CN205910306U - USB port control chip assay circuit that charges - Google Patents
USB port control chip assay circuit that charges Download PDFInfo
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- CN205910306U CN205910306U CN201620841135.5U CN201620841135U CN205910306U CN 205910306 U CN205910306 U CN 205910306U CN 201620841135 U CN201620841135 U CN 201620841135U CN 205910306 U CN205910306 U CN 205910306U
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Abstract
The utility model discloses a USB port control chip assay circuit that charges adopts pressure differential output module, threshold value production circuit, comparison circuit and logical decision circuit to set up and forms. The utility model discloses a detection circuitry can detect USB charge the data transmission anode of port control chip, the working range of data transmission negative terminal, judges whether recognition chip welds good and reliable work to a dependable performance nature that the USB port control chip that charges has been ensured in the corresponding instruction of is provided. The utility model has the advantages of: 1, can be comprehensively charge the port control chip to USB and detect, including whether weld well, whether can reliably work, 2, detection circuitry simple structure, to detect the cost lower, 3, measurement personnel's work efficiency has been improved, 4, the charge dependable performance nature of port control chip of USB has been improved.
Description
Technical field
The utility model is related to integrated circuit fields and in particular to a kind of usb charging port control chip testing circuit.
Background technology
In portable power source or intelligent charger, usb (universal serial bus USB) charges
Port controller can monitor usb data circuit voltage with automatic detection characteristic, and automatically provides correct on data circuit
Electric characteristic, charges for compatible equipment in special charging system configuration.When portable power source or intelligent charger produce, need
Detect whether usb charging port control chip welds well, output is normal, otherwise whole charging system cisco unity malfunction.
Utility model content
The purpose of this utility model is to solve in prior art usb charging port control chip before production is dispatched from the factory
Detection complex procedures, and can not the multiple function of detection chip simultaneously problem, thus leading to usb charging port control chip
The problem that performance reliability reduces；A kind of usb charging port control chip testing circuit is provided.
In order to achieve the above object, the utility model is achieved through the following technical solutions:
A kind of usb charging port control chip testing circuit, described testing circuit comprises:
Pressure reduction output module, described pressure reduction output module is connected with usb charging port control chip to be detected so that institute
State the output of the output signal voltage of data transfer anode of usb charging port control chip to be detected and data transfer negative terminal
Signal voltage has pressure reduction；
Comparison circuit, the input of described comparison circuit obtains first threshold voltage signal, second threshold voltage letter respectively
Number, and the data transfer anode with described usb charging port control chip to be detected, data transfer negative terminal be connected；Described ratio
Export respectively compared with circuit: judge described data transfer anode and described data transfer negative terminal whether short-circuit signal, judge described number
According to transmission anode whether open circuit signaling, judge described data transfer negative terminal whether open circuit signaling, judge described data transfer anode
The voltage of output signal whether signal in normal range (NR), whether the voltage judging described data transfer negative terminal output signal is just
Often range signals；
Logic judging circuit, obtains the described judgement described data transfer anode of described comparison circuit output end output respectively
And described data transfer negative terminal whether short-circuit signal, described judge whether open circuit signaling, the described judgement of described data transfer anode
Whether whether open circuit signaling, the described voltage judging described data transfer anode output signal are normal for described data transfer negative terminal
Range signals, the described voltage judging described data transfer negative terminal output signal whether signal in normal range (NR), and carry out
Logic judgment.
It is preferred that described first threshold voltage signal, described second threshold voltage signal are all by threshold generation circuits
Produce, described threshold generation circuits comprise:
Low-dropout linear voltage-regulating circuit, the input voltage of described low-dropout linear voltage-regulating circuit and described usb to be detected
The input voltage of charging port control chip is identical；
First threshold voltage output circuit, the input of described first threshold voltage output circuit and described low pressure difference linearity
The output end of mu balanced circuit connects, the output end output described first threshold voltage letter of described first threshold voltage output circuit
Number；
Second threshold voltage output circuit, the input of described second threshold voltage output circuit and described low pressure difference linearity
The output end of mu balanced circuit connects, the output end output described second threshold voltage letter of described second threshold voltage output circuit
Number.
It is preferred that described first threshold voltage output circuit comprises:
First impedance, one end of described first impedance is connected with the output end of described low-dropout linear voltage-regulating circuit；
Second impedance, one end of described second impedance is connected with the other end of described first impedance, described second impedance
The other end is grounded；
The output end of described first threshold voltage output circuit is the tie point of described first impedance and described second impedance；
Described first impedance is 1: 10 with the impedance ratio of described second impedance.
It is preferred that described second threshold voltage output circuit comprises:
3rd impedance, one end of described 3rd impedance is connected with the output end of described low-dropout linear voltage-regulating circuit；
4th impedance, one end of described 4th impedance is connected with the other end of described 3rd impedance, described 4th impedance
The other end is grounded；
The output end of described second threshold voltage output circuit is the tie point of described 3rd impedance and described 4th impedance；
Described 3rd impedance is 1: 1 with the impedance ratio of described 4th impedance.
It is preferred that described pressure reduction output module comprises: step-down impedance；Described step-down impedance one end with described to be detected
The data transfer anode of usb charging port control chip connects, the other end ground connection of described step-down impedance.
It is preferred that described pressure reduction output module comprises: step-down impedance；Described step-down impedance one end with described to be detected
The data transfer negative terminal of usb charging port control chip connects, the other end ground connection of described step-down impedance.
It is preferred that described comparison circuit comprises:
First comparing unit circuit, comprises first comparator；The positive input of described first comparator is to be checked with described
The data transfer negative terminal of the usb charging port control chip surveyed connects, and the negative input of described first comparator is treated with described
The data transfer anode of the usb charging port control chip of detection connects；
Second comparing unit circuit, comprises the second comparator；The positive input of described second comparator and described data
Transmission anode connects, and the negative input of described second comparator obtains described second threshold voltage signal；
3rd comparing unit circuit, comprises the 3rd comparator；The positive input of described 3rd comparator obtains described the
One threshold voltage signal, the negative input of described 3rd comparator is connected with described data transfer anode；
4th comparing unit circuit, comprises the 4th comparator；The positive input of described 4th comparator and described data
Transmission negative terminal connects, and the negative input of described 4th comparator obtains described second threshold voltage signal；
5th comparing unit circuit, comprises the 5th comparator；The positive input of described 5th comparator obtains described the
One threshold voltage signal, the negative input of described 5th comparator is connected with described data transfer negative terminal.
It is preferred that described comparison circuit comprises:
First comparing unit circuit, comprises first comparator；The positive input of described first comparator is to be checked with described
The data transfer anode of the usb charging port control chip surveyed connects, and the negative input of described first comparator is treated with described
The data transfer negative terminal of the usb charging port control chip of detection connects；
Second comparing unit circuit, comprises the second comparator；The positive input of described second comparator and described data
Transmission anode connects, and the negative input of described second comparator obtains described second threshold voltage signal；
3rd comparing unit circuit, comprises the 3rd comparator；The positive input of described 3rd comparator obtains described the
One threshold voltage signal, the negative input of described 3rd comparator is connected with described data transfer anode；
4th comparing unit circuit, comprises the 4th comparator；The positive input of described 4th comparator and described data
Transmission negative terminal connects, and the negative input of described 4th comparator obtains described second threshold voltage signal；
5th comparing unit circuit, comprises the 5th comparator；The positive input of described 5th comparator obtains described the
One threshold voltage signal, the negative input of described 5th comparator is connected with described data transfer negative terminal.
It is preferred that described logic judging circuit comprises:
First logic circuit, comprises the first logic and operation device, the first input end of described first logic and operation device with
The output end of described second comparing unit circuit connects, and the second input of described first logic and operation device and the described 3rd compares
Connect compared with the output end of element circuit；
Second logic circuit, comprises the second logic and operation device, the first input end of described second logic and operation device with
The output end of described 4th comparing unit circuit connects, and the second input of described second logic and operation device and the described 5th compares
Connect compared with the output end of element circuit；
3rd logic circuit, comprises the 3rd logic and operation device, the first input end of described 3rd logic and operation device with
The output end of described first logic circuit connects, and the second input of described 3rd logic and operation device is electric with described second logic
The output end on road connects；
4th logic circuit, comprises the 4th logic and operation device, the first input end of described 4th logic and operation device with
The output end of described first comparing unit circuit connects, and the second input of described 4th logic and operation device is patrolled with the described 3rd
The output end collecting circuit connects.
It is preferred that described logic judging circuit also comprises display circuit, described display circuit comprises:
5th impedance, one end of described 5th impedance is connected with external power source；
First light emitting diode, the positive pole of described first light emitting diode is connected with the other end of described 5th impedance, institute
The negative pole stating the first light emitting diode is connected with the output end of described 4th logical AND circuit；
6th impedance, one end of described 6th impedance is connected with the output end of described 4th logical AND circuit；
Second light emitting diode, the positive pole of described second light emitting diode pipe is connected with the other end of described 6th impedance,
The minus earth of described second light emitting diode.
On the basis of meeting common sense in the field, above-mentioned each optimum condition, can be combined, obtain final product the utility model each relatively
Good example.
Positive effect of the present utility model is:
A kind of usb charging port control chip testing circuit disclosed in the utility model, using pressure reduction output module, threshold value
Produce circuit, comparison circuit and logic judging circuit establishment to form.Testing circuit disclosed in the utility model can detect that usb fills
The data transfer anode of electric port controlling chip, the working range of data transfer negative terminal, judge whether identification chip welds well
And reliably working, and provide corresponding instruction it is ensured that the performance reliability of usb charging port control chip.The utility model
Advantage be: 1, usb charging port control chip can be detected comprehensively, include whether that welding is good, if occur
Short circuit or open circuit conditions, if being capable of reliably working；2nd, testing circuit structure is simple, testing cost is relatively low；3rd, improve detection
The operating efficiency of personnel；4th, improve the performance reliability of usb charging port control chip.
Brief description
Fig. 1 is a kind of overall structure block diagram of the utility model usb charging port control chip testing circuit.
Fig. 2 is a kind of threshold generation circuits figure of the utility model usb charging port control chip testing circuit.
Fig. 3-1 is a kind of the first comparing unit circuit diagram of the utility model usb charging port control chip testing circuit.
Fig. 3-2 is a kind of the second comparing unit circuit diagram of the utility model usb charging port control chip testing circuit.
Fig. 3-3 is a kind of the 3rd comparing unit circuit diagram of the utility model usb charging port control chip testing circuit.
Fig. 3-4 is a kind of the 4th comparing unit circuit diagram of the utility model usb charging port control chip testing circuit.
Fig. 3-5 is a kind of the 5th comparing unit circuit diagram of the utility model usb charging port control chip testing circuit.
Fig. 4 is a kind of logic judging circuit figure of the utility model usb charging port control chip testing circuit.
Fig. 5 be a kind of the utility model usb charging port control chip testing circuit in pressure reduction output module with to be measured
Usb charging port control chip connection diagram.
Specific embodiment
Mode below by embodiment further illustrates the utility model, but is not therefore limited in the utility model
Among described scope of embodiments.The experimental technique of unreceipted actual conditions in the following example, conventionally and condition,
Or select according to catalogue.
As shown in figure 1, a kind of usb charging port control chip testing circuit, this testing circuit comprises: pressure reduction output module
1st, threshold generation circuits 2, comparison circuit 3 and logic judging circuit 4.Wherein, comparison circuit 3 is charged with usb to be detected respectively
Port controlling chip, threshold generation circuits 2 and logic judging circuit 4 connect, and pressure reduction output module 1 is charged with usb to be detected
Port controlling chip connects.
In the utility model, threshold generation circuits 2 are used for exporting first threshold voltage signal v1, second threshold voltage signal
v2；Comparison circuit 3 obtains first threshold voltage signal v1, the second threshold voltage signal v2 of threshold generation circuits 2 output, simultaneously
It is connected with the data transfer anode dp of pressure reduction output module 1, data transfer negative terminal dm；Logic judging circuit 4 obtains comparison circuit 3
The comparative result signal of output simultaneously carries out logical process and display.
As shown in figure 5, pressure reduction output module 1 is connected with usb charging port control chip 11.In the present embodiment, pressure reduction is defeated
Go out module 1 and comprise a step-down impedance r10.
The pin of usb charging port control chip 11 comprises: power end vin, earth terminal gnd, data transfer anode dp and
Data transfer negative terminal dm.Wherein, data transfer anode dp is as the data transfer anode dp of pressure reduction output module 1；Data transfer
Negative terminal dm is as the data transfer negative terminal dm of pressure reduction output module 1.The power end vin of usb charging port control chip 11 obtains
Input voltage, earth terminal gnd is grounded.
In the present embodiment, one end of step-down impedance r10 is connected with data transfer anode dp, the other end of step-down impedance r10
Ground connection.In the utility model, in usb charging port control chip 11 normal work, data transfer anode dp, data transfer are born
The output valve all same of end dm, then cannot judge data transfer anode dp, data transfer negative terminal by general voltage detecting
Whether dm is short-circuit.And, because data transfer anode dp has output impedance, then the utility model using step-down impedance r10 with
Data transfer anode dp connects, and can reduce the output voltage of data transfer anode dp transmission signal so that data transfer anode
There is larger pressure reduction, for completing using comparison circuit 3 below between dp transmission signal and data transfer negative terminal dm transmission signal
The short-circuit ratio of data transfer anode dp and data transfer negative terminal dm relatively designs offer condition.
In the present embodiment, using model 2514a usb charging port control chip as detection object.This chip
The input voltage that power end vin requires is 5v, the data transfer anode dp of this chip, the transmission signal electricity of data transfer negative terminal dm
Pressure value is 2.7v.
In actual use, the power end vin of general usb charging port control chip is usually 4.5v-5.5v,
Data transfer anode dp, the transmission signal magnitude of voltage of data transfer negative terminal dm are usually 2.56v-2.87v.
As shown in Fig. 2 threshold generation circuits 2 comprise: low-dropout linear voltage-regulating circuit 21, first threshold voltage output circuit
22 and second threshold voltage output circuit 23.The input of first threshold voltage output circuit 22 and low-dropout linear voltage-regulating circuit
21 output end connects, and the input of second threshold voltage output circuit 23 is connected with the output end of low-dropout linear voltage-regulating circuit 21
Connect.Wherein, the input voltage of low-dropout linear voltage-regulating circuit 21 is identical with the input voltage of pressure reduction output module 1.First threshold
The output end output first threshold voltage signal v1 of voltage follower circuit 22；The output end of second threshold voltage output circuit 23 is defeated
Go out second threshold voltage signal v2.
In the present embodiment, in view of the input that the power end vin of the usb charging port control chip of model 2514a requires
Voltage is 5v, then the input voltage of low-dropout linear voltage-regulating circuit 21 is 5v.
In the utility model, low-dropout linear voltage-regulating circuit 21 comprises low pressure difference linear voltage regulator 211, the first electric capacity c4,
Second electric capacity c5.Wherein, the voltage input end vi input of low pressure difference linear voltage regulator 211 is defeated with pressure reduction output module 1 identical
Enter voltage；And one end of the first electric capacity c4 is connected with the voltage input end vi of low pressure difference linear voltage regulator 211, the first electric capacity c4
The other end ground connection；The voltage output end vo of low pressure difference linear voltage regulator 211 respectively with first threshold voltage output circuit 22
Input, the input of second threshold voltage output circuit 23 connect；And one end of the second electric capacity c5 is steady with low pressure difference linearity
The voltage output end vo of depressor 211 connects, the other end ground connection of the second electric capacity c5；The earth terminal of low pressure difference linear voltage regulator 211
Vss is grounded.The output end of low-dropout linear voltage-regulating circuit 21 is the voltage output end vo of low pressure difference linear voltage regulator 211.
As shown in Fig. 2 first threshold voltage output circuit 22 comprises: the first impedance r16, the second impedance r18.First impedance
One end of r16 is connected with the output end of low-dropout linear voltage-regulating circuit 21；One end of second impedance r18 is with the first impedance r16's
The other end connects, the other end ground connection of the second impedance r18.The output end of first threshold voltage output circuit 22 is the first impedance
R16 and the tie point of the second impedance r18.The impedance ratio requiring the first impedance r16 and the second impedance r18 in the utility model is 1:
10.
As shown in Fig. 2 second threshold voltage output circuit 23 comprises: the 3rd impedance r15, the 4th impedance r17.Wherein,
One end of three impedance r15 is connected with the output end of low-dropout linear voltage-regulating circuit 21；One end of 4th impedance r17 and the 3rd impedance
The other end of r15 connects, the other end ground connection of the 4th impedance r17.The output end of second threshold voltage output circuit 23 is the 3rd
Impedance r15 and the tie point of the 4th impedance r17.The impedance ratio of the 3rd impedance r15 and the 4th impedance r17 is required in the utility model
For 1: 1.
In the present embodiment, in view of the input voltage of usb charging port control chip is 5v, the data transfer anode of this chip
Dp, the transmission signal magnitude of voltage of data transfer negative terminal dm is 2.7v, then the first threshold voltage signal v1's of sets requirement is defeated
Go out voltage be 3v, require for 1.65v.In order to reach above-mentioned requirements, the first electric capacity c4, the value of the second electric capacity c5 is all in 1uf-
Between 10uf, the first electric capacity c4 in the present embodiment, the second electric capacity c5 is 10uf.Meanwhile, the first impedance r16, the second impedance r18
Value is 3k ω, 30k ω respectively；3rd impedance r15, the equal value of the 4th impedance r17 are 30k ω.
In actual use, the output voltage range of the first threshold voltage signal v1 of sets requirement is 2.9v-
The output voltage range of 3.2v, the second threshold voltage signal v2 of sets requirement is 1.4v-1.8v.
Comparison circuit 3 comprises: the first comparing unit circuit 31, the second comparing unit circuit 32, the 3rd comparing unit circuit
33rd, the 4th comparing unit circuit 34 and the 5th comparing unit circuit 35.
As shown in figure 3-1, the first comparing unit circuit 31 comprises first comparator 311.The forward direction of first comparator 311 is defeated
Enter end to be connected with the data transfer negative terminal dm of pressure reduction output module 1, the negative input of first comparator 311 exports mould with pressure reduction
The data transfer anode dp of block 1 connects.In the utility model, the first comparing unit circuit 31 is used for judging data transfer negative terminal dm
Output signal and the output voltage size of data transfer anode dp output signal, and then it is short to judge whether above-mentioned two transmission end has
Road phenomenon.
In another embodiment, when one end of step-down impedance r10 is connected with data transfer negative terminal dm, step-down impedance r10's
During other end ground connection；The positive input of first comparator 311 and the data transfer anode dp of usb charging port control chip 11
Connect, the negative input of first comparator 311 is connected with the data transfer negative terminal dm of usb charging port control chip 11.Profit
It is used for judging data transfer negative terminal dm output signal and data transfer anode dp output signal with the first comparing unit circuit 31
Output voltage size, and then judge whether above-mentioned two transmission end has short circuit phenomenon.
As shown in figure 3-2, the second comparing unit circuit 32 comprises the second comparator 321.The forward direction of the second comparator 321 is defeated
Enter end to be connected with data transfer anode dp, the negative input of the second comparator 321 obtains second threshold voltage signal v2.This reality
In new, the second comparing unit circuit 32 is used for judging output voltage and the Second Threshold of data transfer anode dp output signal
The size of voltage signal v2, and then judge whether data transfer anode dp occurs breaking phenomena.
As shown in Fig. 3-3, the 3rd comparing unit circuit 33 comprises the 3rd comparator 331.The forward direction of the 3rd comparator 331 is defeated
Enter end and obtain first threshold voltage signal v1, the negative input of the 3rd comparator 331 is connected with data transfer anode dp.This reality
In new, the 3rd comparing unit circuit 33 is used for judging output voltage and the first threshold of data transfer anode dp output signal
The size of voltage signal v1, and then judge the output voltage of data transfer anode dp output signal whether in normal voltage range
Interior.
As shown in Figure 3-4, the 4th comparing unit circuit 34 comprises the 4th comparator 341.The forward direction of the 4th comparator 341 is defeated
Enter end to be connected with data transfer negative terminal dm, the negative input of the 4th comparator 341 obtains second threshold voltage signal v2.This reality
In new, the 4th comparing unit circuit 34 is used for judging the size of data transfer negative terminal dm and second threshold voltage signal v2,
And then judge whether data transfer negative terminal dm occurs breaking phenomena.
As in Figure 3-5, the 5th comparing unit circuit 35 comprises the 5th comparator 351.The forward direction of the 5th comparator 351 is defeated
Enter end and obtain first threshold voltage signal v1, the negative input of the 5th comparator 351 is connected with data transfer negative terminal dm.This reality
In new, the 5th comparing unit circuit 35 is used for judging the size of data transfer negative terminal dm and first threshold voltage signal v1,
And then judge the output voltage of data transfer negative terminal dm output signal whether in normal voltage range.
As shown in figure 4, logic judging circuit 4 comprises: the first logic circuit, the second logic circuit, the 3rd logic circuit,
Four logic circuits and display circuit 45.The input of display circuit 45 is connected with the output end of the 4th logic circuit.
In the present embodiment, the logical AND gate integrated chip using model 74hc08 is multiple as logic judging circuit 4
Logic and operation device.
As shown in Fig. 3-2, Fig. 3-3, Fig. 4, the first logic circuit comprises the first logic and operation device 411.First logical AND
The first input end of arithmetic unit 411 is connected with output end 1a of the second comparing unit circuit 32, the first logic and operation device 411
Second input is connected with output end 1b of the 3rd comparing unit circuit 33.
As shown in Fig. 3-4, Fig. 3-5, Fig. 4, the second logic circuit comprises the second logic and operation device 421.Second logical AND
The first input end of arithmetic unit 421 is connected with output end 2a of the 4th comparing unit circuit 34, the second logic and operation device 421
Second input is connected with output end 2b of the 5th comparing unit circuit 35.
3rd logic circuit comprises the 3rd logic and operation device 431.The first input end of the 3rd logic and operation device 431 with
The output end connection of the first logic circuit 41, the second input of the 3rd logic and operation device 431 and the second logic circuit 42
Output end connects.
As shown in Fig. 3-1, Fig. 4, the 4th logic circuit comprises the 4th logic and operation device 441.4th logic and operation device
441 first input end is connected with output end 3a of the first comparing unit circuit 31, and the second of the 4th logic and operation device 441 is defeated
Enter end to be connected with the output end of the 3rd logic circuit 43.
Display circuit 45 comprises: the 5th impedance r20, the first light emitting diode d8, the 6th impedance r1 and the second light-emitting diodes
Pipe d7.Wherein, one end of the 5th impedance r20 is connected with external power source；The positive pole of the first light emitting diode d8 and the 5th impedance
The other end of r20451 connects, and the negative pole of the first light emitting diode d8 is connected with the output end of the 4th logical AND circuit；6th resistance
One end of anti-r19 is connected with the output end of the 4th logical AND circuit；The positive pole of the second light emitting diode d7 pipe and the 6th impedance r19
The other end connect, the minus earth of the second light emitting diode d7.
A kind of usb charging port control chip testing circuit disclosed in the utility model, concrete operating principle is as follows:
Through the design of above-mentioned pressure reduction output module 1, threshold generation circuits 2, comparison circuit 3 and logic judging circuit 4, when
Threshold generation circuits 2 export first threshold voltage signal v1 respectively, second threshold voltage signal v2 is to comparison circuit 3, and press
When difference output module 1 output data transmission anode dp output signal, data transfer negative terminal dm output signal to comparison circuit 3；Logical
Cross comparison circuit 3 and obtain multiple logic judgment results.
Data transfer anode dp output signal, data transfer are judged by the first comparing unit circuit 31 of comparison circuit 3
The magnitude relationship of negative terminal dm output signal.When first comparator 311 output high level signal when, illustrate data transfer anode dp,
Data transfer negative terminal dm is not all short-circuited；When first comparator 311 output low level signal, data transfer anode is described
In dp, data transfer negative terminal dm, arbitrary transmission port is short-circuited phenomenon.
Data transfer anode dp output signal and Second Threshold are judged by the second comparing unit circuit 32 of comparison circuit 3
The magnitude relationship of voltage signal v2.When the second comparator 321 output high level signal, illustrate that data transfer anode dp does not exist
Open circuit phenomenon；When the second comparator 321 output low level signal, conclusion is contrary.
Data transfer anode dp output signal and first threshold are judged by the 3rd comparing unit circuit 33 of comparison circuit 3
The magnitude relationship of voltage signal v1.When the 3rd comparator 331 output high level signal, data transfer anode dp output letter is described
Number output voltage in normal range of operation；When the 3rd comparator 331 output low level signal, conclusion is contrary.
Data transfer negative terminal dm output signal and Second Threshold are judged by the 4th comparing unit circuit 34 of comparison circuit 3
The magnitude relationship of voltage signal v2.When the 4th comparator 341 output high level signal, illustrate that data transfer negative terminal dm does not exist
Open circuit phenomenon；When the 4th comparator 341 output low level signal, conclusion is contrary.
Data transfer negative terminal dm output signal and first threshold are judged by the 5th comparing unit circuit 35 of comparison circuit 3
The magnitude relationship of voltage signal v1.When the 5th comparator 351 output high level signal, data transfer negative terminal dm output letter is described
Number output voltage in normal range of operation；When the 5th comparator 351 output low level signal, conclusion is contrary.
Comparison circuit 3 five output end signals respectively the first logic circuit of input logic decision circuitry 4, second patrol
After collecting in circuit, the 3rd logic circuit and the 4th logic circuit, when the 4th logic circuit exports high level, data transfer is described
Anode dp, data transfer negative terminal dm are not all short-circuited, and data transfer anode dp does not have open circuit phenomenon and can be just
There is not open circuit phenomenon and being capable of normal work in often work, data transfer negative terminal dm；Then the second luminous two of display circuit 45
Pole pipe d7 works, and display usb charging port control chip performance is normal.When the 4th logic circuit exports low level, number is described
According to transmission anode dp, data transfer negative terminal dm it may happen that short circuit, and/or data transfer anode dp exist open a way phenomenon and/or
Normal work, data transfer negative terminal dm can not there is open circuit phenomenon and/or can not normal work；Then the of display circuit 45
One light emitting diode d8 work, display usb charging port control chip performance is abnormal.
Although the foregoing describing specific embodiment of the present utility model, it will be appreciated by those of skill in the art that
These are merely illustrative of, and protection domain of the present utility model is defined by the appended claims.Those skilled in the art
Member, on the premise of without departing substantially from principle of the present utility model and essence, can make numerous variations or repair to these embodiments
Change, but these changes and modification each fall within protection domain of the present utility model.
Claims (10)
1. a kind of usb charging port control chip testing circuit is it is characterised in that described testing circuit comprises:
Pressure reduction output module, described pressure reduction output module is connected so that described treat with usb charging port control chip to be detected
The output signal voltage of data transfer anode of usb charging port control chip of detection and the output signal of data transfer negative terminal
Voltage has pressure reduction；
Comparison circuit, the input of described comparison circuit obtains first threshold voltage signal, second threshold voltage signal respectively, and
It is connected with the data transfer anode of described usb charging port control chip to be detected, data transfer negative terminal；Described comparison circuit
Export respectively: judge described data transfer anode and described data transfer negative terminal whether short-circuit signal, judge described data transfer
Anode whether open circuit signaling, judges described data transfer negative terminal whether open circuit signaling, judges described data transfer anode output letter
Number voltage whether signal in normal range (NR), whether the voltage judging described data transfer negative terminal output signal in normal range (NR)
Interior signal；
Logic judging circuit, obtains described judgement described data transfer anode and the institute of described comparison circuit output end output respectively
State data transfer negative terminal whether short-circuit signal, described judge described data transfer anode whether described in open circuit signaling, described judgement
Whether whether open circuit signaling, the described voltage judging described data transfer anode output signal are in normal range (NR) for data transfer negative terminal
Interior signal, the described voltage judging described data transfer negative terminal output signal whether signal in normal range (NR), and carry out logic
Judge.
2. usb charging port control chip testing circuit as claimed in claim 1 is it is characterised in that described first threshold is electric
Pressure signal, described second threshold voltage signal are all produced by threshold generation circuits, and described threshold generation circuits comprise:
Low-dropout linear voltage-regulating circuit, the input voltage of described low-dropout linear voltage-regulating circuit is charged with described usb to be detected
The input voltage of port controlling chip is identical；
First threshold voltage output circuit, the input of described first threshold voltage output circuit and described low pressure difference linearity voltage stabilizing
The output end of circuit connects, and the output end of described first threshold voltage output circuit exports described first threshold voltage signal；
Second threshold voltage output circuit, the input of described second threshold voltage output circuit and described low pressure difference linearity voltage stabilizing
The output end of circuit connects, and the output end of described second threshold voltage output circuit exports described second threshold voltage signal.
3. usb charging port control chip testing circuit as claimed in claim 2 is it is characterised in that described first threshold is electric
Voltage follower circuit comprises:
First impedance, one end of described first impedance is connected with the output end of described low-dropout linear voltage-regulating circuit；
Second impedance, one end of described second impedance is connected with the other end of described first impedance, described second impedance another
End ground connection；
The output end of described first threshold voltage output circuit is the tie point of described first impedance and described second impedance；Described
First impedance is 1: 10 with the impedance ratio of described second impedance.
4. usb charging port control chip testing circuit as claimed in claim 2 is it is characterised in that described Second Threshold is electric
Voltage follower circuit comprises:
3rd impedance, one end of described 3rd impedance is connected with the output end of described low-dropout linear voltage-regulating circuit；
4th impedance, one end of described 4th impedance is connected with the other end of described 3rd impedance, described 4th impedance another
End ground connection；
The output end of described second threshold voltage output circuit is the tie point of described 3rd impedance and described 4th impedance；Described
3rd impedance is 1: 1 with the impedance ratio of described 4th impedance.
5. usb charging port control chip testing circuit as claimed in claim 1 is it is characterised in that described pressure reduction exports mould
Block comprises: step-down impedance；One end of described step-down impedance and the data transfer of described usb charging port control chip to be detected
Anode connects, the other end ground connection of described step-down impedance.
6. usb charging port control chip testing circuit as claimed in claim 1 is it is characterised in that described pressure reduction exports mould
Block comprises: step-down impedance；One end of described step-down impedance and the data transfer of described usb charging port control chip to be detected
Negative terminal connects, the other end ground connection of described step-down impedance.
7. usb charging port control chip testing circuit as claimed in claim 5 is it is characterised in that described comparison circuit bag
Contain:
First comparing unit circuit, comprises first comparator；The positive input of described first comparator with described to be detected
The data transfer negative terminal of usb charging port control chip connects, and the negative input of described first comparator is to be detected with described
Usb charging port control chip data transfer anode connect；
Second comparing unit circuit, comprises the second comparator；The positive input of described second comparator and described data transfer
Anode connects, and the negative input of described second comparator obtains described second threshold voltage signal；
3rd comparing unit circuit, comprises the 3rd comparator；The positive input of described 3rd comparator obtains described first threshold
Threshold voltage signal, the negative input of described 3rd comparator is connected with described data transfer anode；
4th comparing unit circuit, comprises the 4th comparator；The positive input of described 4th comparator and described data transfer
Negative terminal connects, and the negative input of described 4th comparator obtains described second threshold voltage signal；
5th comparing unit circuit, comprises the 5th comparator；The positive input of described 5th comparator obtains described first threshold
Threshold voltage signal, the negative input of described 5th comparator is connected with described data transfer negative terminal.
8. usb charging port control chip testing circuit as claimed in claim 6 is it is characterised in that described comparison circuit bag
Contain:
First comparing unit circuit, comprises first comparator；The positive input of described first comparator with described to be detected
The data transfer anode of usb charging port control chip connects, and the negative input of described first comparator is to be detected with described
Usb charging port control chip data transfer negative terminal connect；
Second comparing unit circuit, comprises the second comparator；The positive input of described second comparator and described data transfer
Anode connects, and the negative input of described second comparator obtains described second threshold voltage signal；
3rd comparing unit circuit, comprises the 3rd comparator；The positive input of described 3rd comparator obtains described first threshold
Threshold voltage signal, the negative input of described 3rd comparator is connected with described data transfer anode；
4th comparing unit circuit, comprises the 4th comparator；The positive input of described 4th comparator and described data transfer
Negative terminal connects, and the negative input of described 4th comparator obtains described second threshold voltage signal；
5th comparing unit circuit, comprises the 5th comparator；The positive input of described 5th comparator obtains described first threshold
Threshold voltage signal, the negative input of described 5th comparator is connected with described data transfer negative terminal.
9. usb charging port control chip testing circuit as claimed in claim 7 or 8 is it is characterised in that described logic judgment
Circuit comprises:
First logic circuit, comprises the first logic and operation device, the first input end of described first logic and operation device with described
The output end of the second comparing unit circuit connects, and the second input of described first logic and operation device compares list with the described 3rd
The output end of first circuit connects；
Second logic circuit, comprises the second logic and operation device, the first input end of described second logic and operation device with described
The output end of the 4th comparing unit circuit connects, and the second input of described second logic and operation device compares list with the described 5th
The output end of first circuit connects；
3rd logic circuit, comprises the 3rd logic and operation device, the first input end of described 3rd logic and operation device with described
The output end connection of the first logic circuit, the second input of described 3rd logic and operation device and described second logic circuit
Output end connects；
4th logic circuit, comprises the 4th logic and operation device, the first input end of described 4th logic and operation device with described
The output end of the first comparing unit circuit connects, and the second input of described 4th logic and operation device is electric with described 3rd logic
The output end on road connects.
10. usb charging port control chip testing circuit as claimed in claim 9 is it is characterised in that described logic judgment is electric
Road also comprises display circuit, and described display circuit comprises:
5th impedance, one end of described 5th impedance is connected with external power source；
First light emitting diode, the positive pole of described first light emitting diode is connected with the other end of described 5th impedance, and described
The negative pole of one light emitting diode is connected with the output end of described 4th logical AND circuit；
6th impedance, one end of described 6th impedance is connected with the output end of described 4th logical AND circuit；
Second light emitting diode, the positive pole of described second light emitting diode pipe is connected with the other end of described 6th impedance, described
The minus earth of the second light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620841135.5U CN205910306U (en) | 2016-08-04 | 2016-08-04 | USB port control chip assay circuit that charges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620841135.5U CN205910306U (en) | 2016-08-04 | 2016-08-04 | USB port control chip assay circuit that charges |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205910306U true CN205910306U (en) | 2017-01-25 |
Family
ID=57804162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620841135.5U Withdrawn - After Issue CN205910306U (en) | 2016-08-04 | 2016-08-04 | USB port control chip assay circuit that charges |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205910306U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291320A (en) * | 2016-08-04 | 2017-01-04 | 上海贝岭股份有限公司 | A kind of USB charging port control chip testing circuit |
| CN107247179A (en) * | 2017-05-03 | 2017-10-13 | 北京世纪龙脉科技有限公司 | A kind of voltage detecting circuit of USB device |
-
2016
- 2016-08-04 CN CN201620841135.5U patent/CN205910306U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106291320A (en) * | 2016-08-04 | 2017-01-04 | 上海贝岭股份有限公司 | A kind of USB charging port control chip testing circuit |
| CN106291320B (en) * | 2016-08-04 | 2024-02-02 | 上海贝岭股份有限公司 | USB charging port control chip detection circuit |
| CN107247179A (en) * | 2017-05-03 | 2017-10-13 | 北京世纪龙脉科技有限公司 | A kind of voltage detecting circuit of USB device |
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