Efuse is a programmable electronic fuse for nonvolatile storage at the chip level. It can be programmed to a high resistance state or a low resistance state, and once programmed, it will remain in its state even if the power is cut off or restarted. The main function of Efuse is to store and protect the configuration information of the chip, such as serial number, encryption key, calibration data and other important hardware parameters.
In traditional chip design, the configuration information is usually stored in EEPROM (Electrically Erasable Programmable Read Only Memory) or flash memory. However, using Efuse to store this information has some advantages. First, Efuse is usually smaller and more compact than EEPROM or flash memory, so it can be more easily integrated into STM8S103F3P6 In the chip. Secondly, Efuse has faster reading speed and lower power consumption. Most importantly, Efuse is programmed once. Once it is burned, it cannot be erased or modified, thus providing higher security and protection.
The implementation of Efuse is usually based on programmable metal connections or polysilicon resistors. It contains a current sensor and an encoder to convert the resistance value into a digital code. When Efuse is programmed, the resistance value changes, thus changing the output of the current sensor. The encoder converts the output current into digital code and stores it in the chip. When reading Efuse, the encoder converts the digital code back to the current, and reads the state of Efuse by measuring the current.
Efuse has many applications at the chip level. The following are some common application scenarios:
1. Chip identity authentication: Efuse can store the unique serial number of the chip for identity authentication and anti-counterfeiting. This can help manufacturers prevent piracy and counterfeiting.
2. Encryption and security: Efuse can store encryption keys and other security parameters to protect the chip from unauthorized access and attacks. These keys and parameters can be used for chip level encryption and decryption operations.
3. Calibration and compensation: Efuse can store calibration data and compensation parameters for calibration and correction of uncertainty and deviation in the chip. For example, it is used to calibrate analog circuits, temperature sensors, clocks, etc.
4. Configuration of electronic products: Efuse can store configuration information of electronic products, such as resolution of display screen, calibration data of touch screen, audio configuration of audio chip, etc. These configuration information can be programmed in the manufacturing process to adapt to different product models and specifications.
5. Fault protection and self-healing: Efuse can be used to detect and protect circuit faults in the chip. Once the fault is detected, Efuse can automatically disconnect the fault circuit and mark it as unavailable. This helps improve the reliability and availability of the chip.
In a word, Efuse is an important chip level component used to store and protect chip configuration information and other important parameters. It has advantages in security, reliability and power consumption, and is an indispensable part of modern chip design.
