Datasheet> 器件分类 > 开发板/开发套件/开发工具> MIKROE-2984

MIKROE-2984: 产品描述PROXIMITY 5 CLICK; 产品类别开发板/开发套件/开发工具; 文件大小733KB，共7页; 制造商MikroElektronika; 官网地址https://www.mikroe.com; 标准

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MIKROE-2984概述

PROXIMITY 5 CLICK

MIKROE-2984规格参数

参数名称	属性值
平台	mikroBUS™ Click™
类型	传感器
功能	光
使用的 IC/零件	VCNL4035X01，VSMY2850RG
内容	板

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Proximity 5 click

PID:

MIKROE-2984

Weight:

30 g

Proximity 5 click

is a very accurate and reliable proximity sensing (PS) and ambient light

sensing (ALS) device, equipped with the state-of-the-art PS and ALS sensor. The signal

processing and conditioning section, three IR LED drivers, and the low noise analog front

end with the PS and ALS photo-sensitive elements, are all integrated into the sensor IC,

ensuring very accurate and reliable readings, while reducing the workload of the host MCU.

The proprietary Filtron™ technology provides near-human

eye light spectrum sensitivity

and top-class background light cancellation scheme for the ALS section, additionally

reducing the workload of the MCU. Finally, the programmable interrupt engine reduces the

MCU workload, even more, saving the host MCU of constant polling of the sensor for data.

Another interesting feature of the Proximity 5 click is the ability to detect gestures. It is

possible to trigger an interrupt every time a gesture cycle ( one measurement per IRED)

has completed. This allows the measurements to be picked up with correct timing and

allows for the development of an accurate gesture algorithm. Rich with features, this Click

board™ can be used for a range of different applications which rely on the accurate and

reliable close proximity and ambient light sensing, such as the proximity activated

surveillance systems, equipment lid closing, screen backlight adjustments, lux meters, and

by utilizing gesture detection, it can be used for various types of simple HID interfaces.

How does it work?

Proximity 5 click features the VCNL4035X01, a fully integrated proximity and ambient light

sensor with I2C interface and the interrupt function for gesture applications, from Vishay

Semiconductors. This sensor features very advanced 16bit Ambient Light Sensor (ALS)

which

makes use of the proprietary Filtron™ technology, providing spectral response

sensitivity near to human eye. The ALS sensor also effectively cancels out infrared light, has

immunity to the flickering of fluorescent light sources and has a programmable detection

range, with the resolution of up to 0.004 lux per count.

The Proximity Sensing (PS) section of the VCNL4035X01 IC implements several solutions

for the improved proximity detection of objects of any color. It relies on detection of the

reflected IR light from the emitting LEDs. Features such as the immunity to a red glow,

intelligent crosstalk phenomenon reduction, smart persistence scheme, programmable IR

LED current, and selectable sampling resolution, help in achieving a reliable and accurate

proximity detection. The processed readings of the ALS and PS sections can be fetched from

the respective registers via the I2C interface. The I2C bus lines are routed to the respective

mikroBUS™ I2C pins: SCL is the I2C clock and SDA is the I2C data line.

The VCNL4035X01 sensor IC integrates three independent LED drivers, which can drive

the external IR LEDs with up to 200mA, allowing a wide range of external IR LEDs to be

used. Proximity 5 click uses the VSMY2850RG LEDs, 850nm IR LEDs with lenses, from

Vishay. These IR LEDs are operating within the wavelength range which is recommended

by the sensor manufacturer. The IR LEDs can be driven by the variable duty cycle, which

affects the total power consumption, as well as the PS response time.

The VCNL4035X01 sensor IC is powered by the 3.3V rail from the

mikroBUS™ directly.

However, since it uses the I2C communication protocol, it is possible to choose the voltage

for the I2C pull-up resistors between 3.3V and 5V. This is accomplished by moving the SMD

jumper labeled as VCCIO SEL to the appropriate position. This jumper allows

communication with both 3.3V and 5V MCUs.

Proximity 5 click offers programmable interrupt engine. The INT pin is routed to the

mikroBUS™

INT pin and it is pulled up by the onboard resistor. When asserted, it is driven

to a LOW logic level. The interrupt can be programmed for a wide range of events for both

ALS and PS sections: ALS threshold window with two 16bit values for the upper and lower

threshold levels, ALS Persistence which affects the integration time before an interrupt is

triggered. The PS section offers similar interrupt sources, with the addition of the object

detection which triggers an interrupt if the object is detected and PS Active Force mode.

This last mode is used when more conservative power consumption is required, as it

allows one reading to be made, before reverting back to the standby mode. When the

interrupt event occurs, a flag is set in the status register.

To detect a gesture, the Gesture Enable bit has to be set, and the sensor has to be

configured to work in the PS Active Force mode. When a trigger bit for the reading is set, all

three LEDs will be sequentially triggered. The result will be flagged by the gesture data

ready flag and the data can be read from the appropriate register. Also, the interrupt line

can be asserted if set so.

The provided library offers functions used to read the data and configure the Proximity 5

click in an easy way. The provided example application demonstrates using these functions.

It can be used as a reference for a custom design.

Specifications

Type

Proximity

Proximity activated surveillance systems, equipment lid closing,

screen backlight adjustments, lux meters, etc.

Applications

MIKROE-2984

MIKROE-2984在线购买

MIKROE-2984概述

MIKROE-2984规格参数

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