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UV sensor packs analog voltage output in a single chip

Posted: 26 Apr 2007 ?? ?Print Version ?Bookmark and Share

Keywords:UV sensor? analog voltage output? optical cut filter?

Oki Electric Industry Co. Ltd announced it has commercialized the ML8511 UV sensor IC that has an analog voltage output and does not require an optical cut filter.

Conventional UV sensors use compound semiconductors such as GaN, making it difficult to mount peripheral circuits on a single chip. In addition, because silicon-based UV sensors require an optical wavelength cut filter, problems such as piece-to-piece variation in sensor characteristics and decline in sensitivity can occur.

By adding a built-in operational amplifier, the ML8511 enables analog voltage output function on a single chip. The optical cut filter can also be eliminated, enabling manufacturers to develop small and high-mobility UV devices at a low cost. In addition, because Oki's UV sensor IC uses SOI-CMOS technology, which enables easy integration, it is well-suited to usage in mounting digital and analog circuits.

Designed for use in portable UV meters, the ML 8511 is packed in 4-by-3-by-0.7mm 12-pin QFN and features a sensitivity wavelength of 35nm, power voltage of 2.7-3.6V and consumption current of 300?a when operating and 0.1?a on standby.

"OKI has been researching thin-film SOI-based UV sensor ICs with high accuracy and that are easy to embed into mobile devices," said Takaki Yamada, president of the silicon micro device company at Oki. "Leveraging the feature of mounting digital or analog circuits, Oki will enhance its product lineup with digital output circuits that connect to MCUs and combine ambient light sensor into a single chip. OKI will provide this configuration for a wide range of applications, including accessory-type devices to measure the amount of UV in daylight, check UV exposure, and also for home and mobile appliances."

Sample shipment is scheduled in June and volume shipment in December. Samples will be priced at $2.53 each.

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