I�C was designed to communicate over short distances between printed circuit boards and is really a simple, 8-bit serial data bus. In the meantime, it isn’t only PCB-mountable pressure sensors that utilize the I�C signal for data transfer, but also pressure sensors remote from customer electronics.
Easily will often have the benefit of being less sensitive to contaminated or aggressive media and having the ability to measure directly at the process. Regarding sensors mounted directly on the circuit board, the sensor element is, in many cases, exposed directly to the medium. With remote sensors, steel or ceramic generally serve as 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 really a well-known standard in electronics, offering additional possibilities for communication with a pressure sensor than with an analogue signal:
In the data protocol, in addition to the pressure value, a temperature value and diagnostic information (for instance an integrity test of the data transfer) can be transmitted via a status byte.
Several pressure sensors could be connected to a bus line as ?slaves? to the client electronics that functions as a ?master?.
On the customer side, in contrast to the utilization 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 present in digital form. This contributes to faster and easier signal processing.
The electronics for communication can be built with standard components readily available on the market.
Often, I�C signal pressure sensors may also be optimised to take less energy, making them perfect for battery-powered applications. In the WIKA portfolio, for example, this pertains to the MPR-1 pressure sensor module.
Unhurried by using I�C
Since I�C is not a fieldbus, long wire lengths are not recommended. The maximum wire length depends, at length, 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 help you with any further questions on digital interfaces.
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Distributed Intelligence on the integration of pressure sensors into hydraulic systems
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