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Optimising electronics At its core, a pressure sensor comprises the sensing element, processing unit and a communication module. The signal measured by the sensor will normally be in an analogue form and must be conditioned and digitised before processing or being communicated to other devices.
It is possible to obtain standard off -the-shelf ICs with the basic functionalities to perform this task of signal conversion. But for an optimised system that sets itself apart from the competition, it’s often preferable to use an Application Specifi c IC, or ASIC. An ASIC is a bespoke chip designed specifi cally for its application — in this case, its specifi c role within elements of the HVAC system. Off ering sensor-specifi c integration, ASICs off er improved performance over their commercially available alternatives as well as reduced power consumption due to performance optimisation. ASIC integration also off ers the benefi t of system
calibration. Calibrated data can be stored in onboard memory, allowing for the calibration of individual sensors and correction of raw pressure data. This ensures precise measurements even over extended operating periods and helps to maintain the effi ciency and reliability of the HVAC system overall.
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When it comes to off -the-shelf ICs, obsolescence can be an area for concern. Standard chip manufacturers may cease production at any time, whether it’s the result of a particular silicon process becoming obsolete or a signifi cant drop in IC sales volume. In contrast, ASICs are designed with non-obsolescence in mind. Choice of silicon process is made with careful consideration to the supply and longevity required by the product. And in the case that the process does become obsolete sooner, solutions will be presented to the customer in ample time to ensure a continuous supply. This could include the purchase of wafers or porting the design onto a new process altogether. Working with an experienced ASIC supplier such as Swindon means that customers are involved and guided through the decision- making process, resulting in the creation of a complete non-obsolescence plan. HVAC systems can be found in a variety of environments, be it industrial, commercial, or residential. Regardless of its fi nal installation point, it’s crucial that the HVAC system off ers the same high level of performance to whoever it serves. By optimising the design right from chip level, unit manufacturers can guarantee their system off ers a performance a cut above its competition.
Calibrated data can be stored in onboard memory, allowing for the calibration of individual sensors and correction of raw pressure data.
www.acr-news.com • February 2024 29
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