Pressure sensor with I�C communication ? possibilities and boundary conditions

I�C was made to communicate over short distances between printed circuit boards and is really a simple, 8-bit serial data bus. For the time being, it is not only PCB-mountable pressure sensors that utilize the I�C signal for data transfer, but additionally pressure sensors remote from customer electronics.
Remote sensors usually have the benefit of being less sensitive to contaminated or aggressive media and to be able to measure directly at the process. Regarding Priceless mounted 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 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 a well-known standard in electronics, offering additional possibilities for communication with a pressure sensor than having an analogue signal:
In the info protocol, as well as the pressure value, a temperature value and diagnostic information (for instance an integrity test of the data transfer) could be transmitted with a status byte.
Several pressure sensors could be connected to a bus line as ?slaves? to the customer electronics that functions as a ?master?.
On the client side, as opposed to using pressure sensors with analogue signals, the analogue-to-digital conversion of the pressure value for further signal processing is unnecessary because the pressure value is already within digital form. This contributes to faster and easier signal processing.
The electronics for communication could be constructed with standard components readily available on the market.
Often, I�C signal pressure sensors are also optimised to consume less energy, making them ideal for battery-powered applications. In the WIKA portfolio, for example, this pertains to the MPR-1 pressure sensor module.
Humor with the use of I�C
Since I�C isn’t a fieldbus, long wire lengths aren’t recommended. The maximum wire length depends, in detail, on the operating environment and the corresponding disturbing influences. I�C communication is most beneficial used in projects where 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 undoubtedly be somewhat slower than for an analogue, continuous signal.
Note
Your contact person will be happy to assist you to with any further questions on digital interfaces.
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