Smart Sensing & IoT Solution

Application

Description

Optical sensor solution for proximity detection, ambient light sensing, and gesture recognition

Core Advantages

Integrated solution reduces BOM complexity

Proven performance in smartphone applications

Flexible configuration for various use cases

Excellent supply stability from Lite-On

Comprehensive technical support from BeiLuo

Recommended Bill of Materials (BOM)

Item	Part Number	Description	Quantity	Datasheet
1	LTR-659PS	Proximity Sensor with VCSEL	1	📄 Download
2	LTR-506ALS	Ambient Light Sensor	1	📄 Download
3	Microcontroller	I2C host controller	1	📄 Download
4	Resistor 10k	Pull-up resistor	4	📄 Download

Technical Specifications

Proximity Range

Up to 100mm

A L S Resolution

16-bit

Interface

I2C (up to 400kHz)

Supply Voltage

2.4V to 3.6V

Operating Current

<100μA typical (ALS)

Standby Current

<1μA

Package

Compact SMD

Customer Success Stories

Smart Home Device Maker

Challenge

Needed compact proximity and light sensing for smart thermostat

Solution

Implemented LTR-659PS and LTR-506ALS with integrated algorithm

Results

FAE Expert Insights

FAE Expert

Field Application Engineer

Professional Insights

Ready to Implement This Solution?

Contact our FAE team for design support and quotes

Frequently Asked Questions

What is the detection range for proximity sensors?

Detection range depends on sensor type and optical design. standard proximity sensors achieve 30-60mm range. High-power VCSEL-based sensors (LTR-659PS) can reach 100mm. Range is affected by target reflectivity, ambient light, and mechanical design.

Select sensor based on required detection distance. Consider target characteristics and mechanical constraints.

How do I integrate the I2C interface?

Lite-On optical sensors use standard I2C interface (100-400kHz). Integration requires: Pull-up resistors (4.7-10kΩ) on SDA/SCL, proper I2C address configuration, interrupt pin connection for event notification, and appropriate register configuration for application.

Use standard I2C driver. implement interrupt handling for efficient operation. reference driver code available from BeiLuo.

What power consumption can I expect?

Power consumption varies by mode: ALS only ~50-100μA, Proximity measurement ~1-3mA (pulsed), Standby <1μA. Average power depends on measurement frequency. Low-power modes available for battery applications.

Optimize measurement rate for power budget. use standby mode when sensing not needed. contact FAE for power optimization guidance.

How does ambient light affect proximity detection?

Strong ambient light (especially IR from sunlight) can affect proximity accuracy. Lite-On sensors include ambient light rejection. Proper optical design (baffles, filters) improves performance. Dynamic range adjustment helps in varying light conditions.

Consider worst-case ambient light conditions. implement optical baffles if needed. test in actual use environment.

What mechanical design considerations are important?

Mechanical design impacts performance: Window material must transmit IR (for proximity), minimize air gap between sensor and window, prevent light leakage between TX and RX, consider dust and moisture protection, ensure consistent mechanical alignment.

Follow mechanical design guidelines. use recommended window materials. test with production mechanical design.

What support is available for algorithm development?

BeiLuo Electronics provides: Reference code for basic operation, proximity detection algorithms, ALS lux calculation, gesture recognition examples, and custom algorithm development support. Application notes cover common use cases.

Start with reference code. customize for specific application needs. contact FAE for algorithm optimization.