CN101349937A - Digital signal processor (DSP) power supply circuit - Google Patents
Digital signal processor (DSP) power supply circuit Download PDFInfo
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- CN101349937A CN101349937A CNA2008101264302A CN200810126430A CN101349937A CN 101349937 A CN101349937 A CN 101349937A CN A2008101264302 A CNA2008101264302 A CN A2008101264302A CN 200810126430 A CN200810126430 A CN 200810126430A CN 101349937 A CN101349937 A CN 101349937A
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Abstract
The invention provides a special digit signal processor (DPS) power supply circuit topology structure for TMS320F280X series of Texas Instrument (TI), wherein the TMS320F280x DPS needs two power supplies of +3.3V and +1.8V, and for confirming the normal and sequential application of the DPS after being powered, the application document of TI marks that: the power supply of +1.8V should be connected before the power supply of +3.3V when in power up. The circuit topology structure has simple structure and effectively satisfies the demands on the power supplies.
Description
Technical field
The present invention relates to be suitable for the Circuits System that powers on of the digital signal processor (DSP) of company of Texas Instrument (Texas Instrument) (hereinafter to be referred as TI company) TMS320F280X series.
Background technology
Digital signal processor (Digital Signal Processing, DSP) since being born the eighties in 20th century, be able to develop rapidly in short twenties years, it is used and has been deep into communication, Aero-Space, radar, Industry Control, network and household electrical appliances every field.American TI Company is maximum in the world DSP supplier, and its product accounts for more than 44% of world market.The TMS320 series that TI company releases is the most influential in the world at present main flow DSP product.
TMS320C280X is 32 fixed-point DSP chip of the up-to-date release of TI company.In order to advocate green energy conservation consumption reduction, TMS320C280X dsp chip designers have dropped to 1.8V with the core voltage of 280X inside, with the sheet peripheral devices required+3.3V distinguished and come.
Thus, the work of the TMS320F280X series DSP of TI company the time just need+3.3V and+1.8V two-way power supply.The user manual of 280X family chip requires: reliably working when guaranteeing the 280X chip power, and core voltage will be set up prior to peripheral hardware voltage in the sheet, and requirements+1.8V power supply is prior to+3.3V power supply foundation when promptly powering on.
Summary of the invention
The invention provides a kind of brief introduction, effective circuit topological structure, satisfy this power supply foundation order specially.Generation+1.8V and+two groups of power supplys of 3.3V, and make+1.8V sets up prior to+3.3V.Satisfy the requirement of TMS320C280X dsp chip power supply.
A kind of digital signal processor feed circuit, comprise first power circuit and second source circuit, wherein first power circuit and second source circuit provide two-way different operating supply voltage for digital signal processor, it is characterized in that: when digital signal processor powers on, first power circuit at first is the digital signal processor power supply, after delay a period of time, the second source circuit is the digital signal processor power supply again by the delay circuit in the second source circuit.
First power circuit is+the 1.8V power circuit that the second source circuit is+the 3.3V power circuit.
Digital signal processor is a TMS320F280X series DSP chip.
Delay circuit is the circuit that resistance and electric capacity constitute.
The power supply of first power circuit and second source circuit is generated by the power supply of same+5V.
In first power circuit, input+5V power supply is linked 3 pin of 1117-1.8V voltage stabilizer, i.e. VCC input pin; + 1.8V power circuit is linked 2 pin of 1117-1.8V voltage stabilizer, i.e. OUT output pin, and 1 pin ground connection of 1117-1.8V voltage stabilizer, EA1, CA1 are the flat ripple and the decoupling capacitors of input+5V power supply, EA2, CA2 are the flat ripple and the decoupling capacitors of output+1.8V power circuit.
In the second source circuit ,+3.3V power supply cooperates an enough power and withstand voltage triode to generate from+5V step-down by 431 stabilivolts.Wherein+5V links the C pin (collector) of Q1 triode and the end of R1, + 3.3V links the E pin (emitter) of Q1 triode, the B pin (base stage) of Q1 triode and the K pin of 431 stabilivolts link to each other, the A pin of 431 stabilivolts connects power supply ground, the end of the other end of R1 and R2, the end of C1 link to each other, the other end of R2 connects the B pin of Q1 triode, and the other end of C1 connects power supply ground.
Description of drawings
Fig. 1 represents+1.8V power circuit topological structure.
Fig. 2 represents+3.3V power circuit topological structure.
Fig. 3 represents+1.8V and+the 3.3V power supply sets up oscillogram successively.
Embodiment
Below, explain embodiments of the present invention in conjunction with the accompanying drawings.
Among the present invention+1.8V and+the 3.3V power supply generates by same road+5V power supply, Fig. 1 is+1.8V power circuit topological structure;
Among the figure+1.8V generates with the three terminal regulator of a 1117-1.8V.Wherein+5V links 3 pin (VCC input pin) of 1117-1.8V voltage stabilizer, + 1.8V links 2 pin (OUT output pin) of 1117-1.8V voltage stabilizer, 1117-1.8V 1 pin ground connection of voltage stabilizer, wherein EA1, CA1 are the flat ripple and the decoupling capacitors of input+5V power supply, and EA2, CA2 are the flat ripple and the decoupling capacitors of output+1.8V power supply.
Three terminal regulator is a kind ofly to convert high voltage to required low voltage, and the voltage stabilizer of certain load capacity is arranged, and is simple in structure, has only input, output, with reference to three pins in ground.This input voltage range maximum of 1117 can arrive+20V, and fan-out capability has 800mA～1A, can satisfy TMS320C280X DSP nuclear-electric power supply need of work fully.
1117-1.8V three terminal regulator power supply Time Created is uncontrollable basically, depends primarily on+time that 5V power supply itself is set up.
Fig. 2 ,+3.3V power supply cooperates an enough power and withstand voltage triode to generate from+5V step-down by 431 stabilivolts.Wherein+5V links the C pin (collector) of Q1 triode and the end of R1, + 3.3V links the E pin (emitter) of Q1 triode, the B pin (base stage) of Q1 triode and the K pin of 431 stabilivolts link to each other, the A pin of 431 stabilivolts connects power supply ground, the end of the other end of R1 and R2, the end of C1 link to each other, the other end of R2 connects the B pin of Q1 triode, and the other end of C1 connects power supply ground.
The 431 controlled parallel voltage-stabilizing diodes of three ends by name, it can generate needed+3.3V power supply with triode and the cooperation of all the other electronic components.Voltage reference+2.5V of R pin output of 431, the value that changes R3 and R4 can be adjusted the magnitude of voltage of output.E1, C2 are the flat ripple and the decoupling capacitors of input+5V power supply, and E2, C4 are the flat ripple and the decoupling capacitors of output+3.3V power supply.
431 output voltage controlled range maximum can arrive+36V.
431 common application circuits do not have C1 electric capacity.But because the specific (special) requirements of TMS320C280X dsp chip has increased C1 electric capacity especially.The difference of the present invention that Here it is and circuit common.
Circuit topology as shown in Figure 2, R1 and C1 form delay circuit, and the parameter value of coupling R1, two devices of C1 just can reach the control+3.3V power supply purpose of Time Created.The product of R1 and C1 is big more, and the time of time-delay is just long more, and the time that+3.3V sets up is just slow more.
Lift an example, get R1=330 Ω, C1=1uF, actual measurement+1.8V and+the 3.3V power supply sets up successively waveform as shown in Figure 3, as can be seen from Figure 3 ,+1.8V power supply is 0.8ms from 0V to complete Time Created; + 3.3V power supply is 3ms from 0V to complete Time Created, than+the whole late 2.2ms that set up of 1.8V power supply.Just can obtain first foundation+1.8V thus, again the effect of foundation+3.3V.
The present invention combines two circuit topologies of Fig. 1, Fig. 2, finally satisfied the 280X of TI company family chip when powering on+requirement that the 1.8V core voltage will be set up prior to peripheral hardware voltage in the+3.3V sheet.
The present invention is not limited to above-mentioned form of implementation, can be out of shape on the basis of principle of the present invention, and these distortion still belong to scope of the present invention.
Claims (7)
1. digital signal processor feed circuit, comprise first power circuit and second source circuit, wherein first power circuit and second source circuit provide two-way different operating supply voltage for digital signal processor, it is characterized in that: when digital signal processor powers on, first power circuit at first is the digital signal processor power supply, after delay a period of time, the second source circuit is the digital signal processor power supply again by the delay circuit in the second source circuit.
2. feed circuit according to claim 1 is characterized in that, first power circuit is+the 1.8V power circuit that the second source circuit is+the 3.3V power circuit.
3. feed circuit according to claim 2 is characterized in that, digital signal processor is a TMS320F280X series DSP chip.
4. feed circuit according to claim 1 and 2 is characterized in that, delay circuit is the circuit that resistance and electric capacity constitute.
5. according to claim 1 or 2 or 3 described feed circuit, it is characterized in that: the power supply of first power circuit and second source circuit is generated by the power supply of same+5V.
6. according to claim 2 or 3 described feed circuit, it is characterized in that: in first power circuit, input+5V power supply is linked 3 pin of 1117-1.8V voltage stabilizer, i.e. VCC input pin; + 1.8V power circuit is linked 2 pin of 1117-1.8V voltage stabilizer, i.e. OUT output pin, and 1 pin ground connection of 1117-1.8V voltage stabilizer, EA1, CA1 are the flat ripple and the decoupling capacitors of input+5V power supply, EA2, CA2 are the flat ripple and the decoupling capacitors of output+1.8V power circuit.
7. according to claim 2 or 3 described feed circuit, it is characterized in that: in the second source circuit ,+3.3V power supply cooperates an enough power and withstand voltage triode to generate from+5V step-down by 431 stabilivolts.Wherein+5V links the C pin (collector) of Q1 triode and the end of R1, + 3.3V links the E pin (emitter) of Q1 triode, the B pin (base stage) of Q1 triode and the K pin of 431 stabilivolts link to each other, the A pin of 431 stabilivolts connects power supply ground, the end of the other end of R1 and R2, the end of C1 link to each other, the other end of R2 connects the B pin of Q1 triode, and the other end of C1 connects power supply ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101264302A CN101349937A (en) | 2008-06-26 | 2008-06-26 | Digital signal processor (DSP) power supply circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2008101264302A CN101349937A (en) | 2008-06-26 | 2008-06-26 | Digital signal processor (DSP) power supply circuit |
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| CN101349937A true CN101349937A (en) | 2009-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNA2008101264302A Pending CN101349937A (en) | 2008-06-26 | 2008-06-26 | Digital signal processor (DSP) power supply circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074417A (en) * | 2011-01-25 | 2011-05-25 | 浙江申乐电气有限公司 | Digital timer |
| CN102081367A (en) * | 2011-01-25 | 2011-06-01 | 浙江申乐电气有限公司 | Simple timer |
| CN102386900A (en) * | 2011-01-25 | 2012-03-21 | 浙江申乐电气有限公司 | Multi-potential digital timer |
-
2008
- 2008-06-26 CN CNA2008101264302A patent/CN101349937A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102074417A (en) * | 2011-01-25 | 2011-05-25 | 浙江申乐电气有限公司 | Digital timer |
| CN102081367A (en) * | 2011-01-25 | 2011-06-01 | 浙江申乐电气有限公司 | Simple timer |
| CN102386900A (en) * | 2011-01-25 | 2012-03-21 | 浙江申乐电气有限公司 | Multi-potential digital timer |
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Open date: 20090121 |