CN107391414B - A kind of signal input circuit and hot-pluggable optical module - Google Patents
A kind of signal input circuit and hot-pluggable optical module Download PDFInfo
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- CN107391414B CN107391414B CN201710608532.7A CN201710608532A CN107391414B CN 107391414 B CN107391414 B CN 107391414B CN 201710608532 A CN201710608532 A CN 201710608532A CN 107391414 B CN107391414 B CN 107391414B
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- chip microcontroller
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- signal input
- power supply
- module
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
- G06F13/38—Information transfer, e.g. on bus
- G06F13/40—Bus structure
- G06F13/4063—Device-to-bus coupling
- G06F13/4068—Electrical coupling
- G06F13/4081—Live connection to bus, e.g. hot-plugging
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/0185—Coupling arrangements; Interface arrangements using field effect transistors only
- H03K19/018507—Interface arrangements
Abstract
The present invention provides a kind of signal input circuit and hot-pluggable optical module, is related to electronic technology field, in the current potential for preventing overvoltage from avoiding dragging down single-chip microcomputer signal input pin while damaging single-chip microcontroller.The circuit includes: control module and clamper module；Control module connects the grounding pin and the first level terminal of power supply, single-chip microcontroller, for under the control for the operating voltage that power supply exports by the grounding pin of the voltage output of the first level terminal to single-chip microcontroller, the grounding pin floating of control single chip computer in power supply non-output services voltage；The power pins of the upper voltage end connection single-chip microcontroller of clamper module, the grounding pin of the next voltage end connection single-chip microcontroller of clamper module；The voltage for the input signal for inputting single-chip microcontroller to the signal input pin by single-chip microcontroller under the control of voltage for voltage and the next voltage end in upper voltage end carries out clamper.The present invention is used for the manufacture of hot-pluggable optical module.
Description
Technical field
The present invention relates to electronic technology field more particularly to a kind of signal input circuit and hot-pluggable optical modules.
Background technique
Hot plug (English name: hot-plugging or Hot Swap) plugs.Hot-swappable device allows to use
Family is taken out or is accessed in the case where not closing system, not cutting off the power, therefore the flexibility with higher of hot-swappable device,
It is with a wide range of applications.
Hot-pluggable optical module in the prior art has the slow electrification circuit for reducing the impact to system power supply, tool
Body, shown referring to Fig.1 to delay electrification circuit, when system power supply Tx_Power input voltage, the voltage of input is first to capacitor
13 charge, to make the voltage on 11 grid of transistor by being gradually decrease to zero greatly, transistor 11 is slowly connected, then again
Power supply is provided to hot-pluggable optical module by voltage output end VCC.Since slowly conducting can make Tx_Power to transistor 11
Input voltage postpones with the regular hour, therefore can reduce the impact to system power supply.In addition, referring to shown in Fig. 2, it can heat
After plugging the insertion of optical module 21, (the English name: Inter Integrated of IC bus 23 of system board 22
Circuit, referred to as: IIC；Include: SCL/SDA equisignal line) pass through the resistance (R1/R2) of 4.7K Ω to 10k Ω for 3.3V's
Voltage signal access hot-pluggable optical module 21 in, and as shown in figure 3, the single-chip microcontroller 31 in hot-pluggable optical module 21 each letter
Number input pin is additionally provided with clamp circuit (D1/D2), wherein to carry out for the signal input pin I for connecting SCL in Fig. 3
Explanation.The structure of above-mentioned hot-pluggable optical module has following defects that after the insertion of hot-pluggable optical module 21, delays electrification circuit
Transistor 11 be not yet connected before, the impedance between the internal circuit and ground of the single-chip microcontroller of hot-pluggable optical module is smaller, that is, clamps
Impedance between the cathode and ground of the upper diode D1 of position circuit is smaller, and the power pins VCC1 of single-chip microcontroller can pass through single-chip microcontroller
The other circuits being connected between VCC1 and GND1 inside internal circuit and optical module discharge over the ground, to drag down signal input
The current potential of pin I, drag down system board IIC current potential, other devices connecting at this time with the IIC of system board just will mistakenly believe that can
Plug optical module will occupy the IIC of system board, thus make system board IIC can not normal use, and if by each letter of single-chip microcontroller
Clamp circuit removal on number input pin, then the voltage for inputting single-chip microcontroller will be unrestricted, it is thus possible to will lead to overvoltage
Damage single-chip microcontroller.
Summary of the invention
The embodiment of the present invention provides a kind of signal input circuit and hot-pluggable optical module, for preventing overvoltage from damaging
Avoid dragging down the current potential of single-chip microcomputer signal input pin while bad single-chip microcontroller.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, providing a kind of signal input circuit, the voltage for the signal input pin to single-chip microcontroller is controlled
System, the signal input circuit includes: control module and clamper module；
The control module connection provides power supply, the list of operating voltage to the single-chip microcontroller by the power pins of single-chip microcontroller
The grounding pin of piece machine and the first level terminal, for electric by described first under the control for the operating voltage that the power supply exports
The voltage output of flush end controls the single-chip microcontroller in the non-output services voltage of the power supply to the grounding pin of the single-chip microcontroller
Grounding pin floating；
The upper voltage end of the clamper module connects the power pins of the single-chip microcontroller, the bottom electricity of the clamper module
The grounding pin of single-chip microcontroller described in press bond；The clamper module is also connected with the signal input pin of the single-chip microcontroller, is used for
The signal input by the single-chip microcontroller is drawn under the control of the voltage of the voltage and the next voltage end of the upper voltage end
The voltage that foot inputs the input signal of the single-chip microcontroller carries out clamper.
Second aspect provides a kind of hot-pluggable optical module, comprising: above-mentioned signal input circuit.
Signal input circuit provided in an embodiment of the present invention includes: control module and clamper module；Wherein, control module can
With under the control for the operating voltage that power supply exports by the grounding pin of the voltage output of the first level terminal to single-chip microcontroller, in power supply
The grounding pin floating of control single chip computer when non-output services voltage；Clamper module can voltage in upper voltage end and bottom
The voltage for passing through the input signal of the signal input pin input single-chip microcontroller of single-chip microcontroller under the control of the voltage of voltage end is clamped
Position；Therefore the control module of signal input circuit provided in an embodiment of the present invention can be controlled in the non-output services voltage of power supply
The grounding pin floating of single-chip microcontroller, and then the signal input pin of single-chip microcontroller is avoided to pass sequentially through the electricity of clamper module, single-chip microcontroller
The grounding pin of source pin, single-chip microcontroller internal circuit and single-chip microcontroller discharges to the first level terminal, and the signal for dragging down single-chip microcontroller is defeated
Enter the current potential of pin；In addition, control module can also in power supply output services voltage by the voltage output of the first level terminal extremely
The grounding pin of single-chip microcontroller allows clamper module under the control of the voltage of power pins and the voltage of grounding pin to passing through
The voltage of the input signal of the signal input pin input single-chip microcontroller of single-chip microcontroller carries out clamper, to prevent overvoltage from damaging monolithic
Machine, the i.e. embodiment of the present invention can prevent overvoltage from avoiding dragging down single-chip microcomputer signal input pin while damaging single-chip microcontroller
Current potential.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the circuit diagram of the slow electrification circuit of hot-pluggable optical module in the prior art；
Fig. 2 is the schematic diagram of the IIC of system board in the prior art；
Fig. 3 is the circuit diagram of the clamp circuit of hot-pluggable optical module in the prior art；
Fig. 4 is one of the schematic diagram of signal input circuit provided in an embodiment of the present invention；
Fig. 5 is the two of the schematic diagram of signal input circuit provided in an embodiment of the present invention；
Fig. 6 is one of the circuit diagram of signal input circuit provided in an embodiment of the present invention；
Fig. 7 is the two of the circuit diagram of signal input circuit provided in an embodiment of the present invention；
Fig. 8 is the three of the circuit diagram of signal input circuit provided in an embodiment of the present invention；
Fig. 9 is the four of the circuit diagram of signal input circuit provided in an embodiment of the present invention；
Figure 10 is the circuit diagram of hot-pluggable optical module provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
The transistor used in all embodiments of the invention can be thin film transistor (TFT) or field-effect tube or other characteristic phases
Same device is on-off action according to transistor main function used by effect the embodiment of the present invention in circuit.By
It is symmetrical in the source electrode of the transistor used here, drain electrode, so its source electrode, drain electrode can be interchanged.Of the invention real
It applies in example, to distinguish the two poles of the earth of transistor in addition to grid, wherein will be known as the first pole by source electrode, drain electrode is known as the second pole.By attached
Form in figure provides that the intermediate ends of transistor are grid, signal input part is source electrode, signal output end is drain electrode.Furthermore this hair
Transistor used by bright embodiment can be P-type transistor or N-type transistor, wherein P-type transistor is low level in grid
When be connected, grid be high level when end, N-type switching transistor be the conducting when grid is high level, grid be low electricity
Usually end.
Although should be noted the embodiment of the present invention employed in triode equally include three pins, three
The title of a pin is respectively collector, emitter and base stage, provides that the pin among triode is base by the form in attached drawing
Pole, the pin of two sides are respectively collector and emitter.It is in place of triode and the maximum difference of above-mentioned transistor, transistor
Source electrode, drain electrode be it is symmetrical, electric current can be flowed to from source electrode and be drained, or flow to source electrode from drain electrode and triode then begins
It is one-way conduction eventually, i.e., the electric current in triode can only flow to emitter from collector, or can only flow to and collect from emitter
Electrode.Specifically, PNP type triode, electric current can only flow to collector from emitter, and PNP type triode, electric current can only be from current collection
Pole flows to emitter.In addition, the working condition for being different from above-mentioned transistor includes on and off state, in the embodiment of the present invention
The working condition of used triode includes: cut-off, amplification and saturation state.
In addition, in an embodiment of the present invention, being used for the ease of clearly describing the technical solution of the embodiment of the present invention
The printed words such as " first ", " second " distinguish function and the essentially identical identical entry of effect or similar item, those skilled in the art
Member is understood that the printed words such as " first ", " second " are not to be defined to quantity and execution order.
Based on above content, the embodiment of the present invention provides a kind of signal input circuit, the signal input circuit for pair
The voltage of the signal input pin of single-chip microcontroller is controlled.Specifically, referring to shown in Fig. 4, signal provided in an embodiment of the present invention
Input circuit includes: control module 41 and clamper module 42.
The connection of control module 41 provides the power supply of operating voltage to single-chip microcontroller 40 by the power pins VCC1 of single-chip microcontroller 40
VCC, the grounding pin GND1 of single-chip microcontroller 40 and the first level terminal V1, the control of the operating voltage for being exported in power supply VCC
The lower voltage output by the first level terminal V1 to single-chip microcontroller 40 grounding pin GND1, in the non-output services voltage of power supply VCC
The grounding pin GND1 floating of control single chip computer 40.
The power pins VCC1 of the upper voltage end VS connection single-chip microcontroller 40 of clamper module 42, the bottom electricity of clamper module 42
The grounding pin GND1 of pressure side VX connection single-chip microcontroller 40；Clamper module 42 is also connected with the signal input pin Input of single-chip microcontroller 40,
It is inputted under the control of voltage for voltage and the next voltage end VX in upper voltage end VS to by the signal of single-chip microcontroller 40
The voltage that pin Input inputs the input signal of the single-chip microcontroller carries out clamper.
Signal input circuit provided in an embodiment of the present invention includes: control module and clamper module；Wherein, control module can
With under the control for the operating voltage that power supply exports by the grounding pin of the voltage output of the first level terminal to single-chip microcontroller, in power supply
The grounding pin floating of control single chip computer when non-output services voltage；Clamper module can voltage in upper voltage end and bottom
The voltage for passing through the input signal of the signal input pin input single-chip microcontroller of single-chip microcontroller under the control of the voltage of voltage end is clamped
Position；Therefore the control module of signal input circuit provided in an embodiment of the present invention can be controlled in the non-output services voltage of power supply
The grounding pin floating of single-chip microcontroller, and then the signal input pin of single-chip microcontroller is avoided to pass sequentially through the electricity of clamper module, single-chip microcontroller
The grounding pin of source pin, single-chip microcontroller internal circuit and single-chip microcontroller discharges to the first level terminal, and the signal for dragging down single-chip microcontroller is defeated
Enter the current potential of pin；In addition, control module can also in power supply output services voltage by the voltage output of the first level terminal extremely
The grounding pin of single-chip microcontroller allows clamper module under the control of the voltage of power pins and the voltage of grounding pin to passing through
The voltage of the input signal of the signal input pin input single-chip microcontroller of single-chip microcontroller carries out clamper, to prevent overvoltage from damaging monolithic
Machine, the i.e. embodiment of the present invention can prevent overvoltage from avoiding dragging down single-chip microcomputer signal input pin while damaging single-chip microcontroller
Current potential.
Further, the control module 41 in above-described embodiment specifically can be used for starting output services electricity in power supply VCC
By the grounding pin GND1 of the voltage output of the first level terminal V1 to single-chip microcontroller 40 after pressure predetermined time period.
When power supply VCC has just started output services voltage, the operating voltage of output may be smaller, therefore the letter of single-chip microcontroller 40
Number input pin Input may still pass sequentially through clamper module 42, the power pins of single-chip microcontroller 40, single-chip microcontroller 40 inside
Circuit connection to single-chip microcontroller 40 grounding pin GND1, so as to cause the current potential quilt of the signal input pin Input of single-chip microcontroller 40
It drags down.Above-described embodiment is after starting output services voltage predetermined time period, then extremely by the voltage output of the first level terminal V1
The grounding pin GND1 of single-chip microcontroller 40, therefore the above problem can be avoided the occurrence of.
Further, referring to Figure 5, signal input circuit provided in an embodiment of the present invention can further include:
Power Entry Module 43；
Power Entry Module 43 connects the power pins VCC1 of power supply VCC and single-chip microcontroller 40, for export power supply VCC
Operating voltage is transmitted to the power pins VCC1 of single-chip microcontroller 40, and blocks the power pins VCC1 of single-chip microcontroller 40 to power supply VCC
The electric current of output.
The signal input circuit that above-mentioned embodiment illustrated in fig. 4 provides can prevent the signal input pin of single-chip microcontroller 40
Input by the first level terminal V1 electric discharge drags down single-chip microcontroller 40 signal input pin Input current potential, but power supply VCC still
When non-output services voltage, the signal input pin Input of single-chip microcontroller 40 is also possible to discharge by power supply VCC, this can also draw
The current potential of the signal input pin Input of low single-chip microcontroller 40.Power Entry Module 43 in above-mentioned embodiment illustrated in fig. 5 can hinder
The electric current that the power pins VCC1 of disconnected single-chip microcontroller 40 is exported to power supply VCC, therefore can input and draw to avoid the signal of single-chip microcontroller 40
Foot Input is discharged by clamper module 42, the power pins of single-chip microcontroller 40 to power supply VCC, and then guarantees the signal of single-chip microcontroller 40
The current potential of input pin Input is not pulled low.
Optionally, referring to shown in Fig. 6, the control module 41 of signal input circuit provided by the above embodiment includes: first
Transistor T1；
The grounding pin GND1 of the first pole connection single-chip microcontroller 40 of the first transistor T1, the second pole of the first transistor T1 connects
The first level terminal V1 is met, the grid of the first transistor T1 connects power supply VCC.
Optionally, the first level terminal V1 can provide ground voltage.
The control module 41 that above-mentioned embodiment illustrated in fig. 6 provides is greater than or equal to first in power supply VCC output services voltage
When transistor T1 cut-in voltage the first transistor T1 can be connected, thus by the voltage output of the first level terminal V1 to single-chip microcontroller
40 grounding pin GND1, in control module 41, when power supply VCC exports non-output services voltage, the first transistor T1 ends, from
And make the grounding pin GND1 floating of single-chip microcontroller 40.
Further, referring to shown in Fig. 7, the control module 41 of signal input circuit provided by the above embodiment includes: the
One transistor T1, first resistor R1, second resistance R2 and first capacitor C1；
The grounding pin GND1 of the first pole connection single-chip microcontroller 40 of the first transistor T1, the second pole of the first transistor T1 connects
Meet the first level terminal V1, the first end of the grid connection first resistor R1 of the first transistor T1, the first end of second resistance R2 with
And the first pole of first capacitor C1；
The second end of first resistor R1 connects the first level terminal V1；
The second end of second resistance R2 connects power supply VCC；
The second pole of first capacitor C1 connects the first level terminal V1.
Specifically, art technology person can by adjust the capacitance of first capacitor C1, the resistance value of first resistor R2 with
And predetermined time period is adjusted in the resistance value of second resistance R3.
Optionally, the first transistor in above-described embodiment can be metal-oxide semiconductor fieldeffect transistor
(English name: Metal-Oxide-Semiconductor Field-Effect Transistor, referred to as: MOSFET).This
Outside, since the first transistor in above-described embodiment is that the high level exported by power supply VCC is opened, so above-mentioned reality
Apply the N-type transistor be connected when the first transistor T1 in example is grid high level.
Optionally, referring to shown in Fig. 8, the Power Entry Module 43 of signal input circuit provided by the above embodiment includes:
First diode 80；
The anode of first diode 80 connects power supply VCC；The power supply of the cathode connection single-chip microcontroller 40 of first diode 80 draws
Foot VCC1.
Optionally, referring to shown in Fig. 9, the Power Entry Module 43 of signal input circuit provided by the above embodiment includes:
One PNP type triode 90；
The emitter c connection power supply VCC of PNP type triode 90；The collector e connection single-chip microcontroller 40 of PNP type triode 90
Power pins VCC1；The base stage b connection second electrical level end V2 of PNP type triode 61.
Optionally, second electrical level end V2 can provide ground voltage.
The Power Entry Module 43 as shown in Fig. 8/9 is it is found that Power Entry Module 43 is main in signal input circuit
Effect is the effect of one-way conduction, i.e. the power pins VCC1 of the voltage output of permission power supply VCC to single-chip microcontroller 40, single without permitting
The power pins VCC1 of piece machine 40 exports electric current to power supply VCC.
It should also be noted that, the pressure drop of diode is larger, therefore realizes above-mentioned reality by diode compared to triode
When applying the Power Entry Module 43 in example, to being affected for the power supply VCC operating voltage exported, therefore in the embodiment of the present invention
It is preferable to use triodes to realize Power Entry Module 43.In addition, compared to PNP type triode, control PNP type triode conducting
Voltage be that high level if showing the Power Entry Module 43 in above-described embodiment using PNP type triode also needs one
Greater than the control voltage signal of the operating voltage of voltage VCC output, therefore preferably by shown in above-mentioned Fig. 9 in the embodiment of the present invention
Scheme realize Power Entry Module 43.
Further, referring to shown in Fig. 9, upper voltage control module 41 can also include: 3rd resistor R3；
The first end of 3rd resistor R3 connects second electrical level end V2, and the second end of 3rd resistor R3 connects PNP type triode
90 base stage b.
It should be noted that in some embodiments can also be connected by multiple resistance and/or this hair is realized in parallel connection
3rd resistor in bright embodiment can also realize the electricity of the third in the embodiment of the present invention by the biggish conducting wire of resistivity
Resistance, but this belongs to the reasonable work-around solution of the embodiment of the present invention, thus should belong to the embodiment of the present invention protection scope it
It is interior.
Optionally, referring to shown in Fig. 6/7/8/9, the clamper module 42 of signal input circuit provided by the above embodiment is wrapped
It includes: upper diode D1 and the next diode D2；
The cathode of the anode connection signal input pin Input of upper diode D1 and the next diode D2, upper two
The cathode of pole pipe D1 connects upper voltage end VS；
The anode of the next diode D1 connects the next voltage end VX.
The working principle of signal input circuit shown in above-mentioned Fig. 9 is illustrated below.
First stage, in the non-output services voltage of power supply VCC, and signal wire is to the signal input pin of single-chip microcontroller 40
When Input input voltage signal, due to the non-output services voltage of power supply VCC, and signal wire draws to the input of the signal of single-chip microcontroller 40
Foot Input input voltage signal, therefore the upper diode D1 forward conduction of clamper module 42, but due to the list of triode 90
It is acted on to conducting, so the power pins VCC1 of single-chip microcontroller 40 can not export electric current to power supply VCC by triode 90；And because
The first transistor T1 cut-off, so the grounding pin GND1 floating of single-chip microcontroller 40；So the signal input pin of single-chip microcontroller 40
Input can not be discharged by the grounding pin GND1 of power supply VCC or single-chip microcontroller 40, therefore the signal input pin of single-chip microcontroller 40
The point of Input will not be pulled low, and then can make the letter to the signal input pin Input input voltage signal of single-chip microcontroller 40
The voltage of number line is not pulled low.
Second stage, power supply VCC start output services voltage, and synchronous signal line, which continues to input to the signal of single-chip microcontroller 40, to be drawn
Foot Input input voltage signal；When just having started output services voltage due to power supply VCC, the operating voltage of power supply VCC output may
It is smaller, therefore the upper diode D1 of clamper module 42 is still likely to be at forward conduction state.Due to unidirectionally leading for triode 90
Logical effect, so the power pins VCC1 of single-chip microcontroller 40 can not export electric current to power supply VCC by triode 90；Again due to power supply
The working power of VCC output needs to charge to first capacitor C1 after first resistor R1 and second resistance R2 partial pressure, in the first electricity
Before holding cut-in voltage of the voltage less than the first transistor T1 of C1 storage, the first transistor T1 is in off state, therefore single
The grounding pin GND1 floating of piece machine 40；So the signal input pin Input of single-chip microcontroller 40 can not pass through power supply VCC or monolithic
The grounding pin GND1 of machine 40 discharges.That is, the point of the signal input pin Input of this stage single-chip microcontroller 40 will not be pulled low,
And then the voltage of the signal wire to the signal input pin Input input voltage signal of single-chip microcontroller 40 can be made not to be pulled low.
Phase III, when the voltage of first capacitor C1 storage is greater than or equal to the conducting voltage of the first transistor T1, the
One transistor T1 conducting, the first level terminal V1 pass through the first transistor T1 for the voltage output of the first level terminal V1 to single-chip microcontroller 40
Grounding pin, and Power Entry Module 43 exports the operating voltage of power supply VCC to the power pins VCC of single-chip microcontroller 40.By
The power pins VCC1 of the upper voltage end VS connection single-chip microcontroller 40 of clamper module 42, the next voltage end connection of clamper module 42
The grounding pin GND1 of single-chip microcontroller 40, therefore the voltage of the upper voltage end VS of clamper module 42 is the work of power supply VCC output
Voltage, the voltage of the next voltage end of clamper module 42 are the voltage of the first level terminal V1.
If: the voltage of the voltage signal of the signal input pin of input single-chip microcontroller 40 is VI, by voltage clamping module 42
Voltage after clamper is VO, the operating voltage of power supply VCC output is VS, the voltage of the first level terminal V1 is VX, upper diode D1
Pressure drop be VD1, the pressure drop of the next diode D2 is VD2；Then have:
Work as VI>Vs+VD1When, upper diode D1 forward conduction, voltage is pulled low as Vs+VD1, so VO=Vs+VD1；
Work as VI<Vx-VD2When, the next diode D2 forward conduction, voltage is pulled low as Vx-VD2, so VO=Vx-VD2；
Work as Vx-VD2≤V1≤Vs+VD1When, upper diode D1 and bottom diode D2 are turned off, therefore VO=VI；
It can be by the voltage clamping of output signal end in section [Vx-VD2, Vs+VD1] in, to prevent connection signal defeated
The device of outlet Output is damaged by overvoltage.
Yet another embodiment of the invention provides a kind of hot-pluggable optical module, which includes any of the above-described reality
The signal input circuit of example offer is provided.
In the embodiment of the present invention without limitation to the structure of hot-pluggable optical module, type, any includes above-mentioned implementation
The hot-pluggable optical module for the signal input circuit that example provides belongs within the protection scope of the embodiment of the present invention.
The signal input circuit of hot-pluggable optical module provided in an embodiment of the present invention includes: control module and clamper mould
Block；Wherein, control module can be under the control for the operating voltage that power supply exports by the voltage output of the first level terminal to monolithic
The grounding pin of machine, the grounding pin floating of control single chip computer in power supply non-output services voltage；Clamper module can be upper
Pass through the signal input pin input single-chip microcontroller of single-chip microcontroller under the control of the voltage of the voltage of position voltage end and the next voltage end
The voltage of input signal carries out clamper；Therefore the control module of signal input circuit provided in an embodiment of the present invention can be in power supply
The grounding pin floating of control single chip computer when non-output services voltage, and then the signal input pin of single-chip microcontroller is avoided to pass sequentially through
Clamper module, the power pins of single-chip microcontroller, single-chip microcontroller internal circuit and single-chip microcontroller grounding pin discharge the first level terminal,
Drag down the current potential of the signal input pin of single-chip microcontroller；In addition, control module can also be in power supply output services voltage by first
The voltage output of level terminal allows clamper module in the voltage and grounding pin of power pins to the grounding pin of single-chip microcontroller
The voltage for inputting the input signal of single-chip microcontroller under the control of voltage to the signal input pin by single-chip microcontroller carries out clamper, thus
Prevent overvoltage from damaging single-chip microcontroller, i.e. the embodiment of the present invention can be in the single-chip microcontroller for preventing overvoltage damage hot-pluggable optical module
While avoid dragging down hot-pluggable optical module single-chip microcomputer signal input pin current potential.
Optionally, referring to Fig.1 shown in 0, above-mentioned pluggable optical module further include: slow electrification circuit 100.Slow electrification circuit
100 include: transistor 101, resistance 102 and capacitor 103.
When system power supply Tx_Power input voltage, the voltage of system power supply Tx_Power input is first to capacitor 103
It charges, when power supply Tx_Power has just started the pole connecting to capacitor 103 with power supply Tx_Power charging, capacitor 103
Equipotentiality jump can occur for the voltage for the pole connecting with transistor 101, then slowly discharge over the ground, make 101 grid of transistor
Voltage be gradually decrease to zero, when the pole that capacitor 103 is connect with transistor 101 voltage be less than transistor 101 electric conduction
When pressure, transistor 101 is connected, so that the voltage output that system power supply Tx_Power is inputted is to power supply VCC.Due to capacitor 103
It is slow electric discharge can make transistor 11 postpone certain time length after be connected, it is possible to make system power supply Tx_Power input
Voltage postpones with the regular hour, and then reduces the impact to system power supply Tx_Power.
Optionally, the single-chip microcontroller of above-mentioned hot-pluggable optical module includes multiple signal input pins, hot-pluggable optical module
Multiple signal input pins of single-chip microcontroller be separately connected a signal line of IIC and provided respectively by above-described embodiment
Signal input road carry out voltage control.
It can be avoided while the single-chip microcontroller for preventing hot-pluggable optical module is damaged by overvoltage through the foregoing embodiment
The current potential of each signal input pin of the single-chip microcontroller of hot-pluggable optical module is dragged down, and then avoids dragging down the current potential of IIC, is guaranteed
The normal use of IIC.
More than, only a specific embodiment of the invention, but scope of protection of the present invention is not limited thereto, and it is any to be familiar with
In the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of by those skilled in the art, should all cover
Within protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.
Claims (10)
1. a kind of signal input circuit, which is characterized in that the voltage for the signal input pin to single-chip microcontroller controls；Institute
Stating signal input circuit includes: control module and clamper module；
The control module connection provides power supply, the single-chip microcontroller of operating voltage to the single-chip microcontroller by the power pins of single-chip microcontroller
Grounding pin and input to the first level terminal of the control module, the control of the operating voltage for being exported in the power supply
By the grounding pin of the voltage output of first level terminal to the single-chip microcontroller under system, in the non-output services voltage of the power supply
When control the grounding pin floating of the single-chip microcontroller；
The upper voltage end of the clamper module connects the power pins of the single-chip microcontroller, the next voltage end of the clamper module
Connect the grounding pin of the single-chip microcontroller；The clamper module is also connected with the signal input pin of the single-chip microcontroller, in institute
It states under the control of the voltage of upper voltage end and the voltage of the next voltage end to defeated by the signal input pin of the single-chip microcontroller
The voltage for entering the input signal of the single-chip microcontroller carries out clamper.
2. signal input circuit according to claim 1, which is characterized in that the control module is specifically used in the electricity
Source starts the ground connection of the voltage output of first level terminal to the single-chip microcontroller after output services voltage predetermined time period
Pin.
3. signal input circuit according to claim 1, which is characterized in that the signal input circuit further include: power supply
Input module；
The Power Entry Module connects the power pins of the power supply and the single-chip microcontroller, the work for exporting the power supply
Make the power pins of voltage transmission to the single-chip microcontroller, and the power pins of the single-chip microcontroller is blocked to export to the power supply
Electric current.
4. signal input circuit according to claim 1, which is characterized in that the control module includes: the first transistor；
First pole of the first transistor connects the grounding pin of the single-chip microcontroller, the second pole connection of the first transistor
The grid of first level terminal, the first transistor connects the power supply.
5. signal input circuit according to claim 1, which is characterized in that the control module include: the first transistor,
First resistor, second resistance and first capacitor；
First pole of the first transistor connects the grounding pin of the single-chip microcontroller, the second pole connection of the first transistor
First level terminal, the grid of the first transistor connect the first end of the first resistor, the second resistance
One end and the first pole of the first capacitor；
The second end of the first resistor connects first level terminal；
The second end of the second resistance connects the power supply；
Second pole of the first capacitor connects first level terminal.
6. signal input circuit according to claim 3, which is characterized in that
The Power Entry Module includes: first diode；
The anode of the first diode connects the power supply；The cathode of the first diode connects the power supply of the single-chip microcontroller
Pin.
7. signal input circuit according to claim 3, which is characterized in that
The Power Entry Module includes: a PNP type triode；
The emitter of the PNP type triode connects the power supply；The collector of the PNP type triode connects the single-chip microcontroller
Power pins；The base stage of the PNP type triode connects second electrical level end.
8. signal input circuit according to claim 7, which is characterized in that the Power Entry Module further include: third
Resistance；
The first end of the 3rd resistor connects the second electrical level end, and the second end of the 3rd resistor connects the positive-negative-positive
The base stage of triode.
9. signal input circuit according to claim 7, which is characterized in that the second electrical level end provides ground voltage.
10. a kind of hot-pluggable optical module characterized by comprising the described in any item signals of at least one claim 1-9
Input circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710608532.7A CN107391414B (en) | 2017-07-24 | 2017-07-24 | A kind of signal input circuit and hot-pluggable optical module |
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| CN201710608532.7A CN107391414B (en) | 2017-07-24 | 2017-07-24 | A kind of signal input circuit and hot-pluggable optical module |
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| CN107391414A CN107391414A (en) | 2017-11-24 |
| CN107391414B true CN107391414B (en) | 2019-09-20 |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110460381A (en) * | 2019-08-12 | 2019-11-15 | 青岛海信宽带多媒体技术有限公司 | A kind of optical module |
| CN116582185B (en) * | 2023-05-25 | 2024-03-22 | 深圳市航顺芯片技术研发有限公司 | Optical module, optical communication system and power-on method of optical communication system |
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