Smart bracelet, as a more popular form of products in the past two years, more and more people's attention, while also making the electronic products market has undergone some changes.
A smart Bracelet usually consists of RF unit, clock circuit, memory circuit unit circuit unit, sensor circuit unit and MCU control unit and other components, and the circuit of PCB are usually concentrated in a small range, for single or double sided patch, circuit board for 4 or 6 for the lord.
Since so many functions focus on a smaller PCB board, then we should pay special attention to the layout and routing of the bracelet, and now sum up some considerations for your reference.
PCB each part of the circuit partition layout, pay attention to line protection
From the PCB circuit board above can be seen in various parts of the circuit of smart Bracelet (different color box mark) have a good partition: because the smart bracelet is a digital circuit elements together in circuit design as long as the good resistance and capacitance distribution matching, circuit module can complete some functions, which makes the circuit design more concise and easy to find.
Although some sensor circuit units use analog circuit technology for data acquisition, once the module is designed as a module, then through the corresponding connection interface to complete data communication and information transmission.
In the circuit layout, on the one hand need to pay attention to the clock circuit and oscillator circuit through the shortest path to reach the goal of discipline, on the other hand, the clock line must pay attention to avoid the data line, to prevent interference affects the stability of the system.
In the line, the need for the protection of key line, such as clock generation circuit, crystal oscillator circuit etc. are copper protection, whether ring protection, generally in the design of protection, for part of the crystal is to dig copper processing.
RF circuit handled in PCB design
Smart Bracelet in use, and mobile phones need to link, so the radio frequency part is the key part, in this part of the design must pay special attention to. Now the smart bracelet on the market is nothing more than Bluetooth based wireless data transmission, so the emphasis is on Bluetooth radio frequency processing.
If the smart bracelet is just used for data transmission without the need for transmission of voice and music, so low power Bluetooth is the best choice in the design of Bluetooth antenna, antenna shape, layout, smart Bracelet shell materials are the important factors influencing the performance of smart bracelet. In the smart Bracelet PCB design process, a good RF antenna engineers are particularly important.
Do a good job of ESD protection design
Different countries and regions have different standards for different products or products of the same ESD requirements, in order to make the products through the relevant test in the design of ESD protection design, but also for the detection of ESD after the design is completed, to ensure the products meet the electronic detection of the local market.
Reserved system upgrade interface
An intelligent Bracelet functional upgrade is convenient for users or smart Bracelet fans have an important significance. If a product of software at the appropriate time to upgrade (probably early hardware design to some function in order to catch up with the market software did not catch up with, may also be some repair software, BUG) indicating that the product development process is still kept in it for the user to say is a good mental compensation. Now, there are two ways to upgrade a smart Bracelet: the USB interface and the wireless push. As for which method to adopt, it is necessary to make a plan in the prophase plan and the hardware and software plan.
