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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 isn’t 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 advantage of being less sensitive to contaminated or aggressive media and being able to measure directly at the process. In the case of sensors 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, in addition to the pressure value, a temperature value and diagnostic information (for example an integrity test of the info transfer) can be transmitted via a status byte.
ไดอะแฟรม could be connected to a bus line as ?slaves? to the client 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 since the pressure value has already been present in digital form. This plays a part in faster and easier signal processing.
pressure gauge for communication could 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 instance, this applies 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 integrated into the customer product and thus protected against external influences. It 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 undoubtedly be happy to help you with any further questions on digital interfaces.
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