CN111426866B - Voltage monitoring system and method thereof - Google Patents
Voltage monitoring system and method thereof Download PDFInfo
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- CN111426866B CN111426866B CN201911392637.9A CN201911392637A CN111426866B CN 111426866 B CN111426866 B CN 111426866B CN 201911392637 A CN201911392637 A CN 201911392637A CN 111426866 B CN111426866 B CN 111426866B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0084—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring voltage only
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- H03K—PULSE TECHNIQUE
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Abstract
The invention provides a voltage monitoring system and a method thereof, which are used for monitoring a power supply voltage provided for a functional circuit, the voltage monitoring system comprises a clock signal generating circuit, a reference voltage generating circuit and a low voltage resetting module, wherein the clock signal generating circuit generates a clock signal, the reference voltage generating circuit generates a reference voltage and updates the reference voltage according to the clock signal, in a normal mode, the low voltage resetting module continuously executes a voltage detection function for detecting whether the power supply voltage is lower than a first voltage threshold value, and when the power supply voltage is lower than the first voltage threshold value, the low voltage resetting module outputs a resetting signal to reset the functional circuit; in the power saving mode, the low voltage reset module periodically and discontinuously executes a voltage detection function according to the clock signal.
Description
Technical Field
The present invention relates to a voltage monitoring system, and more particularly, to a voltage monitoring system with low power consumption and low voltage reset detection function and a method thereof.
Background
In order to prolong the service life of most battery-powered devices, a Power-saving mode (also called a Power-down mode) is usually entered when a functional circuit (functional circuit) is not operating, so as to reduce Power consumption.
In addition, since the voltage of the battery-powered power source decreases with time, in order to avoid the functional circuit from being damaged due to the excessively low voltage drop of the power source, a low-voltage reset (LVR) circuit is provided to monitor whether the voltage of the power source is lower than a voltage threshold, and if so, the LVR circuit outputs a reset signal to reset the functional circuit, thereby protecting the functional circuit.
However, in the power saving mode, the power consumption of the low voltage reset circuit needs to be further reduced to more effectively prolong the service time of the battery.
Disclosure of Invention
The present invention is directed to a voltage monitoring system with low power consumption and suitable for power saving mode, so as to solve the above-mentioned problems.
To achieve the above objectives, the present invention provides a voltage monitoring system for monitoring a power supply voltage provided to a functional circuit. The voltage monitoring system comprises a clock signal (clock signal) generating circuit, a reference voltage generating circuit and a low voltage reset module. The clock signal generating circuit is used for generating a clock signal. The reference voltage generating circuit is used for generating a reference voltage and updating the reference voltage according to the clock signal. In a first mode, the low voltage reset module continuously performs a voltage detection function for detecting whether the power voltage is lower than a first voltage threshold, and when the power voltage is lower than the first voltage threshold, the low voltage reset module outputs a reset signal to reset the functional circuit; in a second mode, the low voltage reset module periodically and discontinuously executes the voltage detection function according to the clock signal. The first voltage threshold corresponds to the reference voltage.
In one embodiment, the low voltage reset module includes a low voltage reset circuit for performing a voltage detection function and a power consumption control unit for periodically turning on or off the low voltage reset circuit according to a clock signal in the second mode.
In one embodiment, the power consumption control unit comprises a first judging unit which generates a starting signal of the low-voltage reset circuit according to the clock signal and a starting condition.
In one embodiment, the power consumption control unit comprises a second determining unit for generating a mask signal for masking the output signal of the low voltage reset circuit according to the clock signal and a mask condition.
In one embodiment, in the second mode, the low voltage reset module periodically and discontinuously performs the voltage detecting function according to a first frequency when the power voltage is lower than a second voltage threshold, and periodically and discontinuously performs the voltage detecting function according to a second frequency when the power voltage is higher than the second voltage threshold, wherein the second frequency is lower than the first frequency.
In one embodiment, the clock signal generating circuit includes an oscillator outputting an oscillation signal and a counter counting according to the oscillation signal and periodically generating an update signal to the reference voltage generating circuit according to a predetermined count.
In one embodiment, the clock signal generating circuit includes an oscillator and a counter, the oscillator outputs an oscillation signal, the counter performs counting according to the oscillation signal, and the power consumption control unit includes a first determining unit that controls the low voltage reset circuit to be in an on state or an off state according to an on condition and a count value output by the counter.
In one embodiment, the first mode is a normal mode, and the second mode is a power saving mode.
To achieve the above objectives, the present invention provides a voltage monitoring method for monitoring a power supply voltage provided to a functional circuit. The voltage monitoring method comprises providing a clock signal generating circuit to generate a clock signal; providing a reference voltage generating circuit to generate a reference voltage, wherein the reference voltage generating circuit updates the reference voltage according to the clock signal; providing a low voltage reset module to perform a voltage detection function for detecting whether the power voltage is lower than a first voltage threshold, wherein the low voltage reset module outputs a reset signal to reset the functional circuit when the power voltage is lower than the first voltage threshold, and the first voltage threshold corresponds to the reference voltage; in a first mode, the low voltage reset module is used for continuously executing the voltage detection function; in a second mode, the low voltage reset module is used for periodically and discontinuously executing the voltage detection function according to the clock signal.
In one embodiment, the voltage monitoring method further comprises generating a mask signal for masking the output signal of the low voltage reset module according to the clock signal and a mask condition.
Drawings
FIG. 1 is a block diagram of a voltage monitoring system according to the present invention;
FIG. 2 is a block diagram of a voltage monitoring system according to an embodiment of the present invention;
FIG. 3 is a block diagram illustrating a power consumption control unit of the voltage monitoring system according to an embodiment of the present invention;
FIG. 4 is a timing diagram of operation signals of an embodiment of a power consumption control unit of the voltage monitoring system of the present invention;
FIG. 5 is a timing diagram of operation signals of an embodiment of the voltage monitoring system of the present invention;
FIG. 6 is a timing diagram of the operation signals of another embodiment of the voltage monitoring system of the present invention;
FIG. 7 is a flow chart of a voltage monitoring method of the present invention;
FIG. 8 is a flowchart illustrating a voltage monitoring method according to an embodiment of the present invention.
[ description of symbols ]
10 voltage stabilizing circuit
101 operating voltage
11: linear low dropout circuit
20 low voltage reset module
21 low voltage reset circuit
211. TH1 first voltage threshold
212 output signal
22 power consumption control unit
221. 231 start signal
23. 23a first judging unit
24. 24a second judging unit
241 mask signal
25 selection unit
26 OR gate
Reference voltage generating circuit
301. 311 reference voltage
31 bandgap circuit
40 clock signal generating circuit
401 clock signal
41 oscillator
411 oscillating signal
42 counter
421 count value
422, update signal
50 functional circuit
VDD power supply voltage
TH2 second voltage threshold
T0 to T8, period
P0-P5 time points
EN starting signal input terminal
Detailed Description
The following detailed description of the embodiments of the present invention will be provided in conjunction with the drawings and examples, so that how to implement the technical means for solving the technical problems and achieving the technical effects of the present invention can be fully understood and implemented.
Please refer to fig. 1, which is a block diagram of a voltage monitoring system according to the present invention. As shown in fig. 1, the voltage monitoring system of the present invention is suitable for a power system. The power supply system comprises a voltage stabilizing circuit 10, an input terminal of the voltage stabilizing circuit 10 is electrically connected to a power supply terminal, and the voltage stabilizing circuit 10 can convert a power supply voltage VDD at the power supply terminal into an operating voltage 101 required by the functional circuit 50. In one embodiment, the voltage regulator circuit 10 can be a linear Low Dropout (LDO) circuit.
In practical applications, the power system is usually disposed on a mobile device, and a battery is used as a power source, so that the voltage of the battery gradually decreases after a long time of use. When the power supply voltage VDD is lower than a voltage threshold, the functional circuit 50 of the mobile device may be damaged or not function properly. Therefore, the voltage monitoring system of the present invention can monitor the power supply voltage VDD and has lower power consumption.
As shown in fig. 1, the voltage monitoring system includes a clock signal generating circuit 40, a reference voltage generating circuit 30, and a low voltage reset module 20. Clock signal generation circuitry 40 may generate clock signal 401. The reference voltage generating circuit 30 may generate the reference voltage 301 and update the reference voltage 301 according to the clock signal 401. In one embodiment, the reference voltage generating circuit 30 may be a Bandgap (Bandgap) circuit; the clock signal generating circuit 40 may include an oscillator 41 and a counter 42. The low voltage reset module 20 and the reference voltage generating circuit 30 share the clock signal 401 of the clock signal generating circuit 40, which can synchronize the Bandgap refresh (Bandgap refresh) time of the low voltage reset module 20 and the reference voltage generating circuit 30 and also save the logic gate count (gate count).
The low voltage reset module 20 may perform a voltage detection function to detect whether the power voltage VDD is lower than the first voltage threshold 211, and when the low voltage reset module 20 determines that the power voltage VDD is lower than the first voltage threshold 211, the low voltage reset module 20 outputs a reset (reset) signal 201 to reset the functional circuit 50, thereby preventing the functional circuit 50 from being damaged or malfunctioning. The mobile device usually has a normal mode and a power saving mode, in the normal mode, in order to ensure the normal function, the functional circuit 50 operates normally and consumes higher power; in the power saving mode, the functional circuit 50 is turned off or sleep to reduce power consumption for a long time.
In one embodiment, the low voltage reset module 20 may include a low voltage reset circuit 21 and a power consumption control unit 22, the low voltage reset circuit 21 is configured to perform the voltage detection function, and the power consumption control unit 22 may periodically turn on or off the low voltage reset circuit 21 according to the clock signal 401 in the power saving mode.
Since the power consumption of the low voltage reset module 20 is much lower than that of the functional circuit 50, in the normal mode, the low voltage reset module 20 can continuously perform the voltage detection function to immediately detect whether the power system has a sudden voltage drop. In the power saving mode, in order to further reduce the power consumption of the low voltage reset module 20, the low voltage reset module 20 may periodically and discontinuously perform the voltage detection function according to the clock signal 401; in other words, the voltage detection function is performed intermittently, and when the voltage detection function is not performed, the power consumption of the low-voltage reset module 20 is very low, thereby effectively reducing the power consumption of the low-voltage reset module 20 in the power saving mode.
It should be noted that the first voltage threshold 211 corresponds to the reference voltage 301, that is, the first voltage threshold 211 can be obtained from the reference voltage 301, for example, the low voltage reset module 20 can include a voltage dividing circuit for dividing the reference voltage 301 to obtain the first voltage threshold 211, the first voltage threshold 211 can be, for example, 1.5V, the first voltage threshold 211 of 1.5V is merely an example, and the first voltage threshold 211 can be other values without limiting the scope of the invention; in another embodiment, the low voltage reset module 20 may use a plurality of voltage thresholds, and a plurality of voltage dividing circuits may divide the reference voltage 301 to obtain different voltage thresholds. Techniques for this are well known to those skilled in the art and will not be described in detail herein.
Please refer to fig. 5, which is a timing diagram illustrating operation signals of the voltage monitoring system according to an embodiment of the present invention. In the figure, before the time point P0, the voltage monitoring system is in the normal mode, so the voltage detection function is continuously performed; after the time point P0, the voltage monitoring system enters the power saving mode, the voltage detection function is performed intermittently, i.e., the voltage monitoring system performs the voltage detection function only during the periods T0, T1, T2, T3, and T4, and turns off the voltage detection function during other periods, thereby effectively reducing power consumption. As shown in fig. 5, when the voltage monitoring system performs the voltage detection function during the period T4, it can detect that the power voltage VDD is lower than the first voltage threshold TH1, and the low voltage reset module 20 sends a reset signal 201 to the functional circuit 50.
Fig. 2 to 4 are block schematic diagrams of a voltage monitoring system according to an embodiment of the present invention, a power consumption control unit according to an embodiment of the present invention, and a timing diagram of operation signals. In this embodiment, the voltage monitoring system includes a low voltage reset circuit 21, a first determining unit 23, a second determining unit 24, a selecting unit 25, a Bandgap (Bandgap) circuit 31, an oscillator 41 and a counter 42. The low voltage reset circuit 21 is used to perform the voltage detection function, and the bandgap circuit 31 can output a reference voltage 311 to the low voltage reset circuit 21.
The oscillator 41 is configured to output an oscillation signal 411, which is a periodic signal. The counter 42 counts according to the oscillating signal 411 and periodically generates an update signal 422 to the reference voltage generating circuit 30 according to a predetermined counting amount (preset). For example, the pre-designed number may be 1000, the counter 42 may count 1000 times and return to zero, and output the update signal 422; thus, the period (period) of the refresh signal 422 is 1000 times the oscillating signal 411, and the frequency of the oscillating signal 411 is 1000 times the refresh signal 422, the counter 42 can be a frequency divider or a frequency down-converter. The above "1000 times" is merely an example and not a limitation of the present invention; in practical applications, the user can set the multiple relationship between the frequencies of the update signal 422 and the oscillation signal 411 by himself.
The first determining unit 23 can generate an enable signal 231 of the low voltage reset circuit 21 according to the clock signal 401 and an enable condition. Since the low voltage reset circuit 21 performs the voltage detection function intermittently and periodically in the power saving mode, in an embodiment, the start condition may be that when the count value is in a specific range, the first determining unit 23 generates the start signal 231 to the start signal input end EN of the low voltage reset circuit 21, and the low voltage reset circuit 21 is started to perform the voltage detection function to determine whether the reset signal is generated; at the count value outside the specific range, the first determining unit 23 does not generate the start signal 231, so the low voltage reset circuit 21 does not perform the voltage detecting function, thereby achieving the effect of saving power consumption.
In one embodiment, the start condition may be set to "count value is less than or equal to 2", so when the count value is 0, the first determining unit 23 generates the start signal 231 to the start signal input EN of the low voltage reset circuit 21 to start the low voltage reset circuit 21 to perform the voltage detecting function, when the count values are 0, 1, and 2, the start signal 231 is at high level, so that the low voltage reset circuit 21 starts to perform the voltage detecting function, and at other count values, the start signal 231 is at low level, so that the low voltage reset circuit 21 is not started and consumes no energy. Therefore, the effect of periodically turning on and off the low voltage reset circuit 21 to reduce power consumption can be achieved.
The low voltage reset circuit 21 performs the voltage detection function to protect the functional circuit 50, and therefore the output signal of the low voltage reset circuit 21 must have high accuracy, but the low voltage reset circuit 21 is frequently turned on and off periodically in the power-saving mode, and the low voltage reset circuit 21 requires a standby time when it is turned on, and the output signal of the low voltage reset circuit 21 is meaningless during the standby time and cannot be provided to the functional circuit 50. Therefore, in one embodiment, the second determining unit 24 can generate a masking signal 241 for masking the output signal 212 of the low voltage reset circuit 21 according to the clock signal 401 and a masking condition. The masking condition corresponds to the period when the low voltage reset circuit 21 is just turned on, so as to prevent the functional circuit 50 from malfunction due to the transmission of an insignificant signal to the functional circuit 50.
The selection unit 25 receives the mask signal 241 and the output signal 212 of the low voltage reset circuit 21, and when the selection unit 25 receives the mask signal 241 or the mask signal 241 is in an enabled state (enabled state), the selection unit does not output the output signal 212 of the low voltage reset circuit 21; on the contrary, when the selection unit 25 does not receive the mask signal 241 or the mask signal 241 is in the disabled state, the output signal 212 of the low voltage reset circuit 21 is output. In one embodiment, the masking condition may be "count value equal to 0", so that when the count value 421 is 0, the masking signal 241 is at high level, which is an enabled state, so that the selection unit 25 does not output the output signal 212 of the low voltage reset circuit 21, as shown in fig. 4.
Therefore, in one embodiment, when the preset count of the counter 42 is set to 1000 and the start condition is set to "count value is less than or equal to 2", in the power saving mode, when the count values are 0, 1, and 2, the first determining unit 23 generates the high-level start signal 231 to the start signal input terminal EN of the low-voltage reset circuit 21 to start the low-voltage reset circuit 21 to perform the voltage detection function, and when the count values are 3 to 999, the first determining unit 23 generates the high-level start signal 231, the low-voltage reset circuit 21 does not perform the voltage detection function, then the count value returns to zero, and the above operations are repeated, thereby monitoring the state of the power supply voltage and reducing power consumption. In addition, in another embodiment, the voltage monitoring system can add the second determining unit 24 and set the mask condition to "the count value is equal to 0", so when the count value is 0, the selecting unit 25 does not output the output signal of the low voltage reset circuit 21, so as to avoid malfunction of the functional circuit 50.
Fig. 3 is a block diagram of an embodiment of a power consumption control unit according to the present invention, which is implemented by the selection unit 25 or the gate 26, and the enable state of the reset signal 201 is a low level L, such as a ground voltage. The start condition of the first determining unit 23a is "count value is less than or equal to 2", and the masking condition of the second determining unit 24a is "count value is equal to 0", so that when the count value 421 is 0, the first determining unit 23a outputs the high level signal H, the low voltage reset circuit 21 is started, and the second determining unit 24a also outputs the high level signal H, so that the functional circuit 50 is not reset no matter the output signal of the low voltage reset circuit 21 is H or L, or the reset signal 201 of the gate 26 is H, which is the disable state of the reset signal 201, thereby achieving the effect of shielding the signal generated when the low voltage reset circuit 21 is just started.
When the count value 421 is 1, the first determining unit 23a outputs the high level signal H, and the second determining unit 24a outputs the low level signal L, so the reset signal 201 of the or gate 26 corresponds to the output signal 212 of the low voltage reset circuit 21. When the low voltage reset circuit 21 detects that the power voltage is lower than the voltage threshold, the low voltage reset circuit 21 outputs the low level signal L, so that the reset signal 201 of the or gate 26 is the low level signal L, which is the enabled state of the reset signal 201, and thus the functional circuit 50 is reset; on the contrary, the low voltage reset circuit 21 detects that the power voltage is higher than the voltage threshold, the low voltage reset circuit 21 outputs the high level signal H, and the functional circuit 50 is not reset.
Please refer to fig. 6, which is a timing diagram illustrating operation signals of a voltage monitoring system according to another embodiment of the present invention. This embodiment is different from the previous embodiments in that the embodiment uses two voltage thresholds and turns on or off the low voltage reset circuit 21 at different frequencies in different stages. As shown in fig. 6, the voltage monitoring system of this embodiment uses a first voltage threshold TH1 and a second voltage threshold TH2, and the second voltage threshold TH2 is higher than the first voltage threshold TH1. In the power saving mode (i.e., after the time point P3), when the power voltage VDD is higher than the second voltage threshold TH2 (i.e., between the time point P3 and the time point P4), the low-voltage reset module 20 may periodically and discontinuously perform the voltage detection function according to a second frequency; when the power voltage VDD is lower than the second voltage threshold TH2 (i.e., after the time point P4), the low voltage reset module 20 may periodically and discontinuously perform the voltage detection function according to a first frequency, and the second frequency is lower than the first frequency.
As shown in fig. 6, between time point P3 and time point P4, the voltage detection function is executed in periods T0, T1, and T2, and is not executed in the other periods; and after the time point P4, the voltage detection function is performed during the periods T3, T4, T5, T6, T7, T8, and it may be detected during the period T8 that the power supply voltage is lower than the first voltage threshold TH1. Since the voltage detection function is closer to the first voltage threshold TH1, the voltage detection function is performed more frequently to confirm that the timing when the power voltage is lower than the first voltage threshold TH1 can be detected in time, and to issue the reset signal to protect the functional circuit.
Please refer to fig. 7, which is a flowchart illustrating a voltage monitoring method according to the present invention. The voltage monitoring method of the present invention is used for monitoring a power voltage provided to a functional circuit, and the voltage monitoring method includes steps S71 to S76. In step S71, a clock signal generating circuit is provided to generate a clock signal. In step S72, a reference voltage generating circuit is provided to generate a reference voltage, and the reference voltage generating circuit updates the reference voltage according to the clock signal. In step S73, a low voltage reset module is provided to perform a voltage detection function for detecting whether the power voltage is lower than a first voltage threshold, and when the power voltage is lower than the first voltage threshold, the low voltage reset module outputs a reset signal to reset the functional circuit, wherein the first voltage threshold 211 corresponds to the reference voltage 301.
In step S74, it is determined whether to enter the power saving mode, and if so, step S75 is executed; if not, go to step S76. In step S75, the low voltage reset module is used to periodically and discontinuously perform the voltage detection function according to the clock signal 401. In step S76, the voltage detection function is continuously performed using the low voltage reset module. The clock signal generating circuit, the reference voltage generating circuit, the low voltage reset module and the related operations are already described in the foregoing description, and therefore are not described herein again.
Please refer to fig. 8, which is a flowchart illustrating a voltage monitoring method according to an embodiment of the present invention. The operation of the embodiment of the voltage monitoring method in the power saving mode will be described below, and the operation in the normal mode is similar to that described in fig. 7, and therefore will not be described again. As shown in FIG. 8, the embodiment of the voltage monitoring method includes steps S81-S84.
In step S81, a bandgap circuit, an oscillator and a counter are provided, the oscillator outputs an oscillation signal, the counter counts according to the oscillation signal, the bandgap circuit generates a reference voltage, and the reference voltage is updated according to the clock signal.
In step S82, a low voltage reset module is provided to perform a voltage detection function to determine whether a reset signal is outputted. In step S83, a first determining unit is provided, a start condition of the first determining unit is set, and a start signal of the low voltage reset circuit is generated according to the count value of the counter and the start condition by using the first determining unit.
In step S84, a second determining unit is provided, and a masking condition of the second determining unit is set, and a masking signal for masking the output of the low voltage reset circuit is generated according to the count value of the counter and the masking condition by using the second determining unit. In step S85, the on state and the off state of the low voltage reset module are periodically controlled according to the enable signal and the mask signal.
In one embodiment, as shown in fig. 4, the pre-designed number of the counters may be set to 1000, the start condition may be set to "the count value is less than or equal to 2", and the mask condition may be set to "the count value is equal to 0", in the power saving mode, when the count value is 0, 1, or 2, the first determining unit generates the high level start signal to the start signal input terminal of the low voltage reset circuit, and starts the low voltage reset circuit to perform the voltage detection function, and when the count value is 0, the selecting unit does not output the output signal of the low voltage reset circuit, so as to avoid malfunction of the functional circuit. When the counting value is 3-999, the first judging unit generates a high-level starting signal, the low-voltage resetting circuit does not execute the voltage detection function, then the counting value returns to zero, and the operations are repeated, so that the power consumption is reduced while the state of the power supply voltage is monitored, and the problem that the initial signal is unstable to cause malfunction of the functional circuit due to frequent starting of the low-voltage resetting circuit is avoided. It should be noted that the preset count number, the start condition and the mask condition of the counter are only examples and are not limited.
Although the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A voltage monitoring system for monitoring a power supply voltage provided to a functional circuit, the voltage monitoring system comprising:
a clock signal generating circuit for generating a clock signal;
a reference voltage generating circuit for generating a reference voltage and updating the reference voltage according to the clock signal; and
a low voltage reset module, in a first mode, continuously performing a voltage detection function to detect whether the power voltage is below a first voltage threshold, the low voltage reset module outputting a reset signal to reset the functional circuit when the power voltage is below the first voltage threshold, in a second mode, the low voltage reset module periodically and discontinuously performing the voltage detection function according to the clock signal, wherein the first voltage threshold corresponds to the reference voltage, wherein,
the low voltage reset module comprises a low voltage reset circuit and a power consumption control unit, wherein the low voltage reset circuit is used for executing the voltage detection function, the power consumption control unit periodically turns on or off the low voltage reset circuit according to the clock signal in the second mode, the power consumption control unit comprises a first judgment unit and a second judgment unit, and the second judgment unit generates a mask signal for shielding the output signal of the low voltage reset circuit according to the clock signal and a mask condition.
2. The voltage monitoring system of claim 1, wherein the first determining unit generates an enable signal of the low voltage reset circuit according to the clock signal and an enable condition.
3. The voltage monitoring system of claim 1, wherein in the second mode, the low voltage reset module periodically and discontinuously performs the voltage detection function according to a first frequency when the power voltage is below a second voltage threshold, and periodically and discontinuously performs the voltage detection function according to a second frequency when the power voltage is above a second voltage threshold, wherein the second frequency is lower than the first frequency.
4. The voltage monitoring system of claim 1, wherein the clock signal generating circuit comprises an oscillator and a counter, the oscillator outputting an oscillating signal, the counter counting according to the oscillating signal and periodically generating an update signal to the reference voltage generating circuit according to a predetermined count.
5. The voltage monitoring system of claim 1, wherein the clock signal generating circuit comprises an oscillator and a counter, the oscillator outputs an oscillating signal, the counter counts according to the oscillating signal, the power consumption control unit comprises a first determining unit, and the first determining unit controls the low voltage reset circuit to be in an on state or an off state according to an on condition and a count value output by the counter.
6. The voltage monitoring system of claim 1, wherein the first mode is a normal mode and the second mode is a power-saving mode.
7. A voltage monitoring method for monitoring a power supply voltage provided to a functional circuit, the voltage monitoring method comprising:
providing a clock signal generating circuit to generate a clock signal;
providing a reference voltage generating circuit to generate a reference voltage, wherein the reference voltage generating circuit updates the reference voltage according to the clock signal;
providing a low voltage reset module to perform a voltage detection function for detecting whether the power voltage is lower than a first voltage threshold, wherein the low voltage reset module outputs a reset signal to reset the functional circuit when the power voltage is lower than the first voltage threshold, and the first voltage threshold corresponds to the reference voltage;
in a first mode, continuously executing the voltage detection function by using the low voltage reset module; in a second mode, the low voltage reset module is used for periodically and discontinuously executing the voltage detection function according to the clock signal; and generating a mask signal for masking the output signal of the low voltage reset module according to the clock signal and a mask condition.
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| TW108101073A TWI688187B (en) | 2019-01-10 | 2019-01-10 | Voltage monitoring system and method thereof |
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| CN111426866A (en) | 2020-07-17 |
| TWI688187B (en) | 2020-03-11 |
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