Infrared proximity sensor serial Si1143 of Silicon Labs Company

The electronic device detects proximity, measuring the user's distance quickly. Currently, most proximity sensors available on the market have a relatively short detection range of approximately 1 to 10 cm. The use of infrared LEDs in multipulse mode for extended periods results in significant power consumption, contributing to energy losses. Silicon Laboratories, abbreviated as Silicon Labs, has introduced a highly sensitive infrared proximity sensor known as the Si1143, based on the original Si1120 model. This sensor not only extends the detection range and reduces power consumption but also adds a communication interface via SMBus, allowing for the driving of three LEDs, thus offering greater flexibility in its application.

The Si1143 infrared proximity sensor consists of three infrared LED drivers, an infrared photodiode, an environmental photosensor, and control logic integrated into a single IC. This design allows for the external transmission of LEDs, which can be installed flexibly according to user requirements. The device can be controlled by a microcontroller (MCU) through an I2C interface. When the infrared LEDs emit light, it reflects off nearby objects and is detected by the built-in photodiode. The analog signal is then converted to a digital signal, which is compared to a predetermined threshold. If the signal exceeds this threshold, an interrupt signal is sent to the main MCU, triggering corresponding software functions.

For instance, in mobile applications, this technology allows users to zoom in or out on a map by simply moving their fingers closer or farther from the device. The Si1143 sensor, unlike competing infrared LED systems that require multiple pulses for accurate long-range measurements, employs a patented single pulse technique. This results in a remarkable 5000-fold improvement in power efficiency, significantly extending battery life. Additionally, when an object approaches or moves out of the detection range, the sensor automatically enters a low power consumption mode, with typical consumption dropping to just 20 nA. This non-contact gesture recognition technology enables users to interact with devices without physical touch, enhancing user experience across various consumer electronics, including mobile phones, computers, and other home electronic products.The electronic device feel the proximity which measures the user fast. But the distance that most proximity sensors survey is relatively short on the market at present, 1~10cm generally, and infrared rays LED whether multipulse mode for a long time launch infrared rays lead to the fact power consumption to be quite loud mainly, and contributed to the losses that to a great extent. Close sensorily to being infrared, Silicon Laboratories of U. S. A. are abbreviate as: Silicon Labs The company has put out the high sensitive infrared proximity sensor of a Si1143 on the basis of original Si1120, not only until long-range survey and the intersection of low power consumption and do well, also increase the communication interface of SMBus at the same time, take three LEDs to drive, has flexibility in employing even more. Si1143 infrared proximity sensor includes three infrared LED drivers, the infrared rays photod, it is environmental one pieces photosensor and control logic make up IC, is it external transmission LED can getting more flexible to install according to the needs of user and disposition.

As shown in Fig. 1. Welcome to reprint, this text comes from the electronic fan`s network Si1143 self-carrying three infrared LEDs is driven, top management MCU can carry on functional control to it through I2C interface, received by the Built-in: infrared rays photod after LED emissive infrared rays is through being closed to objects to reflect, then carry on analog-to-digital conversion and change the mere strong signal into the digital signal, the number value after calculating compared with threshold presumed, if exceed the threshold presumed to output the interrupt signal from INT mouth for main MCU, pass the corresponding concrete operating function of software implementation. For example, the utility program of the mobile phone may allow users to realize the scaling of the map while changing the finger to the distance of the mobile phone, or pull the function of map, etc.

While employing in the fields of consumer products, like Si1120, Si1143 infrared proximity sensor possessed two major characteristics that people pay much attention to: The not like competition scheme infrared rays LED must carry on much sub-pulse in order to reach rigorous measurement for a long time, it is close to the single pulse that the sensory series use the patent and close to measurement technique show as in Fig. 4 that Si1143 is infrared, Achievable 5000 times of improvement on power efficiency, the battery life-span can be lengthened.

In addition when the Approach Distance of object is pygmy or outside out-of-operation the detection range Can enter the low power consumption mode automatically, the typical power consumption under the low power consumption mode has 20nA only, and this is exactly portable It is that a kind of non-contact type gesture is close to the roller bearing technology that it is close to reaction that infrared, let users not need to touch actually, so long as can be handled when utilizing the simple gesture, can make the electronic device feel the proximity which measures the user fast. Multi-place of this technology is applied to many kinds of consumer-elcetronics devices, such as the mobile phone, computer and other home electronic products.

But the distance that most proximity sensors survey is relatively short on the market at present, 1~10cm generally, and infrared rays LED whether multipulse mode for a long time launch infrared rays lead to the fact power consumption to 🔗 External reference