Circuit system for realizing Efuse burning

Abstract

The invention relates to a circuit system for realizing Efuse burning, which comprises a burning key module, the burning key module comprises a voltage conversion chip, a spring connector, a first resistor and a second resistor, the first resistor and the second resistor are connected in series to form a voltage division circuit, the first resistor is connected with the reference feedback voltage end of the voltage conversion chip, and the second resistor is connected with the reference feedback voltage end of the voltage conversion chip. The first resistor is further connected with the output voltage Vout end of the voltage conversion chip, the second resistor is grounded, and the input voltage Vin end and the output voltage Vout end of the voltage conversion chip are connected with the DUT chip to be burnt through spring connectors respectively. By adopting the circuit system for realizing Efuse burning, different voltage outputs are realized only by adjusting the divider resistor, diversified voltage requirements of burning KEY are accurately met, the circuit system is integrally designed into a jig plate and can be efficiently matched with a complete machine DUT jig of a production line, the hardware requirement of a DUT prototype for burning the KEY is met, the tool environment difference of mass production of different projects is optimized, and the production efficiency is improved. The yield of production is improved, and the risk of secondary burning of the KEY by the DUT is guaranteed synchronously.

Description

Technical Field

[0001] This invention relates to the field of hardware-level security protection, and more particularly to the field of electronic fuses, specifically to a circuit system for implementing Efuse programming. Background Technology

[0002] Efuse is a core component of hardware-level security protection, preventing chip cloning, key leakage, and firmware tampering. It is widely used in scenarios with high security requirements. The core objective of this invention patent is to solve the "defective unit" problem in chip manufacturing. For the mass production needs of factories using Efuse to program keys (KEYs), an Efuse programming fixture module has been developed. This module outputs multiple Efuse breaking voltages, enabling factories to quickly and easily program keys for different DUTs, improving production efficiency and ensuring the functional integrity of the chips leaving the factory. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a circuit system for Efuse programming that is characterized by good integrity, high production efficiency, and wide applicability.

[0004] To achieve the above objectives, the circuit system for Efuse programming in this invention is as follows: The main feature of this circuit system for Efuse programming is that the system includes a programming key module, which includes a voltage conversion chip, a spring connector, a first resistor, and a second resistor. The first and second resistors are connected in series to form a voltage divider circuit. The first resistor is connected to the reference feedback voltage terminal of the voltage conversion chip and also to the output voltage Vout terminal of the voltage conversion chip. The second resistor is grounded. The input voltage Vin terminal and the output voltage Vout terminal of the voltage conversion chip are respectively connected to the DUT chip to be programmed through the spring connector.

[0005] Preferably, the voltage conversion chip acquires the voltage across the first resistor R1, compares the voltage across the first resistor R1 with the reference feedback voltage of the voltage conversion chip in real time, adjusts the resistance ratio of the first resistor R1 and the second resistor R2 according to the comparison result, and outputs the target voltage required for the DUT chip to be programmed with the KEY.

[0006] Preferably, the key programming module further includes an LED, one end of which is connected to the input voltage Vin terminal of the voltage conversion chip, and the other end of which is grounded.

[0007] Preferably, the input voltage Vin terminal of the voltage conversion chip is connected to the power supply point of the DUT chip being programmed via a spring connector, and the output voltage Vout terminal of the voltage conversion chip is connected to the programming KEY signal point of the DUT chip being programmed via a spring connector.

[0008] Preferably, the spring connector is a spring-loaded pin, which connects the programming key module and the programming DUT chip.

[0009] This circuit system, which implements Efuse programming, achieves different voltage outputs simply by adjusting the voltage divider resistors, precisely meeting the diverse voltage requirements for key programming. The module is integrated into a fixture board, enabling efficient cooperation with the complete DUT fixture on the production line. This not only meets the hardware requirements of the DUT prototype for key programming but also optimizes the differences in tooling environments during mass production of different projects, improving production yield and simultaneously mitigating the risk of secondary key programming on the DUT. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the circuit system for implementing Efuse programming according to the present invention. Detailed Implementation

[0011] To more clearly describe the technical content of the present invention, the following description is provided in conjunction with specific embodiments.

[0012] The circuit system for implementing Efuse programming of the present invention includes a programming key module, which includes a voltage conversion chip, a spring connector, a first resistor, and a second resistor. The first resistor and the second resistor are connected in series to form a voltage divider circuit. The first resistor is connected to the reference feedback voltage terminal of the voltage conversion chip and is also connected to the output voltage Vout terminal of the voltage conversion chip. The second resistor is grounded. The input voltage Vin terminal and the output voltage Vout terminal of the voltage conversion chip are respectively connected to the DUT chip to be programmed through the spring connector.

[0013] In a preferred embodiment of the present invention, the voltage conversion chip acquires the voltage across the first resistor R1, compares the voltage across the first resistor R1 with the reference feedback voltage of the voltage conversion chip in real time, adjusts the resistance ratio of the first resistor R1 and the second resistor R2 according to the comparison result, and outputs the target voltage required for the DUT chip to be programmed with the KEY.

[0014] In a preferred embodiment of the present invention, the key programming module further includes an LED light, one end of which is connected to the input voltage Vin terminal of the voltage conversion chip, and the other end of which is grounded.

[0015] In a preferred embodiment of the present invention, the input voltage Vin terminal of the voltage conversion chip is connected to the power supply point of the DUT chip being programmed via a spring connector, and the output voltage Vout terminal of the voltage conversion chip is connected to the programming KEY signal point of the DUT chip being programmed via a spring connector.

[0016] In a preferred embodiment of the present invention, the spring connector is a spring-loaded pin, which connects the programming key module and the programming DUT chip.

[0017] This invention utilizes the MP1653H DC-DC power chip with different voltage divider resistors to output the voltage required for fuse breaking when programming the DUT key. Then, the fixture board is connected to the DUT using flexible connecting posts, which allows the key programming operation to be performed. After the key is written, it is disconnected, thus completing the key programming fuse action and avoiding the DUT being programmed multiple times.

[0018] The working principle of the key programming module is to use the voltage conversion chip of the DUT prototype itself to select a dedicated power supply from a conventional power supply as the Vin power supply for programming the key module. A voltage conversion chip is designed in the programming module, with a first resistor R1 and a second resistor R2 connected in series for voltage division. The voltage across the first resistor R1 is compared with the feedback voltage of the voltage conversion chip (feedback refers to...). Figure 1 (The FB terminal on the DUT chip) Then adjust the resistance values ​​of the first resistor R1 and the second resistor R2 to obtain the voltage required for the DUT chip to be programmed with the key. This ensures that the DUT has the required input voltage during the key writing process, and the circuit can be removed immediately after programming is completed, ensuring production protection for the programming and writing operation.

[0019] The programming key module and the DUT are connected via flexible pins. The flexibility allows for better contact between the programming module and the DUT, preventing damage to the DUT prototype. Simultaneously, LEDs are added to monitor the contact of pins such as Vin in real time.

[0020] In a specific embodiment of this invention, power acquisition utilizes the voltage conversion chip within the DUT prototype itself. One of the conventionally converted dedicated power supplies is selected as the module's input voltage (Vin), eliminating the need for an additional external power supply unit. The module internally incorporates a dedicated voltage conversion chip, with a core adjustment unit comprised of a first resistor R1 and a second resistor R2 connected in series as a voltage divider. Its operating logic involves real-time comparison of the voltage across the first resistor R1 with the reference feedback voltage of the voltage conversion chip. Based on the comparison result, the resistance ratio of the first resistor R1 and the second resistor R2 is adjusted to accurately output the target voltage required for key programming on the DUT chip, ensuring that the input voltage fully meets the chip specifications during the key writing process.

[0021] The present invention also features a safety protection design. After the programming is completed, the adjustment circuit can immediately disconnect from the working state, cutting off the voltage adjustment link at the hardware level to avoid potential interference to the normal operation of the DUT and achieve physical isolation protection during the programming process.

[0022] This invention also features optimized connection and monitoring. It employs a flexible pin structure to achieve physical connection between the module and the DUT. The elastic buffer ensures tight contact while avoiding damage to the DUT prototype caused by rigid contact. It integrates a light-emitting diode (LED) monitoring circuit, which can indicate the contact status of key pins such as Vin in real time, intuitively judge the connection reliability, and reduce programming failures caused by poor contact.

[0023] In a specific embodiment of the present invention, the following experimental data were obtained after testing: KEY was repeatedly burned for 24 hours, with an input Vin voltage of 3V3 and an output Vout voltage of 2V0. The test result was PASS, indicating good stability.

[0024] ; For the specific implementation scheme of this embodiment, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0025] It is understood that the same or similar parts in the above embodiments can be referred to each other, and the contents not described in detail in some embodiments can be referred to the same or similar contents in other embodiments.

[0026] It should be noted that in the description of this invention, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, in the description of this invention, unless otherwise stated, "a plurality of" means at least two.

[0027] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0028] This circuit system, which implements Efuse programming, achieves different voltage outputs simply by adjusting the voltage divider resistors, precisely meeting the diverse voltage requirements for key programming. The module is integrated into a fixture board, enabling efficient cooperation with the complete DUT fixture on the production line. This not only meets the hardware requirements of the DUT prototype for key programming but also optimizes the differences in tooling environments during mass production of different projects, improving production yield and simultaneously mitigating the risk of secondary key programming on the DUT.

[0029] In this specification, the invention has been described with reference to specific embodiments thereof. However, it will be apparent that various modifications and variations can be made without departing from the spirit and scope of the invention. Therefore, the specification and drawings should be considered illustrative rather than restrictive.

Claims

1. A circuit system for implementing Efuse programming, characterized in that, The system includes a key programming module, which comprises a voltage conversion chip, a spring connector, a first resistor, and a second resistor. The first and second resistors are connected in series to form a voltage divider circuit. The first resistor is connected to the reference feedback voltage terminal of the voltage conversion chip and also to the output voltage Vout terminal of the voltage conversion chip. The second resistor is grounded. The input voltage Vin terminal and the output voltage Vout terminal of the voltage conversion chip are respectively connected to the DUT chip to be programmed via spring connectors.

2. The circuit system for implementing Efuse programming according to claim 1, characterized in that, The voltage conversion chip acquires the voltage across the first resistor R1, compares the voltage across the first resistor R1 with the reference feedback voltage of the voltage conversion chip in real time, adjusts the resistance ratio of the first resistor R1 and the second resistor R2 according to the comparison result, and outputs the target voltage required for the DUT chip to be programmed with the KEY.

3. The circuit system for implementing Efuse programming according to claim 1, characterized in that, The key programming module also includes an LED, one end of which is connected to the input voltage Vin terminal of the voltage conversion chip, and the other end of which is grounded.

4. The circuit system for implementing Efuse programming according to claim 1, characterized in that, The input voltage Vin terminal of the voltage conversion chip is connected to the power supply point of the DUT chip being programmed via a spring connector, and the output voltage Vout terminal of the voltage conversion chip is connected to the programming KEY signal point of the DUT chip being programmed via a spring connector.

5. The circuit system for implementing Efuse programming according to claim 1, characterized in that, The spring connector is a spring-loaded pin that connects the programming key module to the DUT chip being programmed.

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