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Light/proximity sensor touts power-saving interrupt function

Posted: 01 Mar 2012 ?? ?Print Version ?Bookmark and Share

Keywords:optical sensor? proximity? signal processing? interrupt function?

Vishay Intertechnology Inc. has announced the VCNL4010 that combines an infrared emitter and photo-pin-diode for proximity, ambient light detector, signal processing and a 16bit ADC in a 3.95 x 3.95 x 0.75mm leadless (LLP), surface-mount package. The company said the space-saving device supports an I2C bus communication interface and simplifies window and sensor design for many consumer and industrial applications.

The VCNL4010's interrupt function enables the sensor to work independently until a predefined proximity or ambient light event occurs, and then it wakes up the MCU. This helps customers reduce their software effort, and lower power consumption by eliminating polling communication traffic between the sensor and MCU, stated the company.

For mobile devices such as smartphones, touch phones, PDAs, GPS units and digital cameras, in addition to computing and industrial devices and displays, the VCNL4010 saves power as a proximity sensor for touchscreen locking and serves as an integrated ambient light function for display/keypad contrast control and dimming. Containing all the circuitry needed for these applications in one device, the VCNL4010 eliminates the need for mechanical light barriers and optical alignment of the IR emitter and photo diode.

The sensor's 16bit effective resolution for proximity detection ensures excellent cross talk immunity. While other products only achieve object detection up to 100mm, the VCNL4010's programmable LED drive current from 10-200mA (in 10mA steps) allows distances up to 200mm. The device offers excellent ambient light suppression by modulating the infrared emitter signal.

The VCNL4010's built-in ambient light photo-pin-diode offers sensitivity close to that of the human eye, with a 16bit dynamic range for ambient light detection from 0.25lux to 16klux. The sensor offers 100Hz and 120Hz flicker noise rejection.

Featuring low stand-by current consumption of 1.5?A, the device offers a supply voltage range of 2.5-3.6V and I2C bus voltage range from 1.7-5V. The sensor provides a Moisture Sensitivity Level (MSL) of 3 and operates from -25C to 85C. The VCNL4010 is compliant to RoHS directive 2002/95/EC and WEEE 2002/96/EC, free of halogens and compatible with lead-free soldering.

Samples and production quantities of the VCNL4010 are available with a lead time of eight weeks for large orders. Demo kits are also available for quick proof of concept.

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