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 use the I�C signal for data transfer, but also 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 process. Regarding sensors mounted directly on the circuit board, the sensor element is, in many cases, exposed directly to the medium. With Impatient , 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 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 customer electronics that functions as a ?master?.
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 because the pressure value has already been present in digital form. This contributes to 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 perfect for battery-powered applications. In the WIKA portfolio, for instance, this pertains to the MPR-1 pressure sensor module.
Boundary conditions by using I�C
Since I�C isn’t a fieldbus, long wire lengths aren’t recommended. The utmost 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 therefore protected against external influences. It should also be noted that with any digitally processed signal, the response time because of 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.
Distributed Intelligence
Distributed Intelligence on the integration of pressure sensors into hydraulic systems
Fill below form and we will send you the whitepaper ?Distributed Intelligence?.
Name
Company
E-mail
Send
We?re focused on your privacy. We?ll use your details to contact you about our services and products. Contact us at socialmedia@wika.com to revoke your permission to utilize your information.