A reset device and method suitable for modular equipment
A device and reset circuit technology, which is applied in the field of reset devices of module-type devices, can solve the problems of narrow reset threshold selection interval, insufficient equipment robustness, and poor reliability, and achieves easy miniaturization packaging, high integration, Reliable effect
Active Publication Date: 2020-07-21
DATA COMM SCI & TECH RES INST +1
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Problems solved by technology
In actual usage scenarios, each host computer generally provides a power supply voltage between 2.7-3.3V. At this time, the reset threshold should be at least lower than 2.7V and higher than 2.6V (3.3-0.7). The selection range of the reset threshold is narrow, and the device Insufficient robustness and poor reliability
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[0031] Preferred embodiments of the present invention will be specifically described below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the application and are used together with the embodiments of the present invention to explain the principle of the present invention.
[0032] figure 1 This is the core problem to be solved by this solution. All communication interface pins of the CPU have anti-static and overvoltage protection circuits. The front stage of this circuit is generally two diodes. The power network is derived, and the voltage that the subsequent stage bears is only Vinterface–Vforward, where Vinterface is the interface voltage, and Vforward is the forward conduction voltage of the diode; when the interface voltage is too low, the low voltage is derived from the ground network through the diode, and the subsequent stage The withstand voltage is only -Vforward.
[0033] Module devices are miniaturized device...
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The invention relates to a resetting apparatus suitable for a module type device. The resetting apparatus comprises an interface voltage preprocessing circuit, a voltage comparison circuit and a resetting circuit, wherein the input end of the interface voltage preprocessing circuit is connected with an interface voltage and is connected to the ground through serial connection of resistors R1 and R2, a connection point of the resistors R1 and R2 serves as an output of the interface voltage preprocessing circuit, and the processed interface voltage is output; two input ends of the voltage comparison circuit are connected with a power supply voltage and the processed interface voltage; and an input of the reset circuit is an output of the voltage comparison circuit. According to the resetting apparatus suitable for the module type device, provided by the invention, a large amount of peripheral devices are not added on the premise of realizing a general resetting circuit function, and the integration degree is high, so that miniaturization packaging is better facilitated; meanwhile, the device is ensured to be in a reset state under the condition that power supply is turned off but the interface voltage exists; and a complex analog circuit is not contained, so that the reliability is high.
Description
technical field [0001] The invention relates to the technical field of circuit reset, in particular to a reset device and method suitable for modular equipment. Background technique [0002] The power supply of the module device depends on the host computer. When the host computer turns off the power supply of the device, if the communication interface voltage between the host computer and the module device still exists, the module device may be in unstable work driven by the reverse current of the interface protection circuit. state. This phenomenon does not have much impact on storage devices, but it may cause problems such as power-on reset failure and internal program logic confusion when the smart module device with CPU is powered on next time. [0003] In order to avoid the above problems, a reset circuit with threshold detection is usually used to monitor the power supply voltage in real time. When the power supply voltage is lower than the normal threshold, the rese...
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IPC IPC(8): G06F1/24
CPCG06F1/24
Inventor 王勤龙
Owner DATA COMM SCI & TECH RES INST