CN206370825U - A kind of low cost simple SMBUS bus level change-over circuits - Google Patents
A kind of low cost simple SMBUS bus level change-over circuits Download PDFInfo
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- CN206370825U CN206370825U CN201720032292.6U CN201720032292U CN206370825U CN 206370825 U CN206370825 U CN 206370825U CN 201720032292 U CN201720032292 U CN 201720032292U CN 206370825 U CN206370825 U CN 206370825U
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Abstract
A kind of low cost simple SMBUS bus level change-over circuits involved by the utility model, including part main control chip circuit, connector interface circuit.Because being provided with the SMBUS signal level conversion circuits acted on for switching levels between part main control chip circuit and connector interface circuit.When the SMB_CLK signals of the 3.3V level of part main control chip circuit output, by metal-oxide-semiconductor Q1,5V level is pulled upward to by resistance R3,5V level is raised；When the SMB_DATA signals of the 3.3V level of part main control chip circuit output, by metal-oxide-semiconductor Q2,5V level is pulled upward to by resistance R5,5V level is raised.While metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 S poles and D poles two ends have one-way conduction effect, it is therefore prevented that 5V power supplys pour in down a chimney to 3.3V power supplys, protect part main control chip circuit；Industrial computer mainboard SMBUS bus levels are raised to the purpose for meeting external equipment demand by such a simpler hardware circuit realiration, so that circuit structure is simple, cost is low, highly versatile.
Description
【Technical field】
The utility model is related to a kind of low cost simple SMBUS bus level change-over circuits for industrial computer field.
【Background technology】
With scientific and technological constantly progressive and development, it is applied to industrial computer mainboard in industry-by-industry.Using process
In, industrial computer mainboard often uses SMBUS buses, and the level of the SMBUS buses of industrial computer mainboard output is usually 3.3V
Level, but be due to that the peripheral hardware that the SMBUS buses are connected is largely 5V level, in the process, it is necessary to which a level turns
The circuit changed.However, Normal practice is realized using an electrical level transferring chip.Because the level shifting circuit passes through level
Conversion chip is realized, causes cost higher, circuit design is relative complex.
【Utility model content】
In view of prior art defect, the utility model technical purpose be in order to solve the problem of above-mentioned prior art is present and
There is provided a kind of circuit structure simple, cost is low, the low cost simple SMBUS bus level change-over circuits of highly versatile.
In order to realize above-mentioned technical purpose, the utility model provides a kind of low cost simple SMBUS bus levels conversion
Circuit, it includes part main control chip circuit, connector interface circuit；Described part main control chip circuit and connector interface
The SMBUS signal level conversion circuits acted on for switching levels, the SMBUS signal level conversion circuits are provided between circuit
Including metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2；The resistance R6 at metal-oxide-semiconductor Q1 two ends is connected in parallel in, connection and metal-oxide-semiconductor Q1 one end and resistance R6 are common
There is the resistance R2 at end, be connected to the SMB CLK ends of the resistance R2 other ends, be series at the resistance R3 on the metal-oxide-semiconductor Q1 other ends, even
Metal-oxide-semiconductor Q1 and the electric capacity C3 at the shared end of resistance R3 intersections are connected to, the SMB CLK R ends on electric capacity C3 are connected to；Parallel connection is even
The resistance R7 at metal-oxide-semiconductor Q2 two ends is connected to, connection has the resistance R4 at end with metal-oxide-semiconductor Q2 one end and resistance R7, is connected to resistance
The SMB DATA ends of the R4 other ends, are series at the resistance R5 on the metal-oxide-semiconductor Q2 other ends, are connected to metal-oxide-semiconductor Q2 and intersect with resistance R5
The electric capacity C4 at the shared end at place, is connected to the SMB DATA R ends on electric capacity C4；As the 3.3V of part main control chip circuit output
The SMB_CLK signals of level, by metal-oxide-semiconductor Q1,5V level is pulled upward to by resistance R3,5V level is raised；When part master control
The SMB_DATA signals of the 3.3V level of chip circuit output, by metal-oxide-semiconductor Q2,5V level are pulled upward to by resistance R5, by 5V
Level is raised.
According to above-mentioned technical characteristics, the part main control chip circuit includes chip U1, is connected to chip U1
The SMB DATA ends of side, SMB_CLK ends；The resistance R1 on chip U1, electric capacity C2 are connected in parallel in,；It is connected to resistance R1 mono-
The electric capacity C1 at end.
According to above-mentioned technical characteristics, the connector interface circuit includes SMBUS interface ends, is connected to
ESD electrostatic protection devices ES1, ESD electrostatic protection device ES2 in SMBUS interface ends, is connected in SMBUS interface ends
SMB_CLK_R ends, SMB_DATA_R ends.
Advantageous effects of the present utility model：Because between described part main control chip circuit and connector interface circuit
The SMBUS signal level conversion circuits acted on for switching levels are provided with, the SMBUS signal levels conversion circuit includes MOS
Pipe Q1, metal-oxide-semiconductor Q2；The resistance R6 at metal-oxide-semiconductor Q1 two ends is connected in parallel in, connection is had at end with metal-oxide-semiconductor Q1 one end and resistance R6
Resistance R2, be connected to the SMB CLK ends of the resistance R2 other ends, be series at the resistance R3 on the metal-oxide-semiconductor Q1 other ends, be connected to
The metal-oxide-semiconductor Q1 and electric capacity C3 at the shared end of resistance R3 intersections, is connected to the SMB CLK R ends on electric capacity C3；It is connected in parallel in
The resistance R7 at metal-oxide-semiconductor Q2 two ends, connection has the resistance R4 at end with metal-oxide-semiconductor Q2 one end and resistance R7, is connected to resistance R4 another
The SMB DATA ends of one end, are series at the resistance R5 on the metal-oxide-semiconductor Q2 other ends, are connected to metal-oxide-semiconductor Q2 and resistance R5 intersections
The electric capacity C4 at shared end, is connected to the SMB DATA R ends on electric capacity C4；When the 3.3V level of part main control chip circuit output
SMB_CLK signals, by metal-oxide-semiconductor Q1,5V level is pulled upward to by resistance R3,5V level is raised；When part main control chip
The SMB_DATA signals of the 3.3V level of circuit output, by metal-oxide-semiconductor Q2,5V level is pulled upward to by resistance R5, by 5V level
Raise.While metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 S poles and D poles two ends have one-way conduction effect, it is therefore prevented that 5V power supplys pour in down a chimney to 3.3V
Power supply, protects part main control chip circuit；By such a simpler hardware circuit realiration by industrial computer mainboard SMBUS buses
Level raises the purpose for meeting external equipment demand, so that circuit structure is simple, cost is low, highly versatile.
To have further understanding to the purpose of this utility model, construction feature and its function, hereby coordinate accompanying drawing specifically
It is bright as follows：
【Brief description of the drawings】
Fig. 1 is the schematic diagram of low cost simple SMBUS bus level change-over circuits in the utility model；
Fig. 2 is the schematic diagram of part main control chip circuit in the utility model；
Fig. 3 is the schematic diagram of SMBUS signal level conversion circuits in the utility model；
Fig. 4 is the schematic diagram of connector interface circuit in the utility model.
【Embodiment】
In order that technical problem to be solved in the utility model, technical scheme and beneficial effect are clearer, clear, with
Under in conjunction with the accompanying drawings and embodiments, the utility model is further elaborated.It should be appreciated that specific reality described herein
Example is applied only to explain the utility model, is not used to limit the utility model.
Refer to shown in Fig. 1 to Fig. 4, illustrate that the utility model provides a kind of low cost simple with reference to embodiment
SMBUS bus level change-over circuits, it includes part main control chip circuit, connector interface circuit, and SMBUS signal levels
Conversion circuit.
SMBUS signal levels conversion circuit includes metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2；It is connected in parallel in the resistance at metal-oxide-semiconductor Q1 two ends
R6, connection has the resistance R2 at end with metal-oxide-semiconductor Q1 one end and resistance R6, is connected to the SMB CLK ends of the resistance R2 other ends, goes here and there
The resistance R3 on the metal-oxide-semiconductor Q1 other ends is coupled to, metal-oxide-semiconductor Q1 and the electric capacity C3 at the shared end of resistance R3 intersections, connection is connected to
In the SMB CLK R ends on electric capacity C3；It is connected in parallel in the resistance R7 at metal-oxide-semiconductor Q2 two ends, connection and metal-oxide-semiconductor Q2 one end and resistance
R7 has the resistance R4 at end, is connected to the SMB DATA ends of the resistance R4 other ends, is series at the resistance on the metal-oxide-semiconductor Q2 other ends
R5, is connected to metal-oxide-semiconductor Q2 and the electric capacity C4 at the shared end of resistance R5 intersections, is connected to the SMB DATA R ends on electric capacity C4.
The part main control chip circuit includes chip U1, is connected to the SMB DATA ends of chip U1 sides, SMB_CLK ends；And
Connection is connected to resistance R1, electric capacity C2 on chip U1,；It is connected to the electric capacity C1 of resistance R1 one end.The connector interface circuit
Including SMBUS interface ends, ESD electrostatic protection devices ES1, the ESD electrostatic protection device in SMBUS interface ends is connected to
ES2, is connected to the SMB_CLK_R ends in SMBUS interface ends, SMB_DATA_R ends.
Described SMBUS signal levels conversion circuit one end is connected with part main control chip circuit, and the SMBUS signals are electric
The flat conversion circuit other end is connected with connector interface circuit.
Because being provided with what is acted on for switching levels between described part main control chip circuit and connector interface circuit
SMBUS signal level conversion circuits, the SMBUS signal levels conversion circuit includes metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2；It is connected in parallel in
The resistance R6 at metal-oxide-semiconductor Q1 two ends, connection has the resistance R2 at end with metal-oxide-semiconductor Q1 one end and resistance R6, is connected to resistance R2 another
The SMB CLK ends of one end, are series at the resistance R3 on the metal-oxide-semiconductor Q1 other ends, are connected to being total to for metal-oxide-semiconductor Q1 and resistance R3 intersections
There is the electric capacity C3 at end, be connected to the SMB CLK R ends on electric capacity C3；Be connected in parallel in the resistance R7 at metal-oxide-semiconductor Q2 two ends, connection with
Metal-oxide-semiconductor Q2 one end and resistance R7 have the resistance R4 at end, are connected to the SMB DATA ends of the resistance R4 other ends, are series at MOS
Resistance R5 on the pipe Q2 other ends, is connected to metal-oxide-semiconductor Q2 and the electric capacity C4 at the shared end of resistance R5 intersections, is connected to electric capacity C4
On SMB DATA R ends；When the SMB_CLK signals of the 3.3V level of part main control chip circuit output, by metal-oxide-semiconductor Q1, lead to
Cross resistance R3 and be pulled upward to 5V level, 5V level is raised；As the SMB_DATA of the 3.3V level of part main control chip circuit output
Signal, by metal-oxide-semiconductor Q2,5V level is pulled upward to by resistance R5,5V level is raised.While metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2 S poles
There is one-way conduction effect with D poles two ends, it is therefore prevented that 5V power supplys pour in down a chimney to 3.3V power supplys, protect part main control chip circuit；
The rise of industrial computer mainboard SMBUS bus levels is met by external equipment demand by such a simpler hardware circuit realiration
Purpose, so that circuit structure is simple, cost is low, highly versatile.
Above by reference to preferred embodiment of the present utility model has been illustrated, not thereby limit to right of the present utility model
Scope.Those skilled in the art do not depart from any modification made in scope and spirit of the present utility model, equivalent substitution and changed
Enter, all should be within interest field of the present utility model.
Claims (3)
1. a kind of low cost simple SMBUS bus level change-over circuits, it includes part main control chip circuit, connector interface electricity
Road；It is characterized in that：It is provided with and makees for switching levels between described part main control chip circuit and connector interface circuit
SMBUS signal level conversion circuits, the SMBUS signal levels conversion circuit includes metal-oxide-semiconductor Q1, metal-oxide-semiconductor Q2；It is connected in parallel
Resistance R6 in metal-oxide-semiconductor Q1 two ends, connection has the resistance R2 at end with metal-oxide-semiconductor Q1 one end and resistance R6, is connected to resistance R2
The SMB CLK ends of the other end, are series at the resistance R3 on the metal-oxide-semiconductor Q1 other ends, are connected to metal-oxide-semiconductor Q1 and resistance R3 intersections
The electric capacity C3 at shared end, is connected to the SMB CLK R ends on electric capacity C3；The resistance R7 at metal-oxide-semiconductor Q2 two ends is connected in parallel in, is connected
The resistance R4 at end is had with metal-oxide-semiconductor Q2 one end and resistance R7, the SMB DATA ends of the resistance R4 other ends is connected to, is series at
Resistance R5 on the metal-oxide-semiconductor Q2 other ends, is connected to metal-oxide-semiconductor Q2 and the electric capacity C4 at the shared end of resistance R5 intersections, is connected to electricity
Hold the SMB DATA R ends on C4；When the SMB_CLK signals of the 3.3V level of part main control chip circuit output, by metal-oxide-semiconductor
Q1,5V level is pulled upward to by resistance R3, and 5V level is raised；As the SMB_ of the 3.3V level of part main control chip circuit output
DATA signal, by metal-oxide-semiconductor Q2,5V level is pulled upward to by resistance R5,5V level is raised.
2. a kind of low cost simple SMBUS bus level change-over circuits according to claim 1, it is characterised in that：It is described
Part main control chip circuit includes chip U1, is connected to the SMB DATA ends of chip U1 sides, SMB_CLK ends；Parallel connection is even
The resistance R1 on chip U1, electric capacity C2 are connected to,；It is connected to the electric capacity C1 of resistance R1 one end.
3. a kind of low cost simple SMBUS bus level change-over circuits according to claim 1, it is characterised in that：It is described
Connector interface circuit includes SMBUS interface ends, is connected to ESD electrostatic protection devices ES1, ESD in SMBUS interface ends
Electrostatic protection device ES2, is connected to the SMB_CLK_R ends in SMBUS interface ends, SMB_DATA_R ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720032292.6U CN206370825U (en) | 2017-01-12 | 2017-01-12 | A kind of low cost simple SMBUS bus level change-over circuits |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720032292.6U CN206370825U (en) | 2017-01-12 | 2017-01-12 | A kind of low cost simple SMBUS bus level change-over circuits |
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| CN206370825U true CN206370825U (en) | 2017-08-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636741A (en) * | 2020-12-29 | 2021-04-09 | 成都极米科技股份有限公司 | Level conversion circuit and terminal equipment |
-
2017
- 2017-01-12 CN CN201720032292.6U patent/CN206370825U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112636741A (en) * | 2020-12-29 | 2021-04-09 | 成都极米科技股份有限公司 | Level conversion circuit and terminal equipment |
| CN112636741B (en) * | 2020-12-29 | 2023-05-23 | 成都极米科技股份有限公司 | Level conversion circuit and terminal equipment |
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