CN208400134U - Application circuit for SIM card reader - Google Patents
Application circuit for SIM card reader Download PDFInfo
- Publication number
- CN208400134U CN208400134U CN201821235340.2U CN201821235340U CN208400134U CN 208400134 U CN208400134 U CN 208400134U CN 201821235340 U CN201821235340 U CN 201821235340U CN 208400134 U CN208400134 U CN 208400134U
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- CN
- China
- Prior art keywords
- sim card
- field
- triode
- effect tube
- card slot
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Abstract
It further include the SIM card control module being electrically connected with main control chip U1, sim card slot U3, sim card slot U4 the utility model discloses a kind of application circuit for SIM card reader, including main control chip U1；SIM card control module includes first control circuit, second control circuit, and first control circuit includes triode Q1, field-effect tube Q2, and second control circuit includes triode Q3, field-effect tube Q4；The control terminal of the base stage connection main control chip of triode Q1, the grid of the collector connection field-effect tube Q2 of triode Q1, the energization input of the drain electrode connection sim card slot U3 of field-effect tube Q2, the control terminal of the base stage connection main control chip of triode Q3, the grid of the collector connection field-effect tube Q4 of triode Q3, the sources connected in parallel of the energization input of the drain electrode connection sim card slot U4 of field-effect tube Q4, the source electrode of field-effect tube Q2 and the field-effect tube Q4 access power supply.The utility model realizes SIM card switching by the power supply of control sim card slot.
Description
Technical field
The utility model relates to SIM card technical fields, more particularly to a kind of application circuit for SIM card reader.
Background technique
The devices such as MIFI, 4G router do not support double-card dual-standby at present, need to use SIM when needing using two SIM cards
Card reader, existing SIM card reader complete corresponding function by using special IC, IC it is at high cost cause it is existing
SIM card reader higher cost, and occupy GPIO mouth it is more, it is more demanding to the voltage of input.
Utility model content
The purpose of this utility model is to provide a kind of application circuits and SIM card for SIM card reader at low cost
Card reader.
The technology that a kind of application circuit and SIM card reader for SIM card reader disclosed by the utility model uses
Scheme is:
A kind of application circuit for SIM card reader, including main control chip U1 further include and the main control chip U1 electricity
Property connection SIM card control module, sim card slot U3, sim card slot U4.
The SIM card control module includes first control circuit, second control circuit, and the first control circuit includes three
Pole pipe Q1, field-effect tube Q2, the second control circuit include triode Q3, field-effect tube Q4.
The base stage of the triode Q1 connects the control terminal of the main control chip, and the collector of the triode Q1 connects institute
The grid of field-effect tube Q2, the emitter ground connection of the triode Q1 are stated, the drain electrode of the field-effect tube Q2 connects the SIM card
The energization input of slot U3, the base stage of the triode Q3 connect the control terminal of the main control chip, the collection of the triode Q3
Electrode connects the grid of the field-effect tube Q4, the emitter ground connection of the triode Q3, and the drain electrode of the field-effect tube Q4 connects
The energization input of the sim card slot U4 is connect, resistance R13 is connected between the source electrode and grid of the field-effect tube Q2, it is described
Resistance R19, the source electrode of the field-effect tube Q2 and the field-effect tube Q4 are connected between the source electrode and grid of field-effect tube Q4
Sources connected in parallel access power supply.
Preferably, it is electrically connected between the pin CD of the sim card slot U3 and the main control chip U1.
Preferably, the base series of the triode Q1 have resistance R1, the base stage and transmitting of the triode Q1
Resistance R2 is connected between pole.
Preferably, the base series of the triode Q3 have resistance R3, the base stage and transmitting of the triode Q3
Resistance R4 is connected between pole.
Preferably, it is connected between the drain electrode of the field-effect tube Q2 and the energization input of the sim card slot U3
There are capacitor C20, the other end ground connection of the capacitor C20.
Preferably, it is connected between the drain electrode of the field-effect tube Q4 and the energization input of the sim card slot U4
There are capacitor C26, the other end ground connection of the capacitor C26.
A kind of SIM card reader, the application circuit including being used for SIM card reader as described above.
The utility model provides a kind of application circuit for SIM card reader, main control chip U1 according to sim card slot U3 and
Sim card slot U4 is inserted into the case where SIM card, then export and controls signal to the first control circuit of SIM card control module or the
Two control circuits.By controlling the on-off of the triode Q1 and field-effect tube Q2 of first control circuit, sim card slot U3 and electricity are controlled
On-off between source, by control second control circuit triode Q3 and field-effect tube Q4 on-off, control sim card slot U4 and
On-off between power supply, to achieve the purpose that select one from sim card slot U3 or sim card slot U4 to use.This is practical new
Type circuit structure is simple, does not need to manufacture special IC, occupies GPIO mouthfuls less, by controlling the power supply of this two sim card slots,
It can reach the function of selecting one of SIN card work.
The utility model provides a kind of SIM card reader, by using the above-mentioned application circuit for SIM card reader,
Cost is saved.
Detailed description of the invention
Fig. 1 is the first control circuit and the second control electricity of the application circuit for SIM card reader of the utility model
The structural schematic diagram on road.
Fig. 2 is the knot of the sim card slot U3 and sim card slot U4 of the application circuit for SIM card reader of the utility model
Structure schematic diagram.
Specific embodiment
The utility model is further elaborated and is illustrated with Figure of description combined with specific embodiments below:
Please refer to Fig. 1,2, a kind of application circuit for SIM card reader, including main control chip U1, further include with it is described
The SIM card control module of main control chip U1 electric connection, sim card slot U3, sim card slot U4, the model of the sim card slot U3
The model m2m vqfn48, the model ZX29752113 of the main control chip of mup c792, the sim card slot U4.
The SIM card control module includes first control circuit, second control circuit, and the first control circuit includes three
Pole pipe Q1, field-effect tube Q2, the second control circuit include triode Q3, field-effect tube Q4.
The base stage of the triode Q1 connects the control terminal of the main control chip, and the collector of the triode Q1 connects institute
The grid of field-effect tube Q2, the emitter ground connection of the triode Q1 are stated, the drain electrode of the field-effect tube Q2 connects the SIM card
The energization input of slot U3, the base stage of the triode Q3 connect the control terminal of the main control chip, the collection of the triode Q3
Electrode connects the grid of the field-effect tube Q4, the emitter ground connection of the triode Q3, and the drain electrode of the field-effect tube Q4 connects
The energization input of the sim card slot U4 is connect, resistance R13 is connected between the source electrode and grid of the field-effect tube Q2, it is described
Resistance R19, the source electrode of the field-effect tube Q2 and the field-effect tube Q4 are connected between the source electrode and grid of field-effect tube Q4
Sources connected in parallel access power supply.
It is electrically connected between the pin CD of the sim card slot U3 and the main control chip U1.When U3 card slot is inserted into SIM card
When, the elastic slice of CD pin inner portions ground connection is flicked, which is high level, when being not inserted into SIM card, CD pin inner portions ground connection,
The pin is low level.
The base series of the triode Q1 have resistance R1, are connected with electricity between the base stage and emitter of the triode Q1
Hinder R2.
The base series of the triode Q3 have resistance R3, are connected with electricity between the base stage and emitter of the triode Q3
Hinder R4.
Capacitor C20 is connected between the drain electrode of the field-effect tube Q2 and the energization input of the sim card slot U3, it is described
The other end of capacitor C20 is grounded.
Capacitor C26 is connected between the drain electrode of the field-effect tube Q4 and the energization input of the sim card slot U4, it is described
The other end of capacitor C26 is grounded.
Specifically, the triode Q1 and the triode Q3 are NPN type triode, the field-effect tube Q2 and field effect
Should pipe Q4 be P-channel field-effect transistor (PEFT) pipe.
It should be noted that entity card built in sim card slot U4, when sim card slot U3 is inserted into SIM card, sim card slot U3's draws
The elastic slice of foot CD inner ground is flicked, and the pin CD output high level of sim card slot U3 feeds back to main control chip U1, main control chip
U1 receives the next signal of sim card slot U3 feedback to judge to insert SIM card in sim card slot U3.The high electricity of main control chip U1 output
The collector and emitter of triode Q1 is connected in the base stage for putting down the triode Q1 of first control circuit, at this time the second control
The base stage of the triode Q3 of circuit is that low level is in off state.The grid of the collector connection field-effect tube Q2 of triode Q1
Pole, after triode Q1 conducting, the grid voltage of field-effect tube Q2 is pulled low, the source electrode and drain electrode conducting of field-effect tube Q2.At this point,
The grid of the collector connection field-effect tube Q4 of triode Q3, triode Q3 cut-off, the grid voltage of field-effect tube Q4 is by resistance
R19 is drawn high in off state.To, sim card slot U4 cannot connect to power supply and work, and sim card slot U3 is connected to power supply,
Start to work normally.
A kind of SIM card reader, the application circuit including being used for SIM card reader as described above.
The utility model provides a kind of application circuit for SIM card reader, main control chip U1 according to sim card slot U3 and
Sim card slot U4 is inserted into the case where SIM card, then export and controls signal to the first control circuit of SIM card control module or the
Two control circuits.By controlling the on-off of the triode Q1 and field-effect tube Q2 of first control circuit, sim card slot U3 and electricity are controlled
On-off between source, by control second control circuit triode Q3 and field-effect tube Q4 on-off, control sim card slot U4 and
On-off between power supply, to achieve the purpose that select one from sim card slot U3 or sim card slot U4 to use.This is practical new
Type circuit structure is simple, does not need to manufacture special IC, occupies GPIO mouthfuls less, by controlling the power supply of this two sim card slots,
It can reach the function of selecting one of SIN card work.
The utility model provides a kind of SIM card reader, by using the above-mentioned application circuit for SIM card reader,
Cost is saved.
Finally it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than to this reality
With the limitation of novel protected range, although being explained in detail referring to preferred embodiment to the utility model, this field it is general
Lead to it will be appreciated by the skilled person that can be with the technical solution of the present invention is modified or equivalently replaced, without departing from this
The spirit and scope of utility model technical solution.
Claims (7)
1. a kind of application circuit for SIM card reader, it is characterised in that: including main control chip U1, further include and the master
Control SIM card control module, the sim card slot U3, sim card slot U4 that chip U1 is electrically connected；
The SIM card control module includes first control circuit, second control circuit, and the first control circuit includes triode
Q1, field-effect tube Q2, the second control circuit include triode Q3, field-effect tube Q4；
The base stage of the triode Q1 connects the control terminal of the main control chip, and the collector of the triode Q1 connects the field
The grid of effect pipe Q2, the emitter ground connection of the triode Q1, the drain electrode of the field-effect tube Q2 connect the sim card slot U3
Energization input, the base stage of the triode Q3 connects the control terminal of the main control chip, the collector of the triode Q3
The grid of the field-effect tube Q4, the emitter ground connection of the triode Q3 are connected, the drain electrode of the field-effect tube Q4 connects institute
The energization input of sim card slot U4 is stated, resistance R13, the field effect are connected between the source electrode and grid of the field-effect tube Q2
Resistance R19, the source of the source electrode of the field-effect tube Q2 and the field-effect tube Q4 should be connected between the source electrode and grid of pipe Q4
Access power supply extremely in parallel.
2. being used for the application circuit of SIM card reader as described in claim 1, it is characterised in that: the sim card slot U3's draws
It is electrically connected between foot CD and the main control chip U1.
3. being used for the application circuit of SIM card reader as described in claim 1, it is characterised in that: the base of the triode Q1
Pole is in series with resistance R1, is connected with resistance R2 between the base stage and emitter of the triode Q1.
4. being used for the application circuit of SIM card reader as described in claim 1, it is characterised in that: the base of the triode Q3
Pole is in series with resistance R3, is connected with resistance R4 between the base stage and emitter of the triode Q3.
5. being used for the application circuit of SIM card reader as described in claim 1, it is characterised in that: the field-effect tube Q2's
Capacitor C20, the other end ground connection of the capacitor C20 are connected between drain electrode and the energization input of the sim card slot U3.
6. being used for the application circuit of SIM card reader as described in claim 1, it is characterised in that: the field-effect tube Q4's
Capacitor C26, the other end ground connection of the capacitor C26 are connected between drain electrode and the energization input of the sim card slot U4.
7. a kind of SIM card reader, the application circuit for SIM card reader including such as claim 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821235340.2U CN208400134U (en) | 2018-08-01 | 2018-08-01 | Application circuit for SIM card reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821235340.2U CN208400134U (en) | 2018-08-01 | 2018-08-01 | Application circuit for SIM card reader |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208400134U true CN208400134U (en) | 2019-01-18 |
Family
ID=65129248
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821235340.2U Active CN208400134U (en) | 2018-08-01 | 2018-08-01 | Application circuit for SIM card reader |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208400134U (en) |
-
2018
- 2018-08-01 CN CN201821235340.2U patent/CN208400134U/en active Active
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