Memory chip writing protective circuit and memory chip writing protective method applied to security product

A memory chip and write protection technology, applied in information storage, static memory, digital memory information, etc., can solve problems such as damage, loss of device firmware programs, etc., and achieve the effects of prolonging service life, fast and stable switching, and high integration

Inactive Publication Date: 2015-02-04
TIANJIN TIANDY DIGITAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention is to solve the problem that the device firmware program is lost or damaged during the long-term use of the memory, and proposes a memory chip write protection circuit and its method applied to security products

Method used

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  • Memory chip writing protective circuit and memory chip writing protective method applied to security product
  • Memory chip writing protective circuit and memory chip writing protective method applied to security product

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Embodiment Construction

[0016] Below, the present invention is described in detail with reference to accompanying drawing and embodiment:

[0017] Such as figure 1 As shown, the memory chip write protection circuit applied to security products of the present invention includes a voltage divider circuit composed of capacitors and resistors. An inverter is formed, and the output end of the inverter is connected to the memory chip.

[0018] Such as figure 2 As shown, the memory chip write protection method applied to security products of the present invention is specifically:

[0019] Ⅰ First set the resistance value of the voltage divider circuit resistor to determine the actual voltage of the integrated reset chip;

[0020] Ⅱ When the input voltage is higher than the working voltage, the actual voltage of the integrated reset chip is higher than the standard voltage, the output terminal of the integrated reset chip outputs a high level, and then passes through two inverters in turn to enhance the ...

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Abstract

The invention discloses a memory chip writing protective circuit applied for a security product. The circuit comprises a voltage division circuit consisting of a capacitor and a resistor, wherein the voltage division circuit is connected with an integrated reset chip, the output end of the integrated reset chip is sequentially connected with two inverters mainly consisting of triodes, and the output ends of the inverters are connected with a storage chip. The circuit disclosed by the invention is suitable for various electronic products requiring storage and is used for solving the technical problem that in the long-time using process of an electronic product, a firmware program of equipment is lost or is damaged, so that the service life of the equipment is greatly prolonged, the fault probability of the equipment is reduced and the investment on equipment repair and maintenance is lowered. The circuit is simple, is lightly influenced by external environment change and quick and stable to switch and has the advantages of being high in reliability, high in integration level, high in intelligentization, low in cost and the like, thereby facilitating popularization in the fields of traffic, security and protection, civil use and the like in China.

Description

technical field [0001] The invention belongs to the field of protection circuits, and in particular relates to a storage chip write protection circuit applied to security products and a method thereof. Background technique [0002] As the country pays more and more attention to public safety, the security industry continues to develop and technology is constantly updated, and the cost of high-definition camera products is getting lower and lower, which in turn promotes the popularization of high-definition surveillance. The role played by domains is also more prominent. According to statistics, the annual shipments of high-definition cameras of several major domestic security manufacturers have exceeded 10 million units. [0003] During the long-term use of the existing high-definition cameras, due to the loss or damage of the device firmware program, the device fails to connect to the network and can only be returned to the original factory for maintenance. This is a probl...

Claims

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Application Information

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IPC IPC(8): G11C7/24
Inventor 戴林刘子龙
Owner TIANJIN TIANDY DIGITAL TECH
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