CN109787188A - Configurable supply voltage monitoring and protecting circuit - Google Patents
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Abstract
本发明提供了一种可配置电源电压监测保护电路。所述可配置电源电压监测保护电路包括带隙基准，可配置分压电路、滞回比较电路以及电平锁存器，本发明电源电压监测电路可以实时监测芯片的电源电压，一旦电压出现掉电、欠压现象，就会发出指示信号，片内电路可以利用此信号完成重要数据的保存，待系统重新上电或者电压恢复正常时重新读取数据，继续工作。
The invention provides a configurable power supply voltage monitoring protection circuit. The configurable power supply voltage monitoring and protection circuit includes a bandgap reference, a configurable voltage divider circuit, a hysteresis comparison circuit and a level latch. The power supply voltage monitoring circuit of the present invention can monitor the power supply voltage of the chip in real time. , under-voltage phenomenon, an indication signal will be issued, the on-chip circuit can use this signal to complete the storage of important data, and read the data again when the system is powered on again or the voltage returns to normal, and continue to work.
Description
技术领域technical field
本发明涉及一种半导体集成电路，特别是用于对数据保存有极高的要求，尤其要求在电源电压不正常时，例如意外掉电时，数据不能被破坏的数据采集、过程记录以及传感测量的集成电路。The invention relates to a semiconductor integrated circuit, which is especially used for data acquisition, process recording and sensing that cannot be destroyed when the power supply voltage is abnormal, such as accidental power failure, which has extremely high requirements for data preservation. Measuring integrated circuits.
背景技术Background technique
在用于数据采集、过程记录以及传感测量的集成电路中，一般都会有内部的数据存储单元，这些数据的物理安全性直接决定了系统的稳定性，极为重要。芯片电源电压的波动，尤其是意外掉电过程，是破坏数据的最重要因素之一，为了保证数据安全，有两种方式解决这一问题，一是在片外增加设备保证电源的稳定性，例如持续供电系统或者大的片外应急电源，但这种设备本身也存在一定的意外风险，二是通过片内增加必要功能模块，保证电压离开正常范围后，芯片系统得到这一信息并及时暂存数据，避免数据丢失，方式二是数据安全的最后一道屏障，也是必需的安全措施。因此，对片内电源电压必不可少。片内的监测电路需要完成掉电监测和欠压监测，不但能精确检测并及时发出电压异常的检测信号，还要允许电源电压的正常波动，同时保证极低的芯片面积成本和功耗成本。In integrated circuits used for data acquisition, process recording and sensor measurement, there are generally internal data storage units. The physical security of these data directly determines the stability of the system and is extremely important. The fluctuation of the chip power supply voltage, especially the accidental power failure process, is one of the most important factors to destroy data. In order to ensure data security, there are two ways to solve this problem. One is to add equipment off-chip to ensure the stability of the power supply. For example, a continuous power supply system or a large off-chip emergency power supply, but this kind of equipment itself also has certain accident risks. The second is to add necessary functional modules on-chip to ensure that after the voltage leaves the normal range, the chip system obtains this information and temporarily To save data and avoid data loss, the second method is the last barrier to data security, and it is also a necessary security measure. Therefore, the on-chip power supply voltage is essential. The on-chip monitoring circuit needs to complete power-down monitoring and under-voltage monitoring, which can not only accurately detect and timely issue abnormal voltage detection signals, but also allow normal fluctuations of the power supply voltage, while ensuring extremely low chip area costs and power consumption costs.
发明内容SUMMARY OF THE INVENTION
本发明提供一种用于芯片内可配置电源电压的监测保护电路，由四部分组成：带隙基准、可配置分压电路、滞回比较器及电平锁存器。The invention provides a monitoring and protection circuit for a configurable power supply voltage in a chip, which consists of four parts: a bandgap reference, a configurable voltage divider circuit, a hysteresis comparator and a level latch.
其中，in,
所述带隙基准，其一端所述滞回比较电路相连，能引出基准电压，供所述滞回比较电路使用；One end of the bandgap reference is connected to the hysteresis comparison circuit, and a reference voltage can be drawn out for the hysteresis comparison circuit to use;
所述可配置分压电路，其一端与所述滞回比较电路相连，对电源电压进行采样，得到采样电压；The configurable voltage divider circuit, one end of which is connected to the hysteresis comparison circuit, samples the power supply voltage to obtain the sampled voltage;
所述滞回比较电路，其一端与所述带隙基准相连，另一端与所述可配置分压电路相连，对基准电压与采样电压进行比较，得到监测信号；The hysteresis comparison circuit has one end connected to the bandgap reference and the other end connected to the configurable voltage divider circuit, and compares the reference voltage with the sampled voltage to obtain a monitoring signal;
所述电平锁存器，其一端与所述可配置分压电路相连，另一端与所述滞回比较电路相连。One end of the level latch is connected to the configurable voltage divider circuit, and the other end is connected to the hysteresis comparison circuit.
可选地，所述可配置分压电路，可以调整采样电压与电源电压的比例。Optionally, the configurable voltage divider circuit can adjust the ratio of the sampling voltage to the power supply voltage.
可选地，当不需要监测电源电压时，所述电平锁存器可以保证控制信号的稳定，使电路保持正常工作状态。Optionally, when the power supply voltage does not need to be monitored, the level latch can ensure the stability of the control signal and keep the circuit in a normal working state.
可选地，所述可配置电源电压监测电路可以接收控制信号与使能信号，在不需要监测电源电压时，通过使能端可以关闭检测电路。Optionally, the configurable power supply voltage monitoring circuit can receive a control signal and an enable signal, and when the power supply voltage does not need to be monitored, the detection circuit can be turned off through the enable terminal.
本发明实施例提供的可配置电源电压监测保护电路，解决监测电源掉电和欠压的异常状态，并发出检测信号，通知工作电路以保护数据安全，避免数据错误和数据丢失的情况。同时，电路本身具有简单的结构，占据较小的芯片面积，消耗功耗极低，不影响芯片的正常工作状态，能容忍正常的电压波动，同时，具备使能端，可以在需要时，被核心电路开启和关闭。The configurable power supply voltage monitoring and protection circuit provided by the embodiment of the present invention solves the abnormal state of monitoring power failure and undervoltage, and sends a detection signal to notify the working circuit to protect data security and avoid data error and data loss. At the same time, the circuit itself has a simple structure, occupies a small chip area, consumes very low power consumption, does not affect the normal working state of the chip, and can tolerate normal voltage fluctuations. The core circuit turns on and off.
附图说明Description of drawings
图1为本发明实施例可配置电源电压监测电路的结构图；1 is a structural diagram of a configurable power supply voltage monitoring circuit according to an embodiment of the present invention;
图2为本发明实施例滞回比较器电路结构图；FIG. 2 is a structural diagram of a hysteresis comparator circuit according to an embodiment of the present invention;
图3为本发明实施例可配置分压电路的电路结构示意图；3 is a schematic diagram of a circuit structure of a configurable voltage divider circuit according to an embodiment of the present invention;
图4为本发明实施例电路功能时序图。FIG. 4 is a functional sequence diagram of a circuit according to an embodiment of the present invention.
具体实施方式Detailed ways
为使本发明实施例的目的、技术方案和优点更加清楚，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
本发明提供一种可配置的电源电压监测保护电路，如图1所示，由带隙基准11，可配置分压电路12、滞回比较电路14以及电平锁存器13组成，其中，The present invention provides a configurable power supply voltage monitoring and protection circuit, as shown in FIG. 1 , which is composed of a bandgap reference 11 , a configurable voltage divider circuit 12 , a hysteresis comparison circuit 14 and a level latch 13 , wherein,
所述带隙基准11，其一端所述滞回比较电路14相连，能引出基准电压，供所述滞回比较电路14使用；One end of the bandgap reference 11 is connected to the hysteresis comparison circuit 14, and can draw out a reference voltage for the hysteresis comparison circuit 14 to use;
所述可配置分压电路12，其一端与所述滞回比较电路14相连，对电源电压进行采样，得到采样电压；One end of the configurable voltage divider circuit 12 is connected to the hysteresis comparison circuit 14 to sample the power supply voltage to obtain the sampled voltage;
可选地，如图3所示，为可配置分压电路的电路结构示意图，采用电阻串配合开关阵列完成电源电压的采样输出，这种方法简单可靠，响应速度快，线性度好。Optionally, as shown in FIG. 3 , which is a schematic diagram of the circuit structure of a configurable voltage divider circuit, a resistor string and a switch array are used to complete the sampling output of the power supply voltage. This method is simple and reliable, with fast response speed and good linearity.
所述滞回比较电路14，其特征在于，其一端与所述带隙基准11相连，另一端与所述可配置分压电路12相连，对基准电压与采样电压进行比较，得到监测信号；The hysteresis comparison circuit 14 is characterized in that one end thereof is connected to the bandgap reference 11, and the other end is connected to the configurable voltage divider circuit 12, and the reference voltage is compared with the sampled voltage to obtain a monitoring signal;
可选地，如图2所示，为滞回比较电路结构图，从图中可以看出，使能信号为低电平有效。使能有效时，当电源电压下降至低于监测点减去下容限对应的数值后，监测信号输出低电平，通知系统电路电源电压异常，当电源电压上升至高于监测点加上上容限对应的数值后，监测信号恢复为高电平，通知系统电压恢复正常。Optionally, as shown in FIG. 2 , which is a structural diagram of a hysteresis comparison circuit, it can be seen from the figure that the enable signal is active at a low level. When the enable is valid, when the power supply voltage drops below the monitoring point minus the value corresponding to the lower tolerance, the monitoring signal outputs a low level to notify the system circuit that the power supply voltage is abnormal. When the power supply voltage rises above the monitoring point plus the upper tolerance After the corresponding value is limited, the monitoring signal returns to a high level, notifying the system that the voltage returns to normal.
所述电平锁存器13，其一端与所述可配置分压电路12相连，另一端与所述滞回比较电路14相连；One end of the level latch 13 is connected to the configurable voltage divider circuit 12, and the other end is connected to the hysteresis comparison circuit 14;
如图4所示，为本发明实施例的功能时序图，从图中可以看出，使能信号为低电平有效。使能有效时，当电源电压下降至低于监测点减去下容限对应的数值后，监测信号输出低电平，通知系统电路电源电压异常，当电源电压上升至高于监测点加上上容限对应的数值后，监测信号恢复为高电平，通知系统电压恢复正常。As shown in FIG. 4 , which is a functional sequence diagram of an embodiment of the present invention, it can be seen from the figure that the enable signal is active at a low level. When the enable is valid, when the power supply voltage drops below the monitoring point minus the value corresponding to the lower tolerance, the monitoring signal outputs a low level to notify the system circuit that the power supply voltage is abnormal. When the power supply voltage rises above the monitoring point plus the upper tolerance After the corresponding value is limited, the monitoring signal returns to a high level, notifying the system that the voltage returns to normal.
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到的变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应该以权利要求的保护范围为准。The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art who is familiar with the technical scope disclosed by the present invention can easily think of changes or substitutions. All should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
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Cited By (2)
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| CN111463799A (en) * | 2020-04-09 | 2020-07-28 | 云南电网有限责任公司电力科学研究院 | Power supply device and power supply method of voltage monitor |
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