A brief introduction to the practical method of improving the stability of chip on-line burning

Date：2022-07-08 16:57:15Views：638

In order to improve the burning efficiency, some jigs and burning tooling are usually made. Fixtures, tooling and programmers need long wiring, and the length of the wire will affect the strength of signal transmission. Generally speaking, the longer the line, the weaker the signal. When the signal is weak, the bad burning rate will increase. Generally, long (more than 10cm) wiring is required between the tooling or fixture and the burner, but many burning interfaces use high-frequency signal protocol (high-frequency signal between 3 ~ 30MHz). It is vulnerable to the influence and interference of many external factors, resulting in the increase of bad burning rate and insufficient stability. This article will introduce several practical methods to improve this problem.

1、 Reduce communication frequency

Communication frequency is an important parameter of information transmission. The higher the frequency, the faster the transmission speed, but the attenuation of the signal will increase with the increase of frequency. Therefore, if the burning speed is not high, the communication frequency can be appropriately reduced to increase the stability of burning.

2、 Try to shorten the length of signal line

High frequency signal transmission is greatly affected by transmission distance. The farther the distance is, the greater the attenuation will be, resulting in burning instability. We can arrange the burning interface of the recorder at the position closest to the fixture signal input port to shorten the length of the whole signal line as far as possible.

3、 Select signal lines with strong conductivity

The integrity of signal transmission is related to the material, length and thickness of the line. You can choose a thicker line with stronger conductivity. A good material can reduce internal resistance and signal loss, such as pure copper wire, gold-plated wire, silver plated wire, etc.

4、 Add a shielding layer to the burning signal line to prevent electromagnetic interference

When the burner burns the chip through the burning signal line, the burning high-frequency signal is more sensitive to electromagnetic interference. The burning environment is generally factory workshops, high-power equipment, which makes the electromagnetic interference more serious. In order to reduce the electromagnetic interference, we can add a shielding network to the burning signal line, or choose the line with shielding function, such as shielded cable, network cable, etc.

5、 Connect pull-up and pull-down resistors on key signal lines

Sometimes, the insufficient driving capacity of the burning interface of the recorder will also lead to unstable burning. At this time, it is necessary to add appropriate pull-up or pull-down resistors on the interface signal line to enhance the driving capacity.

6、 Replace the burner with higher stability

Weak anti-interference ability of the internal circuit of the burner or insufficient driving ability of the interface circuit of the burner will lead to unstable burning. In this case, it is best to choose another burner with higher stability.

The above is related to the online burning of chips compiled by the core detection team. I hope it will be helpful to you. Shenzhen Chuangxin Online Testing Technology Co., Ltd. is a well-known professional testing institution for electronic components in China, with 3 standardized laboratories covering an area of more than 1000 square meters. The scope of testing services covers: electronic component testing and verification, IC authenticity identification, product design and material selection, failure analysis, function testing, factory incoming material inspection, component X-ray testing, taping and other test items.