CN204440388U - A kind of easy data transmission circuit - Google Patents
A kind of easy data transmission circuit Download PDFInfo
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- CN204440388U CN204440388U CN201420661517.0U CN201420661517U CN204440388U CN 204440388 U CN204440388 U CN 204440388U CN 201420661517 U CN201420661517 U CN 201420661517U CN 204440388 U CN204440388 U CN 204440388U
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Abstract
The utility model provides a kind of easy data transmission circuit, comprises the first communication device, the second communication device, communication line, division module, metal-oxide-semiconductor bidirectional data transfers module, power module.Described communication line comprises clock cable SCL, data line SDA, and power module comprises the first power supply VCC_A, second source VCC_B.One end SCL_A of described clock cable SCL is connected with the first communication device, other end SCL_B is connected with the second communication device, described division module is connected between the SCL_A end of clock cable SCL and SCL_B end, one end SDA_A of described data line SDA is connected with the first communication device, other end SDA_B is connected with the second communication device, and described metal-oxide-semiconductor bidirectional data transfers module is connected between the SDA_A end of data line SDA and SDA_B end; Described first communication device is connected with the first power supply VCC_A, and described second communication device is connected with second source VCC_B.Adopt division module and metal-oxide-semiconductor bidirectional data transfers module to replace the application of high-speed isolated optocoupler, economize on resources, reduced volume.
Description
Technical field
The utility model relates to a kind of circuit, particularly relates to a kind of easy data transmission circuit.
Technical background
Communication now between many first communication devices (master devices) and the second communication device all uses I
2c bus, I
2c bus is the universal serial bus be made up of data line SDA and clock cable SCL, can transmit and receive data, and between CPU and controlled IC, carries out two-way transmission between IC and IC.When the first communication device and the second communication device use different electrical power voltage (VCC_A and VCC_B), generally contact the communication between them by employing high-speed isolated optocoupler, as shown in Figure 1, Fig. 1 is a kind of data transmission circuit schematic diagram of prior art, and this circuit comprises the first communication device 1, second communication device 2, I
2c bus, power module 5, isolated transmission module 6, first communication device 1 and the second communication device 2 pass through I
2c bus carries out communication, and the first communication device 1 and the second communication device 2 use different electrical power voltage (VCC_A and VCC_B), adopts high-speed isolated optocoupler ADUM1250 chip to contact communication between them by isolated transmission module 6.But high-speed isolated optocoupler is expensive and volume large, be difficult to meet the demand that in producing, low cost volume is little.
Utility model content
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art, provides a kind of easy data transmission circuit, utilizes ball bearing made using, substitute the application of high-speed isolated optocoupler, economize on resources, reduced volume.
The technical solution of the utility model is as follows: a kind of easy data transmission circuit, is characterized in that, comprise the first communication device, the second communication device, communication line, division module, metal-oxide-semiconductor bidirectional data transfers module, power module; Described communication line comprises clock cable SCL, data line SDA, and power module comprises the first power supply VCC_A, second source VCC_B;
One end SCL_A of described clock cable SCL is connected with the first communication device, and other end SCL_B is connected with the second communication device, and described division module is connected between the SCL_A end of clock cable SCL and SCL_B end; One end SDA_A of described data line SDA is connected with the first communication device, and other end SDA_B is connected with the second communication device, and described metal-oxide-semiconductor bidirectional data transfers module is connected between the SDA_A end of data line SDA and SDA_B end; Described first communication device is connected with the first power supply VCC_A, and the second described communication device is connected with second source VCC_B.
Further, described division module comprises resistance R1, resistance R2; One end of described resistance R1 and the SCL_A of clock cable SCL hold and are connected to the first communication device, the other end of described resistance R1 is connected with one end of described resistance R2, the other end ground connection of described resistance R2, the link of described resistance R1, resistance R2 and the SCL_B of clock cable SCL hold and are connected to the second communication device.
Further, described metal-oxide-semiconductor bidirectional data transfers module comprises NMOS tube Q1, resistance R3, resistance R4, resistance R5;
The grid of described NMOS tube Q1 is by being connected with second source VCC_B by resistance R3, the source electrode of described NMOS tube Q1 is connected with second source VCC_B by resistance R4, the source electrode of described NMOS tube Q1 is also held with the SDA_B of data line SDA and is connected to the second communication device, the drain electrode of described NMOS tube Q1 is connected with the first power supply VCC_A by resistance R5, and the drain electrode of described NMOS tube Q1 is also held with the SDA_A of data line SDA and is connected to the first communication device.
The beneficial effects of the utility model are: provide a kind of easy data transmission circuit, adopt division module and metal-oxide-semiconductor bidirectional data transfers module to replace the application of high-speed isolated optocoupler, economize on resources, reduced volume.
Accompanying drawing explanation
Fig. 1 is a kind of data transmission circuit schematic diagram of prior art;
Fig. 2 is a kind of easy data transmission circuit block diagram of the utility model;
Fig. 3 is a kind of easy data transmission circuit schematic diagram of the utility model embodiment.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the utility model is further described.Should be appreciated that specific embodiment described herein only for explaining the utility model, and be not used in restriction the utility model.
Be a kind of easy data transmission circuit block diagram of the utility model with reference to figure 2, Fig. 2, this circuit comprises the first communication device 1, second communication device 2, communication line, division module 3, metal-oxide-semiconductor bidirectional data transfers module 4, power module 5.The peripheral intelligent chip that general first communication device 1 is master devices, the second communication device 2 is master devices, master devices and peripheral intelligent chip adopt the Power supply of different voltage, division module 3 and metal-oxide-semiconductor bidirectional data transfers module 4 are connected to therebetween, both realizations communication.
In the present embodiment, between master devices and peripheral intelligent chip, communication line adopts I
2c bus form.I
2c bus is made up of clock cable SCL, data line SDA, and master devices 1 adopts that 5V power supply VCC_A powers, peripheral intelligent chip adopts 3.3V power supply VCC_B to power.One end SCL_A of clock cable SCL is connected with master devices 1, and other end SCL_B is connected with peripheral intelligent chip 2; Division module 3 is connected between the SCL_A end of clock cable SCL and SCL_B end; One end SDA_A of data line SDA is connected with master devices 1, and other end SDA_B is connected with peripheral intelligent chip 2, and metal-oxide-semiconductor bidirectional data transfers module 4 is connected between the SDA_A end of data line SDA and SDA_B end.
Shown in figure 3, Fig. 3 is a kind of easy data transmission circuit schematic diagram of the utility model embodiment.Wherein, division module 2 is in series by resistance R1, resistance R2; One end of described resistance R1 and the SCL_A of clock cable SCL hold and are connected to master devices 1, the other end of described resistance R1 is connected with one end of described resistance R2, the other end ground connection of described resistance R2, the link of described resistance R1, resistance R2 and the SCL_B of clock cable SCL hold and are connected to peripheral intelligent chip 2.Clock line SCL exports through the first power supply VCC_A power supply chip port of 5V, and after dividing potential drop, obtain VCC_B and amplitude is that the clock signal of 3.3V is connected to peripheral intelligent chip, and the low and high level of such clock signal is completely corresponding.
Described metal-oxide-semiconductor bidirectional data transfers module 4 comprises NMOS tube Q1, resistance R3, resistance R4, resistance R5; The grid of described NMOS tube Q1 is by being connected with second source VCC_B by resistance R3, the source electrode of described NMOS tube Q1 is connected with second source VCC_B by resistance R4, the source electrode of described NMOS tube Q1 is also held with the SDA_B of data line SDA and is connected to peripheral intelligent chip 2, the drain electrode of described NMOS tube Q1 is connected with the first power supply VCC_A by resistance R5, and the drain electrode of described NMOS tube Q1 is also held with the SDA_A of data line SDA and is connected to master devices 1.
Present metal-oxide-semiconductor great majority have diode-built-in, channel resistance can be selected little, the NMOS tube that the switching response time is fast in the utility model.When SDA_B holds low level, metal-oxide-semiconductor conducting, SDA_A end is also connected to low level; When SDA_B holds high level, metal-oxide-semiconductor not conducting, SDA_B end also keeps high level because pull-up resistor R5 exists, and achieves the level transmissions that SDA_B holds SDA_A to hold.When SDA_A holds low level, because of the existence of metal-oxide-semiconductor internal body diodes, SDA_B terminal voltage can drag down and cause metal-oxide-semiconductor conducting, thus allows SDA_B end be connected to low level; When SDA_A holds high level, internal body diodes can not drag down SDA2 terminal voltage, metal-oxide-semiconductor not conducting, and SDA_B end also keeps high level because pull-up resistor exists, and achieves the level transmissions that SDA_A holds SDA_B to hold.
Therefore, division module and metal-oxide-semiconductor bidirectional data transfers module can replace high-speed isolated optocoupler to apply, and economize on resources, reduced volume.
Obviously, above-described embodiment of the present utility model is only for the utility model example is clearly described, and is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.All do within spirit of the present utility model and principle any amendment, equivalent to replace and improvement etc., within the protection domain that all should be included in the utility model claim.
Claims (3)
1. an easy data transmission circuit, is characterized in that, comprises the first communication device, the second communication device, communication line, division module, metal-oxide-semiconductor bidirectional data transfers module, power module; Described communication line comprises clock cable SCL, data line SDA, and power module comprises the first power supply VCC_A, second source VCC_B;
One end SCL_A of described clock cable SCL is connected with the first communication device, and other end SCL_B is connected with the second communication device, and described division module is connected between the SCL_A end of clock cable SCL and SCL_B end; One end SDA_A of described data line SDA is connected with the first communication device, and other end SDA_B is connected with the second communication device, and described metal-oxide-semiconductor bidirectional data transfers module is connected between the SDA_A end of data line SDA and SDA_B end; Described first communication device is connected with the first power supply VCC_A, and described second communication device is connected with second source VCC_B.
2. the easy data transmission circuit of one according to claim 1, is characterized in that, described division module comprises resistance R1, resistance R2;
One end of described resistance R1 and the SCL_A of clock cable SCL hold and are connected to the first communication device, the other end of described resistance R1 is connected with one end of described resistance R2, the other end ground connection of described resistance R2, the link of described resistance R1, resistance R2 and the SCL_B of clock cable SCL hold and are connected to the second communication device.
3. the easy data transmission circuit of one according to claim 1, is characterized in that, described metal-oxide-semiconductor bidirectional data transfers module comprises NMOS tube Q1, resistance R3, resistance R4, resistance R5;
The grid of described NMOS tube Q1 is by being connected with second source VCC_B by resistance R3, the source electrode of described NMOS tube Q1 is connected with second source VCC_B by resistance R4, the source electrode of described NMOS tube Q1 is also held with the SDA_B of data line SDA and is connected to the second communication device, the drain electrode of described NMOS tube Q1 is connected with the first power supply VCC_A by resistance R5, and the drain electrode of described NMOS tube Q1 is also held with the SDA_A of data line SDA and is connected to the first communication device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661517.0U CN204440388U (en) | 2014-11-07 | 2014-11-07 | A kind of easy data transmission circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420661517.0U CN204440388U (en) | 2014-11-07 | 2014-11-07 | A kind of easy data transmission circuit |
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| CN204440388U true CN204440388U (en) | 2015-07-01 |
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| CN201420661517.0U Active CN204440388U (en) | 2014-11-07 | 2014-11-07 | A kind of easy data transmission circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378100A (en) * | 2014-11-07 | 2015-02-25 | 惠州市亿能电子有限公司 | Communication circuit |
| CN107678999A (en) * | 2017-10-25 | 2018-02-09 | 东莞博力威电池有限公司 | A kind of I2C isolation circuits |
-
2014
- 2014-11-07 CN CN201420661517.0U patent/CN204440388U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378100A (en) * | 2014-11-07 | 2015-02-25 | 惠州市亿能电子有限公司 | Communication circuit |
| CN107678999A (en) * | 2017-10-25 | 2018-02-09 | 东莞博力威电池有限公司 | A kind of I2C isolation circuits |
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