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ZOPT2201 UVB and Ambient Light Sensor for Mobile Applications


IDT Mobile Sensing presents the ZOPT2201, a UVB sensor with integrated ALS detection. Sunlight is important to our mental health. Just as overexposure can have detrimental effects on our physical well-being, underexposure can also affect our immune system as well as our mental well-being. This UVB sensor with an integrated ambient light sensor provides two benefits: The benefit of managing exposure to sunlight as well as the ability to now have a contextual awareness within the product. The ZOPT2201 UV index and ambient light sensor enables wearables such as fitness bands, smartwatches, and smartphones to differentiate by measuring UV sun exposure.

Individuals benefit by managing their time in the sun to ensure neither underexposure nor overexposure during exercise. An integrated ambient light sensor provides screen display adjustment based on the brightness of the ambient light. The IDT ALS sensitivity matches the human eye’s response to light intensity.

With the two-channel sensor, greater contextual awareness is possible by running an algorithm that measures UV light with the ALS channel enabled. Mobile products can now improve sensors, understanding of the environment, and data provided to a user such as being indoors or outdoors.

The design engineers of IDT have developed a product that enables the general public now to manage their health and well-being by monitoring and managing their time in the sun. This product can be easily integrated into a smartphone or a wearable that does not already have a [inaudible 00:01:55].

Most people will not experience a UV index as high of 11 unless they are just south of the Equator. If that is the case, the ZOPT2201 will provide accurate readings. The ZOPT2201 was built for rugged conditions with a wide-ranging temperature range, built-in temperature compensation, as well as it operates in mobile environments with a supply voltage of 1.7 volts to 3.6 volts.

A challenge when measuring UV rays is a blocking stray light that interferes with the photodiodes. The ZOPT2201 has a unique package that blocks stray light from all angles, not only the surface. The ZOPT2201 has a unique duo-filter process that not only provides for the most sensitivity but also is immune from changing angles of incidence that would impact performance.

For those customers with high volumes in the mobile industry, our platform can support different filters that detect customer-specific peak frequencies with a 10% distribution, which can be seen in both UVA and UVB wavelengths. You can see that visible light does not interfere with UV readings. We encourage engineers to shine visible light into our UV sensor and others that are on the market.

The ZOPT2201 will not respond to visible light while others on the market will show UV readings where no UV light exists. The ambient light sensor closely matches the human eye response and this can be seen on the graph. The dotted line is typical of our eye and the solo line represents data from our sensor.

Ambient light sensing measures brightness or the lux value, which adjusts screen intensity that reduces strain on the person’s eye. The ZOPT2201 provides a more enjoyable user interface with mobile devices. The design of the ZOPT2201 was deliberate to support the most accurate UV readings. Additionally, the process used was optimized for maximum sensitivity to our photodiodes.