I�C was made to communicate over short distances between printed circuit boards and is a simple, 8-bit serial data bus. In the meantime, it is not only PCB-mountable pressure sensors that use the I�C signal for data transfer, but additionally pressure sensors remote from customer electronics.
Remote sensors will often have the advantage of being less sensitive to contaminated or aggressive media and to be able to measure directly at the process. Regarding sensors mounted directly on the circuit board, the sensor element is, in many cases, exposed right to the medium. With remote sensors, steel or ceramic generally serve because the wetted surface.
I�C circuit
The I�C bus, alongside both supply lines, requires only two further lines:
SCL (serial clock line)
SDA (serial data line)
Additional possibilities through I�C
The I�C bus is a well-known standard in electronics, offering additional possibilities for communication with a pressure sensor than with an analogue signal:
In the info protocol, in addition to the pressure value, a temperature value and diagnostic information (for example an integrity test of the info transfer) can be transmitted via a status byte.
Ruthless can be linked to a bus line as ?slaves? to the client electronics that functions as a ?master?.
On the customer side, as opposed to the use of pressure sensors with analogue signals, the analogue-to-digital conversion of the pressure value for further signal processing is unnecessary since the pressure value has already been within digital form. This contributes to faster and easier signal processing.
The electronics for communication could be constructed with standard components easily available on the market.
Often, I�C signal pressure sensors are also optimised to take less energy, making them perfect for battery-powered applications. In the WIKA portfolio, for instance, this applies to the MPR-1 pressure sensor module.
Tease by using I�C
Since I�C is not a fieldbus, long wire lengths are not recommended. The utmost wire length depends, in detail, on the operating environment and the corresponding disturbing influences. I�C communication is most beneficial used in projects where in fact the pressure sensor or the pressure sensor module is integrated into the customer product and thus protected against external influences. It will also be noted that with any digitally processed signal, the response time due to discrete-time sampling will be somewhat slower than for an analogue, continuous signal.
Note
Your contact person will be happy to assist you to with any more questions on digital interfaces.
Distributed Intelligence
Distributed Intelligence on the integration of pressure sensors into hydraulic systems
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