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PCB Tech
How to burn the chip in PCBA processing
PCB Tech
How to burn the chip in PCBA processing

How to burn the chip in PCBA processing


Chip programming is the process of burning or transferring the program written by the computer to the chip IC. At present, common chip programming includes PROM and EPROM. PCBA processing technology is becoming more and more mature, and the application range is becoming more and more extensive. There is no shadow of PCBA in life. PCBA will also exist in mobile phones, watches, cars and trains, and even a pen used. PCBA has been applied to all walks of life. In order for PCBA to better realize the expected design functions, in addition to the normal hardware, there is no lack of software cooperation. In particular, there are more and more intelligent products at present, and more and more requirements for program customization. In this way, for PCBA processing, not only hardware processing, but also chip programming is required.

Chip burning is to write the program into the internal storage space of the chip through a burning tool, which is generally divided into offline burning and online burning. Next, PCBA R&D and manufacturing manufacturers will introduce common burning methods for everyone.

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Chip offline programming

Compatible with different packaged chips through various adapters, and only when the chip and the adapter are used together can the program be burned. The adapter itself is a precision fixture, and different chips and different packages require different adapters. At present, the packaging of chips such as Emmc, which is widely used, is developing in the direction of miniaturization and planarization such as BGA and QFN, and the price of adapters of this type of packaging is not low.

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-programmed in accordance with the prescribed process, which is time-consuming, laborious, and costly. There will be some unexpected situations during PCB processing and production, such as insufficient temperature resistance of the circuit board, and the chip will be deformed when the chip is disassembled, which will invisibly increase the risk of scrap.

Chip PCBA online programming

The chip's online programming uses the chip's standard communication bus, such as USb, SWD, JTAG, uart, etc. The interface is generally fixed, and there are fewer pins that need to be connected during programming. Because the interface communication rate is not high, it can be completed by using ordinary wires, and the chip programming will not produce high consumption.

Since online programming is performed by wire connection, if an error is found during the production test, the PCBA can be re-programmed immediately without removing the chip. It not only saves production costs, but also increases the efficiency of programming.

More importantly, the production line is also developing towards automation. More and more manufacturers add ICT, FCT and other functional testing machines to the production line. The production method of using automatic fixtures and online programming can be omitted in the programming stage. Manual operation, burn directly after mounting the board, and then send the PCBA to the testing machine for testing. The entire production process is fully automated, which can greatly improve production efficiency.

Therefore, in PCBA processing, the advantages of online programming are significant, and it has become one of the important indicators in the industry to measure the process accuracy, production efficiency, cost, quality control, scale, capital and other aspects of PCBA manufacturers.