Sensors

Biosensor solution’s low power allows long operating time

27th August 2021
Mick Elliott

In stock at distributor Digi-Key is ams’ AS7038RB biosensor solution which is based on photoplethysmography (PPG) and electrocardiogram (ECG).

PPG is the most used HRM method, which measures pulse rate by sampling light modulated by the blood vessels, which expand and contract as blood pulses through them.

PPG is also used to measure blood oxygen saturation (SpO2). ECG is the reference for any measurement of the biopotential generated by the heart.

Embedded ECG analogue front end satisfies IEC 60601-2-47 requirements.

The solution includes LED drivers, photo-sensor, analogue front-end (AFE), sequencer, and application software.

In addition, the device also enables skin temperature and skin resistivity measurements by providing interfaces to external sensors.

Compared to ams’ previous generation, AS7038RB has a 250% larger photodiode with lower LEDs driving current to achieve the high PPG performances.

The AS7038RB’s low-power design and small form factor are particularly well suited to application in earbuds, fitness bands, smartwatches, sports watches, and smart patches in which board space is limited and in which users look for extended, multi-day intervals between battery recharges.

The thin package dimension makes the AS7038RB suitable for height constrained solution likes earbuds or smart patches.

The photodiode filter centred on red and infrared wavelengths and embedded ADC make the AS7038RB suitable for disposable pulse oximeter solutions. It addresses all skin types, and allows smallest application size, e.g., narrow HRM measurement band.

The device has an integrated optical interference filter. Low power enables a long operating time, and it works reliably with ambient light.

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