CN107389994A - A kind of configurable pin multiplexing method and system applied to current sensor chip - Google Patents
A kind of configurable pin multiplexing method and system applied to current sensor chip Download PDFInfo
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- CN107389994A CN107389994A CN201710626791.2A CN201710626791A CN107389994A CN 107389994 A CN107389994 A CN 107389994A CN 201710626791 A CN201710626791 A CN 201710626791A CN 107389994 A CN107389994 A CN 107389994A
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- sensor chip
- current sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
Abstract
The present invention relates to the multiplexing technology field of current sensor chip pin,A kind of specially configurable pin multiplexing method and system applied to current sensor chip,For above-mentioned the problem of can not meeting the instruction of high speed excessively stream,The invention provides a kind of configurable pin multiplexing method and system applied to current sensor chip,User can realize the pin multiplexing of current sensor chip when in use,It includes current sensor chip,It is characterized in that,The magnitude of voltage exported to the detection signal output pin of the current sensor chip is handled before output,The zero current biasing voltage signal pin of current sensor chip connects external power source by pull-up resistor or passes through capacity earth,When flowing through the controller to be measured of the current sensor chip,The magnitude of voltage curve of zero current biasing voltage signal pin output changes Indication Characteristics.
Description
Technical field
The present invention relates to the multiplexing technology field of current sensor chip pin, is specially that one kind is applied to current sensor
The configurable pin multiplexing method and system of chip.
Background technology
Current sensor chip is to utilize magnetic sensor technologies, inside induction chip（It is or outside）Electrical conductor is formed
Magnetic field flow through the chip of the amplitude of current signal and polarity on conductor to obtain.This chip is widely used in industrial control
System, household electrical appliances and other fields.Because the volume of equipment increasingly reduces, user wishes obtaining current sensor core of good performance
While piece, it is also desirable to which the area of current sensor chip and its peripheral circuit occupancy pcb board is as far as possible small.
Fig. 1 shows a kind of pin definitions and application circuit of typical current sensor chip：Wherein 100 be that electric current passes
Sensor chip；101 ~ 104 be four electric current pins, and outside electric current to be measured passes through their inflow/outflow chips.105 be chip
Ground pin, 108 be the power pin of chip；107 be the detection signal output pin of chip, and its output pin voltage is with stream
Enter chip size of current and polarity and change, and 106 be chip zero current biasing voltage signal pin, its output signal with
The magnitude of voltage of 107 pins is equal when the electric current of inflow/outflow chip is zero, i.e.,：Provide the base of a current measurement
Calibration signal.Above pin definitions and application circuit provide basic current sense function.
In addition to providing basic current sense function, in the application with power semiconductor, user wishes to
It is enough to provide excessively stream indication signal after electric current to be measured exceedes certain limit, so as to turn off semiconductor devices in time, avoid its
Damage in the case of high current, the protection response time needed for typical power semiconductor are not more than 3 microseconds.
With reference to figure 2, wherein 202 be measured signal pin（107 pins of corresponding diagram 1）, 203 be zero current bias voltage letter
Number pin（106 pins of corresponding diagram 1）.Fig. 3 is when flowing through chip curent change to be measured, and the signal of 202 pins and 203 pins becomes
Change situation, its cathetus 301 are the voltage signal changes of 202 pins output, and dotted line 302 is the voltage signal of 203 pins output
Change.It can be seen that the voltage of 202 pins is with the current polarity and size variation for flowing through conductor, and the voltage of 203 pins is not then with stream
Curent change to be measured through chip conductors and change, its magnitude of voltage and the measured signal pipe when flowing through the electric currents of chip conductors and being zero
Pin（That is 202 pins）Magnitude of voltage it is equal.In Fig. 3, current value 303 and current value 304 are needing to power of being mentioned above
The current threshold that semiconductor devices is protected, and magnitude of voltage 305 and magnitude of voltage 306 are then signal output pins in current threshold
Under the conditions of output voltage threshold signal.
As it is desirable that unnecessary noise signal can be filtered out, current sensor chip generally all can be in signal output part
（202 pins in Fig. 2）Ensure good noise characteristic using low pass filter 201 before, but low pass filter can reduce
The speed of transient response.Under the conditions of usual acceptable noise characteristic, the transient response speed of signal output part is typically big
In 5 ~ 10 microseconds.Because excessively stream indication signal is also a kind of transient response, so the signal output part letter with low pass filter
Number it is difficult to meet the requirement that high speed excessively stream indication signal is provided.The i.e. existing each pin of current sensor chip is only single
It function, can not be multiplexed between pin, when user needs to realize more multi-functional, number of pins can be increased, so as to increase chip cost
And its occupied area on circuit boards.
The content of the invention
For above-mentioned the problem of can not meeting the instruction of high speed excessively stream, the invention provides one kind to be applied to current sensor core
The configurable pin multiplexing method and system of piece, user can realize the pin multiplexing of current sensor chip when in use.
Its technical scheme is such：A kind of configurable pin multiplexing method applied to current sensor chip, it is wrapped
Include current sensor chip, it is characterised in that the voltage exported to the detection signal output pin of the current sensor chip
Value is handled before output, and the zero current biasing voltage signal pin of current sensor chip connects outside by pull-up resistor
Power supply passes through capacity earth, when flowing through the controller to be measured of the current sensor chip, zero current biased electrical
The magnitude of voltage curve of signal pin output is pressed to change Indication Characteristics.
It is further characterized by, when flowing through the controller to be measured of the current sensor chip, the electricity
The zero current biasing voltage signal pin of flow sensor chip will export the indication signal of controller to be measured.
A kind of configurable pin system applied to current sensor chip, it includes current sensor chip, the electricity
Measured signal output module and low pass filter are provided with flow sensor chip, it is characterised in that the current sensor
Voltage processing module is additionally provided with chip, the output end connection low pass filter of the measured signal output module
One input of input and the voltage processing module, the output end of the low pass filter export for the detection signal
Pin, the output end of the voltage processing module are zero current bias voltage pin, the measured signal output module it is another
Individual output end connects another input of the voltage processing module, and the output end of the voltage processing module is described zero electricity
Biasing voltage signal pin is flowed, the voltage processing module includes three comparators, the output end of comparator described in two of which
The input of the input OR gate of connection two, the output end of the two inputs OR gate connect the Enable Pin of latch, connected by switching
The input of MUX, the output end of another comparator connect the input of the latch, the latch it is defeated
Go out the control terminal that end connects the MUX, the output end of the MUX is the output of the voltage processing module
End, when flowing through the controller of the current sensor chip, the zero current biased electrical of the current sensor chip
Signal pin output current is pressed to exceed the indication signal of threshold value；The zero current biasing voltage signal pin is connected by pull-up resistor
Connect external power source or pass through capacity earth.
It is further characterized by, and the comparator is the high-speed comparator with hysteresis characteristic.
After method and system using the present invention, voltage processing module is added, when flowing through the current sensor chip
Controller to be measured when, zero current biasing voltage signal pin output magnitude of voltage curve change Indication Characteristics, so as to
The curve of two kinds of different qualities can be exported by realizing a pin, realize the pin multiplexing of current sensor chip.
Brief description of the drawings
Fig. 1 is chip structure schematic diagram in the prior art；
Fig. 2 is chip internal measured signal output module schematic diagram in the prior art；
Fig. 3 is to flow through chip current and voltage change schematic diagram in the prior art；
Fig. 4 is circuit theory diagrams of the present invention；
Fig. 5 is electric current corresponding to the present invention and voltage change schematic diagram（Band hysteresis characteristic）.
Embodiment
See Fig. 4, a kind of configurable pin system applied to current sensor chip shown in Fig. 5, it includes current sense
Device chip, the interior of current sensor chip are provided with measured signal output module 500 and low pass filter 501, current sensor
Voltage processing module 504, the output end connection low pass filter of measured signal output module 500 are additionally provided with chip
501 input and an input of voltage processing module 504, the output end of low pass filter 500 export for detection signal
Pin 502, another input of another output end connection voltage processing module 504 of measured signal output module 500, electricity
The output end for pressing processing module 504 is zero current biasing voltage signal pin 504, and voltage processing module 504 includes three comparisons
Device 504D, 504F, 504J, wherein comparator 504D, 540J the input OR gate 504H of output end connection two input, comparator
504D input input presses signal 505 and forward current threshold voltage 504A, comparator without low pass filter electricity
504J input input presses signal 505 and negative current threshold voltage 504B without low pass filter electricity, two inputs or
Door 504H output end connection latch 504G Enable Pin En, the input S2 by switching K connection MUXs 504E,
Comparator 504F output end connection latch 504G input D, latch 504G output end connection MUX
504E control terminal, zero current biasing voltage signal 506 input MUX 504E input S1, MUX 504E
Output end handle mould, 504 output end, as zero current bias voltage pin 503, when flowing through current sensor core for voltage
During the controller of piece, the output current of zero current biasing voltage signal pin 503 of current sensor chip exceedes threshold value
Indication signal, the curve 402 shown in Fig. 5, straight line 401 for 502 pins voltage with the current polarity for flowing through conductor and big
Small change, 503,504 be current threshold, is the output voltage threshold signal under the conditions of current threshold corresponding to 505 and 506.By
It is the high-speed comparator with hysteresis characteristic in comparator 504D, 504F, 504J, therefore hysteresis characteristic is carried in Fig. 5.
Zero current biasing voltage signal pin 503 connects external power source by pull-up resistor 507 or connect by electric capacity 508
Ground.When by the way of " weak pull-up ", i.e., being connected pin 503 with external power source using a larger resistance 507.504F is one
The individual comparator with hysteresis characteristic, 504C are a fixed voltage value between zero current bias voltage and supply voltage.
504G is a D-latch for carrying negative sense Enable Pin.Under this connected mode, 503 port voltages close to supply voltage, so as to
504F output is low, causes 504H output end to be connected with MUX 504E input S2, when the amplitude of voltage 505
During more than or less than voltage 504A or 504B（504A is forward current threshold voltage, equivalent to the 404 of Fig. 4；504B is negative sense electricity
Threshold voltage is flowed, equivalent to the 403 of Fig. 4）, MUX 504E output is low level.Due to enabling for latch 504G
End is locked by comparator 504H output, so the low level can continue to keep, until the amplitude of voltage 505 comes back to electricity
Between pressure 504A and 504B；It is described above under this configuration, 503 output be quick excessively stream indication signal.Make when using electric capacity
For load over the ground, it is connected with pin 503.Under this external circuit arrangement, the output stable state of pin 503 will be certain to less than electricity
504C is pressed, so MUX 504E output will be equal to S1 inputs, i.e. voltage 506.So that under this configuration, pin
503 outputs are zero current bias voltage
Due to voltage signal 505 be without the high speed signal of low pass filter 501, and 504D and 504J be high ratio compared with
Device, it is ensured that the transient response speed for the excessively stream indication signal that pin 503 exports can substantially exceed pin 502, so as to shape
Indicated into quick overcurrent protection；, can be in multichannel in practical application in order to avoid electricity is unnecessary intermediateness on chip
Selector 504H output ends increase " weak pull-down " resistance.
Claims (4)
1. a kind of configurable pin multiplexing method applied to current sensor chip, it includes current sensor chip, and it is special
Sign is that the magnitude of voltage exported to the detection signal output pin of the current sensor chip is handled before output, electricity
The zero current biasing voltage signal pin of flow sensor chip connects external power source or by capacity earth by pull-up resistor, when
When flowing through the controller to be measured of the current sensor chip, the magnitude of voltage of zero current biasing voltage signal pin output
Curve changes Indication Characteristics.
2. a kind of configurable pin multiplexing method applied to current sensor chip according to claim 1, its feature
It is, when flowing through the controller to be measured of the current sensor chip, the zero current of the current sensor chip
Biasing voltage signal pin will export the indication signal of controller to be measured.
3. a kind of configurable pin system applied to current sensor chip, it includes current sensor chip, the electric current
Measured signal output module and low pass filter are provided with sensor chip, it is characterised in that the current sensor core
Voltage processing module is additionally provided with piece, an output end of the measured signal output module connects the defeated of low pass filter
Enter an input of end and the voltage processing module, the output end of the low pass filter is the detection signal efferent duct
Pin, the output end of the voltage processing module are zero current bias voltage pin, the measured signal output module another
Output end connects another input of the voltage processing module, and the output end of the voltage processing module is the zero current
Biasing voltage signal pin, the voltage processing module include three comparators, and the output end of comparator described in two of which connects
Connect the input of two input OR gates, it is the Enable Pin of the output ends connection latch of the two inputs OR gate, more by switching connection
The input of road selector, the output end of another comparator connect the input of the latch, the output of the latch
End connects the control terminal of the MUX, and the output end of the MUX is the output of the voltage processing module
End, when flowing through the controller of the current sensor chip, the zero current biased electrical of the current sensor chip
Signal pin output current is pressed to exceed the indication signal of threshold value；The zero current biasing voltage signal pin is connected by pull-up resistor
Connect external power source or pass through capacity earth.
A kind of 4. configurable pin system applied to current sensor chip according to claim 3, it is characterised in that
The comparator is the high-speed comparator with hysteresis characteristic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201710626791.2A CN107389994B (en) | 2017-07-28 | 2017-07-28 | Configurable pin multiplexing method and system applied to current sensor chip |
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| CN201710626791.2A CN107389994B (en) | 2017-07-28 | 2017-07-28 | Configurable pin multiplexing method and system applied to current sensor chip |
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| CN107389994A true CN107389994A (en) | 2017-11-24 |
| CN107389994B CN107389994B (en) | 2023-08-22 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107992143A (en) * | 2018-01-23 | 2018-05-04 | 徐工集团工程机械有限公司 | Multiplexing collection port circuit, controller, analog input acquisition method and system |
| CN108444515A (en) * | 2018-03-14 | 2018-08-24 | 无锡思泰迪半导体有限公司 | It is a kind of to cross threshold detection circuit applied to the quick of switch modulation signal |
| CN108562784A (en) * | 2018-03-14 | 2018-09-21 | 无锡思泰迪半导体有限公司 | A kind of quick over-current detection circuit applied to magnetic current sensors |
| CN113419124A (en) * | 2021-06-10 | 2021-09-21 | 西安微电子技术研究所 | Static total dose test method and system for satellite-borne microsystem module |
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| CN107992143A (en) * | 2018-01-23 | 2018-05-04 | 徐工集团工程机械有限公司 | Multiplexing collection port circuit, controller, analog input acquisition method and system |
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| CN108444515A (en) * | 2018-03-14 | 2018-08-24 | 无锡思泰迪半导体有限公司 | It is a kind of to cross threshold detection circuit applied to the quick of switch modulation signal |
| CN108562784A (en) * | 2018-03-14 | 2018-09-21 | 无锡思泰迪半导体有限公司 | A kind of quick over-current detection circuit applied to magnetic current sensors |
| CN108562784B (en) * | 2018-03-14 | 2024-03-29 | 杭州思泰微电子有限公司 | Quick overcurrent detection circuit applied to magnetic current sensor |
| CN113419124A (en) * | 2021-06-10 | 2021-09-21 | 西安微电子技术研究所 | Static total dose test method and system for satellite-borne microsystem module |
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| CN107389994B (en) | 2023-08-22 |
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Effective date of registration: 20221219 Address after: No. 295, Building 17, No. 2723, Fuchunwan Avenue, Chunjiang Street, Fuyang District, Hangzhou, Zhejiang, 310000 Applicant after: Hangzhou Sitai Microelectronics Co.,Ltd. Address before: 214028 No.16 Changjiang Road, Xinwu District, Wuxi City, Jiangsu Province Applicant before: STEADICHIPS Inc. |
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