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 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 capacity to measure directly at the procedure. In the case of sensors mounted directly on the circuit board, the sensor element is, oftentimes, 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, as well as 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 can be connected to a bus line as ?slaves? to the customer electronics that functions as a ?master?.
On the client side, as opposed to the utilization of 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 plays a part in 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 may also be optimised to consume less energy, making them perfect for battery-powered applications. In the WIKA portfolio, for instance, this applies to the MPR-1 pressure sensor module.
Boundary conditions by using I�C
Since I�C is not a fieldbus, long wire lengths are not recommended. The maximum wire length depends, in detail, 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 built-into the customer product and thus protected against external influences. Successful should 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 more questions on digital interfaces.
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