I�C was designed to communicate over short distances between printed circuit boards and is 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 will often have the advantage of being less sensitive to contaminated or aggressive media and having the ability to measure directly at the procedure. Regarding sensors mounted 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 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 info protocol, in addition to the pressure value, a temperature value and diagnostic information (for instance 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 client electronics that functions as a ?master?.
On the customer 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 is already present in digital form. This contributes to faster and easier signal processing.
The electronics for communication can be built with standard components readily available on the market.
Often, I�C signal pressure sensors may also be optimised to consume 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 isn’t a fieldbus, long wire lengths aren’t recommended. เครื่องมือวัดpressure 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 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 because of discrete-time sampling will be somewhat slower than for an analogue, continuous signal.
Note
Your contact person will undoubtedly be happy to assist you to with any more questions on digital interfaces.
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