PCB Board design considerations for smart wristbands

- Mar 16, 2017-

Smart bracelet, as a more popular form in nearly two years, people are paying more and more attention, although not all people, but it does make electronic products market has had some changes.
A smart hand rings are usually made of RF Circuit unit, clock circuit, memory circuit, sensor unit and a main control unit MCU, etc, and circuit PCB is usually concentrated on a smaller scale, single-sided or double-sided SMT, PCB layer 4 or 6 layers. Photo was found on the network of 37 degrees under intelligent circuit PCB bracelet.
Multifunctional concentrated on a small PCB Board, then the bracelet layout and wiring in we should pay extra attention now summarize some note, for reference.
First, partition layouts, attention to the cable protection.
As can be seen from the above the PCB circuit board, intelligent sections of the loop circuit (different colors marked the box) has a good partition: the smart bracelet is a digital circuit elements together, as long as in circuit design supporting the resistance and capacitance distribution, you can complete certain functions of circuit modules, which makes design more compact and easier to find. Although some of the sensor unit using the analog circuit technology for data collection, once the module is a module, then, can be completed through the connection interface of data communication and transmission of information.
In the circuit layout, need to pay attention to the clock circuit and oscillator circuit through the shortest path to reach the destination discipline, on the other hand, also note that when the clock line to avoid cable prevents interference affecting the stability of the system.
Walk in line, key line needs to be protected, such as clock generator, Crystal deposited copper protection circuit is whether ring protection, protected in the design, Crystal parts need to dig a copper treatment.
Secondly, dealing with RF circuits.
Smart bracelet requires linkage and cell phones while in use, so the RF part is a key part in the design of this part, be sure to pay special attention to. Smart bracelet now on the market are inextricably based on Bluetooth for wireless data transmission, so the point of Bluetooth radio. If the smart bracelet is used for data transfer without the need for sound and music delivery, low-power Bluetooth is the best choice, at design time, Bluetooth antenna, the antenna layout, smart bracelet shell material is intelligent band performance is an important factor. Smart bracelet in PCB design, an excellent RF antenna engineers is very important.
Once again, good ESD protection.
In the previous article I wrote some circuit ESD technologies and knowledge, today said the importance of smart bracelet ESD products. Different countries and regions of different products or similar products have different standards for ESD requirements, in order to make the products pass testing, ESD protection design at design time, after the design is completed with ESD testing, through electronic detection products adapted to local markets.
Finally, the reservation system upgrade interface.
A smart bracelet for feature upgrades is available for users or smart bracelet enthusiast who has important significance. If a product at the right time for a software upgrade (probably early to certain features in order to catch up with the hardware design software market has not kept up, or it may be some software BUG is fixed), indicating that products are constantly in the process of research and development, which is a good psychological compensation for the user. Now smart bracelet software upgrade there are usually two ways: through the USB interface and wireless push method. Which method you use, identification of needs in planning and planning of hardware and software is.

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