The **ALTG-B14-R** is a high-performance, ultra-compact optical sensor module, typically categorized as a **Surface Mount Device (SMD)**. It is widely used in proximity sensing, gesture recognition, and light detection applications. --- ## 1. Core Specifications The ALTG-B14-R integrates several electronic components into a single miniaturized package. Below are its primary technical characteristics: | Parameter | Specification | | :--- | :--- | | **Component Type** | Optical Proximity / Ambient Light Sensor | | **Package Size** | Ultra-small (e.g., 2.0 x 1.0 mm approx.) | | **Light Source** | Integrated Infrared (IR) LED | | **Receiver** | Photodiode with specialized IC | | **Output Type** | Digital (usually via I2C interface) | | **Supply Voltage** | 1.7V to 3.6V (standard range) | --- ## 2. Key Internal Electronic Parts The module is a System-in-Package (SiP) consisting of three main functional blocks: ### A. The Infrared (IR) Emitter * **Function:** This is a Light Emitting Diode that pulses light in the infrared spectrum (invisible to the human eye). * **Role:** It acts as the "transmitter." When an object comes close to the sensor, the IR light bounces off the object and returns to the module. ### B. The Photodetector (Receiver) * **Function:** A high-sensitivity photodiode tuned to the same wavelength as the IR emitter. * **Filters:** It often includes an **IR-rejection filter** for ambient light sensing, allowing the device to distinguish between background sunlight and the reflected IR signal. ### C. The ASIC (Application Specific Integrated Circuit) * **Signal Processing:** Converts the analog current from the photodiode into digital data. * **ADC (Analog-to-Digital Converter):** Usually a 16-bit or higher converter for high-resolution distance or light measurements. * **Control Logic:** Manages the timing of the IR pulses and handles communication with the host microcontroller (MCU). --- ## 3. Pin Configuration & Interfacing While specific pinouts can vary by manufacturer variants, the ALTG-B14-R generally follows this standard digital layout: 1. **VDD:** Power supply input. 2. **GND:** Ground reference. 3. **SDA:** I2C Serial Data line for communication. 4. **SCL:** I2C Serial Clock line. 5. **INT:** (Optional) Interrupt pin to wake the MCU when a proximity event occurs. --- ## 4. Typical Applications Because of its small footprint and low power consumption, it is found in: * **Smartphones:** To turn off the screen when the phone is held to the ear. * **Wearables:** For power management and screen brightness adjustment. * **Laptops:** Detecting user presence to lock or unlock the system.