89BSD
Digital Output
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 I
2
C
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
Threaded/Weldable
I
2
C Interface
Low Power: <1μA
Standby Power: <0.15μA
Supply Voltage: 1.8 to 3.6Vdc
APPLICATIONS
Level Controls
Tank Level Measurement
Corrosive Fluids and Gas Measurement Systems
Sealed Systems
Manifold Pressure Measurement
Barometric Pressure Measurement
Dive Computers
STANDARD RANGES
Range
0 to 006
0 to 012
0 to 018
0 to 028
0 to 030
BarA
BarS
Intermediate pressure ranges available, contact factory
89BSD
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June 2014
89BSD
Digital Output
PERFORMANCE SPECIFICATIONS
Supply Voltage: 3Vdc
Ambient Temperature: 25°C (unless otherwise specified)
PARAMETERS
MIN
ADC
Input Voltage Range
Supply Current
Pressure Resolution
Pressure Accuracy
Total Error Band
Conversion Time
Long Term Stability
Compensated Temperature
Temperature Resolution
Temperature Accuracy
Operating Temperature
Storage Temperature
Pressure Overload
Pressure Burst
Interface Type
Media, Pressure Port
IC
Liquids and gases compatible with 316/316L Stainless Steel
2
TYP
MAX
24
3.6
UNITS
bit
V
mA
%Span
%Span
%Span
ms
%Span/yr
NOTES
2
3
1.8
See Table 1
See Table 3
±0.3
See Graph 1
See Table 2
±0.2
-20
See Table 3
-2
-40
-40
3
+85
+2
+85
+125
2X
3X
°C
°C
°C
°C
°C
Rated
Rated
4
5
6
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 sensi ng
element or transducer.
2
2
6. Output protocol is I C only. CSB is tied to GND, setting I C address: 1110111
89BSD
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June 2014
89BSD
Digital Output
Table 1:
Supply Current Characteristics
PARAMETERS
Symbol
Conditions
OSR
4096
2048
1024
512
256
MIN
TYP
12.5
6.3
3.2
1.7
0.9
1.4
0.02
MAX
UNITS
Supply Current
(1 Sample per second)
I
DD
μA
Peak Supply Current
Standby Supply Current
During
Conversion
@ 25°C
mA
0.14
μA
Table 2:
Analog Digital Converter (ADC)
PARAMETERS
Symbol
Conditions
OSR
4096
2048
1024
512
256
MIN
7.40
3.72
1.88
0.95
0.48
TYP
8.22
4.13
2.08
1.06
0.54
MAX
9.04
4.54
2.28
1.17
0.60
UNITS
Conversion Time
t
C
ms
Table 3:
Typical Resolution
OSR
4096
2048
1024
512
256
Typical Pressure Resolution
(%Span)
0.0015
0.0025
0.003
0.005
0.008
Typical Temperature Resolution
(°C)
0.002
0.003
0.005
0.008
0.012
Graph 1:
89BSD
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June 2014
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