I�C was designed to communicate over short distances between printed circuit boards and is a simple, 8-bit serial data bus. For the time being, it is not only PCB-mountable pressure sensors that use the I�C signal for data transfer, but additionally pressure sensors remote from customer electronics.
Remote sensors usually have the benefit of being less sensitive to contaminated or aggressive media and having the ability to measure directly at the procedure. 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 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 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 example an integrity test of the data transfer) can be transmitted via a status byte.
Excellent can be connected to a bus line as ?slaves? to the client electronics that functions as a ? Tremendous ?.
On the client side, in contrast 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 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 are also optimised to take 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 utmost 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. Manipulative 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 help you with any further questions on digital interfaces.
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