Datasheet

DATA SHEET
Technical changes reserved
0141 0316-180 04/2014
Temperature module
with Voltage-Output and I²C-Bus
Voltage output
At PIN6, the measured temperature is delivered as an analog voltage
signal 0 … 5 V. The displayed measuring range of 0 ... 5 corresponds
to –32 °C ... Fullscale.
The minimum connection impedance should not be less than 10 kΩ.
The output impedance is of the order of 50 Ω. The output is protected
against short time transients. External voltage at the output can cause
a damage of the ASIC and is absolutely to be avoided.
I²C-Interface
The default address of the component is 0x78 and the component
can always be communicated at this address. In addition, a second
address can also be programmed during conguration at works, under
which the humidity probe can be addressed.
Up to 4 bytes can be read at the address 0x78. If temperature values
are not required, it is enough to read only the rst two bytes.
The following allocation is adopted:
Scaling of measured value
Both humidity and temperature values are transferred as 15 bit values
(bit 0 … 14). From the 15 bit measured value, maximum 14 bit resoluti-
on is to be used, hence the least signicant bit can be ignored.
Under normal operation, the most signicant bit (15) is always 0 and
in case of error, it is set to 1. Further details on error codes can be
obtained from the document "Serial interface of HYGROSENS ASIC".
Standard model
The module has a 6-pole plug connector. The model available ex-stock
is congured as follows:
• Operating voltage range 6 … 24 V
• I²C Interface for temperature depending on type
-32 ... +96 °C, -32 ... +224 °C, or -32 ... +480 °C
• Voltage output 0 … 5 V corresponding to –32 °C ... Fullscale
• Module without housing with contact strip with 6 pins
Product variants
Besides the product variant as unpackaged module, a variety of cus-
tomer specic models are also available e.g. in stainless steel housing
with protection tube, with M12 plug connectors or with ready made
connection lead.
The following overview describes the possible options and design vari-
ants. Please send us your enquiry for the desired model!
Housing and connection cable
• Unpackaged module, dimensions 37 x 9 mm
• In stainless steel housing Ø 12 x 90 mm
with protection tube Ø 4 mm and connection cable 3 m
The protection tube can be used as immersed probe, air probe or in-
sert probes. The connection cable can be made up either with loose
strands at the end or tted with any type of plug.
Operating voltage
Standard system is with 6 … 24 V DC operating voltage which ist sta-
bilized in the module on 5 V. The 5 V operating voltage serves also as
reference level for the digital I²C-communication.
Special variants for 2.7 … 5.5 V digital communication are available
on request.
Calibration
In standard practice, the modules are calibrated as per Pt1000 resis-
tance characteristics. For higher accuracy requirements, the calibra-
tion of housed module is possible in temperature bath or calibrator,
in which up to 3 temperature points are supported. According to the
model, system accuracy of up to 0.05 °C is possible, for example, for
medical thermometers.
Data
0 x 78
Byte_0 MSB PT1000 Temperature
Byte_1 LSB PT1000 Temperature
Connector conguration
Pin 1 of the pin strip is marked with a white spot.
6-pole pin strip
1
VDD Supply Voltage +6 ... 24 V DC
2
GND Ground
3
SDA Serial Data I²C
4
SCL Serial Clock I²C
5
V_TEMP Temperature Voltage Output
6
GND Ground
The standard calibration of Temperature signals V_TEMP (PIN6)
is 0 ... 5 V.
B+B Thermo-Technik GmbH | Heinrich-Hertz-Straße 4 | D-78166 Donaueschingen
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