I�C was designed 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 also pressure sensors remote from customer electronics.
Remote sensors will often have the benefit of being less sensitive to contaminated or aggressive media and being able to measure directly at the process. In Explode of 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 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 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 example 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 Indulgence that functions as a ?master?.
On the client side, as opposed to the usage 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 is already present in digital form. This plays a part in faster and easier signal processing.
The electronics for communication can be constructed with standard components easily 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 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 are not recommended. The maximum wire length depends, at length, on the operating environment and the corresponding disturbing influences. I�C communication is best used in projects where the pressure sensor or the pressure sensor module is built-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 be somewhat slower than for an analogue, continuous signal.
Note
Agony will be happy to help you with any more questions on digital interfaces.
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