OPERATION MANUAL
Pressure sensor module
with voltage output and I²C-bus
DescriptionDescription
Characteristic features
• Digital I²C and analogue interface 0…5 V
• Calibrated and ready-to-use
• Wide application spectrum
• Ceramic or piezo resistive measuring cells
• Environment resistant and long term stable
• Miniaturised dimensions
• Optimal price-performance ratio
• Customised product variants and OEMdesigns possible
Typical areas of application
• Building instrumentation
• Ventilation control
• Fill condition measurement
• Filter monitoring
• Automation technology
• Customised solutions
Technical Data
Pressure sensor module DRMOD-I²C
Measuring principle
Signal processing
Measuring range
Temperature compensation 0...50 °C
Accuracy
Linearity/ Hysteresis
Operating voltage
Current consumption
Temperature
application range
Voltage output 0…5 V for pressure
I²C-Interface 100 / 400 kHz, address 0x78
Electrical connection 5-pin RM 2.54mm
Media connection Hose connection 6/4 mm
CE-Conformance 20047108/EG
EMV-noise emission EN 61000-6-3:2011
EMV-noise withstanding EN 61000-6-1:2007
Pressure measuring cells,
ceramic or piezo resistive
Digital in ASIC: linearisation,
temperature compensation
See table
Piezo resistive < ± 0,3 % FSR*
Ceramics < ± 0,3 % FSR*
6…15 V
< 5 mA
-40...+100 °C
Features
The B+B pressure modules combine modern sensor technology with
exible signal processing of an ASIC.
The module has a calibrated, analoge voltage output of 0…5 V and also
a digital I²C-interface, which can directly communicate with a microcon
troller.
By a precise calibration at 7 measuring points, one can achieve an
outstanding precision and a very low temperature residual error. The
completely processed, calibrated, pressure measured values are made
ready with high resolution which makes simple integration possible with
customer specic products. The calibrated and standard output signal
guarantees simple integration of sub-system in development phase and
enables shortest time-to-market product developments. The probes are
ideally suitable for measurement of static and dynamic relative pres
sure in liquids and gases. Typical application areas emerge in the eld
of pneumatics, hydraulics as well as in industrial applications. Besides
the standard variants, customer specic models are also available
e.g. with other operating voltage, special calibration, ratiometric vol
tage output and also with digital output signal. Further information on
www.bb-sensors.com are available on enquiry!
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* Full-Scale-Range
Technical changes reserved
0141 0316-120 19.08.2015
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 8316-50 | info@bb-sensors.com | bb-sensors.com
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OPERATION MANUAL
Pressure sensor module
with voltage output and I²C-bus
Standard model
The module is congured as follows:
• Operating voltage range 6 to 15 V / 3 mA
• Calibrated at 8.0 V
• I²C Interface for pressure
• Voltage output 0...5 V
• Temperature measurement with Pt1000
Application notes
Supply with 5 V is possible, if analogue output is not used. The calib-
ration at factory is done at 8 V. The specied technical data is valid at
this operating voltage. Other congurations and special calibration as
per customer requirements are possible. While connecting the measuring probes over longer routes, the used I²C-Bus external to the device
should not be used internally, in order to avoid coupling of interferences to the device internal communication. The EMV-guidelines are to
be followed and shielded lines are recommended.
A RESET of the pressure sensor can be initiated by a short time interruption of the operating voltage. If the operating voltage can be switched off, then the pullup resistance of the I²C bus must be connected
to the switched voltage. To simplify your product development, a communication board and an USB-I²C-adapter is available. Please send
us your enquiry!
Operating voltage
Standard supply is 6 to 12 V operating voltages which are stabilised
in the module to 5 V. The 5 V operating voltage also serves as the
reference level for the digital I²C communication.
Voltage output
On PIN1, the measured pressure is given out as analoge voltage signal. The voltage range of 0...5 V represents the measuring range: 0 V
corresponds to the smallest measured value or lower limit, 5 V represents the measured range limit or upper limit.
The connection impedance should not be less than the minimum value
of 10 kΩ. The output impedance is around 50 Ω. The output is protected against short circuit transients. External voltage at the output can
lead to a damage of the ASIC and should be certainly avoided.
ble on request or can be downloaded from www.bb-sensors.com.
The standard address of the component is 0x78, the component can
always be communicated with this address. The address is to be un-
derstood as a 7 bit address, left justied and with masked R/WBit is the
Read-address 0xF1.
Additionally, a second address can also be programmed during
conguration ex factory, through which the pressure sensor can be
addressed.
From this address 0x78 (7 bit address), 2 Bytes can be read. The following assignment is applicable:
Data
0x78 Byte_0 MSB pressure
Byte_1
LSB pressure
Scaling of measured value
The pressure is transferred as 15 bit value (bit 0 –14). From the 15 bit
measured values, approx. 12 bit are used as resolution, the three least
signicant bits can be ignored.
The most signicant bit (15) is always 0 during normal operation and in
case of error, it is set to 1. Further notes on the error codes are available in the write-up “Serial Interface of B+B ASIC“.
Following scaling is applicable for the measured values:
Pressure
Numeric value over
I²C Interface
Physical value
Scaling P =V / 32768 * measuring range
0x 0000...7FFF
dec. 0...32767
as per model
Pin strip connection layout
Pin Title Function
1 OUT Voltage output
2 SDA
3 SCL Serial pulse I²C
4 GND Ground
5 VDD Operating voltage 6...12 V
Serial data I²C
I²C-Interface
The communication corresponds to the standard I²C protocol. All
technical specication of the protocol can be obtained from the documentation “Serial Interface of B+B ASIC“. The documentation is availa-
Technical changes reserved
0141 0316-120 19.08.2015
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
Fon +49 771 83160 | Fax +49 771 8316-50 | info@bb-sensors.com | bb-sensors.com
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