PARAMETERS
MIN
TYP
MAX
UNITS
NOTES
ADC
24
bit
Input Voltage Range
1.8
3.6
V
2
Supply Current
See Table 1
mA
Pressure Resolution
See Table 3
%Span
3
Pressure Accuracy
±0.3
%Span
Total Error Band
See Graph 1
%Span
Conversion Time
See Table 2
ms
3
Long Term Stability
±0.2
%Span/yr
Compensated Temperature
-20
+85
°C
Temperature Resolution
See Table 3
°C
Temperature Accuracy
-2
+2
°C
Operating Temperature
-40
+85
°C
Storage Temperature
-40
+125
°C
Pressure Overload
2X
Rated
4
Pressure Burst
3X
Rated
5
Interface Type
I2C
6
Media, Pressure Port
Liquids and gases compatible with 316/316L Stainless Steel
Notes
1. Coefficients must be read by microcontroller software and are to be used in a mathematical calculation for converting D1 and D2 into
compensated pressure and temperature values. For calculation methods and coefficients, see application note APP-01006.
2. Output is not ratiometric to supply voltage.
3. Oversampling ratio: 256 / 512 / 1024 / 2048 / 4096. See Table 2.
4. 2X or 400psi, whichever is less. The maximum pressure that can be applied without changing the transducer’s performance or
accuracy.
5. 3X or 600psi, whichever is less. The maximum pressure that can be applied to a transducer without rupture of either the sensing
element or transducer.
6. Output protocol is I2C only. CSB is tied to GND, setting I2C address: 1110111
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Table 1: Supply Current Characteristics
PARAMETERS
Symbol
Conditions
MIN
TYP
MAX
UNITS
Supply Current
(1 Sample per second)
IDD
OSR 4096
2048
1024
512
256
12.5
6.3
3.2
1.7
0.9
μA
Peak Supply Current
During
Conversion
1.4
mA
Standby Supply Current
@ 25°C
0.02
0.14
μA
Table 2: Analog Digital Converter (ADC)
PARAMETERS
Symbol
Conditions
MIN
TYP
MAX
UNITS
Conversion Time
tC
OSR 4096
2048
1024
512
256
7.40
3.72
1.88
0.95
0.48
8.22
4.13
2.08
1.06
0.54
9.04
4.54
2.28
1.17
0.60
ms
Table 3: Typical Resolution
OSR
Typical Pressure Resolution
(%Span)
Typical Temperature Resolution
(°C)
4096
0.0015
0.002
2048
0.0025
0.003
1024
0.003
0.005
512
0.005
0.008
256
0.008
0.012
Graph 1:
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PERFORMANCE SPECIFICATIONS
89BSD Digital Output
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BLOCK DIAGRAM
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RECOMMENDED WRENCH DIMENSIONS
ORDERING INFORMATION
NORTH AMERICA
EUROPE
ASIA
Measurement Specialties
45738 Northport Loop West
Fremont, CA 94538
Tel: 1-800-767-1888
Fax: 1-510-498-1578
Sales: pfg.cs.amer@meas-spec.com
Measurement Specialties
(Europe), Ltd.
26 Rue des Dames
78340 Les Clayes-sous-Bois, France
Tel: +33 (0) 130 79 33 00
Fax: +33 (0) 134 81 03 59
Sales: pfg.cs.emea@meas-spec.com
Measurement Specialties
(China), Ltd.
No. 26 Langshan Road
Shenzhen High-Tech Park (North)
Nanshan District, Shenzhen 518057
China
Tel: +86 755 3330 5088
Fax: +86 755 3330 5099
Sales: pfg.cs.asia@meas-spec.com
The information in this sheet has been carefully reviewed and is believed to be accurate; however, no responsibility is assumed for
inaccuracies. Furthermore, this information does not convey to the purchaser of such devices any license under the patent rights to the
manufacturer. Measurement Specialties, Inc. reserves the right to make changes without further notice to any product herein.
Measurement Specialties, Inc. makes no warranty, representation or guarantee regarding the suitability of its product for any particular
purpose, nor does Measurement Specialties, Inc. assume any liability arising out of the application or use of any product or circuit and
specifically disclaims any and all liability, including without limitation consequential or incidental damages. Typical parameters can and do
vary in different applications. All operating parameters must be validated for each customer application by customer’s technical experts.
Measurement Specialties, Inc. does not convey any license under its patent rights nor the rights of others.
89BSD - 012BA - A
Model
Pressure Range
Type (A = Absolute, S = Sealed Gage)
Fitting Type (See Table 4)
