CN208270993U - Electrifying startup circuit for Loongson processor - Google Patents
Electrifying startup circuit for Loongson processor Download PDFInfo
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- CN208270993U CN208270993U CN201820879354.1U CN201820879354U CN208270993U CN 208270993 U CN208270993 U CN 208270993U CN 201820879354 U CN201820879354 U CN 201820879354U CN 208270993 U CN208270993 U CN 208270993U
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Abstract
The utility model discloses a kind of electrifying startup circuits for Loongson processor, comprising: power-switching circuit, for the supply voltage of external power supply to be converted to scheduled first voltage；Electrifying timing sequence circuit, the input terminal of electrifying timing sequence circuit is electrically connected with the output end of power-switching circuit, tertiary voltage for first voltage to be respectively converted into the second voltage that the kernel of Loongson processor can be made to work normally He the I/O interface of Loongson processor can be made to work normally, and make second voltage and tertiary voltage that there is the sequential relationship successively successively exported outward；Holding circuit is resetted, the tertiary voltage that holding circuit is used to receive electrifying timing sequence circuit output is resetted, to generate the reset signal that Loongson processor can be made to reset, and reset signal is made to keep 100ms or more.The utility model can satisfy the electrifying startup requirement of Loongson processor.
Description
Technical field
The utility model relates to a kind of electrifying startup circuits of microprocessor.
Background technique
As the domestic CPU of mainstream, currently, Loongson processor has obtained more and more extensive answer in various industries
With.Since the research and development starting of homemade chip is slower, product maturity is not so good as chip inlet, therefore is using Loongson processor
On cpu chip, need to do some special designs according to the requirement of Loongson processor.Wherein in Loongson processor electrifying startup rank
Section, it is necessary to meet CPU core and be powered on first, be just powered on to peripheral circuit after determining the I/O Interface status of CPU, and need
There is the reset delay (not less than 100ms) of certain time to cpu chip, just can guarantee that cpu chip can work normally.
Summary of the invention
The technical problem to be solved by the utility model is to provide a kind of electrifying startups that can satisfy Loongson processor
It is required that electrifying startup circuit.
The utility model embodiment provides a kind of powering on for Loongson processor according to an embodiment of the present invention
Start-up circuit, comprising: power-switching circuit, for the supply voltage of external power supply to be converted to scheduled first voltage；It powers on
Sequence circuit, the input terminal of electrifying timing sequence circuit are electrically connected with the output end of power-switching circuit, for distinguishing first voltage
It is converted to the second voltage that the kernel of Loongson processor can be made to work normally and the I/O interface of Loongson processor can be made normal
The tertiary voltage of work, and make second voltage and tertiary voltage that there is the sequential relationship successively successively exported outward；It resets and keeps
Circuit, resets the tertiary voltage that holding circuit is used to receive electrifying timing sequence circuit output, Loongson processor can be made to answer to generate
The reset signal of position, and reset signal is made to keep 100ms or more.
The utility model is at least up to one of beneficial effect below:
The electrifying startup circuit of the utility model embodiment passes through setting power-switching circuit, electrifying timing sequence circuit and reset
Holding circuit meets the electrifying startup requirement of Loongson processor, and circuit overall structure is simple, at low cost.
Detailed description of the invention
It, below will be to required in embodiment description in order to illustrate more clearly of the technical scheme in the embodiment of the utility model
Attached drawing to be used is briefly introduced, it should be apparent that, the accompanying drawings in the following description is only some implementations of the utility model
Example, for those of ordinary skill in the art, without any creative labor, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 shows the principle frame of the electrifying startup circuit for Loongson processor according to an embodiment of the present invention
Figure.
Fig. 2 shows according to the input protection circuit of an embodiment of the present invention and the circuit diagram of power-switching circuit.
Fig. 3 shows the circuit diagram of the electrifying timing sequence circuit according to an embodiment of the present invention.
Fig. 4 shows the waveform diagram of the electrifying timing sequence according to an embodiment of the present invention.
Fig. 5 shows the circuit diagram of the reset holding circuit according to an embodiment of the present invention.
Specific embodiment
Further explanation is made to the utility model with reference to the accompanying drawing.
Please refer to Fig. 1.It include defeated according to the electrifying startup circuit for Loongson processor of an embodiment of the present invention
Enter to protect circuit 1, power-switching circuit 2, electrifying timing sequence circuit 3 and reset protective circuit 4.
The output end of input protection circuit 1 is connect with the input terminal of power-switching circuit 2, and input protection circuit 1 is for working as
Providing protection against when the case where over-voltage, overcurrent or reversed polarity occurs in input signal.Power-switching circuit 2 is used for external power supply
Supply voltage be converted to scheduled first voltage.
Incorporated by reference to shown in Fig. 2.In the present embodiment, the supply voltage of external power supply is 24V.Scheduled first voltage is
5V.Input protection circuit includes self-recovery fuse F1, rectifier bridge D1, varistor R0, filter capacitor C1 and TVS pipe D2.From
The one end for restoring fuse F1 is used to connect with the anode of external power supply, and the other end of self-recovery fuse F1 is with rectifier bridge D1's
Electrode input end connection.The negative input of rectifier bridge D1 with the cathode of external power supply for connecting.The both ends of varistor R1
It is connect respectively with the electrode input end of rectifier bridge D1 and negative input.The both ends of filter capacitor C1 respectively with rectifier bridge D1 just
Pole output end is connected with cathode output end.TVS pipe D2 is connected in parallel with filter capacitor C1, the cathode and rectifier bridge D1 of TVS pipe D2
Cathode output end connection, TVS pipe D2 anode connect with the cathode output end of rectifier bridge D1.
The effect of rectifier bridge D1 is to guarantee that circuit also can work normally really when the positive and negative anodes of external power supply are reversed.
When overcurrent condition occurs, self-recovery fuse F1 be will disconnect, so that the circuit of rear end is protected, when electric current restores normal, from
It is resilient to restore fuse F1.When overpressure situation occurs, the resistance value of varistor R0 can become very small, and electric current increases, and lead
It causes self-recovery fuse F1 to disconnect, effectively prevents over-voltage damage caused by module.TVS pipe D2 can then filter out power supply electrifying
The spike that moment generates.
The input terminal of power-switching circuit 2 is connect with the cathode of TVS pipe D2 and anode respectively.Power-switching circuit 2 is by 24V
Voltage is converted for 5V voltage.Power-switching circuit 2 is mainly made of power conversion chip U1, the type of power conversion chip U1
Number be ZUS2405.
The input terminal of electrifying timing sequence circuit 3 is electrically connected with the output end of power-switching circuit 2, for distinguishing first voltage
It is converted to the second voltage that the kernel of Loongson processor 5 can be made to work normally and the I/O interface of Loongson processor 5 can be made just
The tertiary voltage often to work, and make second voltage and tertiary voltage that there is the sequential relationship successively successively exported outward.
Please refer to Fig. 3.In the present embodiment, electrifying timing sequence circuit 3 includes that the first decompression adjustment sub-circuit 31, second is depressured
Adjust sub-circuit 32 and timing control sub-circuit 33.
The power input of first decompression adjustment sub-circuit 31 is connect with the output end of power-switching circuit 2, is used for the
One voltage is depressured, and the first voltage that size is 5V is converted to that the kernel of Loongson processor 5 can be made to work normally
Two voltages simultaneously export.The second voltage is 1.2V, which is exported to Loongson processor 5.First decompression adjustment son electricity
Road 31 is mainly made of decompression adjustment chip U2, model ADP1706-1.2.
The input terminal of timing control sub-circuit 33 is connect with the output end of the first decompression adjustment sub-circuit 31, timing control
The output end of circuit 33 is connect with the enable end of the second decompression adjustment sub-circuit 32；Timing control sub-circuit 33 is for receiving
Enable signal is exported to the second decompression adjustment sub-circuit when second voltage.Specifically, timing control sub-circuit 33 includes first
Current-limiting resistance R3, the second current-limiting resistance R4, third current-limiting resistance R8, the first NPN triode Q1 and the second NPN triode Q2.
One end of first current-limiting resistance R3 is connect with voltage source, tri- pole of the other end and the first NPN of the first current-limiting resistance R3
The collector of pipe Q1 connects；The base stage of first NPN triode Q1 is connect with one end of third current-limiting resistance R8, third current-limiting resistance
The other end of R2 is connect with the output end of the first decompression adjustment sub-circuit 31, the emitter ground connection of the first NPN triode Q1.Second
One end of current-limiting resistance R4 is connect with voltage source, the collector of the other end of the second current-limiting resistance R4 and the second NPN triode Q2
Connection；The base stage of the second NPN triode Q2 current collection with the other end of the first current-limiting resistance R3 and the first NPN triode Q1 respectively
Pole connection, the emitter ground connection of the second NPN triode Q2.In the present embodiment, one end of the first current-limiting resistance R3 and the second limit
One end of leakage resistance R4 is connect with the output end of power-switching circuit respectively, i.e., the size of voltage source is 5V.
The input terminal of second decompression adjustment sub-circuit 32 is connect with the output end of power-switching circuit 2, is turned with receiving power supply
The size for changing circuit output is the first voltage of 5V.Second decompression adjustment sub-circuit 32 is used for when receiving enable signal, right
First voltage is depressured, and first voltage is converted to the tertiary voltage that the I/O interface of Loongson processor 5 can be made to work normally
And export, which is 3.3V.Second decompression adjustment sub-circuit 32 is mainly made of decompression adjustment chip U3, model
TPS75833.The EN pin of decompression adjustment chip U3 is enable pin, and when the input voltage of enable pin is greater than 2V, decompression is adjusted
Whole chip U3 starts normal output voltage.When the base stage of the first NPN triode Q1 receive the first decompression adjustment sub-circuit 31 it is defeated
When 1.2V voltage out, the first NPN triode Q1 conducting, the second NPN triode Q2 is disconnected, the EN pin of decompression adjustment chip U3
It is connect with 5V voltage source, then EN pin obtains enable signal, and 5V voltage is converted to 3.3V voltage by decompression adjustment chip U3, should
3.3V voltage is exported to the I/O interface of Loongson processor 5.
Fig. 4 shows the upper electrical waveform of the second voltage and tertiary voltage observed when powering on by oscillograph, wherein R1
For the waveform of tertiary voltage, R2 is the waveform of second voltage.
The tertiary voltage that holding circuit 4 is used to receive the output of electrifying timing sequence circuit 3 is resetted, Godson can be made to handle to generate
The reset signal that device 5 resets, and reset signal is made to keep 100ms or more, so that providing Loongson processor 5 resets required answer
Position delay, can be used normally Loongson processor 5.
In the present embodiment, resetting holding circuit 4 includes reset chip U4 and pull-up resistor R6.The power supply of reset chip U4
One end of input terminal VCC, the RESET input MR of reset chip U4 and pull-up resistor R6 are electric with the second decompression adjustment respectively
The output end on road 32 connects, and the other end of pull-up resistor R6 is connect with the reset output terminal RESET of reset chip U4.Reset chip
The model IMP811S of U4.After reset chip U4 obtains the power supply of 3.3V, reset chip U4 can generate a reset signal,
The signal is able to maintain 120ms, meets the requirement that Loongson processor 5 needs 100ms or more resetting time.
Obviously, it is practical without departing from this can to carry out various modification and variations to the utility model by those skilled in the art
Novel spirit and scope.If in this way, these modifications and variations of the present invention belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to include these modifications and variations.
Claims (9)
1. a kind of electrifying startup circuit for Loongson processor characterized by comprising
Power-switching circuit, for the supply voltage of external power supply to be converted to scheduled first voltage；
The input terminal of electrifying timing sequence circuit, the electrifying timing sequence circuit is electrically connected with the output end of the power-switching circuit, is used
The second voltage that the kernel of Loongson processor can be made to work normally and dragon can be made in the first voltage to be respectively converted into
The tertiary voltage that the I/O interface of die processor works normally, and make the second voltage and tertiary voltage have successively successively to
The sequential relationship of outer output；
Reset holding circuit, the tertiary voltage for resetting holding circuit and being used to receive electrifying timing sequence circuit output, to generate energy
The reset signal for enough resetting Loongson processor, and the reset signal is made to keep 100ms or more.
2. being used for the electrifying startup circuit of Loongson processor as described in claim 1, which is characterized in that the electrifying timing sequence electricity
Road includes the first decompression adjustment sub-circuit, the second decompression adjustment sub-circuit and timing control sub-circuit；
The power input of the first decompression adjustment sub-circuit is connect with the output end of the power-switching circuit, for institute
It states first voltage to be depressured, the first voltage is converted to the second electricity that the kernel of Loongson processor can be made to work normally
It presses and exports；
The input terminal of the timing control sub-circuit is connect with the output end of the first decompression adjustment sub-circuit, the timing control
The output end of system circuit is connect with the enable end of the second decompression adjustment sub-circuit；The timing control sub-circuit is used for
Enable signal is exported to the second decompression adjustment sub-circuit when receiving the second voltage；
The input terminal of the second decompression adjustment sub-circuit is connect with the output end of the power-switching circuit, for receiving
When the enable signal, the first voltage is depressured, the first voltage, which is converted to, can make Loongson processor
I/O interface work normally tertiary voltage and output.
3. being used for the electrifying startup circuit of Loongson processor as claimed in claim 2, which is characterized in that timing control
Circuit includes the first current-limiting resistance, the second current-limiting resistance, third current-limiting resistance, the first NPN triode and the second NPN triode；
One end of first current-limiting resistance is connect with voltage source, the other end of the first current-limiting resistance and tri- pole the first NPN
The collector of pipe connects；The base stage of first NPN triode is connect with one end of the third current-limiting resistance, third current-limiting resistance
The other end is connect with the output end of the first decompression adjustment sub-circuit, the emitter ground connection of the first NPN triode；
One end of second current-limiting resistance is connect with the voltage source, the other end of the second current-limiting resistance and the 2nd NPN
The collector of triode connects；The base stage of second NPN triode respectively with the other end of the first current-limiting resistance and the first NPN
The collector of triode connects, the emitter ground connection of the second NPN triode.
4. being used for the electrifying startup circuit of Loongson processor as claimed in claim 3, which is characterized in that the first voltage is
5V；One end of first current-limiting resistance and the output with the power-switching circuit respectively of one end of second current-limiting resistance
End connection.
5. being used for the electrifying startup circuit of Loongson processor as claimed in claim 3, which is characterized in that the second voltage is
1.2V, the tertiary voltage are 3.3V.
6. being used for the electrifying startup circuit of Loongson processor as claimed in claim 5, which is characterized in that the reset keeps electricity
Road includes reset chip and pull-up resistor；
One end of the power input of the reset chip, the RESET input of the reset chip and the pull-up resistor point
It is not connect with the output end of the second decompression adjustment sub-circuit, the other end of the pull-up resistor is answered with the reset chip
Position output end connection.
7. the electrifying startup circuit for Loongson processor as described in any one of claim 1 to 6, which is characterized in that
The electrifying startup circuit for Loongson processor includes input protection circuit, the output end of the input protection circuit with
The input terminal of the power-switching circuit connects, and the input protection circuit is used to work as input signal and over-voltage, overcurrent or anti-occurs
It is provided protection against when the case where polarity.
8. being used for the electrifying startup circuit of Loongson processor as claimed in claim 7, which is characterized in that the input protection electricity
Road includes self-recovery fuse, rectifier bridge, varistor, filter capacitor and TVS pipe；One end of the self-recovery fuse is used for
It is connect with the anode of external power supply, the other end of self-recovery fuse is connect with the electrode input end of the rectifier bridge；It is described whole
The negative input of stream bridge with the cathode of the external power supply for connecting；The both ends of the varistor respectively with the rectification
The electrode input end of bridge is connected with negative input；The both ends of the filter capacitor cathode output end with the rectifier bridge respectively
It is connected with cathode output end, the TVS pipe is connected in parallel with the filter capacitor, and the cathode of TVS pipe and the rectifier bridge are just
The anode of the connection of pole output end, TVS pipe is connect with the cathode output end of the rectifier bridge；
The input terminal of the power-switching circuit is connect with the cathode of the TVS pipe and anode respectively.
9. being used for the electrifying startup circuit of Loongson processor as described in claim 1, which is characterized in that the external power supply
Supply voltage is 24V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820879354.1U CN208270993U (en) | 2018-06-07 | 2018-06-07 | Electrifying startup circuit for Loongson processor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820879354.1U CN208270993U (en) | 2018-06-07 | 2018-06-07 | Electrifying startup circuit for Loongson processor |
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| Publication Number | Publication Date |
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| CN208270993U true CN208270993U (en) | 2018-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820879354.1U Active CN208270993U (en) | 2018-06-07 | 2018-06-07 | Electrifying startup circuit for Loongson processor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221399A (en) * | 2019-12-06 | 2020-06-02 | 北京和利时智能技术有限公司 | Loongson CPU-based peripheral system circuit and system |
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2018
- 2018-06-07 CN CN201820879354.1U patent/CN208270993U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111221399A (en) * | 2019-12-06 | 2020-06-02 | 北京和利时智能技术有限公司 | Loongson CPU-based peripheral system circuit and system |
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Address after: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee after: The 711 Research Institute of China Shipbuilding Corp. Address before: 201108 Shanghai city Minhang District Huaning Road No. 3111 Patentee before: Shanghai Marine Diesel Engine Research Institute |