CN206162371U - Power supply and write -protect multiplex circuit - Google Patents
Power supply and write -protect multiplex circuit Download PDFInfo
- Publication number
- CN206162371U CN206162371U CN201621161357.9U CN201621161357U CN206162371U CN 206162371 U CN206162371 U CN 206162371U CN 201621161357 U CN201621161357 U CN 201621161357U CN 206162371 U CN206162371 U CN 206162371U
- Authority
- CN
- China
- Prior art keywords
- resistance
- power supply
- write
- protect
- zener diode
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model provides a power supply and write -protect multiplex circuit includes memory chip U1, triode Q1, zener diode Z1, schottky diode D1, resistance R1, resistance R2 and resistance R3, memory chip U1's WP end connecting resistance R1's one end, triode Q1's collecting electrode, first power end is connected to memory chip U1's VCC end, resistance R1's one end, triode Q1's base connecting resistance R2's one end, zener diode Z1's positive pole, resistance R2's one end, triode Q1's emitter ground, zener diode Z1's negative pole passes through the negative pole that resistance R3 connects output and schottky diode D1, schottky diode D1's the anodal second source end of connecting. The utility model discloses well power supply and write -protect are controlled with a pin output, utilize zener diode's on -state characteristic, distinguish still write -protect control of power supply (voltage is low) (voltage is high) function, the nervous problem of solution interface pin.
Description
Technical field
This utility model is related to circuit field, in particular it relates to a kind of power supply and write-protect multiplex circuit.
Background technology
Electronic product external interface is increasingly complicated, and old product often runs into the not enough situation of interface pin when upgrading.
Exist needs the occasion of power supply output and write-protect control simultaneously.
In upgrading scheme of the prior art, in the case that interface pin is not enough, exist while needing power supply to export
With the occasion of write-protect control, also can only take increases the mode of interface, while may need to change outer casing mold；Not only spend
Higher expense, and extend heave period.
Utility model content
For defect of the prior art, the purpose of this utility model is to provide a kind of power supply and write-protect multiplex circuit.
The power supply provided according to this utility model and write-protect multiplex circuit, including storage chip U1, audion Q1, voltage stabilizing
Diode Z1, Schottky diode D1, resistance R1, resistance R2 and resistance R3；
One end, the colelctor electrode of audion Q1 of the WP ends connection resistance R1 of storage chip U1, the VCC ends of storage chip U1,
One end of resistance R1 connects the first power end；
The base stage of audion Q1 connects one end, the positive pole of Zener diode Z1 of resistance R2, one end of resistance R2, audion
The grounded emitter of Q1；
The negative pole of Zener diode Z1 connects the negative pole of outfan and Schottky diode D1, Schottky two by resistance R3
The positive pole connection second source end of pole pipe D1.
Preferably, also including the first power supply and the second power supply；
Wherein, first power supply connects first power end；The second power supply connection described second
Power end.
Preferably, the storage chip U1 adopts the storage chip of model 24C04.
Preferably, the GND ends ground connection of the storage chip U1.
Preferably, first power supply adopts the power supply of 3.3V；Second power supply adopts the power supply of 5V.
Compared with prior art, this utility model has following beneficial effect：
1st, power supply and write-protect control are exported with a pin in this utility model, using the conducting of Zener diode
Characteristic solves the problems, such as interface pin anxiety distinguishing power supply (voltage is low) or write-protect control (voltage high) function；
2nd, this utility model simple structure, it is rationally distributed, it is easy to promote.
Description of the drawings
By reading the detailed description made to non-limiting example with reference to the following drawings, other spies of the present utility model
Levy, objects and advantages will become more apparent upon：
Fig. 1 is structural representation of the present utility model.
Specific embodiment
This utility model is described in detail with reference to specific embodiment.Following examples will be helpful to this area
Technical staff further understands this utility model, but does not limit this utility model in any form.It should be pointed out that to ability
For the those of ordinary skill in domain, without departing from the concept of the premise utility, some deformations and improvement can also be made.
These belong to protection domain of the present utility model.
In the present embodiment, this utility model is provided power supply and write-protect multiplex circuit, including storage chip U1, three poles
Pipe Q1, Zener diode Z1, Schottky diode D1, resistance R1, resistance R2 and resistance R3；
One end, the colelctor electrode of audion Q1 of the WP ends connection resistance R1 of storage chip U1, the VCC ends of storage chip U1,
One end of resistance R1 connects the first power end；
The base stage of audion Q1 connects one end, the positive pole of Zener diode Z1 of resistance R2, one end of resistance R2, audion
The grounded emitter of Q1；
The negative pole of Zener diode Z1 connects the negative pole of outfan and Schottky diode D1, Schottky two by resistance R3
The positive pole connection second source end of pole pipe D1.
Power supply and write-protect multiplex circuit that this utility model is provided, also including the first power supply and the second power supply electricity
Source；
Wherein, first power supply connects first power end；The second power supply connection described second
Power end.
The storage chip U1 adopts the storage chip of model 24C04.The GND ends ground connection of the storage chip U1.Institute
State power supply of first power supply using 3.3V；Second power supply adopts the power supply of 5V.
In the present embodiment, the outfan is OUTPUT/WE ends, and when OUTPUT/WE ends export as power supply, 5V is electric
Source externally exports the voltage of about 4.7V by Schottky diode D1, and now the voltage on 8.2V Zener diodes Z1 is 4.7V,
Zener diode is not turned on, and only leakage current leaks through R2, and audion Q1 is in cut-off state.The write-protect pin of storage chip U1
WP is pulled upward to 3.3V by R1, and storage chip U1 is in write-protect state.
When OUTPUT/WE is used as write-protect control input, the power supply of 12V is accessed in outside, and 8.2V Zener diode Z1 lead
Logical, electric current crosses the base stage of audion Q1, audion Q1 conductings.It is low that the write-protect pin WP of storage chip U1 is drawn by audion Q1
Level.Storage chip U1 is in can write state.
In the present embodiment, power supply and write-protect control are exported with a pin in this utility model, using voltage stabilizing
The on state characteristic of diode solves mouthpiece distinguishing power supply (voltage is low) or write-protect control (voltage high) function
The nervous problem of foot；This utility model simple structure, it is rationally distributed, it is easy to promote.
Specific embodiment of the utility model is described above.It is to be appreciated that this utility model not office
It is limited to above-mentioned particular implementation, those skilled in the art can within the scope of the claims make various modifications or modification,
This has no effect on flesh and blood of the present utility model.
Claims (5)
1. it is a kind of to power and write-protect multiplex circuit, it is characterised in that including storage chip U1, audion Q1, Zener diode
Z1, Schottky diode D1, resistance R1, resistance R2 and resistance R3；
The WP ends of storage chip U1 connect one end, the colelctor electrode of audion Q1 of resistance R1, the VCC ends of storage chip U1, resistance
One end of R1 connects the first power end；
The base stage of audion Q1 connects one end, the positive pole of Zener diode Z1 of resistance R2, one end of resistance R2, audion Q1
Grounded emitter；
The negative pole of Zener diode Z1 connects the negative pole of outfan and Schottky diode D1, Schottky diode by resistance R3
The positive pole connection second source end of D1.
2. power supply according to claim 1 and write-protect multiplex circuit, it is characterised in that also including the first power supply and
Second power supply；
Wherein, first power supply connects first power end；Second power supply connects the second source
End.
3. it is according to claim 1 to power and write-protect multiplex circuit, it is characterised in that the storage chip U1 adopts type
Number for 24C04 storage chip.
4. it is according to claim 1 to power and write-protect multiplex circuit, it is characterised in that the GND of the storage chip U1
End ground connection.
5. it is according to claim 2 to power and write-protect multiplex circuit, it is characterised in that first power supply is adopted
The power supply of 3.3V；Second power supply adopts the power supply of 5V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621161357.9U CN206162371U (en) | 2016-11-01 | 2016-11-01 | Power supply and write -protect multiplex circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621161357.9U CN206162371U (en) | 2016-11-01 | 2016-11-01 | Power supply and write -protect multiplex circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206162371U true CN206162371U (en) | 2017-05-10 |
Family
ID=58656141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621161357.9U Active CN206162371U (en) | 2016-11-01 | 2016-11-01 | Power supply and write -protect multiplex circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206162371U (en) |
-
2016
- 2016-11-01 CN CN201621161357.9U patent/CN206162371U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105955094A (en) | Power regulation control circuit of electronic cigarette | |
| CN107179800A (en) | A kind of internal electric source generation circuit with clamper function | |
| CN103036411A (en) | Charge pump circuit | |
| CN205005030U (en) | Electronic information anti -jamming circuit | |
| CN102375129A (en) | Power supply testing circuit | |
| CN206162371U (en) | Power supply and write -protect multiplex circuit | |
| CN204189163U (en) | A kind of based on I2C bus from machine feed circuit and device | |
| CN203535416U (en) | A digital signal processing chip power supply circuit | |
| CN203405751U (en) | Novel voltage stabilizer circuit structure | |
| CN203661030U (en) | Electrical level switching circuit and circuit board having same | |
| CN206039739U (en) | HOSTUSB function sharing circuit that charges | |
| CN205375223U (en) | The low voltage power supply control by temperature change circuit | |
| CN208079464U (en) | Each module of power source internal starts sequential control circuit | |
| CN208028611U (en) | A kind of 12V accumulators input system USB power supply and data transmission circuit | |
| CN105471421B (en) | A kind of level shifting circuit | |
| CN207529331U (en) | There is the computer of USB power supply protections | |
| CN202143049U (en) | General purpose input output (GPIO) isolating circuit | |
| CN207339648U (en) | A kind of voltage conversion circuit for Internet of Things single-site data acquisition | |
| CN201118442Y (en) | A low-voltage power circuit | |
| CN104796628B (en) | Video signal recognition circuit | |
| CN204362018U (en) | A kind of USB device power supply circuits and electronic installation | |
| CN205596091U (en) | Many level control circuit | |
| CN107610734B (en) | Power supply circuit of EEPROM and EEPROM | |
| CN208754185U (en) | A kind of power supply processing device of low-voltage Low phase noise | |
| CN204518119U (en) | A kind of LED daylight lamp power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |