CN209184484U - A kind of electric bicycle cpu i/f incoming signal level conversion circuit - Google Patents
A kind of electric bicycle cpu i/f incoming signal level conversion circuit Download PDFInfo
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- CN209184484U CN209184484U CN201821814530.XU CN201821814530U CN209184484U CN 209184484 U CN209184484 U CN 209184484U CN 201821814530 U CN201821814530 U CN 201821814530U CN 209184484 U CN209184484 U CN 209184484U
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Abstract
The utility model provides a kind of electric bicycle cpu i/f incoming signal level conversion circuit, including input terminal RX, output end U1RX, resistance R42, R47 and R48 and diode D12 and D13, resistance R47 and R48 are connected between input terminal RX and ground, and the one end resistance R47 connects input terminal RX, diode D13 is connected in parallel on the both ends resistance R48, and the plus earth of diode D13, the common end of the connection of diode D12 cathode resistance R47 and R48, diode D12 anode connects output end U1RX, and the one end resistance R42 connects the 3.3V power supply other end and connects output end U1RX.The utility model plays buffer action using diode cut-off, and avoiding and causing the voltage value of 3.3V power supply is more than 3.3V, stablizes the output of 3.3V power supply；Meanwhile moment impact is generated to cpu i/f using TVS pipe and is protected, to form bidirectional protective effect.
Description
Technical field
The utility model relates to signal level shift circuit technical fields, connect more particularly to a kind of electric bicycle CPU
Mouth incoming signal level conversion circuit.
Background technique
The electric control part of electric bicycle includes appliance circuit and peripheral control unit, in normal work, appliance circuit CPU
Communicated with peripheral control unit, but the level of CPU be 3.3V, and the level of peripheral control unit be 5V, therefore, the two into
It needs to carry out level conversion when row communication, the identification that otherwise can not carry out signal is read.When peripheral control unit signal is input to CPU
When, it needs to carry out the conversion of signal level, 5V level signal is converted into 3.3V level signal.
As shown in Figure 1, existing level conversion mode can use the clamped effect of diode D, it is by 5V level conversion
3.3V level still, can be by diode D to 3.3V mains input current when using this circuit, may if electric current is excessively high
Making 3.3V supply voltage value is more than 3.3V.
Utility model content
The technical problem to be solved by the utility model is in order to overcome the shortcomings in the prior art, the utility model mentions
For a kind of electric bicycle CPU incoming signal level conversion circuit.
The utility model solves its technical problem technical solution to be taken: a kind of electric bicycle cpu i/f is defeated
Enter signal level shift circuit, including input terminal RX, output end U1RX, three resistance R42, R47 and R48 and two diodes
D12 and D13, the resistance R47 and R48 are connected between input terminal RX and ground, and the one end resistance R47 connect input terminal RX, two
Pole pipe D13 is connected in parallel on the both ends resistance R48, and the plus earth of diode D13, and the cathode of the diode D12 connects resistance R47
With the common end of R48, the anode of diode D12 connects output end U1RX, and the one end the resistance R42 connects the 3.3V power supply other end
Connecting output end U1RX, wherein input terminal RX connection external signal, output end U1RX connection CPU, resistance R42 are pull-up resistor,
Resistance R47 is current-limiting resistance.
When the signal of input terminal RX input 5V high level, since diode D12 reversely ends, output end U1RX output
3.3V level；When the signal of input terminal RX input low level, diode D12 forward conduction, output end U1RX passes through diode
D12 and TVS diode D13 are connected to the ground, and output end U1RX exports low level signal, will be externally input by diode D12
5V high level is converted into be exported with the matched 3.3V level of CPU level.
Preferably, the diode D12 uses the zener diode of model LL4148.
Preferably, the diode D13 uses the TVS Transient Suppression Diode of model SMAJ5.0A.As input terminal RX
When input low level, if the end CPU generate moment impact, can by diode D13 by voltage stabilization in 0.7V range, play
Protective effect；When input is low level, the low level signal of output can be made more stable by resistance R48 ground connection.
The beneficial effects of the utility model are: a kind of electric bicycle cpu i/f input signal provided by the utility model
Level shifting circuit plays buffer action using diode cut-off, and avoiding and causing the voltage value of 3.3V power supply is more than 3.3V, is made
The output of 3.3V power supply is stablized；Meanwhile moment impact is generated to cpu i/f using TVS pipe and is protected, to form two-way guarantor
Shield effect.
Detailed description of the invention
The utility model is described in further detail with reference to the accompanying drawings and examples.
Fig. 1 is the schematic illustration that the prior art realizes level conversion using diode clamping.
Fig. 2 is the schematic illustration of the best embodiment of the utility model.
Specific embodiment
The utility model is described in detail presently in connection with attached drawing.This figure is simplified schematic diagram, only in a schematic way
Illustrate the basic structure of the utility model, therefore it only shows composition related with the utility model.
As shown in Fig. 2, a kind of electric bicycle cpu i/f incoming signal level conversion circuit of the utility model, including
Input terminal RX, output end U1RX, three resistance R42, R47 and R48 and two diode D12 and D13, the resistance R47 and
R48 is connected between input terminal RX and ground, and the one end resistance R47 connects input terminal RX, and diode D13 is connected in parallel on resistance R48 two
End, and the plus earth of diode D13, the common end of cathode connection the resistance R47 and R48 of the diode D12, diode
The anode of D12 connects output end U1RX, and the one end the resistance R42 connects the 3.3V power supply other end and connects output end U1RX, wherein
Input terminal RX connection external signal, output end U1RX connection cpu i/f, resistance R42 are pull-up resistor, and resistance R47 is limited galvanic electricity
Resistance.
When the signal of input terminal RX input 5V high level, since diode D12 reversely ends, output end U1RX output
3.3V level；When the signal of input terminal RX input low level, diode D12 forward conduction, output end U1RX exports low level
Signal is converted externally input 5V high level to by diode D12 and exported with the matched 3.3V level of CPU level.
Preferably, the diode D12 uses the zener diode of model LL4148.
The diode D13 described in the circuit uses the TVS Transient Suppression Diode of model SMAJ5.0A.When input terminal RX is defeated
When entering low level, if the end CPU generate moment impact, can by diode D13 by voltage stabilization in 0.7V range, play guarantor
Shield effect；When input is low level, the low level signal of output can be made more stable by resistance R48 ground connection.In addition, adopting
Buffer action is played with diode D12 cut-off, the voltage value for avoiding 3.3V power supply is more than 3.3V, keeps the output of 3.3V power supply steady
It is fixed；Meanwhile moment impact is generated to cpu i/f using TVS diode D13 and is protected, to form two-way protective effect.
It is enlightenment, through the above description, relevant work with the above-mentioned desirable embodiment according to the utility model
Personnel can carry out various changes and amendments in without departing from the scope of the utility model completely.This item utility model
Technical scope is not limited to the contents of the specification, it is necessary to which the technical scope thereof is determined according to the scope of the claim.
Claims (3)
1. a kind of electric bicycle cpu i/f incoming signal level conversion circuit, it is characterised in that: including input terminal RX, output
U1RX, three resistance R42, R47 and R48 and two diode D12 and D13, the resistance R47 and R48 are held to be connected on input
It holds between RX and ground, and the one end resistance R47 connects input terminal RX, diode D13 is connected in parallel on the both ends resistance R48, and diode D13
Plus earth, the diode D12 cathode connection resistance R47 and R48 common end, diode D12 anode connection it is defeated
Outlet U1RX, the one end the resistance R42 connect the 3.3V power supply other end and connect output end U1RX.
2. electric bicycle cpu i/f incoming signal level conversion circuit as described in claim 1, it is characterised in that: described
Diode D12 uses the zener diode of model LL4148.
3. electric bicycle cpu i/f incoming signal level conversion circuit as described in claim 1, it is characterised in that: described
Diode D13 uses the Transient Suppression Diode of model SMAJ5.0A.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821814530.XU CN209184484U (en) | 2018-11-05 | 2018-11-05 | A kind of electric bicycle cpu i/f incoming signal level conversion circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821814530.XU CN209184484U (en) | 2018-11-05 | 2018-11-05 | A kind of electric bicycle cpu i/f incoming signal level conversion circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209184484U true CN209184484U (en) | 2019-07-30 |
Family
ID=67363337
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821814530.XU Active CN209184484U (en) | 2018-11-05 | 2018-11-05 | A kind of electric bicycle cpu i/f incoming signal level conversion circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209184484U (en) |
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2018
- 2018-11-05 CN CN201821814530.XU patent/CN209184484U/en active Active
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