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What is the "burning" procedure in PCBA?
In the PCBA processing process, in order to enable the PCB board to achieve certain specific functions, in addition to the hardware is no problem, it is also necessary to add software functions. At this time, we need to "burn" the program. Before programming, we need to test whether the PCB board is qualified, and then select the appropriate programming method.
The current burning methods are generally divided into offline burning and online burning.
Offline programming: through the adapter and different packaged chips link, the chip and the adapter can be used together to achieve the programming of the program. The nature of the adapter is similar to a precision fixture, and different packaged chips need to be matched with different adapter seats. If there is an error during the production test, and the production retrospective re-correction is performed, the chip needs to be removed from the adapter and re-burned in accordance with the prescribed process, which consumes a lot of manpower and material resources, high cost, and is more prone to problems. Therefore, offline burning is generally not recommended.
On-line burning: On-line burning uses the chip’s standard communication bus, such as USB, SWD, JTAG, UART, etc. The interface is generally fixed, and it needs to be connected for program burning when burning, if it is tested in production If you find an error, you can re-program without disassembling the chip. It not only saves production cost, but also increases the number of pins to be connected for programming. Because the interface communication rate is not high, the programming can be completed by using ordinary wires without high consumption. Online burning is the efficiency of connecting wires. Therefore, online burning is generally used now.
SMT whole-process quality control is a systematic project. To obtain stable product quality, in addition to systematic consideration, system design and system control of design, process, materials and production, it is also necessary to master SMT process essentials, engineering knowledge and control Point. Introduced the management and control characteristics of each process of SMT, combined with the NADCAP AC7120 audit requirements, put forward the quality control requirements that need to be paid attention to in addition to the basic process requirements of the SMT production line.
SMT whole-process quality control is a systematic project. To obtain stable product quality, systematic thinking, system design, and system control must be carried out on design, materials, and on-site processes. The purpose of management and control is to fully achieve process requirements and maintain process quality stability. In addition to mastering SMT (Surface Mount Technology, surface mount technology) process essentials (process methods and requirements, key points of process technology), engineering knowledge, and common welding defects In addition to the generation mechanism and disposal countermeasures, it is also necessary to establish an effective quality control system to quickly solve the production process problems.
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