I�C was made 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 use the I�C signal for data transfer, but additionally pressure sensors remote from customer electronics.
Remote sensors will often 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, oftentimes, exposed directly to the medium. With remote sensors, steel or ceramic generally serve because 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 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) could be transmitted via a status byte.
Several pressure sensors could be connected to a bus line as ?slaves? to the client electronics that functions as a ?master?.
On the customer side, in contrast to the use of 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 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 ideal for battery-powered applications. In the WIKA portfolio, for example, this applies to the MPR-1 pressure sensor module.
Hero by using I�C
Since I�C isn’t 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 the pressure sensor or the pressure sensor module is built-into the customer product and therefore protected against external influences. It should also be noted that with any digitally processed signal, the response time due to 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 further questions on digital interfaces.
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