CN109358694A - A kind of boot configuration circuit that can be turned down according to supply voltage - Google Patents
A kind of boot configuration circuit that can be turned down according to supply voltage Download PDFInfo
- Publication number
- CN109358694A CN109358694A CN201811350671.5A CN201811350671A CN109358694A CN 109358694 A CN109358694 A CN 109358694A CN 201811350671 A CN201811350671 A CN 201811350671A CN 109358694 A CN109358694 A CN 109358694A
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- China
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- voltage
- supply voltage
- triode
- zener diode
- resistance
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Continuous-Control Power Sources That Use Transistors (AREA)
Abstract
The present invention provides a kind of boot configuration circuits that can be turned down according to supply voltage, and structure is simple, and need to only adjust supply voltage can be changed the level of specialized configuration pin when powering on.It includes supply voltage BAT, access circuit voltage VCC, zener diode D1 is connected after the supply voltage BAT connection RC filter circuit, the breakdown reverse voltage of the zener diode is NV higher than working normally maximum supply voltage, wherein N is the positive number greater than 1, the base stage of the other end connecting triode Q1 of the zener diode D1, the access circuit voltage VCC is connected after the outer connecting resistance R3 of the collector of the triode Q1, the emitter of the triode Q1 is grounded, the collector voltage V3 of the triode Q1 is connected to control chip boot configuration pin by connecting line, the transistor base voltage V2 is grounded after connecting resistance R2 by connecting line.
Description
Technical field
It is specially a kind of to be drawn according to what supply voltage be turned down the present invention relates to the technical field of control chip guidance mode
Lead configuration circuit.
Background technique
Controlling chip, generally there are many program entry guidance modes, including flash, SCI, SPI, CAN etc..Guidance mode
Select the electrical level judging of specialized configuration pin when by powering on.It is generally guided from flash when normal work, that is, powers on rear program and jump
Enter flash guidance interface.If it is desired to be changed to guide from other modes, then need to change the electricity of specialized configuration pin when powering on
Flat, the circuit of the level of specialized configuration pin is complicated when existing change powers on, and needs to change multiple parameters, and manipulation is complicated.
Summary of the invention
In view of the above-mentioned problems, the present invention provides a kind of boot configuration circuit that can be turned down according to supply voltage, structure
Simply, need to only adjust supply voltage can be changed the level of specialized configuration pin when powering on.
A kind of boot configuration circuit that can be turned down according to supply voltage, it is characterised in that: it includes supply voltage BAT, connects
Enter circuit voltage VCC, connects zener diode D1, the zener diode after the supply voltage BAT connection RC filter circuit
Breakdown reverse voltage be it is NV higher than working normally maximum supply voltage, wherein N is positive number greater than 1, the zener diode
The base stage of the other end connecting triode Q1 of D1 connects the access circuit after the outer connecting resistance R3 of the collector of the triode Q1
The emitter of voltage VCC, the triode Q1 are grounded, and the collector voltage V3 of the triode Q1 is connected to control by connecting line
Coremaking piece boot configuration pin, the transistor base voltage V2 are grounded after connecting resistance R2 by connecting line.
It is further characterized by: the RC filter circuit specifically includes resistance R1, capacitor C1, the supply voltage BAT
After connecting the one end the resistance R1, the zener diode of the connection all the way D1 of the other end of the resistance R1, the resistance R1's is another
The another way of one end connects one end of the capacitor C1, the other end ground connection of the capacitor C1；
Preferably, the breakdown reverse voltage of the zener diode is 2V higher than working normally maximum supply voltage, i.e. N's
Value is 2；
Under normal operation, supply voltage BAT is lower than the breakdown reverse voltage of zener diode D1, zener diode D1
Reversed cut-off, the base voltage V2 of triode Q1 are dragged down by resistance R2, and triode Q1 cut-off, collector voltage V3 is drawn by R3
To access circuit voltage VCC, meet high level guide demand；
When needing to change the level of collector voltage V3 to change control chip guidance mode, supply voltage BAT is drawn high
To 3V or more higher than working normally maximum supply voltage, but circuit is not damaged, then zener diode D1 reverse breakdown, base voltage
V2 is 1V at least higher than ground, and triode Q1 conducting, collector voltage V3 is pulled to ground by triode Q1, meets low level guidance need
It asks.
After applying the present invention, select corresponding supply voltage numerical value and zener diode D1 breakdown reverse voltage into
Row comparison, and then the collector voltage V3 output that can directly determine triode Q1 is low level or high level, only needs to adjust
The level of specialized configuration pin, structure are simple when supply voltage is changeable powers on.
Detailed description of the invention
Fig. 1 is structure schematic diagram of the invention.
Specific embodiment
A kind of boot configuration circuit that can be turned down according to supply voltage, is shown in Fig. 1: it includes supply voltage BAT, access circuit
Voltage VCC connects zener diode D1, the breakdown reverse voltage of zener diode after supply voltage BAT connection RC filter circuit
To be NV higher than working normally maximum supply voltage, wherein N is the positive number greater than 1, and the other end of zener diode D1 connects three poles
The base stage of pipe Q1, connection access circuit voltage VCC after the outer connecting resistance R3 of the collector of triode Q1, the emitter of triode Q1 connect
The collector voltage V3 on ground, triode Q1 is connected to control chip boot configuration pin, transistor base voltage by connecting line
V2 is grounded after connecting resistance R2 by connecting line.
Specific embodiment is shown in that Fig. 1: RC filter circuit specifically includes resistance R1, capacitor C1, supply voltage BAT connection resistance
Behind the one end R1, the another way of the zener diode D1 of connection all the way of the other end of resistance R1, the other end of resistance R1 connect capacitor
One end of C1, the other end ground connection of capacitor C1；
The breakdown reverse voltage of zener diode is 2V higher than working normally maximum supply voltage, i.e., the value of N is 2；
Under normal operation, supply voltage BAT is lower than the breakdown reverse voltage of zener diode D1, zener diode D1
Reversed cut-off, the base voltage V2 of triode Q1 are dragged down by resistance R2, and triode Q1 cut-off, collector voltage V3 is drawn by R3
To access circuit voltage VCC, meet high level guide demand；
Need to change collector voltage V3 level with change control chip guidance mode when, by supply voltage BAT draw high to
It is 3V or more higher than working normally maximum supply voltage, but circuit is not damaged, then zener diode D1 reverse breakdown, base voltage V2
1V at least higher than ground, triode Q1 conducting, collector voltage V3 is pulled to ground by triode Q1, meets low level guide demand.
Its working principles are as follows: selecting the numerical value of corresponding supply voltage and the breakdown reverse voltage of zener diode D1
It compares, and then the collector voltage V3 output that can directly determine triode Q1 is low level or high level, only needs to adjust
The level of specialized configuration pin, structure are simple when whole supply voltage is changeable powers on；It is without wire jumper or changes harness company
It connects, only need to be by inputting the supply voltage more than normal range of operation, i.e., the changeable program entry guidance mode for controlling chip,
It can be convenient efficiently more new procedures in practical applications.
Specific embodiments of the present invention are described in detail above, but content is only the preferable implementation of the invention
Example, should not be considered as limiting the invention the practical range of creation.It is all to become according to equalization made by the invention application range
Change and improve etc., it shall still fall within the scope of this patent.
Claims (5)
1. a kind of boot configuration circuit that can be turned down according to supply voltage, it is characterised in that: it includes supply voltage BAT, access
Circuit voltage VCC connects zener diode D1 after the supply voltage BAT connection RC filter circuit, the zener diode
Breakdown reverse voltage is NV higher than working normally maximum supply voltage, and wherein N is the positive number greater than 1, the zener diode D1
Other end connecting triode Q1 base stage, it is electric to connect the access circuit after the outer connecting resistance R3 of the collector of the triode Q1
VCC, the emitter ground connection of the triode Q1 are pressed, the collector voltage V3 of the triode Q1 is connected to control by connecting line
Chip boot configuration pin, the transistor base voltage V2 are grounded after connecting resistance R2 by connecting line.
2. a kind of boot configuration circuit that can be turned down according to supply voltage as described in claim 1, it is characterised in that: the RC
After filter circuit specifically includes resistance R1, the one end capacitor C1, the supply voltage BAT connection resistance R1, the resistance R1
The other end the zener diode of connection all the way D1, the another way of the other end of the resistance R1 connects the one of the capacitor C1
End, the other end ground connection of the capacitor C1.
3. a kind of boot configuration circuit that can be turned down according to supply voltage as claimed in claim 1 or 2, it is characterised in that: institute
The breakdown reverse voltage of zener diode is stated to be 2V higher than working normally maximum supply voltage, i.e., the value of N is 2.
4. a kind of boot configuration circuit that can be turned down according to supply voltage as claimed in claim 3, it is characterised in that: power supply electricity
BAT is pressed to be lower than the breakdown reverse voltage of zener diode D1, zener diode D1 reversely ends, the base voltage V2 of triode Q1
It is dragged down by resistance R2, triode Q1 cut-off, collector voltage V3 is pulled to access circuit voltage VCC by R3, meets high level
Guide demand.
5. a kind of boot configuration circuit that can be turned down according to supply voltage as claimed in claim 4, it is characterised in that: needs change
When becoming the level of collector voltage V3 to change control chip guidance mode, supply voltage BAT is drawn high to than working normally most
The high 3V or more of big supply voltage, but do not damage circuit, then zener diode D1 reverse breakdown, base voltage V2 are at least higher than ground
1V, triode Q1 conducting, collector voltage V3 are pulled to ground by triode Q1, meet low level guide demand.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350671.5A CN109358694A (en) | 2018-11-14 | 2018-11-14 | A kind of boot configuration circuit that can be turned down according to supply voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811350671.5A CN109358694A (en) | 2018-11-14 | 2018-11-14 | A kind of boot configuration circuit that can be turned down according to supply voltage |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109358694A true CN109358694A (en) | 2019-02-19 |
Family
ID=65345074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811350671.5A Pending CN109358694A (en) | 2018-11-14 | 2018-11-14 | A kind of boot configuration circuit that can be turned down according to supply voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109358694A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050024029A1 (en) * | 2003-08-01 | 2005-02-03 | Hsi-Chih Peng | Voltage regulator circuit of integrated circuit chip |
| CN102023692A (en) * | 2009-09-23 | 2011-04-20 | 深圳Tcl新技术有限公司 | Reset circuit |
| CN205202921U (en) * | 2015-12-23 | 2016-05-04 | 深圳市伊爱高新技术开发有限公司 | Vehicle switching signal automatic identification circuit and mobile unit |
| CN206993087U (en) * | 2017-05-26 | 2018-02-09 | 昆明理工大学 | A kind of signal conversion interface circuit |
-
2018
- 2018-11-14 CN CN201811350671.5A patent/CN109358694A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050024029A1 (en) * | 2003-08-01 | 2005-02-03 | Hsi-Chih Peng | Voltage regulator circuit of integrated circuit chip |
| CN102023692A (en) * | 2009-09-23 | 2011-04-20 | 深圳Tcl新技术有限公司 | Reset circuit |
| CN205202921U (en) * | 2015-12-23 | 2016-05-04 | 深圳市伊爱高新技术开发有限公司 | Vehicle switching signal automatic identification circuit and mobile unit |
| CN206993087U (en) * | 2017-05-26 | 2018-02-09 | 昆明理工大学 | A kind of signal conversion interface circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190219 |
|
| RJ01 | Rejection of invention patent application after publication |