CN207069903U - A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits - Google Patents
A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits Download PDFInfo
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- CN207069903U CN207069903U CN201720891812.9U CN201720891812U CN207069903U CN 207069903 U CN207069903 U CN 207069903U CN 201720891812 U CN201720891812 U CN 201720891812U CN 207069903 U CN207069903 U CN 207069903U
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Abstract
It the utility model is related to electronics field.A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits, the TX_5V electrodes of Transistor-Transistor Logic level are linked in sequence first resistor R1, the first triode Q1 base stage B, the first triode Q1 colelctor electrode C, second resistance R2, the RX_3.3V electrodes of the 4th resistance R4, CMOS level, the first triode Q1 colelctor electrode C be linked in sequence 3rd resistor R3, the second diode Q2 base stage B, the second diode Q2 colelctor electrode C, CMOS level RX_3.3V electrodes.The beneficial effects of the utility model are：When solving different chips and use serial communication, the unmatched problem of level.
Description
Technical field
It the utility model is related to electronics field.
Background technology
In semiconductor circuit, lower voltage, lower power consumption is typically represented, then with the hair of semiconductor technology
Exhibition, CMOS level（3.3V）Component Transistor-Transistor Logic level substituted greatly（5V）Trend.However, in real work, in fact it could happen that
The situation that Transistor-Transistor Logic level and CMOS level chip hybrids use, it is at this time, inconsistent due to voltage, segment chip may be caused
Made mistakes when carrying out high speed communication, or even burn the low-voltage chip of 3.3V CMOS level.It is 5V TTL in STC10F80XE
Level, MT7628AN are 3.3V CMOS level, and when the two progress serial communication, some circuits directly connect in serial ports
A resistance of being connected on line is used for protecting chip not to be burned out.But this simple and crude safeguard measure is not healthy and strong.
Utility model content
Technical problem to be solved in the utility model is：How in Transistor-Transistor Logic level and CMOS level chip hybrid in use,
Avoid output voltage inconsistent.
Technical scheme is used by the utility model：A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits, TTL electricity
Flat TX_5V electrodes are linked in sequence first resistor R1, the first triode Q1 base stage B, the first triode Q1 colelctor electrode C,
Two resistance R2, the 4th resistance R4, CMOS level RX_3.3V electrodes, the first triode Q1 colelctor electrode C are linked in sequence the 3rd electricity
Hinder R3, the second diode Q2 base stage B, the second diode Q2 colelctor electrode C, CMOS level RX_3.3V electrodes, CMOS level
RX_3.3V electrodes be linked in sequence the 5th resistance R5, the 3rd triode Q1 base stage B, the 3rd triode Q1 colelctor electrode C,
Six resistance R6, the 8th resistance R8, the RX_5V electrodes of Transistor-Transistor Logic level, the 3rd triode Q1 colelctor electrode C are linked in sequence the 7th resistance
R7, the 4th diode Q4 base stage B, the 4th diode Q4 colelctor electrode C, the RX_5V electrodes of Transistor-Transistor Logic level, all diodes
Emitter E is all grounded.Output+3.3V between second resistance R2 and the 4th resistance R4, between the 6th resistance R6 and the 8th resistance R8
Output+5V.
As a kind of preferred embodiment：Transistor-Transistor Logic level is STC10F80XE, and CMOS level is MT7628AN.
The beneficial effects of the utility model are：When solving different chips and use serial communication, level is unmatched to ask
Topic.
Brief description of the drawings
Fig. 1 is electrical block diagram of the present utility model.
Embodiment
As shown in figure 1, the present embodiment is said so that STC10F80XE chips and MT7628AN chips gang up communication as an example
It is bright.
STC10F80XE chips are the chips of Transistor-Transistor Logic level, the TX_5V pins of the chip（Electrode）, with the first triode Q1
Base stage B between connect first resistor R1, the first triode Q1 emitter E ground connection.First triode Q1 colelctor electrode C passes through
Second resistance R2 is connected to+3.3V voltages, and the 3rd resistor R3 that connected with the second triode Q2 base stage B；Second triode Q2
Emitter E ground connection, the second triode Q2 colelctor electrode C is connected to+3.3V voltages by the 4th resistance R4, and is connected to
The RX_3.3V pins of MT7628AN chips（Electrode）；
Control chip MT7628AN TX_3.3V pins（Electrode）, connect between the 3rd triode Q3 base stage B
Five resistance R5；3rd triode Q3 emitter E ground connection.3rd triode Q3 colelctor electrode C is connected to by the 6th resistance R6+
5V voltages, and the 7th resistance R7 that connected with the 4th triode Q4 base stage B；4th triode Q4 emitter E ground connection；Four or three
Pole pipe Q4 colelctor electrode C is connected to the RX_5V pins of STC10F80XE chips（Electrode）.
Preferably, the resistance of all resistance is all 47k ohms.
The TX_5V output signals " height " of STC10F80XE chips, TX_5V voltages are+5V, and Q1 base stage B is also+5V, Q1
The colelctor electrode B voltage 0V of saturation conduction, then Q1, then Q2 base stage B is 0V, and then Q2 ends, then Q2 colelctor electrode C quilts
R4 is pulled upward to+3.3V, and the RX_3.3V of MT7628AN chips receives signal " height ".The TX_5V of STC10F80XE chips is realized,
Transmission to the RX_3.3V signals " height " of MT7628AN chips.
The TX_5V output signals " low " of STC10F80XE chips, TX_5V voltages are 0V, and then Q1 base stage is 0V, then
Q1 ends, and then Q1 colelctor electrode is pulled upward to+3.3V by R2, and then Q2 base stage is also+3.3V, Q2 saturation conductions, then Q2
C be 0V, the RX_3.3V of MT7628AN chips receives signal " height ".The TX_5V of STC10F80XE chips is realized, to
The transmission of the RX_3.3V signals " low " of MT7628AN chips.
The TX_3.3V output signals " height " of MT7628AN chips, TX_3.3V voltages are+3.3V, Q3 base stage is also+
The collector voltage 0V of 3.3V, Q3 saturation conduction, then Q3, then Q4 base stage is 0V, and then Q4 ends, then Q4 current collection
Pole is pulled upward to+5V by R8, and the RX_5V of STC10F80XE chips receives signal " height ".Realize the TX_ of MT7628AN chips
3.3V, the transmission to the RX_5V signals " height " of STC10F80XE chips.
The TX_3.3V output signals " low " of MT7628AN chips, TX_3.3V voltages are 0V, and then Q3 base stage is 0V, in
It is Q3 cut-offs, then Q3 colelctor electrode is pulled upward to+5V by R6, and then Q4 base stage is also+5V, the C of Q4 saturation conductions, then Q4
Signal " height " is received for 0V, the RX_5V of STC10F80XE chips.The TX_3.3V of MT7628AN chips is realized, to
The transmission of the RX_5V signals " low " of STC10F80XE chips.
Claims (2)
1. a kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits, it is characterised in that：The TX_5V electrodes of Transistor-Transistor Logic level are linked in sequence
First resistor R1, the first triode Q1 base stage B, the first triode Q1 colelctor electrode C, second resistance R2, the 4th resistance R4,
The RX_3.3V electrodes of CMOS level, the first triode Q1 colelctor electrode C are linked in sequence 3rd resistor R3, the second diode Q2
Base stage B, the second diode Q2 colelctor electrode C, CMOS level RX_3.3V electrodes, CMOS level RX_3.3V electrodes order connect
Connect the 5th resistance R5, the 3rd triode Q1 base stage B, the 3rd triode Q1 colelctor electrode C, the 6th resistance R6, the 8th resistance R8,
The RX_5V electrodes of Transistor-Transistor Logic level, the 3rd triode Q1 colelctor electrode C are linked in sequence the 7th resistance R7, the 4th diode Q4 base stage
B, the RX_5V electrodes of the 4th diode Q4 colelctor electrode C, Transistor-Transistor Logic level, the emitter E of all diodes are all grounded.
2. a kind of serial ports Transistor-Transistor Logic level according to claim 1 and CMOS electrical level matching circuits, it is characterised in that：Transistor-Transistor Logic level
For STC10F80XE, CMOS level is MT7628AN.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720891812.9U CN207069903U (en) | 2017-07-21 | 2017-07-21 | A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201720891812.9U CN207069903U (en) | 2017-07-21 | 2017-07-21 | A kind of serial ports Transistor-Transistor Logic level and CMOS electrical level matching circuits |
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| CN207069903U true CN207069903U (en) | 2018-03-02 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412911A (en) * | 2019-07-15 | 2019-11-05 | 广东爱美信电器有限公司 | A kind of serial communication electrical level matching circuit and intelligence control system |
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2017
- 2017-07-21 CN CN201720891812.9U patent/CN207069903U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412911A (en) * | 2019-07-15 | 2019-11-05 | 广东爱美信电器有限公司 | A kind of serial communication electrical level matching circuit and intelligence control system |
| CN110412911B (en) * | 2019-07-15 | 2024-04-05 | 广东爱美信电器有限公司 | Serial port communication level matching circuit and intelligent control system |
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