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 utilize the I�C signal for data transfer, but also pressure sensors remote from customer electronics.
Remote sensors usually have the benefit of being less sensitive to contaminated or aggressive media and having the ability to measure directly at the procedure. In the case of sensors mounted on the circuit board, the sensor element is, in many cases, exposed right to the medium. With remote sensors, steel or ceramic generally serve as the wetted surface.
I�C circuit
The I�C bus, alongside the two 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 having 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 data transfer) can be transmitted with a status byte.
Several pressure sensors could be linked to a bus line as ?slaves? to the client electronics that functions as a ?master?.
On the client side, in contrast 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 present in digital form. This contributes to faster and easier signal processing.
The electronics for communication could be built with standard components easily available on the market.
Often, I�C signal pressure sensors are also optimised to consume less energy, making them perfect for battery-powered applications. In the WIKA portfolio, for instance, this pertains to the MPR-1 pressure sensor module.
Boundary conditions with the use of I�C
Since I�C is not a fieldbus, long wire lengths aren’t recommended. The utmost wire length depends, at length, on the operating environment and the corresponding disturbing influences. I�C communication is best 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 because of discrete-time sampling will undoubtedly be somewhat slower than for an analogue, continuous signal.
Note
Your contact person will undoubtedly be happy to assist you to with any further questions on digital interfaces.
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