CN203535416U - A digital signal processing chip power supply circuit - Google Patents

Abstract

The utility model relates to a power supply circuit, and more specifically relates to a digital signal processing chip power supply circuit. The digital signal processing chip power supply circuit comprises an input power supply, a voltage stabilizing circuit, a sequential control circuit, a first output power supply and a second output power supply. An input power supply firstly goes through a first voltage stabilization function portion of the voltage stabilizing circuit, then goes through the first output power supply to be output; and further under the effect of the sequential control circuit, a second voltage stabilization function portion begins to work, and the input power supply which has gone through the above procedure to be output by the first output power supply is output through the second output power supply. According to the utility model, the voltage stabilizing circuit and the sequential control circuit are employed to make the first output power supply to firstly output a 3.3V power supply, and the 3.3V power supply goes through the second output power supply under the effect of the sequential control circuit to be a power supply of 1.8v or 1.9V, so that sequential power up is realized.

Description

A kind of digital signal processing chip feed circuit

Technical field

The utility model relates to a kind of feed circuit, is specifically related to a kind of digital signal processing chip feed circuit.

Background technology

Current digital signal processing (DSP) chip has high performance CPU(clock and surpasses 100MHZ) and the advanced peripherals of high speed, but also increased the complicacy of DSP board design simultaneously, and compare with simple Design of Digital Circuit, face more heterogeneous like problem, be substantially the most also wherein most important be exactly that different processing kernel and input and output voltages needs power management techniques.

Dsp system generally has two kinds of voltages: core voltage (low-voltage mostly is 1.2V, 1.6V, 1.8V) and I/O voltage (high voltage mostly is 5V, 3.3V, 2.5V), both separate in power supply.Power supply powering order requires core voltage first to load than I/O voltage, at least will load simultaneously.If I/O voltage exists, core voltage does not exist, and can damage kernel.Power-off also should be followed such condition simultaneously.

The user manual of C2000 family chip has been recommended a kind of power-on method: the power supply (VDDIO that first starts all 3.3V power pins, VDD3VFL, VDDA1/VDDA2/VDDAIO/AVDDREFBG), then oblique ascension 1.8V(or 1.9V) (VDD/VDD1) power pins.Before VDDIO reaches 2.5V, 1.8V or 1.9V (VDD/VDD1) power supply can not reach 0.3V, this just can guarantee that the reset signal that derives from I/O pin blazes abroad by I/O impact damper, for the module in all devices provides power-on reset signal.

Summary of the invention

The purpose of this utility model is to provide a kind of single power supply, simple, effective feed circuit, meets the requirement of the power supply of C2000 family chip and electric sequence.

In order to realize above-mentioned target, the utility model adopts following technical scheme:

A kind of digital signal processing chip feed circuit, comprise input power, power indicating circuit, mu balanced circuit, sequential control circuit, the first out-put supply and the second out-put supply, when described input power is connected, described power indicating circuit is started working, circuit working state is indicated, input power is first exported by described the first out-put supply through the first voltage stabilizing function part of described mu balanced circuit, then after described sequential control circuit effect, the second voltage stabilizing function of described mu balanced circuit is partly started working, through the second out-put supply output.

Further comprise power indicating circuit, when described input power is connected, described power indicating circuit is started working, and circuit working state is indicated

Described input power is the single direct supply of 3.65V～10V, and described input power is received described mu balanced circuit input end after capacitor C 1, C2 filtering.

Described the first out-put supply is 3.3V power supply, and described the second out-put supply is 1.8V or 1.9V power supply.

Described 3.3V power supply connects follow-up feed circuit after capacitor C 6, C7 filtering, separates the 3.3VA analog power of supplying with digital signal processing chip simulation part independent power source by magnetic bead L1 simultaneously.

Described 1.8V power supply is directly exported, and described 1.9V power supply obtains after by resistance R 1, R2 dividing potential drop, and connects follow-up feed circuit after capacitor C 3, C4 filtering.

Described mu balanced circuit adopts integrated chip TPS767D3XX series.

Described mu balanced circuit adopts integrated chip TPS767D301 practical function, and wherein 1,2,7,8,13,14,15,16,19,20,21,26, No. 27 pin is " NC " pin, does not need to connect external circuit; No. 28 pins

without outside, connect; No. 4 pins

connect sequential control circuit; No. 22 pins

by button S1 ground connection; No. 3 pin GND, No. 10 pins

ground connection; No. 5 pin 1IN, No. 6 pin 1IN, No. 11 pin 2IN, No. 12 pin 2IN connect 5V power supply; No. 17 pin 2OUT, No. 18 pin 2OUT connect the first out-put supply and sequential control circuit simultaneously; No. 23 pin 1OUT, No. 24 pin 1OUT, No. 25 pin 1FB/NC connect the second out-put supply.

Described sequential control circuit consists of resistance R 4, R5, R6 and triode Q1, and wherein resistance R 4 one end are connected with 5V power supply, the other end simultaneously with No. 4 pins of integrated chip TPS767D301

, triode Q1 collector be connected; 5 one periods of whiles of resistance R are connected with 3.3V out-put supply with No. 17 pin 2OUT of integrated chip TPS767D301, No. 18 pin 2OUT; The other end is connected with the base stage of triode Q1, one end of resistance R 6 simultaneously; The other end of resistance R 6 is connected with ground with the emitter of triode Q1 simultaneously

Described power indicating circuit is for to consist of resistance R 3 and light emitting diode D1, resistance R 3 one termination 5V power supplys wherein, the positive pole of other end sending and receiving optical diode D1, the minus earth of light emitting diode D1.

Usefulness of the present utility model is: the utility model adopts mu balanced circuit and sequential control circuit to make the first out-put supply first export 3.3V power supply, then by the effect of sequential control circuit, through the second out-put supply, export 1.8V or 1.9V power supply, thereby meet the requirement of C2000 series digit signal processor electric sequence, realize sequence power-on.

Accompanying drawing explanation

Fig. 1 is the utility model circuit structure block diagram.

Fig. 2 is the utility model circuit topological structure.

Embodiment

Below in conjunction with the drawings and specific embodiments, the utility model is done to concrete introduction.

As depicted in figs. 1 and 2, digital signal processing chip feed circuit of the present utility model comprise input power, power indicating circuit, mu balanced circuit, sequential control circuit, the first out-put supply and the second out-put supply.Input power can be the single direct supply of 3.65V～10V, and input power is received mu balanced circuit input end after capacitor C 1, C2 filtering.The first out-put supply is 3.3V power supply, and the second out-put supply is 1.8V or 1.9V power supply.3.3V power supply connects follow-up feed circuit after capacitor C 6, C7 filtering, separates the 3.3VA analog power of supplying with digital signal processing chip simulation part independent power source by magnetic bead L1 simultaneously.1.8V power supply is directly exported.1.9V power supply obtains after by resistance R 1, R2 dividing potential drop, and connects follow-up feed circuit after capacitor C 3, C4 filtering.Mu balanced circuit adopts integrated chip TPS767D3XX series, preferred integrated chip TPS767D301, and wherein 1,2,7,8,13,14,15,16,19,20,21,26, No. 27 pin is " NC " pin, does not need to connect external circuit; No. 28 pins

without outside, connect; No. 4 pins

connect sequential control circuit; No. 22 pins

by button S1 ground connection; No. 3 pin GND, No. 10 pins

ground connection; No. 5 pin 1IN, No. 6 pin 1IN, No. 11 pin 2IN, No. 12 pin 2IN connect 5V power supply; No. 17 pin 2OUT, No. 18 pin 2OUT connect the first out-put supply and sequential control circuit simultaneously; No. 23 pin 1OUT, No. 24 pin 1OUT, No. 25 pin 1FB/NC connect the second out-put supply.Sequential control circuit consists of resistance R 4, R5, R6 and triode Q1, and wherein resistance R 4 one end are connected with 5V power supply, the other end simultaneously with No. 4 pins of integrated chip TPS767D301

, triode Q1 collector be connected; 5 one periods of whiles of resistance R are connected with 3.3V out-put supply with No. 17 pin 2OUT of integrated chip TPS767D301, No. 18 pin 2OUT; The other end is connected with the base stage of triode Q1, one end of resistance R 6 simultaneously; The other end of resistance R 6 is connected power indicating circuit for to consist of resistance R 3 and light emitting diode D1 with the emitter of triode Q1 with ground simultaneously, resistance R 3 one termination 5V power supplys wherein, the positive pole of other end sending and receiving optical diode D1, the minus earth of light emitting diode D1.

When 5V input power place in circuit, power indicating circuit is started working, and lumination of light emitting diode indication circuit enters normal operating conditions.5V input power is by No. 5 pin 1IN of integrated chip TPS767D301, No. 6 pin 1IN, No. 11 pin 2IN, No. 12 pin 2IN access integrated chip TPS767D301, make 3.3V power supply, 1.8V or the voltage stabilizing of 1.9V power supply partly enter ready state, due to No. 10 pins of 3.3V power supply voltage stabilizing part enable pin integrated chip TPS767D301

ground connection, can realize this part of functions, the 3.3VA power supply of normally being exported afterwards 3.3V power supply and being supplied with dsp chip simulation part by the filtering of electric capacity and the isolation of magnetic bead; And No. 4 pins of 1.9V power supply voltage stabilizing part enable pin integrated chip TPS767D301

with enable control section and be connected, be equivalent to be connected with 5V power supply, can not commence work without delay.After normal output 3.3V power supply, make the triode Q1 of sequential control circuit part in conducting state, make 1.8V or 1.9V power supply voltage stabilizing part enable pin ground connection, start working, 1.8V can directly export, and 1.9V can pass through resistance R 1, R2 and dividing potential drop computing formula $V_{\mathrm{OUT}}=V_{\mathrm{REF}}\×(1+\frac{R1}{R2})$ Obtain 1.9V power supply.

More than show and described ultimate principle of the present utility model, principal character and advantage.The technician of the industry should understand, and above-described embodiment does not limit the utility model in any form, and all employings are equal to replaces or technical scheme that the mode of equivalent transformation obtains, all drops in protection domain of the present utility model.

Claims (10)

1. digital signal processing chip feed circuit, it is characterized in that, comprise input power, mu balanced circuit, sequential control circuit, the first out-put supply and the second out-put supply, input power is first exported by described the first out-put supply through the first voltage stabilizing function part of described mu balanced circuit, then after described sequential control circuit effect, the second voltage stabilizing function of described mu balanced circuit is partly started working, through the second out-put supply output.

2. a kind of digital signal processing chip feed circuit according to claim 1, is characterized in that, further comprise power indicating circuit, and when described input power is connected, described power indicating circuit is started working, and circuit working state is indicated.

3. a kind of digital signal processing chip feed circuit according to claim 1, is characterized in that, the single direct supply that described input power is 3.65V～10V, and described input power is received described mu balanced circuit input end after capacitor C 1, C2 filtering.

4. a kind of digital signal processing chip feed circuit according to claim 1, is characterized in that, described the first out-put supply is 3.3V power supply, and described the second out-put supply is 1.8V or 1.9V power supply.

5. a kind of digital signal processing chip feed circuit according to claim 4, it is characterized in that, described 3.3V power supply connects follow-up feed circuit after capacitor C 6, C7 filtering, separates the 3.3VA analog power of supplying with digital signal processing chip simulation part independent power source by magnetic bead L1 simultaneously.

6. a kind of digital signal processing chip feed circuit according to claim 4, is characterized in that, described 1.8V power supply is directly exported, and described 1.9V power supply obtains after by resistance R 1, R2 dividing potential drop, and connects follow-up feed circuit after capacitor C 3, C4 filtering.

7. a kind of digital signal processing chip feed circuit according to claim 1, is characterized in that, described mu balanced circuit adopts integrated chip TPS767D3xx series.

8. a kind of digital signal processing chip feed circuit according to claim 7, it is characterized in that, described mu balanced circuit adopts integrated chip TPS767D301 practical function, wherein 1,2,7,8,13,14,15,16,19,20,21,26, No. 27 pin is " NC " pin, does not need to connect external circuit; No. 28 pins

without outside, connect; No. 4 pins

connect sequential control circuit; No. 22 pins by button S1 ground connection; No. 3 pin GND, No. 10 pins

ground connection; No. 5 pin 1IN, No. 6 pin 1IN, No. 11 pin 2IN, No. 12 pin 2IN connect 5V power supply; No. 17 pin 2OUT, No. 18 pin 2OUT connect the first out-put supply and sequential control circuit simultaneously; No. 23 pin 1OUT, No. 24 pin 1OUT, No. 25 pin 1FB/NC connect the second out-put supply.

9. a kind of digital signal processing chip feed circuit according to claim 8, it is characterized in that, described sequential control circuit consists of resistance R 4, R5, R6 and triode Q1, and wherein resistance R 4 one end are connected with 5V power supply, the other end simultaneously with No. 4 pins of integrated chip TPS767D301

, triode Q1 collector be connected; 5 one periods of whiles of resistance R are connected with 3.3V out-put supply with No. 17 pin 2OUT of integrated chip TPS767D301, No. 18 pin 2OUT; The other end is connected with the base stage of triode Q1, one end of resistance R 6 simultaneously; The other end of resistance R 6 is connected with ground with the emitter of triode Q1 simultaneously

10. a kind of digital signal processing chip feed circuit according to claim 1, it is characterized in that, described power indicating circuit is for to consist of resistance R 3 and light emitting diode D1, resistance R 3 one termination 5V power supplys wherein, the positive pole of other end sending and receiving optical diode D1, the minus earth of light emitting diode D1.

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