Vishay VCNL36821S IRED Integrated Proximity Sensor

4 February, 2020

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Vishay VCNL36821S IRED Integrated Proximity Sensor is fully integrated with an infrared emitter, a photodiode for proximity measurement, and a signal processing IC in a single package with a 12-bit ADC. With a range of up to 30cm (12″), this stand-alone component simplifies the use and design-in of proximity sensors as no mechanical barriers are required to optically isolate the emitter from the detector. The VCNL36821S is offered in a miniature, surface mount, 2.55mm x 2.05mm leadless package (LLP) with a low profile of 1mm. The device is designed to meet the low height requirements needed for use in smartphones, mobile phones, digital cameras, and tablet PC applications.

Features

Surface mount package type
2.55mm x 2.05mm x 1.0mm (LxWxH) in dimension
Integrated modules
- Infrared emitter (IRED)
- Proximity sensor (PS)
- Signal conditioning IC
Interrupt function
Small light hole opening design
Immunity to red glow issues (940nm)
1.7V to 3.6V supply voltage range
Low power consumption I²C (SMBus compatible interface)
168-hour floor life, MSL 3, according to J-STD-020
I²C bus (PS) output type
-40°C to +85°C temperature compensation

Specifications

Supply voltage range
- 1.7V to 3.6V sensor
- 2.5V to 3.6V IR LED
Temperature range
- -40°C to +85°C operating
- -40°C to +100°C storage

100µA to 300µA supply current
1µA (typical) shutdown current
940nm (typical) peak wavelength of IRED
156mA (maximum) IRED driving current
Lead-free, halogen-free, and RoHS compliant

With its standard I²C bus serial digital interface, easy access is allowed to the “proximity signal”. The programmable interrupt function offers wake-up functionality for the microcontroller when a proximity change occurs reducing processing overhead by eliminating the need for continuous polling. The implemented infrared emitters cathode is connected to the driver internally and does not need to be externally connected. The IRED features a peak wavelength of 940nm, emits light that reflects off an object to allow detection within 30cm of the sensor, and has a programmable drive current from 50mA to 156mA.

Block Diagram

more information: www.vishay.com

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Mike is the founder and editor of Electronics-Lab.com, an electronics engineering community/news and project sharing platform. He studied Electronics and Physics and enjoys everything that has moving electrons and fun. His interests lying on solar cells, microcontrollers and switchmode power supplies. Feel free to reach him for feedback, random tips or just to say hello :-)

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