When it comes to MEMS sensors, the most common thing for everyone is automotive applications and other industrial applications represented by automotive airbag applications. Now, as MEMS sensors become smaller and smaller, prices are getting lower and lower, and energy efficiency is getting higher and higher. Its design and application space is also expanding, and we can already see it in more and more consumer products. Mr. Wu Weidong, Marketing Manager of Greater China, ST Simulation, Power and Micro-Electrical Systems, said at the ST seminar held in Shenzhen: MEMS technology appeared very early, because price has been difficult to enter the consumer field, is the price of ST MEMS It has become easier to push MEMS into the consumer space.
Mr. Wu said: "Two years ago, the price of the three-axis accelerometer was more than two dollars, and now ten yuan, customers can already add a three-axis accelerometer to their toy design, ST sold in 2008. MEMS sensors will reach 150 million pieces.
There are also accelerometers in six hundred non-brand phones.MEMS sensors are becoming more and more widely used in consumer products. By simply adding MEMS sensors, designers have added many features and user-friendly functions to consumer products, among which mobile phone applications are the most prominent. And with the decline in the price of MEMS sensors, Mr. Wu Weidong said: "Now many non-brand mobile phones of more than 600 yuan have also applied acceleration sensors to achieve special features." From this point of view, the reason why non-branded mobile phones can be so low prices It is not the MTK's work to have such a rich set of functions.
a. The MEMS accelerometer in the MEMS sensor mobile phone in the mobile phone makes the human-machine interface simpler and more intuitive, and the interface function can be operated by the action of the hand, which fully enhances the user experience. MEMS sensors can rotate images, videos, and web pages based on the orientation of the terminal device. By tilting the phone up and down and left and right, you can also view the phone menu; just tap the phone body to select different icons on the screen, all of which are inseparable from the advanced digital technology embedded in the new generation of MEMS devices.
Figure 1: Application of MEMS sensors in mobile phones and PDAs
b. Image Scaling and Flipping Applications With MEMS accelerometers, you can view the map in detail on a small screen and display the magnified image by tilting the device in a certain direction. MEMS can also detect the movement of the user's jittery phone and MP3 player. This simple gesture allows the player to jump to the next song or return to the previous song.
c. Mobile phone energy-saving applications Low-power MEMS motion sensors can also be used as advanced energy-saving technologies. When the mobile phone is not turned off and placed on the table, the MEMS sensor will use modules with high power consumption (such as display backlight and GPS module). All turned off to reduce the energy consumption of mobile phones and portable navigators. Just touch the body and you can turn on all functions.
d. Wake-up and gesture input applications Similarly, whenever the phone is placed face down on the desk, the phone settings will switch to silent mode; you can turn off the mute function by touching the body. We can even imagine that in the future, when the mobile phone is input, it is no longer necessary to use the buttons. Even the intimate contact between the finger and the display screen required by the touch technology is not needed. The user can write the numbers and letters in the air, and the MEMS sensor can Identify these actions, and the phone software restores these actions to numbers and letters; the software can also turn the user-defined actions into special custom functions. This is similar to Nokia's optimistic gesture input.
Figure 2: STMEMS sensor in Iphone3G
Other applications for MEMS sensorsa. Hard Drive Protection Function The hard drive fall protection function is one of the historically significant representative applications of MEMS motion sensors in the consumer electronics market. The three-axis accelerometer in the laptop can monitor the acceleration. When the acceleration vectors on the X, Y, and Z axes are zero, the laptop is considered to be in a free-fall state, so that the hard disk drive can be detected. Accidental fall and accidentally lock the hard drive in case the computer eventually damages the head when it falls on the floor.
b. Game console application game consoles are prominent representatives of motion tracking and gesture recognition applications. Take the revolutionary Nintendo Wii console as an example. The miniature motion sensor captures any subtle movements of the player and translates them into game actions. MEMS technology allows players to move: the player is immersed in the real game experience and is integrated into the game through different actions, for example, imitating a real tennis match, a fascinating golf game, a tight boxing match or a relaxed fishing The action of the game. Many engineers at the site were very interested in the sports games provided by the Wii, and the Wii's handles used ST's MEMS sensors.
c. Fitness and Health Monitoring Applications Fitness and health monitoring is another representative application of MEMS sensors. A pedometer or pedometer is a representative application that uses a three-axis MEMS sensor to perform fitness and health monitoring functions. The pedometer sensor measures acceleration by acting on the system during walking and running, and by processing acceleration data. The stepper displays the number of steps and speed the user has traveled, as well as the amount of heat consumed during physical exercise. The bodybuilder can get a timely reminder whether the amount of exercise is insufficient or excessive.
d. GPS assisted positioning application
In addition, the pressure sensor can be combined with the GPS navigator to obtain more accurate position information of the user. If we only use the GPS navigator, we may only be able to judge whether a car is driving at the coordinates of the position where an overpass is located, and it is impossible to judge whether it is driving under an overpass or an overpass. At this time, the pressure sensor is needed. If there is an emergency and need help, the rescuer can also accurately know the location and floor of the building where the trapped person is located through the pressure sensor and GPS, so as to carry out the rescue operation more efficiently.
e. Three-dimensional mouse and remote control application MEMS accelerometer and gyroscope can be used to make more advanced selection functions become reality. The seminar site shows the three-dimensional mouse and remote control that can be operated in the air. In these devices, the sensor detects the user's gestures and converts them into cursor movements on the PC screen or channel and function selections for the set top box and the television. The MEMS sensor group, two gyroscopes, and an accelerometer detect the motion of the wrist or mouse in the air, while the microcontroller performs motion tracking and gesture recognition. Then, the reorganized motion curve is sent to the set-top box or PC through the wireless connection, the wireless link can use infrared or radio frequency, and the three-dimensional mouse displayed in the field uses Bluetooth as the wireless link. Precautions for MEMS applications To use MEMS in addition to high-quality hardware, advanced and reasonable algorithms are required, as well as high requirements for PCB layout and SMD soldering. ST's FAE also made suggestions to the engineers in the speech.
Among them, the main points of PCB design are as follows:
• The area under the Sensor should be set to disable the wiring area. It is recommended that there should be no other traces or vias at the 1mm distance below and around the Sensor.
• The wiring of the connection pins should be as symmetrical as possible. This reduces the effects of shrinkage on the device after reflow.
• In order to reduce the effect of temperature on the Sensor, it is recommended not to place large connectors such as buttons/shields within 2 mm of the Sensor.
• The indicator mark on the first leg is internally connected to the first leg. When soldering, please leave the indicator mark on the first leg.
Points to note in SMT:
• Solder paste thickness and template help the sensor's proper soldering
• It is recommended to use a steel mesh when applying solder paste. λ
• The recommended stencil thickness is 90~150um (3.5~6mil).
• The thickness of the solder paste should be appropriate to ensure cleanliness and soldering between the Sensor package and the PCB.
• It is recommended that the steel mesh type be rectangular and the size is 25um (1mil) smaller than the part on the PCB.
• For signal pads, the stencil should account for 70% to 90% of the PCB pad.
• The stencil must be strictly aligned with the pins of the IC. The stencil and PCB in front of the solder paste must also have a strict alignment error of less than 25um (1mil) λ.
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