CN108051649A - A kind of detection circuit and its detection method of exterior arrangement resistance - Google Patents
A kind of detection circuit and its detection method of exterior arrangement resistance Download PDFInfo
- Publication number
- CN108051649A CN108051649A CN201711418361.8A CN201711418361A CN108051649A CN 108051649 A CN108051649 A CN 108051649A CN 201711418361 A CN201711418361 A CN 201711418361A CN 108051649 A CN108051649 A CN 108051649A
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- comparator
- resistance
- rexternal
- oxide
- metal
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/08—Measuring resistance by measuring both voltage and current
Abstract
The invention discloses a kind of detection circuit of exterior arrangement resistance, including several metal-oxide-semiconductors, several switch, current source I0, non-essential resistance Rexternal, comparator comparator；The current source I0 connects the drain electrode of the first metal-oxide-semiconductor T1 and the grid of several other metal-oxide-semiconductors respectively；The source electrode of first metal-oxide-semiconductor T1 connects the grid of several other metal-oxide-semiconductors respectively；The drain electrode of several metal-oxide-semiconductors in addition to the first metal-oxide-semiconductor T1 passes through the in-phase end of several switch connections non-essential resistance Rexternal and comparator comparator respectively；The other end connection ground of non-essential resistance Rexternal；Power supply Vref is depended merely in the end of oppisite phase connection of comparator comparator.The present invention can realize the resolution of reliable more resistance value gear under limited supply voltage scope.
Description
Technical field
The present invention relates to circuit externals to configure resistance, and in particular to a kind of detection circuit of exterior arrangement resistance and detection side
Method.
Background technology
At present, many circuits realize different circuit configurations by the difference of external connection resistance value.Such as the frequency that works
Rate, operating mode etc..When needing more different configurations, on the basis of adhering to reliably differentiating, more resistance value gear point
Distinguish that with limited supply voltage scope be conflict.
There are two types of methods for the detection of general non-essential resistance resistance value gear：
Method one, chip pin is arranged to fixed voltage value output, when non-essential resistance is connected on the pin, on the resistance
The electric current of a reflection external resistance is flowed through, by the gear for judging the current value, you can judge the outer connecting resistance resistance
The gear of value.
Method two, chip pin is arranged to fixed current output, when non-essential resistance is connected on the pin, in the pin
On obtain the voltage for reflecting the external resistance, judge the gear of the voltage value, you can judge outer connecting resistance resistance
The gear of value.
The content of the invention
The present invention is in view of the above-mentioned problems, provide a kind of detection circuit and detection method of exterior arrangement resistance.
The technical solution adopted by the present invention is：A kind of detection circuit of exterior arrangement resistance, if including several metal-oxide-semiconductors,
Dry switch, current source I0, non-essential resistance Rexternal, comparator comparator；The current source I0 connects first respectively
The drain electrode of metal-oxide-semiconductor T1 and the grid of several other metal-oxide-semiconductors；The source electrode of first metal-oxide-semiconductor T1 connects other several respectively
The grid of a metal-oxide-semiconductor；The drain electrode of several metal-oxide-semiconductors in addition to the first metal-oxide-semiconductor T1 passes through several switch connection external electricals respectively
Hinder the in-phase end of Rexternal and comparator comparator；The other end connection ground of non-essential resistance Rexternal；Comparator
Power supply Vref is depended merely in the end of oppisite phase connection of comparator.
Further, the detection method of the detection circuit of the exterior arrangement resistance, comprises the following steps：
S1, switch K0 are opened, and rest switch is closed, and flow through the electric current of non-essential resistance Rexternal for I0, Rexternal to ground
Voltage value V=I0*Rexternal, when resistance is in some scope A, comparator output it is confirmable for height；
When resistance is in some scope B, comparator output is confirmable to be low；
Next S2 opens switch K0 and K1, remainder switch is closed, and flows through the electric current of non-essential resistance Rexternal for 2*I0,
Rexternal to ground voltage value V=2*I0*Rexternal, likewise, when non-essential resistance is in some scope C,
Comparator output is confirmable for height；When non-essential resistance is in some scope D, comparator output is confirmable to be low；
S3 continues to repeat the process；So as to by sequentially applying different current known sources, by obtained comparator results
Sequence is inferred to the gear of external connection resistance.
Advantages of the present invention：
The present invention can realize the resolution of reliable more resistance value gear under limited supply voltage scope.
In addition to objects, features and advantages described above, the present invention also has other objects, features and advantages.
Below with reference to figure, the present invention is described in further detail.
Description of the drawings
The attached drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Example and its explanation are applied for explaining the present invention, is not constituted improper limitations of the present invention.
Fig. 1 is the detection circuit schematic diagram of the exterior arrangement resistance of the present invention；
Fig. 2 is the detection method flow chart of the detection circuit of the exterior arrangement resistance of the present invention.
Specific embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, it is right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
With reference to figure 1, as shown in Figure 1, a kind of detection circuit of exterior arrangement resistance, including several metal-oxide-semiconductors, several open
Pass, current source I0, non-essential resistance Rexternal, comparator comparator；The current source I0 connects the first metal-oxide-semiconductor respectively
The drain electrode of T1 and the grid of several other metal-oxide-semiconductors；The source electrode of first metal-oxide-semiconductor T1 connects others several MOS respectively
The grid of pipe；The drain electrode of several metal-oxide-semiconductors in addition to the first metal-oxide-semiconductor T1 passes through several switch connection non-essential resistances respectively
The in-phase end of Rexternal and comparator comparator；The other end connection ground of non-essential resistance Rexternal；Comparator
Power supply Vref is depended merely in the end of oppisite phase connection of comparator.
With reference to figure 2, as shown in Fig. 2, a kind of detection method of the detection circuit of exterior arrangement resistance, comprises the following steps：
S1, switch K0 are opened, and rest switch is closed, and flow through the electric current of non-essential resistance Rexternal for I0, Rexternal to ground
Voltage value V=I0*Rexternal, when resistance is in some scope A, comparator output it is confirmable for height；
When resistance is in some scope B, comparator output is confirmable to be low；
Next S2 opens switch K0 and K1, remainder switch is closed, and flows through the electric current of non-essential resistance Rexternal for 2*I0,
Rexternal to ground voltage value V=2*I0*Rexternal, likewise, when non-essential resistance is in some scope C,
Comparator output is confirmable for height；When non-essential resistance is in some scope D, comparator output is confirmable to be low；
S3 continues to repeat the process；So as to by sequentially applying different current known sources, by obtained comparator results
Sequence is inferred to the gear of external connection resistance.
The detection method particular preferred embodiment of the detection circuit of the exterior arrangement resistance is as follows：
Set Rexternal>（Vref(1+k%)+Vos_comparator）/ (I0 * (1- α %)), then can cause comparator
Each time when the electric current of first time Rexternal is I0 and later, output is all obtained to be high as a result, chip internal is matched somebody with somebody accordingly
It is set to configuration one；When setting Rexternal is in scope：（Vref(1-k%)-Vos_comparator）/ (I0 *(1+α%))>
Rexternal>（Vref(1+k%)+Vos_comparator）During/(2*I0 * (1- α %)), comparator can be obtained and existed
Rexternal flow through when electric current is I0 output be it is low, Rexternal flow through electric current for 2*I0 when and after, comparator output
All it is height, chip internal is configured to configuration two accordingly；When setting Rexternal is in scope：（Vref(1-k%)-Vos_
comparator）/ (2*I0 *(1+α%))>Rexternal>（Vref(1+k%)+Vos_comparator）/ (4*I0 *(1-
α %)) when, it is all low that can obtain comparator to flow through output when electric current is I0 and 2*I0 in Rexternal, is flowed in Rexternal
When overcurrent is 4*I0 and after, comparator output is all height, and chip internal is configured to configuration three accordingly.
Above-described embodiment is only one of embodiment, in actual realization between a series of different current knowns
Relation might not and above-described embodiment, the increase of multiple must be into（Or reduce）.Fig. 1 is also only schematic diagram, actual to realize
The number of middle current source series can not be 7 grades, can be more or less.Comparator is also not necessarily a comparator, can be with
It is multiple comparators, when using multiple comparators, can once realizes the judgement in multiple voltage range sections of the pin voltage.
The present invention can realize the resolution of reliable more resistance value gear under limited supply voltage scope.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all the present invention spirit and
Within principle, any modifications, equivalent replacements and improvements are made should all be included in the protection scope of the present invention.
Claims (2)
1. a kind of detection circuit of exterior arrangement resistance, which is characterized in that including several metal-oxide-semiconductors, several switch, current sources
I0, non-essential resistance Rexternal, comparator comparator；The current source I0 connect respectively the drain electrode of the first metal-oxide-semiconductor T1 with
And the grid of several other metal-oxide-semiconductors；The source electrode of first metal-oxide-semiconductor T1 connects the grid of several other metal-oxide-semiconductors respectively；It removes
The drain electrode of several metal-oxide-semiconductors outside first metal-oxide-semiconductor T1 by several switches connection non-essential resistance Rexternal and is compared respectively
The in-phase end of device comparator；The other end connection ground of non-essential resistance Rexternal；The end of oppisite phase of comparator comparator
Power supply Vref is depended merely in connection.
2. the detection method of the detection circuit of exterior arrangement resistance according to claim 1, which is characterized in that including following
Step：
S1, switch K0 are opened, and rest switch is closed, and flow through the electric current of non-essential resistance Rexternal for I0, Rexternal to ground
Voltage value V=I0*Rexternal, when resistance is in some scope A, comparator output it is confirmable for height；
When resistance is in some scope B, comparator output is confirmable to be low；
Next S2 opens switch K0 and K1, remainder switch is closed, and flows through the electric current of non-essential resistance Rexternal for 2*I0,
Rexternal to ground voltage value V=2*I0*Rexternal, likewise, when non-essential resistance is in some scope C,
Comparator output is confirmable for height；When non-essential resistance is in some scope D, comparator output is confirmable to be low；
S3 continues to repeat the process；So as to by sequentially applying different current known sources, by obtained comparator results
Sequence is inferred to the gear of external connection resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711418361.8A CN108051649B (en) | 2017-12-25 | 2017-12-25 | Detection circuit and detection method for externally configured resistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711418361.8A CN108051649B (en) | 2017-12-25 | 2017-12-25 | Detection circuit and detection method for externally configured resistor |
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| Publication Number | Publication Date |
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| CN108051649A true CN108051649A (en) | 2018-05-18 |
| CN108051649B CN108051649B (en) | 2020-09-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114859124A (en) * | 2022-04-28 | 2022-08-05 | 北京芯格诺微电子有限公司 | Configuration resistance detection method and circuit capable of switching gears |
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| Publication number | Publication date |
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| CN108051649B (en) | 2020-09-11 |
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