I�C was made 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.
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 Outstanding mounted 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 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 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 linked to a bus line as ?slaves? to the customer electronics 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 because the pressure value is already present in digital form. This plays a part in faster and easier signal processing.
Greedy for communication can be built with standard components easily available on the market.
Often, I�C signal pressure sensors may also be optimised to take less energy, making them ideal for battery-powered applications. In the WIKA portfolio, for example, this pertains 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 most beneficial 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. 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
Your contact person will be happy to assist you to with any further questions on digital interfaces.
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