CN109787188A - Configurable supply voltage monitoring and protecting circuit - Google Patents
Configurable supply voltage monitoring and protecting circuit Download PDFInfo
- Publication number
- CN109787188A CN109787188A CN201811593904.4A CN201811593904A CN109787188A CN 109787188 A CN109787188 A CN 109787188A CN 201811593904 A CN201811593904 A CN 201811593904A CN 109787188 A CN109787188 A CN 109787188A
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- circuit
- supply voltage
- configurable
- voltage
- monitoring
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Abstract
The present invention provides a kind of configurable supply voltage monitoring and protecting circuits.The configurable supply voltage monitoring and protecting circuit includes band-gap reference; configurable bleeder circuit, hysteresis comparison circuit and level latch; the supply voltage of chip can be monitored in real time in supply voltage monitoring circuit of the present invention; once there is power down, under-voltage phenomenon in voltage; indication signal will be issued; on-chip circuit can use the preservation that this signal completes significant data, re-reads data when system re-powers or voltage restores normal, works on.
Description
Technical field
The present invention relates to a kind of semiconductor integrated circuit, especially for data to be preserved with high requirement, especially want
It asks when supply voltage is abnormal, such as when unexpected power down, data acquisition, process record and the sensing that data cannot be destroyed
The integrated circuit of measurement.
Background technique
It is being acquired for data, in the integrated circuit of process record and sensing measurement, generally can all there is internal data
Storage unit, the physical security of these data directly determines the stability of system, particularly important.The wave of chip power voltage
Dynamic, especially unexpected power down process, is one of the most important factor for destroying data, and in order to guarantee data security, there are two types of modes
This is solved the problems, such as, first is that increasing the stability that equipment guarantees power supply outside piece, such as outside continued power system or big piece
Emergency power supply, but there is also certain emergency risks for this equipment itself, second is that being guaranteed by increasing necessary function module in piece
After voltage leaves normal range (NR), chip system obtains this information and timely temporal data, avoids loss of data, and mode is second is that number
According to last one of barrier of safety and required safety measure.Therefore, essential to piece interior power voltage.Prison in piece
Slowdown monitoring circuit needs to complete down Monitor Unit and under-voltage monitoring, not only can accurately detect and issue in time the detection signal of electric voltage exception,
Also to allow the normal fluctuation of supply voltage, while guarantee extremely low chip area cost and power consumption cost.
Summary of the invention
The present invention provides a kind of monitoring and protecting circuit for supply voltage configurable in chip, is made of four parts: band
Gap benchmark, configurable bleeder circuit, hysteresis loop comparator and level latch.
Wherein,
The band-gap reference, hysteresis comparison circuit described in one end are connected, can draw reference voltage, compare for the hysteresis
Circuit uses；
The configurable bleeder circuit, one end are connected with the hysteresis comparison circuit, sample, obtain to supply voltage
To sampled voltage；
The hysteresis comparison circuit, one end are connected with the band-gap reference, the other end and the configurable bleeder circuit
It is connected, reference voltage is compared with sampled voltage, obtains monitoring signals；
The level latch, one end are connected with the configurable bleeder circuit, and the other end is electric compared with the hysteresis
Road is connected.
Optionally, the configurable bleeder circuit, the ratio of adjustable sampled voltage and supply voltage.
Optionally, when not needing monitoring supply voltage, the level latch can guarantee to control the stabilization of signal, make
Circuit keeps normal operating conditions.
Optionally, the configurable supply voltage monitoring circuit can receive control signal and enable signal, not need
It, can be with shutdown detecting circuit by enable end when monitoring supply voltage.
Configurable supply voltage monitoring and protecting circuit provided in an embodiment of the present invention solves monitoring power supply power-fail and under-voltage
Abnormality, and detection signal is issued, it notifies operating circuit to protect data safety, avoids the feelings of error in data and loss of data
Condition.Meanwhile circuit itself has simple structure, occupies lesser chip area, consumption power consumption is extremely low, is not influencing chip just
Normal working condition can tolerate normal voltage fluctuation, meanwhile, have enable end, can when needed, by core circuit open and
It closes.
Detailed description of the invention
Fig. 1 is the structure chart that the embodiment of the present invention can configure supply voltage monitoring circuit；
Fig. 2 is hysteresis loop comparator of embodiment of the present invention circuit structure diagram；
Fig. 3 is the electrical block diagram that the embodiment of the present invention can configure bleeder circuit；
Fig. 4 is circuit function of embodiment of the present invention timing diagram.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is only
It is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
The present invention provides a kind of configurable supply voltage monitoring and protecting circuit, as shown in Figure 1, by band-gap reference 11, it can
Bleeder circuit 12, hysteresis comparison circuit 14 and level latch 13 is configured to form, wherein
The band-gap reference 11, hysteresis comparison circuit 14 described in one end are connected, and reference voltage can be drawn, for the hysteresis
Comparison circuit 14 uses；
The configurable bleeder circuit 12, one end are connected with the hysteresis comparison circuit 14, adopt to supply voltage
Sample obtains sampled voltage；
Optionally, as shown in figure 3, to can configure the electrical block diagram of bleeder circuit, combination switch is matched using resistance string
Array completes the sampling output of supply voltage, and this method is simple and reliable, fast response time, and the linearity is good.
The hysteresis comparison circuit 14, which is characterized in that one end is connected with the band-gap reference 11, the other end with it is described
Configurable bleeder circuit 12 is connected, and is compared to reference voltage with sampled voltage, obtains monitoring signals；
Optionally, as shown in Fig. 2, being hysteresis comparison circuit structure chart, it can be seen from the figure that enable signal is low level
Effectively.When enabling effective, after supply voltage, which is decreased below monitoring point, subtracts lower tolerance corresponding numerical value, monitoring signals output
Low level, notice circuit system supply voltage is abnormal, when supply voltage rises to higher than monitoring point plus the corresponding number of upper tolerance
After value, monitoring signals revert to high level, and notice system voltage restores normal.
The level latch 13, one end are connected with the configurable bleeder circuit 12, the other end and the hysteresis ratio
It is connected compared with circuit 14；
As shown in figure 4, being the function timing diagram of the embodiment of the present invention, it can be seen from the figure that enable signal is low level
Effectively.When enabling effective, after supply voltage, which is decreased below monitoring point, subtracts lower tolerance corresponding numerical value, monitoring signals output
Low level, notice circuit system supply voltage is abnormal, when supply voltage rises to higher than monitoring point plus the corresponding number of upper tolerance
After value, monitoring signals revert to high level, and notice system voltage restores normal.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those familiar with the art, all answers
It is included within the scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (4)
1. a kind of configurable supply voltage monitoring and protecting circuit, including band-gap reference can configure bleeder circuit, hysteresis comparison circuit
And level latch, wherein
The band-gap reference, which is characterized in that hysteresis comparison circuit described in one end is connected, and reference voltage can be drawn, for described
Hysteresis comparison circuit uses；
The configurable bleeder circuit, which is characterized in that one end is connected with the hysteresis comparison circuit, carries out to supply voltage
Sampling, obtains sampled voltage；
The hysteresis comparison circuit, which is characterized in that one end is connected with the band-gap reference, and the other end and described can configure are divided
Volt circuit is connected, and is compared to reference voltage with sampled voltage, obtains monitoring signals；
The level latch, which is characterized in that one end is connected with the configurable bleeder circuit, the other end and the hysteresis
Comparison circuit is connected.
2. configurable supply voltage monitoring and protecting circuit according to claim 1, which is characterized in that the configurable partial pressure
Circuit, the ratio of adjustable sampled voltage and supply voltage.
3. configurable supply voltage monitoring and protecting circuit according to claim 1, which is characterized in that electric when not needing monitoring
When the voltage of source, the level latch can guarantee to control the stabilization of signal, and circuit is made to keep normal operating conditions.
4. configurable supply voltage monitoring and protecting circuit according to claim 1, which is characterized in that the supply voltage prison
Surveying protection circuit can receive control signal and enable signal, when not needing monitoring supply voltage, can be closed by enable end
Close detection circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593904.4A CN109787188A (en) | 2018-12-25 | 2018-12-25 | Configurable supply voltage monitoring and protecting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811593904.4A CN109787188A (en) | 2018-12-25 | 2018-12-25 | Configurable supply voltage monitoring and protecting circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109787188A true CN109787188A (en) | 2019-05-21 |
Family
ID=66498337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811593904.4A Pending CN109787188A (en) | 2018-12-25 | 2018-12-25 | Configurable supply voltage monitoring and protecting circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109787188A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
| 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 |
-
2018
- 2018-12-25 CN CN201811593904.4A patent/CN109787188A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110231508A (en) * | 2019-07-09 | 2019-09-13 | 和记奥普泰通信技术有限公司 | Packetizing OTN, PTN, IPRAN, SPN and PON device looses power alarm detection method |
| 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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