CN1172191C - Voltage (potential) measurer - Google Patents
Voltage (potential) measurer Download PDFInfo
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- CN1172191C CN1172191C CNB021056129A CN02105612A CN1172191C CN 1172191 C CN1172191 C CN 1172191C CN B021056129 A CNB021056129 A CN B021056129A CN 02105612 A CN02105612 A CN 02105612A CN 1172191 C CN1172191 C CN 1172191C
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- voltage
- potential
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- measurer
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Abstract
The present invention relates to a voltage potential detector which is applied to a position between a power supply and a function circuit, and the voltage potential detector and the function circuit are completed in an integrated circuit chip together. The voltage potential detector comprises a power input terminal electrically connected with the power supply for receiving a high-potential voltage, a voltage division circuit electrically connected with the power supply for receiving the high-potential voltage and carrying out voltage division to obtain a pointer voltage which is lower than the high-potential voltage, and a digital logic arithmetic circuit electrically connected with the power input terminal and the voltage division circuit, wherein the least input voltage value VIH which is determined as high potential is lower than that of the pointer voltage. The present invention can detect the fluctuation of an output voltage of the power supply and send out an alarm signal to the function circuit. Because the present invention is integrated in the integrated circuit chip by adopting a pure digital circuit, the cost can be saved.
Description
Technical field
The present invention relates to a kind of voltage (potential) measurer, refer to a kind of voltage (potential) measurer that is integrated in the integrated circuit (IC) chip especially.
Background technology
Fig. 1 is the function block diagram that the voltage-level detector 12 of a known built-in voltage stabilizing function is applied to a power supply unit 10 and an operating circuit 11, (the microprocessor for example because this operating circuit 11, main memory circuit etc.) need stabilized power source to guarantee that work does not make a mistake, so voltage comparator circuit 122 just carries out the action of following voltage detecting: when in a single day the received power source voltage current potential from power supply unit 10 of Vin pin is lower than the received metastable reference voltage Vref of Vdin pin through divider resistance R1, during the comparison current potential after the R2 dividing potential drop (Vref * R2/ (R1+R2)), voltage comparator circuit 122 judges that just the power supply from power supply unit 10 produces unstable, and then send a caution signal to operating circuit 11 by the Vdout pin, thus, but voltage-level detector 12 goes out power supply with rapid reaction, and unstable phenomenon takes place, and then offers operating circuit 11 references to carry out strain.Again because this operating circuit 11 (for example microprocessor, main memory circuit etc.) needs stable especially and clean power supply, so merge design in the voltage-level detector 12 usually one mu balanced circuit 121 is arranged.
And the voltage-level detector 12 of above-mentioned built-in voltage stabilizing function is become an integrated circuit (IC) by independent design usually, because extra packaging and testing expense must increase the whole required cost of making.
Summary of the invention
The technical problem to be solved in the present invention is to propose a kind of voltage (potential) measurer, under the situation that does not need particular process sequence or circuit layout, just can highly be integrated in acp chip, reaches the demand of saving cost and meeting the system in future chip.
In order to achieve the above object, the invention provides a kind of voltage (potential) measurer, be applied between a power supply unit and the functional circuit, this voltage (potential) measurer and this functional circuit are together finished in an integrated circuit (IC) chip, this voltage (potential) measurer comprises: a power input, be electrically connected on this power supply unit, receive the high-potential voltage that this power supply unit is exported: a bleeder circuit, be electrically connected on this power supply unit, receive this high-potential voltage that this power supply unit exports and carry out dividing potential drop and obtain a pointer voltage, this pointer voltage is lower than this high-potential voltage; An and digital logical operation circuit, its two input end is electrically connected on this power input and this bleeder circuit respectively, the minimum input voltage value VIH of its noble potential of regarding as is lower than this pointer voltage that this bleeder circuit is exported, this high-potential voltage of exporting when this power supply unit produces fluctuation and relatedly this pointer magnitude of voltage is changed and when being lower than VIH, this digital logical operation circuit just sends a caution signal to this functional circuit downwards.
According to above-mentioned conception, in the voltage (potential) measurer of the present invention this digital logical operation circuit be one with the door.
According to above-mentioned conception, this bleeder circuit can be a controlled variable resistance in the voltage (potential) measurer of the present invention, to adjust this pointer magnitude of voltage of being exported.
According to above-mentioned conception, also can comprise in the voltage (potential) measurer of the present invention: a sampling and a holding circuit, be electrically connected on this digital logical operation circuit, export after receiving this caution signal and keeping its voltage potential; And one automatically remove circuit, is electrically connected on this sampling and holding circuit, regularly sends a clear signal to this sampling and holding circuit, and then the output removing with holding circuit of will take a sample.
According to above-mentioned conception, also can comprise a ripple counter in the voltage (potential) measurer of the present invention, be electrically connected on the output terminal of this digital logical operation circuit, respond the triggering of this caution signal and counting upwards.
According to above-mentioned conception, also can comprise a multiplexer in the voltage (potential) measurer of the present invention, be electrically connected between the input end of pointer voltage output end, a reference voltage end and this digital logical operation circuit of this bleeder circuit, can be controlled and select to export this reference voltage or pointer voltage to this digital logical operation circuit.
According to above-mentioned conception, also can comprise a dividing potential drop mask register in the voltage (potential) measurer of the present invention, be electrically connected on this bleeder circuit, store the numerical data of representing this pointer magnitude of voltage, so as to setting this pointer magnitude of voltage that this bleeder circuit is imported.
According to above-mentioned conception, this functional circuit can be a chipset in the voltage (potential) measurer of the present invention.
According to above-mentioned conception, also comprise a compensating resistance in the voltage (potential) measurer of the present invention and link to each other, in order to adjust the pointer magnitude of voltage of bleeder circuit with this multiplexer and this digital logical operation circuit.
According to above-mentioned conception, also comprise a resistor in the voltage (potential) measurer of the present invention between this power input and this digital logical operation circuit, in order to adjust bleeder circuit pointer magnitude of voltage.
As from the foregoing, voltage (potential) measurer of the present invention can highly be integrated in as in the acp chips such as north and south bridge chip group, reaches the needs of saving cost and meeting the system in future chip.
Description of drawings
Fig. 1 is the function block diagram that the voltage-level detector of a known built-in voltage stabilizing function is applied to a power supply unit and an operating circuit.
Fig. 2 is the function block diagram of a preferred embodiment of voltage (potential) measurer of the present invention.
Fig. 3 (a), Fig. 3 (b) are the practical circuit synoptic diagram of digital logical operation circuit in the voltage (potential) measurer of the present invention.
Fig. 3 (c), Fig. 3 (d) are and the truth table of door and the signalizing activity sequential synoptic diagram of the present invention and door.
Embodiment
Fig. 2 is that the present invention develops the preferred embodiment function block diagram about voltage (potential) measurer that, wherein power Vcc is the high-potential voltage that acp chip (a for example chipset) 2 outer power supply units 20 are exported, and this high-potential voltage that the bleeder circuits 21 (herein being a controlled variable resistance) in the acp chip 2 are exported this power supply unit carries out dividing potential drop and obtains a pointer voltage, and this pointer voltage is a little less than this high-potential voltage, for example, when the Vcc=2.5 volt, then pointer voltage can be made as 2.1 volts.And one of two input ends of digital logical operation circuit 22 link to each other with this input power Vcc, and the other end links to each other with a multiplexer 27; This pointer voltage that the minimum input voltage value VIH of this digital logical operation circuit 22 noble potential of regarding as exports a little less than this bleeder circuit, for example, VIH can be made as 2.0 volts.Thus, this high-potential voltage Vcc that exports when this power supply unit produces fluctuation, just very easily relatedly this pointer magnitude of voltage is changed downwards and be lower than VIH, this moment, this digital logical operation circuit just can send a caution signal, and this caution signal is exported after sampling and holding circuit 23 are kept its voltage potential.Can regularly send a clear signal to this sampling and holding circuit 23 and remove circuit 24 automatically, and then will take a sample and the output of holding circuit 23 is removed.Upwards count as for the triggering of this caution signal of 25 responses of ripple counter, and then learn the abnormal frequency of voltage.In addition, multiplexer 27 is electrically connected between this pointer voltage input end of this pointer voltage output end, a reference voltage Vref and this digital logical operation circuit 22 of this bleeder circuit 21, and it is controlled and select this reference voltage or pointer voltage are connected to this digital logical operation circuit 22.Store the numerical data of representing this pointer magnitude of voltage as for dividing potential drop mask register 28, can provide the connection status of setting this bleeder circuit 21, to adjust this pointer magnitude of voltage.
When multiplexer 27 is selected logical circuit 22 linked to each other with Vref, Va=Vcc, Vb=Vref, bleeder circuit 21 does not influence the input voltage of logical circuit 22 at this moment.When multiplexer 27 is selected logical circuit 22 linked to each other with bleeder circuit 21, Va=Vcc and remaining unchanged, but the pointer voltage influence that Vb then can be subjected to bleeder circuit 21 to be provided and changing.For instance, when the R3 of bleeder circuit 21 links to each other with R4n, when the effect that compensating resistance 26 (R5) is existed is taken into account in the lump again, Vb=Vcc*R '/(R3+R '), R '=R4n||R5 wherein, n=1,2,3 or 4; For example when n=1, Vb=Vcc*R '/(R3+R '), wherein R '=R41||R5.Though be that connection with R3 and R4n (n=1,2,3 or 4) constitutes bleeder circuit 21 in this example, divide piezoelectricity circuit 21 also can otherwise reach the effect of dividing potential drop.Again, though be provided with compensating resistance (R5) 26 in this example to adjust the effect of Vb, compensating resistance 26 also optionally is provided with or is not provided with, and when not being provided with Vb=Vcc*R4n/ (R3+R4n), n=1,2,3 or 4.
Fig. 3 (a) is depicted as a practical circuit synoptic diagram of digital logical operation circuit 22, it is finished with door 30 with one basically, and divider resistance R6 and R7 are divided into the output of pointer voltage with power Vcc, the received voltage of two input ends feasible and door 30 is respectively power Vcc and pointer voltage, with above-mentioned is example, power Vcc=Va and pointer voltage Vb are respectively 2.5 volts and 2.1 volts, Vb=Vcc*R7/ (R6+R7) wherein, and 30 minimum input voltage value VIH that regard as noble potential of this and door are 2.0 volts.When therefore producing the phenomenon of fluctuation downwards when the power Vcc instability, pointer voltage will very easily produce the phenomenon that is lower than VIH, add the effect of compensating resistance 26 (seeing shown in Figure 2), whether will make more convergence electronegative potential and convey door 30 output and be transformed into electronegative potential by original noble potential and send warning signal of pointer voltage, it is stable so can to detect voltage fast simply.As for Fig. 3 (b) be and two input ends of door 30 between set up the difference that a resistance R 8 reaches bias voltage, and then reduce misoperation and make output more stable.In this case:
Va＝Vcc*(R6+R7)/(R6+R7+R8)，Vb＝Vcc*R7/(R6+R7+R8)
Fig. 3 (c) is depicted as the truth table of the present invention and door 30, find out by wherein knowing, as two input end Va, when having a signal to be electronegative potential in the Vb received signal, its output end vo is just exported low-potential signal, and can know with the action synoptic diagram of door 30 by the present invention shown in Fig. 3 (d) again and find out, though the Vb received signal is a noble potential, but quite near VIH, therefore when the downward fluctuation of Va received signal is excessive, the Vb received signal is also fluctuateed downwards and be lower than VIH even VIL (regarding as the maximum input voltage value of electronegative potential), make output end vo then output low-potential signal with 30 at door.
In sum, whether downwards the present invention can provide the supply voltage information of fluctuation rapidly, and the bleeder circuit that controlled variable resistance is finished can be controlled by dividing potential drop mask register 28, and then the pointer magnitude of voltage of output is finely tuned.As for ripple counter 25 but unstable number of times is taken place in recording power, so that the hardware designer reference to be provided.In addition, the present invention adopts the design of pure digi-tal logical circuit, need not the big electric current circuit of the present invention of flowing through, therefore there are not power consumption and overheated possibility, and the design of pure digi-tal logic, under the situation that does not need particular process sequence or circuit layout, just can highly be integrated in as in the acp chips such as north and south bridge chip group, and then reach the saving cost and meet system in future chip (SystemOn Chip, demand SOC).
The present invention by the equivalent variations that the personage did of haveing the knack of this technology and all as modify the neither protection domain that takes off claim.
Claims (10)
1, a kind of voltage (potential) measurer works between a power supply unit and the functional circuit, and together is integrated in the integrated circuit (IC) chip with this functional circuit, it is characterized in that comprising:
One power input is electrically connected on this power supply unit, receives the high-potential voltage that this power supply unit is exported;
One bleeder circuit is electrically connected on this power supply unit, receives this high-potential voltage that this power supply unit exports and carries out dividing potential drop and obtain a pointer voltage, and this pointer voltage is lower than this high-potential voltage; And
One digital logical operation circuit, its two input end is electrically connected on this power input and this bleeder circuit respectively, the minimum input voltage value VIH of its noble potential of regarding as is lower than this pointer voltage that this bleeder circuit is exported, this high-potential voltage of exporting when this power supply unit produces fluctuation and relatedly this pointer magnitude of voltage is changed and when being lower than VIH, this digital logical operation circuit just sends a caution signal to this functional circuit downwards.
2, voltage (potential) measurer as claimed in claim 1, it is characterized in that described digital logical operation circuit be one with the door.
3, voltage (potential) measurer as claimed in claim 1 is characterized in that described bleeder circuit is a controlled variable resistance, to adjust this pointer magnitude of voltage of being exported.
4, voltage (potential) measurer as claimed in claim 1 is characterized in that also comprising:
One sampling and holding circuit is electrically connected on this digital logical operation circuit, exports after receiving this caution signal and keeping its voltage potential; And
One removes circuit automatically, is electrically connected on this sampling and holding circuit, regularly sends a clear signal to this sampling and holding circuit, and the sampling and the output of holding circuit are removed.
5, voltage (potential) measurer as claimed in claim 1 is characterized in that also comprising a ripple counter, is electrically connected on the output terminal of this digital logical operation circuit, responds the triggering of this caution signal and counting upwards.
6, voltage (potential) measurer as claimed in claim 1, it is characterized in that also comprising a multiplexer, be electrically connected between the input end of pointer voltage output end, a reference voltage end and this digital logical operation circuit of this bleeder circuit, can be controlled and select to export this reference voltage or pointer voltage to this digital logical operation circuit.
7, voltage (potential) measurer as claimed in claim 1, it is characterized in that also comprising a dividing potential drop mask register, be electrically connected on this bleeder circuit, store the numerical data of representing this pointer magnitude of voltage, so as to setting this pointer magnitude of voltage that this bleeder circuit is imported.
8, voltage (potential) measurer as claimed in claim 1 is characterized in that described functional circuit is a chipset.
9, voltage (potential) measurer as claimed in claim 6 is characterized in that also comprising a compensating resistance, is electrically connected between this multiplexer, this digital logical operation circuit and the earth point, in order to adjust this pointer magnitude of voltage of bleeder circuit.
10, voltage (potential) measurer as claimed in claim 1 is characterized in that also comprising a resistor between this power input and this digital logical operation circuit, in order to adjust this pointer magnitude of voltage of bleeder circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021056129A CN1172191C (en) | 2002-04-15 | 2002-04-15 | Voltage (potential) measurer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB021056129A CN1172191C (en) | 2002-04-15 | 2002-04-15 | Voltage (potential) measurer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1381732A CN1381732A (en) | 2002-11-27 |
| CN1172191C true CN1172191C (en) | 2004-10-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB021056129A Expired - Lifetime CN1172191C (en) | 2002-04-15 | 2002-04-15 | Voltage (potential) measurer |
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| Country | Link |
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| CN (1) | CN1172191C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462888C (en) * | 2005-07-21 | 2009-02-18 | 群联电子股份有限公司 | Detecting regulation circuit |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI268355B (en) | 2005-03-24 | 2006-12-11 | Via Tech Inc | Voltage monitor circuit management system with capable of reading the contents of the register through a bus |
| CN100360945C (en) * | 2005-04-20 | 2008-01-09 | 威盛电子股份有限公司 | Electric voltage observation circuit |
| CN100391090C (en) * | 2006-07-27 | 2008-05-28 | 华为技术有限公司 | Circuit for controlling power supply voltage output range |
| TWI312869B (en) * | 2006-09-01 | 2009-08-01 | Via Tech Inc | Power level detector |
| CN101853554B (en) * | 2010-04-29 | 2012-09-12 | 卢代高 | Fireproofing pre-warning monitoring method for unmanned base station and system thereof |
-
2002
- 2002-04-15 CN CNB021056129A patent/CN1172191C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100462888C (en) * | 2005-07-21 | 2009-02-18 | 群联电子股份有限公司 | Detecting regulation circuit |
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| Publication number | Publication date |
|---|---|
| CN1381732A (en) | 2002-11-27 |
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