CN107391414A - 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
- Publication number
- CN107391414A CN107391414A CN201710608532.7A CN201710608532A CN107391414A CN 107391414 A CN107391414 A CN 107391414A CN 201710608532 A CN201710608532 A CN 201710608532A CN 107391414 A CN107391414 A CN 107391414A
- Authority
- CN
- China
- Prior art keywords
- chip microcomputer
- voltage
- signal input
- power supply
- module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
-
- 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 microcomputer.The circuit includes：Control module and clamper module；Control module connection power supply, the grounding pin and the first level terminal of single-chip microcomputer, for under the control of the operating voltage exported in power supply by the grounding pin of the voltage output of the first level terminal to single-chip microcomputer, 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 microcomputer of clamper module, the grounding pin of the next voltage end connection single-chip microcomputer of clamper module；The voltage of input signal for inputting single-chip microcomputer to the signal input pin by single-chip microcomputer under the control of the voltage of upper voltage end and the voltage of the next 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 module.
Background technology
Hot plug (English name：Hot-plugging or Hot Swap) plug.Hot-swappable device allows to use
Family is taken out or accessed in the case where not closing system, do not cut off the electricity supply, therefore hot-swappable device has higher flexibility,
It is with a wide range of applications.
Hot-pluggable optical module of the prior art has the slow electrification circuit for being used for reducing the impact to system power supply, tool
Body, electrification circuit is delayed shown in reference picture 1, when system power supply Tx_Power input voltages, the voltage of input is first to electric capacity
13 are charged, so that the voltage on the grid of transistor 11, by being gradually decrease to zero greatly, transistor 11 slowly turns on, Ran Houzai
By voltage output end VCC power supply is provided to hot-pluggable optical module.Due to transistor 11, slowly conducting can make Tx_Power
Input voltage has regular hour delay, therefore can reduce the impact to system power supply.In addition, shown in reference picture 2, can heat
After plugging the insertion of optical module 21, (the English name of IC bus 23 of system board 22：Inter Integrated
Circuit, referred to as：IIC；Including：SCL/SDA equisignal lines) by 4.7K Ω to 10k Ω resistance (R1/R2) by 3.3V's
In voltage signal access hot-pluggable optical module 21, and as shown in figure 3, each letter of the single-chip microcomputer 31 in hot-pluggable optical module 21
Number input pin is additionally provided with clamp circuit (D1/D2), wherein, to be carried out exemplified by the signal input pin I for connecting SCL in Fig. 3
Explanation.Following defect be present in the structure of above-mentioned hot-pluggable optical module：After the insertion of hot-pluggable optical module 21, slow electrification circuit
Transistor 11 not yet turn on before, the impedance between the internal circuit and ground of the single-chip microcomputer of hot-pluggable optical module is smaller, that is, clamps
Impedance between the upper diode D1 of position circuit negative electrode and ground is smaller, and the power pins VCC1 of single-chip microcomputer can pass through single-chip microcomputer
The other circuits being connected to inside internal circuit and optical module between VCC1 and GND1 discharge over the ground, so as to drag down signal input
Pin I current potential, drag down system board IIC current potential, other devices being now connected with the IIC of system board will be mistakenly considered can
Plug optical module will take the IIC of system board so that the IIC of system board can not normal use, and if by each letter of single-chip microcomputer
Clamp circuit on number input pin removes, then the voltage for inputting single-chip microcomputer will be unrestricted, it is thus possible to can cause overvoltage
Damage single-chip microcomputer.
The content of the invention
Embodiments of the invention provide 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 microcomputer.
To reach above-mentioned purpose, embodiments of the invention adopt the following technical scheme that：
First aspect, there is provided a kind of signal input circuit, the voltage for the signal input pin to single-chip microcomputer are controlled
System, the signal input circuit include：Control module and clamper module；
The control module connects through power supply from the power pins of single-chip microcomputer to single-chip microcomputer offer operating voltage, list
The grounding pin of piece machine and the first level terminal, for electric by described first under the control of the operating voltage exported in the power supply
The voltage output of flush end controls the single-chip microcomputer to the grounding pin of the single-chip microcomputer in the non-output services voltage of the power supply
Grounding pin floating；
The upper voltage end of the clamper module connects the power pins of the single-chip microcomputer, the bottom electricity of the clamper module
The grounding pin of single-chip microcomputer described in press bond；The clamper module is also connected with the signal input pin of the single-chip microcomputer, is used for
The upper voltage end voltage and the next voltage end voltage control under to being drawn by the input of the signal of the single-chip microcomputer
The voltage that pin inputs the input signal of the single-chip microcomputer carries out clamper.
Second aspect, there is provided a kind of hot-pluggable optical module, including：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 of the operating voltage exported in power supply by the grounding pin of the voltage output of the first level terminal to single-chip microcomputer, in power supply
The grounding pin floating of control single chip computer during non-output services voltage；Clamper module can be in upper voltage end voltage and bottom
The voltage for the input signal for inputting single-chip microcomputer by the signal input pin of single-chip microcomputer 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 control in the non-output services voltage of power supply
The grounding pin floating of single-chip microcomputer, and then avoid the signal input pin of single-chip microcomputer from passing sequentially through clamper module, the electricity of single-chip microcomputer
The grounding pin of source pin, single-chip microcomputer internal circuit and single-chip microcomputer discharges the first level terminal, and the signal for dragging down single-chip microcomputer 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 microcomputer, allow clamper module power pins voltage and grounding pin voltage control under to passing through
The voltage of the input signal of the signal input pin input single-chip microcomputer of single-chip microcomputer carries out clamper, so as 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 microcomputer
Current potential.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying 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 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 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.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
The transistor used in all embodiments of the invention can be thin film transistor (TFT) or FET or other characteristic phases
With device, be on-off action according to transistor main function used by effect embodiments of the invention in circuit.By
Source electrode, drain electrode in the transistor used here are symmetrical, so its source electrode, drain electrode can exchange.Of the invention real
Apply in example, to distinguish the two poles of the earth of transistor in addition to grid, wherein will be referred to as the first pole by source electrode, drain electrode is referred to 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 part is drain electrode.In addition this hair
Transistor can be P-type transistor or N-type transistor used by bright embodiment, wherein, P-type transistor is low level in grid
When turn on, end when grid is high level, N-type switching transistor is low electricity in grid to be turned on when grid is high level
Usually end.
It should also be noted that, although triode employed in the embodiment of the present invention is same to include three pins, three
The title of individual pin is respectively colelctor electrode, emitter stage and base stage, and it is base that the pin among triode is provided by the form in accompanying drawing
Pole, the pin of both sides is respectively collector and emitter.It is in place of the triode difference maximum with above-mentioned transistor, transistor
Source electrode, drain electrode be symmetrical, electric current can be flowed to from source electrode and 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 stage from colelctor electrode, or can only flow to and collect from emitter stage
Electrode.Specifically, PNP type triode, electric current can only flow to colelctor electrode from emitter stage, and PNP type triode, electric current can only be from current collection
Pole flows to emitter stage.In addition, the working condition for being different from above-mentioned transistor includes turning on and cut-off state, in the embodiment of the present invention
The working condition of used triode includes：Cut-off, amplification and saturation state.
In addition, for the ease of clearly describing the technical scheme of the embodiment of the present invention, in an embodiment of the present invention, employ
The printed words such as " first ", " second " make a distinction to function and the essentially identical identical entry of effect or similar item, people in the art
Member is appreciated that the printed words such as " first ", " second " are not to be defined to quantity and execution order.
Based on the above, embodiments of the invention provide a kind of signal input circuit, and the signal input circuit is used for pair
The voltage of the signal input pin of single-chip microcomputer is controlled.Specifically, shown in reference picture 4, signal provided in an embodiment of the present invention
Input circuit includes：Control module 41 and clamper module 42.
Control module 41 connects through the power pins VCC1 of single-chip microcomputer 40 to the power supply of the offer operating voltage of single-chip microcomputer 40
VCC, the grounding pin GND1 of single-chip microcomputer 40 and the first level terminal V1, for the control of the operating voltage exported in power supply VCC
The lower voltage output by the first level terminal V1 to single-chip microcomputer 40 grounding pin GND1, in the non-output services voltages of power supply VCC
The grounding pin GND1 floatings of control single chip computer 40.
The power pins VCC1 of the upper voltage end VS connections single-chip microcomputer 40 of clamper module 42, the bottom electricity of clamper module 42
The grounding pin GND1 of pressure side VX connections single-chip microcomputer 40；Clamper module 42 is also connected with the signal input pin Input of single-chip microcomputer 40,
For under the control of upper voltage end VS voltage and the next voltage end VX voltage to being inputted by the signal of single-chip microcomputer 40
The voltage that pin Input inputs the input signal of the single-chip microcomputer 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 of the operating voltage exported in power supply by the grounding pin of the voltage output of the first level terminal to single-chip microcomputer, in power supply
The grounding pin floating of control single chip computer during non-output services voltage；Clamper module can be in upper voltage end voltage and bottom
The voltage for the input signal for inputting single-chip microcomputer by the signal input pin of single-chip microcomputer 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 control in the non-output services voltage of power supply
The grounding pin floating of single-chip microcomputer, and then avoid the signal input pin of single-chip microcomputer from passing sequentially through clamper module, the electricity of single-chip microcomputer
The grounding pin of source pin, single-chip microcomputer internal circuit and single-chip microcomputer discharges the first level terminal, and the signal for dragging down single-chip microcomputer 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 microcomputer, allow clamper module power pins voltage and grounding pin voltage control under to passing through
The voltage of the input signal of the signal input pin input single-chip microcomputer of single-chip microcomputer carries out clamper, so as 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 microcomputer
Current potential.
Further, the control module 41 in above-described embodiment is specific can be used for starting output services electricity in power supply VCC
By the grounding pin GND1 of the first level terminal V1 voltage output to single-chip microcomputer 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 microcomputer 40
Number input pin Input's may still pass sequentially through clamper module 42, the power pins of single-chip microcomputer 40, the inside of single-chip microcomputer 40
Circuit is connected to the grounding pin GND1 of single-chip microcomputer 40, so as to cause the signal input pin Input of single-chip microcomputer 40 current potential quilt
Drag down.Above-described embodiment is after output services voltage predetermined time period is started, then by the first level terminal V1 voltage output extremely
The grounding pin GND1 of single-chip microcomputer 40, therefore above mentioned problem can be avoided the occurrence of.
Further, shown in reference picture 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 microcomputer 40, for export power supply VCC
Operating voltage is transmitted to the power pins VCC1 of single-chip microcomputer 40, and blocks the power pins VCC1 of single-chip microcomputer 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 microcomputer 40
Input drags down the signal input pin Input of single-chip microcomputer 40 current potential by the first level terminal V1 electric discharges, but in power supply VCC still
During non-output services voltage, the signal input pin Input of single-chip microcomputer 40 is also possible to discharge by power supply VCC, and this can also draw
The signal input pin Input of low single-chip microcomputer 40 current potential.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 microcomputer 40 exports to power supply VCC, therefore the signal of single-chip microcomputer 40 can be avoided to input and drawn
Pin Input is discharged by clamper module 42, the power pins of single-chip microcomputer 40 to power supply VCC, and then ensures the signal of single-chip microcomputer 40
Input pin Input current potential is not pulled low.
Optionally, shown in reference picture 6, the control module 41 for the signal input circuit that above-described embodiment provides includes：First
Transistor T1；
The grounding pin GND1 of the first transistor T1 the first pole connection single-chip microcomputer 40, the first transistor T1 the second pole connects
Meet the first level terminal V1, the first transistor T1 grid connection 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 more than or equal to first in power supply VCC output services voltage
When transistor T1 cut-in voltage the first transistor T1 can turn on, so as to by the first level terminal V1 voltage output to single-chip microcomputer
40 grounding pin GND1, the first transistor T1 cut-offs when power supply VCC exports non-output services voltage in control module 41, from
And make the grounding pin GND1 floatings of single-chip microcomputer 40.
Further, shown in reference picture 7, the control module 41 for the signal input circuit that above-described embodiment provides includes：The
One transistor T1, first resistor R1, second resistance R2 and the first electric capacity C1；
The grounding pin GND1 of the first transistor T1 the first pole connection single-chip microcomputer 40, the first transistor T1 the second pole connects
Meet the first level terminal V1, the first transistor T1 grid connection first resistor R1 first end, second resistance R2 first end with
And first electric capacity C1 the first pole；
First resistor R1 the second end connects the first level terminal V1；
Second resistance R2 the second end connection power supply VCC；
First electric capacity C1 the second pole connects the first level terminal V1.
Specifically, art technology person can by adjust the first electric capacity C1 capacitance, first resistor R2 resistance with
And predetermined time period is adjusted second resistance R3 resistance.
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, because the first transistor in above-described embodiment is opened by the power supply VCC high level exported, so above-mentioned reality
Apply the N-type transistor turned on when the first transistor T1 in example is grid high level.
Optionally, shown in reference picture 8, the Power Entry Module 43 for the signal input circuit that above-described embodiment provides includes：
First diode 80；
The anode connection power supply VCC of first diode 80；The power supply of the negative electrode connection single-chip microcomputer 40 of first diode 80 draws
Pin VCC1.
Optionally, shown in reference picture 9, the Power Entry Module 43 for the signal input circuit that above-described embodiment provides includes：
One PNP type triode 90；
The emitter stage c connection power supplys VCC of PNP type triode 90；The colelctor electrode e connections single-chip microcomputer 40 of PNP type triode 90
Power pins VCC1；The base stage b connection second electrical levels end V2 of PNP type triode 61.
Optionally, second electrical level end V2 can provide ground voltage.
Because Power Entry Module 43 shown in Fig. 8/9 understands that Power Entry Module 43 is main in signal input circuit
The effect of one-way conduction is act as, that is, allows power supply VCC voltage output to the power pins VCC1 of single-chip microcomputer 40, it is single without permitting
The power pins VCC1 of piece machine 40 is to power supply VCC output currents.
It should also be noted that, compared to triode, the pressure drop of diode is larger, therefore realizes above-mentioned reality by diode
When applying the Power Entry Module 43 in example, to having a great influence for the power supply VCC operating voltages exported, therefore in the embodiment of the present invention
It is preferred that realize Power Entry Module 43 using triode.In addition, compared to PNP type triode, control PNP type triode conducting
Voltage be high level, if showing the Power Entry Module 43 in above-described embodiment using PNP type triode, also need to one
More than the control voltage signal of the operating voltage of voltage VCC outputs, therefore preferably by shown in above-mentioned Fig. 9 in the embodiment of the present invention
Scheme realize Power Entry Module 43.
Further, shown in reference picture 9, upper voltage control module 41 can also include：3rd resistor R3；
3rd resistor R3 first end connection second electrical level end V2,3rd resistor R3 the second end connection PNP type triode
90 base stage b.
It should be noted that this hair can also be realized by multiple resistant series and/or parallel connection in certain embodiments
3rd resistor in bright embodiment, the 3rd electricity in the embodiment of the present invention can also be realized by the larger wire of resistivity
Resistance, but this belongs to the reasonable work-around solution of the embodiment of the present invention, thus all should belong to the embodiment of the present invention protection domain it
It is interior.
Optionally, shown in reference picture 6/7/8/9, the clamper module 42 for the signal input circuit that above-described embodiment provides is wrapped
Include：Upper diode D1 and the next diode D2；
Upper diode D1 anode connection signal input pin Input and the next diode D2 negative electrode, upper two
Pole pipe D1 negative electrode connects upper voltage end VS；
The next diode D1 anode connects the next voltage end VX.
The operation principle of signal input circuit shown in above-mentioned Fig. 9 is illustrated below.
First stage, in the non-output services voltages of power supply VCC, and signal wire is to the signal input pin of single-chip microcomputer 40
During Input input voltage signals, due to the non-output services voltages of power supply VCC, and signal input of the signal wire to single-chip microcomputer 40 is drawn
Pin Input input voltage signals, therefore the upper diode D1 forward conductions of clamper module 42, but due to the list of triode 90
Acted on to conducting, so the power pins VCC1 of single-chip microcomputer 40 can not be by triode 90 to power supply VCC output currents；And because
The first transistor T1 ends, so the grounding pin GND1 floatings of single-chip microcomputer 40；So signal input pin of single-chip microcomputer 40
Input can not be discharged by the grounding pin GND1 of power supply VCC or single-chip microcomputer 40, therefore the signal input pin of single-chip microcomputer 40
Input point position will not be pulled low, and then can make the letter of the signal input pin Input input voltage signals to single-chip microcomputer 40
The voltage of number line is not pulled low.
Second stage, power supply VCC start output services voltage, and the signal input that synchronous signal line continues to single-chip microcomputer 40 is drawn
Pin Input input voltage signals；When just having started output services voltage due to power supply VCC, the operating voltage of power supply VCC outputs may
It is smaller, therefore the upper diode D1 of clamper module 42 is still likely to be at forward conduction state.Unidirectional due to triode 90 is led
Logical effect, so the power pins VCC1 of single-chip microcomputer 40 can not be by triode 90 to power supply VCC output currents；Again due to power supply
The working power of VCC outputs needs to charge to the first electric capacity C1 after first resistor R1 and second resistance R2 partial pressures, in the first electricity
Before holding cut-in voltage of the voltage less than the first transistor T1 of C1 storages, the first transistor T1 is in cut-off state, therefore single
The grounding pin GND1 floatings of piece machine 40；So the signal input pin Input of single-chip microcomputer 40 can not pass through power supply VCC or monolithic
The grounding pin GND1 electric discharges of machine 40.That is, the point position of the signal input pin Input of this stage single-chip microcomputer 40 will not be pulled low,
And then the voltage of the signal wire of the signal input pin Input input voltage signals to single-chip microcomputer 40 can be made not to be pulled low.
Phase III, when the voltage of the first electric capacity C1 storages is more than or equal to the first transistor T1 conducting voltage, the
One transistor T1 is turned on, and the first level terminal V1 is by the first transistor T1 by the first level terminal V1 voltage output to single-chip microcomputer 40
Grounding pin, and Power Entry Module 43 exports power supply VCC operating voltage to the power pins VCC of single-chip microcomputer 40.By
The power pins VCC1 of the upper voltage end VS connections single-chip microcomputer 40 of clamper module 42, the next voltage end connection of clamper module 42
The grounding pin GND1 of single-chip microcomputer 40, therefore the upper voltage end VS of clamper module 42 voltage is the work of power supply VCC outputs
Voltage, the voltage of the next voltage end of clamper module 42 are the first level terminal V1 voltage.
If：The voltage for inputting the voltage signal of the signal input pin of single-chip microcomputer 40 is VI, by voltage clamping module 42
Voltage after clamper is VO, the operating voltage of power supply VCC outputs is VS, the first level terminal V1 voltage is VX, upper diode D1
Pressure drop be VD1, the next diode D2 pressure drop is VD2；Then have：
Work as VI>Vs+VD1When, upper diode D1 forward conductions, voltage is pulled low as Vs+VD1, so VO=Vs+VD1；
Work as VI<Vx-VD2When, the next diode D2 forward conductions, voltage is pulled low as Vx-VD2, so VO=Vx-VD2；
Work as Vx-VD2≤V1≤Vs+VD1When, upper diode D1 and the next diode D2 are turned off, therefore VO=VI；
Can be by the voltage clamping of output signal end in section [Vx-VD2, Vs+VD1] in, so as to prevent connection signal defeated
Go out to hold Output device to be damaged by overvoltage.
Yet another embodiment of the invention provides a kind of hot-pluggable optical module, and the hot-pluggable optical module includes any of the above-described reality
The signal input circuit of example offer is provided.
Structure, the type of hot-pluggable optical module are not limited in the embodiment of the present invention, it is any including above-mentioned implementation
The hot-pluggable optical module for the signal input circuit that example provides is belonged within the protection domain 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
Single-chip microcomputer is inputted by the signal input pin of single-chip microcomputer under the control of the voltage of position voltage end and the voltage of 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 during non-output services voltage, and then avoid the signal input pin of single-chip microcomputer from passing sequentially through
Clamper module, the power pins of single-chip microcomputer, the grounding pin of single-chip microcomputer internal circuit and single-chip microcomputer discharge the first level terminal,
Drag down the current potential of the signal input pin of single-chip microcomputer；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 microcomputer
The voltage for inputting the input signal of single-chip microcomputer under the control of voltage to the signal input pin by single-chip microcomputer carries out clamper, so as to
Prevent overvoltage from damaging single-chip microcomputer, i.e. the embodiment of the present invention can prevent the single-chip microcomputer of overvoltage damage hot-pluggable optical module
While avoid dragging down hot-pluggable optical module single-chip microcomputer signal input pin current potential.
Optionally, shown in reference picture 10, above-mentioned pluggable optical module also includes：Slow electrification circuit 100.Slow electrification circuit
100 include：Transistor 101, resistance 102 and electric capacity 103.
When system power supply Tx_Power input voltages, the voltage of system power supply Tx_Power inputs is first to electric capacity 103
Charged, when power supply Tx_Power has just started the pole charging being connected to electric capacity 103 with power supply Tx_Power, electric capacity 103
Equipotentiality saltus step can occur for the voltage for the pole being connected with transistor 101, then slowly discharge over the ground, make the grid of transistor 101
Voltage be gradually decrease to zero, when the pole that electric capacity 103 is connected with transistor 101 voltage be less than transistor 101 electric conduction
During pressure, transistor 101 turns on, so as to by the voltage output that system power supply Tx_Power is inputted to power supply VCC.Due to electric capacity 103
Slow electric discharge can make transistor 11 postpone certain time length after turn on, it is possible to make system power supply Tx_Power input
Voltage has regular hour delay, and then reduces the impact to system power supply Tx_Power.
Optionally, the single-chip microcomputer of above-mentioned hot-pluggable optical module includes multiple signal input pins, hot-pluggable optical module
Multiple signal input pins of single-chip microcomputer connect an IIC signal line respectively and provided respectively by above-described embodiment
Signal input road carry out voltage control.
It can be avoided by above-described embodiment while preventing the single-chip microcomputer of hot-pluggable optical module from being damaged by overvoltage
The current potential of each signal input pin of the single-chip microcomputer of hot-pluggable optical module is dragged down, and then avoids dragging down IIC current potential, is ensured
IIC normal use.
More than, it is only embodiment of the invention, but protection scope of the present invention is not limited thereto, and it is any to be familiar with
Those skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in should all be covered
Within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
Claims (10)
1. a kind of signal input circuit, it is characterised in that the voltage for the signal input pin to single-chip microcomputer is controlled；Institute
Stating signal input circuit includes：Control module and clamper module；
The control module connects through power supply from the power pins of single-chip microcomputer to single-chip microcomputer offer operating voltage, single-chip microcomputer
Grounding pin and the first level terminal, under the control of the operating voltage exported in the power supply by first level terminal
Voltage output to the grounding pin of the single-chip microcomputer, control connecing for the single-chip microcomputer in the non-output services voltage of the power supply
Ground pin floating；
The upper voltage end of the clamper module connects the power pins of the single-chip microcomputer, the next voltage end of the clamper module
Connect the grounding pin of the single-chip microcomputer；The clamper module is also connected with the signal input pin of the single-chip microcomputer, in institute
State 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 microcomputer
The voltage for entering the input signal of the single-chip microcomputer carries out clamper.
2. signal input circuit according to claim 1, it is characterised 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 microcomputer after output services voltage predetermined time period
Pin.
3. signal input circuit according to claim 1, it is characterised in that the signal input circuit also includes：Power supply
Input module；
The Power Entry Module connects the power pins of the power supply and the single-chip microcomputer, for the work for exporting the power supply
Transmitted as voltage to the power pins of the single-chip microcomputer, and block what the power pins of the single-chip microcomputer exported to the power supply
Electric current.
4. signal input circuit according to claim 1, it is characterised in that the control module includes：The first transistor；
First pole of the first transistor connects the grounding pin of the single-chip microcomputer, the second pole connection of the first transistor
First level terminal, the grid of the first transistor connect the power supply.
5. signal input circuit according to claim 1, it is characterised in that the control module includes：The first transistor,
First resistor, second resistance and the first electric capacity；
First pole of the first transistor connects the grounding pin of the single-chip microcomputer, 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 of the second resistance
One end and the first pole of first electric capacity；
Second end of the first resistor connects first level terminal；
Second end of the second resistance connects the power supply；
Second pole of first electric capacity connects first level terminal.
6. signal input circuit according to claim 3, it is characterised in that
The Power Entry Module includes：First diode；
The anode of first diode connects the power supply；The negative electrode of first diode connects the power supply of the single-chip microcomputer
Pin.
7. signal input circuit according to claim 3, it is characterised in that
The Power Entry Module includes：One PNP type triode；
The emitter stage of the PNP type triode connects the power supply；The colelctor electrode of the PNP type triode connects the single-chip microcomputer
Power pins；The base stage connection second electrical level end of the PNP type triode.
8. signal input circuit according to claim 7, it is characterised in that the Power Entry Module also includes：3rd
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, it is characterised in that the second electrical level end provides ground voltage.
A kind of 10. hot-pluggable optical module, it is characterised in that including：Signal described at least one any one of claim 1-9
Input circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608532.7A CN107391414B (en) | 2017-07-24 | 2017-07-24 | A kind of signal input circuit and hot-pluggable optical module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710608532.7A CN107391414B (en) | 2017-07-24 | 2017-07-24 | A kind of signal input circuit and hot-pluggable optical module |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107391414A true CN107391414A (en) | 2017-11-24 |
| CN107391414B CN107391414B (en) | 2019-09-20 |
Family
ID=60337621
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710608532.7A Active CN107391414B (en) | 2017-07-24 | 2017-07-24 | A kind of signal input circuit and hot-pluggable optical module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107391414B (en) |
Cited By (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 |
| CN116582185A (en) * | 2023-05-25 | 2023-08-11 | 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 |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6286066B1 (en) * | 1998-12-15 | 2001-09-04 | Dell U.S.A., L.P. | Hot-plug interface for detecting adapter card insertion and removal |
| US20070136504A1 (en) * | 2005-12-12 | 2007-06-14 | Inventec Corporation | Hot-plug control system and method |
| CN201035570Y (en) * | 2007-04-30 | 2008-03-12 | 青岛海信电器股份有限公司 | Smart card hot swap circuit and television set with the same |
| CN201499153U (en) * | 2009-08-27 | 2010-06-02 | 青岛海信宽带多媒体技术有限公司 | Slow start circuit and optical module comprising same |
| CN101854051A (en) * | 2010-05-27 | 2010-10-06 | 艾默生网络能源有限公司 | Hot plug device of high-voltage DC UPS |
| CN104571414A (en) * | 2014-11-24 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Hot-plug fan power-taking circuit and method in RACK equipment cabinet |
| EP2902871A1 (en) * | 2012-09-25 | 2015-08-05 | NEC Display Solutions, Ltd. | Electronic device, communication system, and hot-plug control method |
| CN105699756A (en) * | 2016-04-25 | 2016-06-22 | 国网冀北电力有限公司电力科学研究院 | Electronic load ripple detection device |
| CN106055506A (en) * | 2016-05-26 | 2016-10-26 | 浪潮电子信息产业股份有限公司 | Method for improving reliability of hot-plug unit of storage server |
-
2017
- 2017-07-24 CN CN201710608532.7A patent/CN107391414B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6286066B1 (en) * | 1998-12-15 | 2001-09-04 | Dell U.S.A., L.P. | Hot-plug interface for detecting adapter card insertion and removal |
| US20070136504A1 (en) * | 2005-12-12 | 2007-06-14 | Inventec Corporation | Hot-plug control system and method |
| CN201035570Y (en) * | 2007-04-30 | 2008-03-12 | 青岛海信电器股份有限公司 | Smart card hot swap circuit and television set with the same |
| CN201499153U (en) * | 2009-08-27 | 2010-06-02 | 青岛海信宽带多媒体技术有限公司 | Slow start circuit and optical module comprising same |
| CN101854051A (en) * | 2010-05-27 | 2010-10-06 | 艾默生网络能源有限公司 | Hot plug device of high-voltage DC UPS |
| EP2902871A1 (en) * | 2012-09-25 | 2015-08-05 | NEC Display Solutions, Ltd. | Electronic device, communication system, and hot-plug control method |
| CN104571414A (en) * | 2014-11-24 | 2015-04-29 | 浪潮电子信息产业股份有限公司 | Hot-plug fan power-taking circuit and method in RACK equipment cabinet |
| CN105699756A (en) * | 2016-04-25 | 2016-06-22 | 国网冀北电力有限公司电力科学研究院 | Electronic load ripple detection device |
| CN106055506A (en) * | 2016-05-26 | 2016-10-26 | 浪潮电子信息产业股份有限公司 | Method for improving reliability of hot-plug unit of storage server |
Non-Patent Citations (2)
| Title |
|---|
| TIMONTHY HEGARTY: ""热插拔电路的TVS钳位"", 《世界电子元器件》 * |
| 李坤贺 等: ""基于LTC4364-2 的热插拔保护电路"", 《兵工自动化》 * |
Cited By (3)
| 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 |
| CN116582185A (en) * | 2023-05-25 | 2023-08-11 | 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 |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107391414B (en) | 2019-09-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106128352B (en) | GOA unit, driving method, GOA circuit and display device | |
| CN106601176A (en) | Shift register unit circuit, driving method, shift register and display device | |
| CN104883038A (en) | Half-bridge circuit employing negative voltage to turn off half-bridge circuit driver, and method | |
| CN105931595A (en) | Shift register unit, driving method, grid drive circuit, and display device | |
| CN208607658U (en) | A kind of I2C level shifting circuit of adjustable logic level | |
| CN107391414B (en) | A kind of signal input circuit and hot-pluggable optical module | |
| CN106532867B (en) | A kind of charging circuit and mobile terminal | |
| CN107316598A (en) | A kind of hot plug fault control device and method | |
| CN110365324A (en) | A kind of power tube gate driving circuit | |
| CN106602532B (en) | Current-limiting circuit and its driving method, PMIC protection system and display apparatus protecting system | |
| CN107894933A (en) | Support the CMOS output buffers of cold standby application | |
| CN206097104U (en) | Hot plug protection circuit and electronic equipment | |
| CN101179185B (en) | USB interface short-circuit protection circuit and power supply with USB interface short-circuit protection function | |
| CN104038207B (en) | A kind of switching circuit and electronic equipment | |
| CN106786461B (en) | A kind of voltage is counter to fill processing circuit | |
| CN102957415B (en) | Level converting method and level converting system | |
| CN102638257A (en) | Output circuit, system including output circuit, and method of controlling output circuit | |
| CN109951183A (en) | A kind of chip, signal shift circuit and electronic equipment | |
| CN209572001U (en) | A kind of driving circuit and level shifting circuit of signal transfer tube | |
| CN103312313B (en) | A kind of control method of rail-to-rail enable signal, circuit and level shifting circuit | |
| CN105915209B (en) | A kind of multifunctional low power consumption fuse trims control circuit and its control method | |
| CN112133238B (en) | Drive circuit and electronic device | |
| CN204291209U (en) | Multifunctional interface circuit | |
| CN106788493A (en) | A kind of low speed transmitter circuit | |
| CN207458047U (en) | A kind of single line serial port feed enhancing circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |