Plessey Semiconductors PS25203 EPIC sensor

Plessey Semiconductors’ Epic sensor technology claims low-cost, reliable detection systems for several automotive applications. A lower gain and higher input impedance make it suitable for non-contact ECG measurements like driver fatigue or seat occupancy monitoring. The Epic sensor technology works by measuring tiny changes in an electric field and can even work through clothing.

In cars, Epic sensors can be used to monitor driver alertness by detecting heart rate and respiration. Determining the size and position of occupants in a car can allow for adjustments to the ride, handling and airbag deployment. The sensors can be incorporated inside the seat backs to acquire the necessary biometric data for monitoring a driver’s health.

Plessey Semiconductors’ Marketing Manager, Derek Rye, explains, “Regulations and economics has caused car designs to become very similar and manufacturers have to differentiate their products with passenger comfort features. We are only just starting to explore the new and exciting ways to use sensors to enhance and improve safety.”

Epic sensors are already in commercial production by Plessey Semiconductors. By adjusting the DSP and amplification circuitry, these sensors can be tuned for detection required for these automotive applications. The PS25203 sensor is supplied in a custom 4-pin PCB hybrid package measuring 10.5 x 10.5 x 3.45 mm.

Another application for the Epic sensor is in medical scanners. Since no physical or resistive contact is required to make measurements, simply holding a scanner close to a patient’s chest can obtain detailed ECG readings. The sensor can be integrated to provide other features for safety, security, data converters, digital signal processing and wireless communications capability.

The technology works at normal room temperatures and functions as an ultrahigh input impedance sensor that acts as a stable, sensitive, non-contact digital voltmeter to measure tiny changes in the electric field down to millivolts. Most places on Earth have a vertical electric field of about 100 volts/m. The human body interacts with the electric field and Epic technology can detect these changes at a distance and even through a solid wall.