CN106209066A - A kind of method of multiplexing chip pins and chip - Google Patents
A kind of method of multiplexing chip pins and chip Download PDFInfo
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- CN106209066A CN106209066A CN201610682792.4A CN201610682792A CN106209066A CN 106209066 A CN106209066 A CN 106209066A CN 201610682792 A CN201610682792 A CN 201610682792A CN 106209066 A CN106209066 A CN 106209066A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K19/00—Logic circuits, i.e. having at least two inputs acting on one output; Inverting circuits
- H03K19/0175—Coupling arrangements; Interface arrangements
- H03K19/017509—Interface arrangements
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Abstract
The invention discloses method and the chip of a kind of multiplexing chip pins, it makes arbitrary pin of chip by an off chip resistor ground connection, when chip starts, control this pin voltage to be fixed voltage or arrange fixed current and flow to this pin, flow through the electric current of this pin or this pin voltage by collection and it is changed, and then the output signal being converted to is latched；Making under different off chip resistors, output signal has multichannel or various ways, thus arranges the multiple duty of chip based on output signal.The present invention, in the case of not increasing chip pin, utilizes existing driving pin to arrange the duty of chip by peripheral resistance, and the use making chip is convenient flexibly, and reduces production and use cost.
Description
Technical field
The invention belongs to circuit chip design technical field, be specifically related to method and the chip of a kind of multiplexing chip pins.
Background technology
At present, the test of IC chip is generally carried out after throwing sheet is out.Highly integrated property, Gao Fu due to chip
Polygamy, not only needs to test the output signal of chip, in addition it is also necessary to test respective inner function signal, so the measurability of chip is very
Important.In traditional test, generally increase test PAD at chip internal or increase the pin of chip, being used for detecting inside
The correctness of function signal.
For same type of chip, it is often necessary to the parameter of regulation chip, the different operating state of chip is set.Ratio
As, the reference voltage of some chips is 600mV, and the reference voltage with a series of another kind of chip is 1.2V, and other aspects
Performance parameter be just as.It is generally required to produce two kinds of different chips for two kinds of different occasions.Make for convenience
With, reducing cost, some chip additionally increases by one and arranges pin, by arranging pin, can arrange chip operation in difference
State.Producing different chips, production cost necessarily improves；But chip additionally increases by one arranges pin, the area of chip
Can increase more, and packaging cost increases, system cost also can increase therewith.
Along with the development of integrated circuit, do not require nothing more than IC chip and can have measurability, also require testing scheme
Saving chip area as far as possible, to save chip cost, thus improve product profit, the most also requiring can be for throwing sheet chip out
Carry out debugging and secondary throwing sheet offer convenience；Therefore this becomes the applicant and is devoted to the direction of research.
Summary of the invention
Based on above-mentioned, the invention provides method and the chip of a kind of multiplexing chip pins, do not increase chip pin
In the case of, utilize existing pin that the duty of chip is set by peripheral resistance, the use making chip is convenient flexibly,
And reduce production and use cost.
A kind of method of multiplexing chip pins, first makes arbitrary pin of chip pass through an off chip resistor ground connection, at chip
During startup, control this pin voltage and be fixed voltage or fixed current is set flows to this pin, flow through this pin by collection
It is also changed, and then latch the output signal being converted to by electric current or this pin voltage；Make at different sheets
Under external resistance, the duty of chip is set according to described output signal.
Further, in the case of control pin voltage is fixed voltage, then gathers and flow through the electric current of this pin and to it
Change；When arranging in the case of fixed current flows to pin, then gather this pin voltage and it is changed.
Further, after latch completes, then the fixed voltage cancelling this pin controls or fixed current setting, so as not to right
External device on this pin impacts.
The chip of a kind of pin multiplexing includes pin multiplexing circuit；For arbitrary pin of this chip, described pin is multiple
Connect altogether with this pin and an off chip resistor with circuit, the other end of off chip resistor then ground connection；Described pin multiplexing circuit bag
Include a switch, pin control module, signals collecting modular converter and latch module；Wherein:
Described pin control module is connected with this pin by switch, be used for controlling this pin voltage be fixed voltage or
Fixed current is set and flows to this pin；
Described signals collecting modular converter is for gathering the electric current or this pin voltage flowing through this pin and carrying out it
Conversion, thus produce the output signal of multichannel or various ways；
Described latch module is for latching described output signal；
Described switch turns on when chip starts, and disconnects after latch module completes to latch.
Further, when pin control module is used for controlling in the case of pin voltage is fixed voltage, and signals collecting is changed
Module then flows through the electric current of this pin for collection and changes it；When pin control module is used for arranging fixed current stream
In the case of pin, signals collecting modular converter is then used for gathering this pin voltage and changing it.
Further, when pin control module is used for controlling in the case of pin voltage is fixed voltage, then it uses a fortune
Calculating amplifier, the in-phase input end of this operational amplifier connects described fixed voltage, the inverting input of operational amplifier and defeated
Going out end connect altogether and be connected with one end of switch, the other end of switch is connected with this pin.
Further, when pin control module is used for arranging in the case of fixed current flows to pin, then it uses an electric current
Source, the size of current that this current source is exported is equal to described fixed current, and its input terminates supply voltage, outfan and switch
One end be connected, the other end of switch is connected with this pin.
Further, described signals collecting modular converter uses A/D change-over circuit, and this A/D change-over circuit has N position and turns
Changing function, its input collection flows through electric current or the pin voltage of pin, and outfan produces 2NThe output signal on road, N is more than 0
Natural number.
Further, flow through the electric current of pin when signals collecting modular converter for gathering and it is carried out change over condition
Under, then it is made up of a fixed current source and a controlled current source, and the size of current that controlled current source is exported is controlled by and flows through
The electric current of this pin, its input termination supply voltage, outfan is connected with the input in fixed current source and defeated described in producing
Go out signal；The size of current that fixed current source is exported is fixed, its output head grounding.
Further, described latch module uses d type flip flop or multichannel latch.
Described pin is that switching tube drives pin.
A kind of on-off circuit, including switching tube and control chip thereof, this control chip uses the chip of above-mentioned pin multiplexing.
Based on technique scheme, the present invention, in the case of not increasing chip pin, utilizes existing driving pin to lead to
Crossing peripheral resistance and arrange the duty of chip, the use making chip is convenient flexibly, and reduces production and use into
This.
Accompanying drawing explanation
Fig. 1 is the first embodiment structural representation of pin multiplexing chip of the present invention.
Fig. 2 is the second embodiment structural representation of pin multiplexing chip of the present invention.
Fig. 3 is the third embodiment structural representation of pin multiplexing chip of the present invention.
Detailed description of the invention
In order to more specifically describe the present invention, below in conjunction with the accompanying drawings and detailed description of the invention is to technical scheme
It is described in detail.
Embodiment 1
As it is shown in figure 1, the chip of present embodiment pin multiplexing includes pin multiplexing circuit and controls drive circuit U00；
Pin multiplexing circuit connects altogether with controlling drive circuit U00 driving pin GATE and an off chip resistor R10 with this chip, off-chip
The other end of resistance R10 then ground connection；Control drive circuit U00 to carry for the switching tube M00 by driving pin GATE to be off-chip
For switch controlling signal, pin GATE is driven also to be connected with the grid of switching tube M00 and a piece of outer electric capacity C00, wherein, C00
Can be additional electric capacity, it is also possible to be the parasitic capacitance of switching tube M00；The source electrode of switching tube M00 and off-chip electric capacity C00's is another
The equal ground connection in one end.
Pin multiplexing circuit in present embodiment includes switching K10, operational amplifier U10, controlled current source I11, consolidating
Constant current source I12 and d type flip flop U11；Wherein: the in-phase input end of operational amplifier U10 meets fixed voltage VREF, computing is put
The big inverting input of device U10 is connected with one end of outfan with switch K10, therefore the output voltage of operational amplifier U10 is also
VREF, the other end of switch K10 is connected with driving pin GATE；The input termination supply voltage VD of controlled current source I11, controls
End gathers pin multiplexing circuit to the electric current i10 driving pin GATE to flow out, the input of outfan and fixed current source I12 with
And the input of d type flip flop U11 is connected, the output head grounding of fixed current source I12, the clock end CLK of d type flip flop U11 receives
Pulse signal.
On startup, switch K10 conducting, control drive circuit U00 not switch tube M00 and carry out pulling up or drop-down, then
Driving the voltage on pin GATE is VREF, the fixed voltage VREF threshold voltage less than switching tube M00, it is ensured that switching tube M00
It is off state.For ensureing that, when powering down chips, the grid of switching tube M00 is dragged down by resistance, can drive pin GATE with
Add a piece of internal resistance R00 between ground, so that it is guaranteed that switching tube M00 is off state, make security of system reliable.Due at this
In embodiment, driving pin GATE to add off chip resistor R10 between ground, therefore sheet internal resistance R00 can add and can be not added with.
When adding sheet internal resistance R00, pin multiplexing circuit to the electric current i10 size driving pin GATE to flow out is
VREF/(R10+R00).Wherein, owing to each chip of size of sheet internal resistance R00 is fixing, the therefore size of electric current i10
Only relevant with off chip resistor R10.When not adding sheet internal resistance R00, i10=VREF/R10.
Controlled current source I11 and fixed current source I12 series connection, wherein, controlled current source I11 is the electric current that electric current controls
Source, its output size of current is controlled by electric current i10, and fixed current source I12 is fixed current output.When controlled current source I11's
When output electric current is more than fixed current source I12, then the junction point voltage V1 of controlled current source I11 and fixed current source I12 is subject to
Control current source I11 pull-up, i.e. voltage V1 is high；When the output electric current of controlled current source I11 is less than fixed current source I12, then
The junction point voltage V1 of controlled current source I11 and fixed current source I12 is drop-down by fixed current source I12, i.e. voltage V1 is low.Electricity
Pressure V1 is connected to the digital input end D of d type flip flop.Drive pin GATE voltage stabilization after VREF, then voltage V1 is also stabilized in
High level or low level.Pulse signal is input to the clock end CLK of d type flip flop, then the outfan OUT of d type flip flop latches output
Digital input end voltage when CLK is high.After d type flip flop has latched, switch K10 disconnects, and pin multiplexing circuit is not to switch
Pipe M00 produces impact, completes the setting of circuit.
The outfan OUT of d type flip flop keeps latching high level or low level voltage, can arrange chip two kinds work shape
State.After chip is provided with, controls drive circuit U00 and control the switch motion of switching tube M00.
What present embodiment was given is the method to set up of two kinds of duties, Zai Jia mono-road controlled current source, fixed current
Source and d type flip flop, then can arrange four kinds of duties, by that analogy.
Embodiment 2
As in figure 2 it is shown, the chip of present embodiment pin multiplexing includes pin multiplexing circuit and controls drive circuit U00；
Pin multiplexing circuit connects altogether with controlling drive circuit U00 driving pin GATE and an off chip resistor R10 with this chip, off-chip
The other end of resistance R10 then ground connection；Control drive circuit U00 to carry for the switching tube M00 by driving pin GATE to be off-chip
For switch controlling signal, pin GATE is driven also to be connected with the grid of switching tube M00 and a piece of outer electric capacity C00, switching tube M00
Source electrode and the equal ground connection of the other end of off-chip electric capacity C00.
Pin multiplexing circuit in present embodiment include switch K10, operational amplifier U10, A/D change-over circuit U20 with
And latch U21；Wherein: the in-phase input end of operational amplifier U10 meets fixed voltage VREF, operational amplifier U10's is anti-phase
Input is connected with one end of outfan with switch K10, therefore the output voltage of operational amplifier U10 is also VREF, switch K10's
The other end is connected with driving pin GATE；The input of A/D change-over circuit U20 is connected to gather pin with driving pin GATE
Multiplex circuit is to the electric current i10 driving pin GATE to flow out, and outfan is connected with the input of latch U21, latch U21's
Clock end CLK return pulse signal.
On startup, switch K10 conducting, control drive circuit U00 not switch tube M00 and carry out pulling up or drop-down, then
Driving the voltage on pin GATE is VREF, the fixed voltage VREF threshold voltage less than switching tube M00, it is ensured that switching tube M00
It is off state；Pin multiplexing circuit is VREF/R10 to the electric current i10 size driving pin GATE to flow out.
Sampling obtains electric current i10, enters A/D change-over circuit U20, the current signal of simulation is converted into digital signal.A/D
The digital input end D that change-over circuit U20 outputs it with latch U21 is connected.Drive pin GATE voltage stabilization after VREF,
Then the size of electric current i10 is also stable.Pulse signal is input to the clock end CLK of latch U21, the then outfan of latch U21
OUT latches digital input end voltage when output CLK is high.After latch U21 has latched, switch K10 disconnects, pin multiplexing
Circuit not switch tube M00 produces impact, completes the setting of chip.Wherein, A/D change-over circuit U20 can be N position conversion electricity
Road, then its output signal has 2NRoad, then input and the output of latch U21 is respectively arranged with 2NRoad signal, can arrange 2NPlant work shape
State.
Embodiment 3
As it is shown on figure 3, the chip of present embodiment pin multiplexing includes pin multiplexing circuit and controls drive circuit U00；
Pin multiplexing circuit connects altogether with controlling drive circuit U00 driving pin GATE and an off chip resistor R10 with this chip, off-chip
The other end of resistance R10 then ground connection；Control drive circuit U00 to carry for the switching tube M00 by driving pin GATE to be off-chip
For switch controlling signal, pin GATE is driven also to be connected with the grid of switching tube M00 and a piece of outer electric capacity C00, switching tube M00
Source electrode and the equal ground connection of the other end of off-chip electric capacity C00.
Pin multiplexing circuit in present embodiment includes that switch K10, fixed current source I30, clamp circuit U30, A/D turn
Change circuit U 20 and latch U21；Wherein: the input of fixed current source I30 termination supply voltage VD, outfan with switch
One end of K10 is connected, and the other end of switch K10 is connected with driving pin GATE；Clamp circuit U30 is connected to fixed current source
Between I30 outfan and ground, the input of A/D change-over circuit U20 is connected to gather with the outfan of fixed current source I30 and drives
The voltage of dynamic pin GATE, outfan is connected with the input of latch U21, and the clock end CLK of latch U21 receives pulse letter
Number.
On startup, switch K10 conducting, control drive circuit U00 not switch tube M00 and carry out pulling up or drop-down, Gu
The electric current i30 that constant current source I30 is exported fixes, and driving the voltage on pin GATE is i30*R10；Electric current i30 is from fixing electricity
The outfan of stream source I30 flows to drive pin GATE, clamp circuit U30 in parallel with driving pin GATE through switch K10, its pincers
The position voltage turn-on threshold voltage less than switching tube M00, prevents in chip operation state setting up procedure, and switching tube M00 misleads
Logical.Off chip resistor R10 can not be excessive, otherwise the i30*R10 clamp voltage more than clamp circuit U30, then clamp circuit U30 will drive
Dynamic pin GATE voltage clamp.
Sampling obtains driving pin GATE voltage, enters A/D change-over circuit U20, the voltage signal of simulation is converted into number
Word signal.The digital input end D that A/D change-over circuit U20 outputs it with latch U21 is connected.Drive pin GATE voltage steady
After Ding, pulse signal is input to the clock end CLK of latch U21, then the outfan OUT of latch U21 latches output CLK is high
Time digital input end voltage.After latch U21 has latched, switch K10 disconnects, pin multiplexing circuit not switch tube M00
Produce impact, complete the setting of chip.Wherein, A/D change-over circuit U20 can be N position change-over circuit, then its output signal has 2N
Road, then input and the output of latch U21 is respectively arranged with 2NRoad signal, can arrange 2NPlant duty.
The above-mentioned description to embodiment is to be understood that for ease of those skilled in the art and apply the present invention.
Above-described embodiment obviously easily can be made various amendment by person skilled in the art, and described herein typically
Principle is applied in other embodiments without through performing creative labour.Therefore, the invention is not restricted to above-described embodiment, ability
Field technique personnel should be in protection scope of the present invention according to the announcement of the present invention, the improvement made for the present invention and amendment
Within.
Claims (12)
1. the method for a multiplexing chip pins, it is characterised in that: first make arbitrary pin of chip be connect by an off chip resistor
Ground, when chip starts, is controlled this pin voltage and is fixed voltage or arranges fixed current and flow to this pin, flowed through by collection
It is also changed, and then latch the output signal being converted to by the electric current of this pin or this pin voltage；Make
Under different off chip resistors, the duty of chip is set according to described output signal.
Method the most according to claim 1, it is characterised in that: in the case of control pin voltage is fixed voltage, then adopt
Collection flows through the electric current of this pin and changes it；When arranging in the case of fixed current flows to pin, then gather this pin electricity
It is also changed by pressure.
Method the most according to claim 1, it is characterised in that: after latch completes, then cancel the fixed voltage of this pin
Control or fixed current is arranged.
4. the chip of a pin multiplexing, it is characterised in that: include pin multiplexing circuit；For arbitrary pin of this chip, institute
The pin multiplexing circuit stated connects altogether with this pin and an off chip resistor, the other end of off chip resistor then ground connection；Described pin
Multiplex circuit includes a switch, pin control module, signals collecting modular converter and latch module；Wherein:
Described pin control module is connected with this pin by switch, and being used for controlling this pin voltage is fixed voltage or setting
Fixed current flows to this pin；
Described signals collecting modular converter flows through the electric current of this pin or this pin voltage for gathering and changes it,
Thus produce the output signal of multichannel or various ways；
Described latch module is for latching described output signal；
Described switch turns on when chip starts, and disconnects after latch module completes to latch.
Chip the most according to claim 4, it is characterised in that: it is used for controlling pin voltage being fixing when pin control module
Under voltage condition, signals collecting modular converter then flows through the electric current of this pin for collection and changes it；When pin control
Molding block is used for arranging in the case of fixed current flows to pin, and signals collecting modular converter is then used for gathering this pin voltage right
It is changed.
6. according to the chip described in claim 4 or 5, it is characterised in that: when pin control module be used for controlling pin voltage be
In the case of fixed voltage, then it uses an operational amplifier, and the in-phase input end of this operational amplifier connects described fixed voltage,
The inverting input of operational amplifier connects altogether with outfan and is connected with one end of switch, the other end of switch and this pin phase
Even.
7. according to the chip described in claim 4 or 5, it is characterised in that: when pin control module is used for arranging fixed current stream
In the case of pin, then it uses a current source, and the size of current that this current source is exported is equal to described fixed current, and it is defeated
Entering termination power voltage, outfan is connected with one end of switch, and the other end of switch is connected with this pin.
Chip the most according to claim 4, it is characterised in that: described signals collecting modular converter uses A/D conversion electricity
Road, this A/D change-over circuit has N position translation function, and its input collection flows through electric current or the pin voltage of pin, and outfan produces
Raw 2NThe output signal on road, N is the natural number more than 0.
9. according to the chip described in claim 4 or 5, it is characterised in that: when signals collecting modular converter flows through draw for collection
It is also carried out under change over condition by the electric current of foot, then it is made up of a fixed current source and a controlled current source, controlled current source
The size of current exported is controlled by the electric current flowing through this pin, its input termination supply voltage, outfan and fixed current source
Input be connected and output signal described in producing；The size of current that fixed current source is exported is fixed, its output head grounding.
Chip the most according to claim 4, it is characterised in that: described latch module uses d type flip flop or multichannel to latch
Device.
11. chips according to claim 4, it is characterised in that: described pin is that switching tube drives pin.
12. 1 kinds of on-off circuits, including switching tube and control chip thereof, it is characterised in that: described control chip uses such as power
Profit requires the chip described in 4～11 any claim.
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|---|---|---|---|
| CN201610682792.4A CN106209066B (en) | 2016-08-17 | 2016-08-17 | Chip pin multiplexing method and chip |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610682792.4A CN106209066B (en) | 2016-08-17 | 2016-08-17 | Chip pin multiplexing method and chip |
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| CN109782660A (en) * | 2018-12-28 | 2019-05-21 | 深圳市优必选科技有限公司 | A kind of control circuit and device of compatible voltage-type and current mode analog input |
| CN109921780A (en) * | 2019-03-07 | 2019-06-21 | 上海申矽凌微电子科技有限公司 | Multiplexing pins circuit |
| CN111289885A (en) * | 2020-03-06 | 2020-06-16 | 湖南国科微电子股份有限公司 | Debugging system and method for power-on and power-off of chip |
| CN111474407A (en) * | 2020-06-29 | 2020-07-31 | 上海海栎创微电子有限公司 | Mode selection device with voltage detection priority |
| WO2023024694A1 (en) * | 2021-08-24 | 2023-03-02 | 深圳英集芯科技股份有限公司 | Chip testing and pin reuse unit, and chip testing and pin reuse method |
| CN116165510A (en) * | 2022-12-29 | 2023-05-26 | 无锡晟朗微电子有限公司 | Communication device for chip test |
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Address after: Room 901-23, 9 / F, west 4 building, Xigang development center, 298 Zhenhua Road, Sandun Town, Xihu District, Hangzhou City, Zhejiang Province, 310030 Applicant after: Jiehuate Microelectronics Co.,Ltd. Address before: Room 424, building 1, 1500 Wenyi West Road, Cangqian street, Yuhang District, Hangzhou City, Zhejiang Province Applicant before: JOULWATT TECHNOLOGY Inc.,Ltd. |
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