MCU-88 TMD27713 ALS Infrared LED Optical Proximity Detection Module Face Proximity Detection ModuleItem NO.: MCU-88

MCU-88 TMD27713 Infrared LED Optical Proximity Detection Module

Product Information:

Module using chip: TMD27713

Detection distance: 100mm

Module name: Face proximity detection module Distance light sensor module

The ambient light+proximity sensor+infrared LED three-in-one sensor TMD2771X is mainly used in mobile phones for two purposes: on the one hand, it is used to detect the current ambient light brightness (ALS); And automatically adjusts the backlight brightness according to the current ambient light brightness status in a software adjustment manner to adapt to the ambient brightness; Softening the backlight brightness plays a role in protecting eyesight while achieving a power saving effect; Another function we call proximity sensing function (PROX) uses the reflection of infrared rays emitted by internal LEDs and the reception of the built-in PD in the sensor to determine whether the phone is close to the face during a call, thereby determining the backlight status and touch screen button status ON/OFF.

Compared to the two-in-one product TSL2771X, the big advantage of the three-in-one device TMD2771X is that it integrates an infrared emitter tube inside, without the support of external LEDs. The two in one sensor is not equipped with an LED inside and requires an external LED; This design method has no stringent requirements in the hardware/pcb part, but the power of LEDs is a relatively important issue.

Sensor consistency can be controlled during the TAOS manufacturing process. However, due to the discrete nature of LED semiconductor devices (which is an inherent characteristic), it is necessary to strictly control the power level of LEDs in actual production, which may cause some inconvenience during the production process.

In addition, the three-in-one sensor has integrated the transmitter/receiver and reduced the design, making the design and installation more space free, and the structural requirements will be relatively simple. When designing a two-in-one sensor, it is necessary to focus on the internal diffraction problem after the device is installed in the mechanism. Therefore, when designing the mechanism, it is necessary to pay attention to the separation between transmission and reception; If there are holes in the panel (including ink coated holes), it is also necessary to fully consider the hole area (mainly considering the diameter of the circular hole) and the height of the installation position from the panel surface, and based on this, determine whether to install the light guide column/installation method. The interior of the three-in-one sensor device has been isolated with stainless steel material; However, due to the small size of the sensor body (2.4 * 4.0 * 1.4) and the integrated fabrication, it is relatively difficult to implement external isolation measures. Therefore, when designing the actual structure, it is necessary to pay attention to relevant issues. Please refer to the following mechanism design recommendations for details.