For 25 years we have been developing and supplying world class solutions for the automotive Tyre Pressure Monitoring Systems (TPMS) market resulting in being the global leader where we now supply over 50% of the global OEM demand for these ASIC/MEMS solutions. We have taken this design excellence and innovation and applied it to industrial and medical pressure sensing applications.
Better by Design
Pressure sensors tend to be located in difficult environments, as per the TPMS ICs, but are expected to perform accurately and without operational failure for many years. A Swindon custom ASIC/MEMS design ensures there is no compromise in accuracy or performance over temperature for the lifetime of the product.
One of the Swindon approaches is to integrate a MEMS pressure sensor with a bespoke mixed signal ASIC that comprises precise analogue circuitry with a microcontroller and programmable software. Each MEMS sensor is pressure calibrated to its ASIC over temperature with the calibrated data being stored in chip memory. The resultant accurate pressure measurement is then sent by either wirless or wired transmission protocols, dependent upon the customer’s requirements.
As required in our TPMS family, we have to meet the requirement of a 10 year operational life span, powering a MEMS pressure sensor, microprocessor and RF transmitter from a single cell lithium button battery. This requires ultra-low power consumption, nominally microwatts. Swindon is a global leader in the design of ulta-low power circuitry and we have and continue to deliver hundreds of millions of devices across the globe to leading OEMs. Every 1.5 seconds a car leaves the production line which are currentlyis fitted and benefits from this technology.
Production Test and Calibration
The production test and the calibration of the MEMS pressure sensor to the ASIC over temperature is a key element in ensuring the accuracy of the data outputted from the device. By integrating the sensor and ASIC in one package, it’s possible to simultaneously calibrate the sensor and electronics of the ASIC, thus increasing efficiency and saving time and cost at the final system manufacture at our customer.