The chip has been polished. How to detect the model? Formal third-party testing organization

Date：2022-01-18 14:55:00Views：2158

At present, many electronic product manufacturers specially polish the printing on the surface of one or more IC models in their products in order not to let others know the IC chip models used in their products. The model of computer chips can also be determined through the detection of drivers and third-party software, but computer chips are rarely polished in the main board factory. So how to detect the model after the chip is polished? In order to provide you with more knowledge about IC models, let me introduce you to the following related contents.

In the process of chip decryption / single chip microcomputer decryption, the customer's chip is often encrypted, and the model is polished, because the model cannot be determined. Then it is necessary to identify the model. Of course, not all chips can identify the model, such as:

1. If it is some special customized chips, it is impossible to judge the model after polishing, in order to prevent someone from copying the board.

2. Generally, the package is corroded by nitric acid, and then the layout is viewed by microscope, electric scanning, etc. Most regular large factories should be able to see.

3. Some users can judge the general function according to the circuit, and then estimate the possible models according to the pin and connection method, and compare them. You can also know the specific model of the chip. The commonly used integrated circuits are easy to handle, and there is no way for those that are not commonly used.

In this way, we cannot find the chip model according to the chip surface information. In this case, we can only take photos of the chip and analyze its internal information to get the IC model. Next is the chip processing process:

1. Chip cover openingOpen the cover by chemical method or special packaging type, process the gold wire and take out the grains.

2. Hierarchical removalThe layer is removed by etching, including removing the protective layer polyimide, oxide layer, passivation layer, metal layer, etc.

3. Chip dyeingIt is easy to identify by dyeing, mainly including metal layer brightening, different types of well area dyeing and ROM code point dyeing.

4. Chip photographyThe chip was photographed by electron microscope (SEM).

5. Image mosaicSplice the captured area images (software splicing, manual splicing after photo development).

6. Circuit analysisIt can extract the digital and analog circuits in the chip, sort them into easy to understand hierarchical circuit diagrams, and release them to customers in the form of written reports and electronic data.

The chip decryption operation requires high-power microscope and fib

In the chip decryption industry, the most correct decryption method is to adopt the hardware decryption method, that is, dissolve the chip with specific dissolved fat to expose the chip. In this step, it also needs some skills. Of course, in this step, sometimes the chip may be dissolved, that is, the line may be dissolved and broken, So the chip won't work at all.

When the chip is exposed, we need to use a high-power microscope and FIB (focused ion beam equipment), use these two devices to find the encryption position of the chip, change the encryption chip to an unencrypted state by changing its circuit, and then use a programmer to read the program inside the chip.

The above is the related content of polished chip model test compiled by Chuangxin testing small editor. I hope it will be helpful to you. Chuangxin testing is a professional testing organization for electronic components. At present, it mainly provides integrated circuit testing services such as capacitance, resistance, connector, MCU, CPLD, FPGA and DSP. Specializing in functional testing of electronic components, incoming appearance testing of electronic components, anatomical testing of electronic components, acetone testing, X-ray scanning testing of electronic components and RoHS component analysis testing. Welcome to call, we will serve you wholeheartedly!