CN207704429U - A kind of switching circuit and terminal device - Google Patents
A kind of switching circuit and terminal device Download PDFInfo
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- CN207704429U CN207704429U CN201721687148.2U CN201721687148U CN207704429U CN 207704429 U CN207704429 U CN 207704429U CN 201721687148 U CN201721687148 U CN 201721687148U CN 207704429 U CN207704429 U CN 207704429U
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Abstract
The utility model is suitable for Bluetooth technology field, provides a kind of switching circuit and terminal device, including usb interface module, switching control module and charging module.Switching circuit provided by the utility model connects the connection between usb interface module and charging module when needing to realize external charge function by switching control module, is exterior terminal equipment charge by usb interface module；When needing to realize online upgrading function, the connection between usb interface module and ROM bluetooth modules is connected by switching control module, upgrading data, which are inputted, by usb interface module upgrades ROM bluetooth modules, online upgrading and external charge function only can be realized by a usb interface module simultaneously, it is simple in structure, it is of low cost.
Description
Technical field
The utility model belongs to Bluetooth technology field more particularly to a kind of switching circuit and terminal device.
Background technology
With the development of Bluetooth technology, bluetooth applications have various effect in more and more aspects.
Bluetooth realizes that external charge function is generally to connect charging port by a USB interface to realize, bluetooth rises online
Grade needs to power on by another USB interface, carries out online upgrading work into bluetooth online upgrading pattern, bluetooth is simultaneously
Realize that externally charging then needs two USB interfaces with two functions of online upgrading, complicated, cost is larger.
Utility model content
The purpose of this utility model is to provide a kind of switching circuit and terminal devices, it is intended to solve traditional technical solution
Present in bluetooth simultaneously realize externally charging with two functions of online upgrading then need two USB interfaces, complicated, cost
Larger problem.
The first aspect of the utility model embodiment provides a kind of switching circuit, including usb interface module, switching control
Module and charging module；
First input and output of the usb interface module terminate exterior terminal equipment, and the second of the usb interface module is defeated
Enter the first input/output terminal that output terminates the switching control module, the second input and output termination of the switching control module
ROM bluetooth modules, the input of the charging module terminate the ROM bluetooth modules, described in the output termination of the charging module
The input terminal of switching control module；
The switching control module connects the USB according to the first switch-over control signal that the ROM bluetooth modules export
Connection between the second input/output terminal and the output end of the charging module of interface module, passes through the usb interface module
The first input/output terminal be the exterior terminal equipment charge；
The switching control module connects the USB according to the second switch-over control signal that the ROM bluetooth modules export
Connection between second input/output terminal of interface module and the ROM bluetooth modules, passes through the first of the usb interface module
Input/output terminal input upgrading data upgrade the ROM bluetooth modules.
The switching control module includes switch control unit, the first input/output terminal of the switch control unit,
Two input/output terminals and input terminal respectively with the first input/output terminal of the switching control module, the second input/output terminal and defeated
Enter end to correspond；
The switch control unit connects the USB according to the first switch-over control signal that the ROM bluetooth modules export
Connection between the second input/output terminal and the output end of the charging module of interface module；
The switch control unit connects the USB according to the second switch-over control signal that the ROM bluetooth modules export
Connection between second input/output terminal of interface module and the ROM bluetooth modules.
The switching control module further includes first resistor, second resistance, 3rd resistor, the 4th resistance and the 5th resistance；
First input/output terminal of the switch control unit includes that the first input and output anode and the first input and output are negative
The second input that end, the first input and output anode and the first input and output negative terminal connect the usb interface module is defeated
Outlet；
Second input/output terminal of the switch control unit include switch-over control signal input terminal, the second input and output just
End and the second input and output negative terminal, the switch-over control signal input terminal connect the ROM bluetooth modules by the first resistor,
The second input and output anode connects the ROM bluetooth modules by the second resistance, and the second input and output negative terminal is logical
It crosses the 3rd resistor and connects the ROM bluetooth modules；
The input terminal of the switch control unit includes input positive terminal and input negative terminal, and the input positive terminal passes through described
Four resistance connect the output end of the charging module, and the input negative terminal connects the output of the charging module by the 5th resistance
End.
The usb interface module includes usb interface unit, the first input/output terminal of the usb interface unit and second
Input/output terminal is corresponded with the first input/output terminal of the usb interface module and the second input/output terminal respectively；
Pass through the switching control between the second input/output terminal and the output end of charging module of the usb interface unit
When module connects, the first input/output terminal by the usb interface module is the exterior terminal equipment charge.
The usb interface module further includes the 6th resistance and the 7th resistance；
First input/output terminal of the usb interface unit includes that the first input and output anode and the first input and output are negative
End, the first input and output anode and the first input and output negative terminal connect the exterior terminal equipment；
Second input/output terminal of the usb interface unit includes that the second input and output anode and the second input and output are negative
End, second input and output are just terminating one end of the 6th resistance, another termination switching control of the 6th resistance
First input/output terminal of molding block, the second input and output negative terminal connect one end of the 7th resistance, the 7th resistance
Another termination switching control module the first input/output terminal.
The usb interface module further include the first varistor, the second varistor, third varistor, the first capacitance,
Second capacitance, the 8th pull down resistor and the first magnetic bead；
Second input and output are just terminating one end of the 6th resistance, and the other end of the 6th resistance is cut with described
Change the first input/output terminal of control module, first varistor termination first capacitance one end, described the
The other end of one varistor and the other end of first capacitance are connected to ground altogether；
The second input and output negative terminal connects one end of the 7th resistance, is cut described in another termination of the 7th resistance
Change the first input/output terminal of control module, one end and second capacitance of second varistor one end, described
The other end of two varistors and the other end of second capacitance are connected to ground altogether；
The ground terminal of the usb interface unit is grounded by the 8th pull down resistor；
The power supply of the usb interface unit terminates one end of first magnetic bead, another termination of first magnetic bead
One end of one power supply and the third varistor, the other end ground connection of the third varistor.
The charging module includes charhing unit, the output end and input terminal of the charhing unit respectively with the charging mould
The output end and input terminal of block correspond；
Pass through the switching between the output end of the charhing unit and the second input/output terminal of the usb interface module
When control module connects, it is defeated by the first input of the usb interface module that the charhing unit connects the switching control module
Outlet is the exterior terminal equipment charge.
The output end of the charhing unit includes output plus terminal and output negative terminal, and the output plus terminal, output negative terminal connect
The input terminal of the switching control module, the inner ground end ground connection of the charhing unit.
The charging module further include third capacitance, the 9th pull down resistor, the tenth pull down resistor, the 11st pull down resistor,
12nd pull down resistor, the 13rd pull down resistor, the 14th pull down resistor, the 15th pull down resistor, the 16th pull down resistor,
17 pull down resistors, the 18th pull down resistor, the 19th pull down resistor, the 20th pull down resistor, the 21st pull down resistor,
22 pull down resistors, the 4th capacitance and the 5th capacitance；
The logic level selection of the charhing unit terminates one end of the 9th pull down resistor, the 9th pull down resistor
The other end and the tenth pull down resistor, the 11st pull down resistor, the 12nd pull down resistor and the described 13rd
Pull down resistor parallel connection is followed by second source, and the logic level selection end of the charhing unit also connects the 14th pull down resistor one
End, the other end and the 15th pull down resistor, the 16th pull down resistor, the described tenth of the 14th pull down resistor
Seven pull down resistors and the 18th pull down resistor are connected to ground altogether；
The input port of the charhing unit connects the other end of one end and the 9th pull down resistor of the third capacitance,
The third capacitance other end ground connection, the other end and the tenth pull down resistor, the described 11st of the 9th pull down resistor
Pull down resistor, the 12nd pull down resistor and the 13rd pull down resistor parallel connection are followed by the second source；
The switch terminals of the charhing unit are grounded by the 15th pull down resistor；
First logic level input of the charhing unit is grounded by the 16th pull down resistor；
Second logic level input of the charhing unit is grounded by the 17th pull down resistor；
The third logic level input of the charhing unit is grounded by the 18th pull down resistor；
The lower bound stream thresholding end of the charhing unit passes through the 19th pull down resistor and the 20th pull down resistor
It is connected to ground altogether；
The high current limliting thresholding end of the charhing unit is grounded by the 20th pull down resistor；
The state of the charhing unit terminates one end of the 21st pull down resistor, the 21st pull down resistor
The other end and described 22nd pull down resistor one end and the one end for connecing the third capacitance, another termination of third capacitance
Ground；
The failure of the charhing unit terminates the 22nd pull down resistor other end；
The output of the charhing unit terminates described 4th capacitance one end, described 5th capacitance one end and first electricity
Source, the 4th capacitance other end are connected to ground altogether with the 5th capacitance other end.
In addition, the another aspect of the utility model embodiment provides a kind of terminal device, include such as above-mentioned switching electricity
Road.
Switching circuit provided by the utility model is connect when needing to realize external charge function by switching control module
Logical connection between usb interface module and charging module is exterior terminal equipment charge by usb interface module；Needing reality
When present line upgrade function, the connection between usb interface module and ROM bluetooth modules is connected by switching control module, is passed through
Usb interface module input upgrading data upgrade ROM bluetooth modules, can only be realized simultaneously online by a usb interface module
Upgrading and external charge function, it is simple in structure, it is of low cost.
Description of the drawings
Fig. 1 is the switching circuit structural schematic diagram that the utility model embodiment one provides；
Fig. 2 is the circuit diagram for the switching control module that the utility model embodiment two provides；
Fig. 3 is the circuit diagram for the usb interface module that the utility model embodiment three provides；
Fig. 4 is the circuit diagram for the charging module that the utility model embodiment four provides.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Term " comprising " in the specification and claims of the utility model and above-mentioned attached drawing and their any changes
Shape, it is intended that cover and non-exclusive include.Such as process, method or system comprising series of steps or unit, product or
Equipment is not limited to the step of having listed or unit, but further includes the steps that optionally not listing or unit or optional
Ground further includes for the intrinsic other steps of these processes, method, product or equipment or unit.In addition, term " first ", " the
Two " and " third " etc. are for distinguishing different objects, not for description particular order.
Embodiment one
As shown in Figure 1, the present embodiment provides a kind of structural schematic diagrams of switching circuit 100 comprising：Usb interface module
10, switching control module 20, charging module 30 and ROM bluetooth modules 40.
The connection relation for 100 modules of switching circuit that the present embodiment is provided is：
First input and output of the usb interface module 10 terminate exterior terminal equipment, and the of the usb interface module 10
Two input and output terminate the first input/output terminal of the switching control module 20, the second input of the switching control module 20
Output termination ROM bluetooth modules 40, the input of the charging module 30 terminates the ROM bluetooth modules 40, the charging module
30 output terminates the input terminal of the switching control module 20；
Described in the first switch-over control signal that the switching control module 20 is exported according to the ROM bluetooth modules 40 is connected
Connection between the second input/output terminal and the output end of the charging module 30 of usb interface module 10, is connect by the USB
First input/output terminal of mouth mold block 10 is the exterior terminal equipment charge；
The switching control module 20 is exported according to the ROM bluetooth modules 40 described in the connection of second switch-over control signal
Connection between second input/output terminal of usb interface module 10 and the ROM bluetooth modules 40 passes through the USB interface mould
The first input/output terminal input upgrading data of block 10 upgrade the ROM bluetooth modules 40.
Each module operation principle of switching circuit 100 provided in this embodiment is：
Described in the first switch-over control signal that the switching control module 20 is exported according to the ROM bluetooth modules 40 is connected
Connection between the second input/output terminal and the output end of the charging module 30 of usb interface module 10, the charging module
30 receive the first switch-over control signal that the ROM bluetooth modules 40 export, and charging is sent to switching control module hair 20
Signal, the first input/output terminal that charging signals pass through the usb interface module 10 are the exterior terminal equipment charge；
Described in the second switch-over control signal that the switching control module 20 is exported according to the ROM bluetooth modules 40 is connected
Connection between second input/output terminal of usb interface module 10 and the ROM bluetooth modules 40, the ROM bluetooth modules 40
The second switch-over control signal that the ROM bluetooth modules 40 export is received, into online upgrading pattern, the USB interface mould
First input/output terminal of block 10 receives upgrading data, and upgrading data information is sent to the ROM bluetooth modules 40.
Specifically, switching control module 20, charging module 30 connect ROM bluetooth modules 40 by connector.
In a particular application, first switch-over control signal can be high level signal, the second switching control letter
Number can be low level signal.
The present embodiment is connected usb interface module by switching control module and is filled when needing to realize external charge function
Connection between electric module is exterior terminal equipment charge by usb interface module；When needing to realize online upgrading function,
The connection between usb interface module and ROM bluetooth modules is connected by switching control module, is inputted and is risen by usb interface module
Level data upgrades ROM bluetooth modules, only can realize online upgrading and externally charging work(simultaneously by a usb interface module
Can, it is simple in structure, it is of low cost.
Embodiment two
As shown in Fig. 2, in the present embodiment, the circuit diagram of the usb interface module 10 in embodiment one.
As shown in Fig. 2, usb interface module includes usb interface unit 11, the usb interface unit 11 in the present embodiment
The first input/output terminal and the second input/output terminal respectively with the first input/output terminal of the usb interface module 10 and second
Input/output terminal corresponds；
The operation principle for the usb interface module 10 that the utility model embodiment is provided is：
Pass through the switching between the second input/output terminal and the output end of charging module 30 of the usb interface unit 11
When control module 20 connects, the first input/output terminal by the usb interface module 10 is the exterior terminal equipment charge.
Specifically, usb interface module 10 further includes the 6th resistance R6 and the 7th resistance R7；
First input/output terminal of usb interface unit 11 includes the first input and output anode and the first input and output negative terminal,
First input and output anode and the first input and output negative terminal connect exterior terminal equipment；
Second input/output terminal of usb interface unit 11 includes the second input and output anode and the second input and output negative terminal,
Second input and output just one end of the 6th resistance R6 of termination, the first of another termination switching control module 20 of the 6th resistance R6 is defeated
Enter output end, the second input and output negative terminal connects one end of the 7th resistance R7, another termination switching control module of the 7th resistance R7
20 the first input/output terminal.
Specifically, usb interface module 10 further includes the first varistor V1, the second varistor V2, third varistor
V3, the first capacitance C1, the second capacitance C2, the 8th pull down resistor R8 and the first magnetic bead B1；
Second input and output just one end of the 6th resistance R6 of termination, the other end and the switching control module 20 of the 6th resistance R6
The first input/output terminal, the first varistor V1 one termination the first capacitance C1 one end, the first varistor V1's is another
End and the other end of the first capacitance C1 are connected to ground altogether；
Second input and output negative terminal connects one end of the 7th resistance R7, another termination switching control module 20 of the 7th resistance R7
The first input/output terminal, the second varistor V2 one end and the second capacitance C2 one end, the second varistor V2's is another
End and the other end of the second capacitance C2 are connected to ground altogether；
The ground terminal of usb interface unit 11 passes through the 8th pull down resistor R8 ground connection；
The power supply of usb interface unit 11 terminates one end of the first magnetic bead B1, the first power supply of another termination of the first magnetic bead B1
It is grounded with the other end of one end of third varistor V3, third varistor V3.
In a particular application, usb interface unit 11 can realize online upgrading, external charge function by any
Chip or circuit are realized.
In the present embodiment, usb interface unit 11 can be specifically a 6 pin USB interface of USB04AB-1AC types.
Data line positive terminal USB_D+ (No. 2 pins), the data line negative pole end of 6 pin USB interface of USB04AB-1AC types
USB_D- (No. 3 pins) is respectively the second input and output anode of usb interface module, the second input and output negative terminal.
The peripheral circuit of each pin of 6 pin USB interface of the USB04AB-1AC types is as follows：
No. 1 pin (power end VCC) connects one end of the first magnetic bead B1, the first power supply of another termination of the first magnetic bead B1 and
One end of three varistor V3, the other end ground connection of third varistor V3；
No. 2 pins meet one end of the 6th resistance R6, the first power supply of another termination of the 6th resistance R6, the one of the first capacitance C1
The other end ground connection of the one end at end and the first varistor V1, the other end of the first capacitance C1 and the first varistor V1；
No. 3 pins meet one end of the 7th resistance R7, the first power supply of another termination of the 7th resistance R7, the one of the second capacitance C1
The other end ground connection of the one end at end and the second varistor V2, the other end of the second capacitance C2 and the second varistor V2；
No. 4 pins (ground terminal), No. 5 pins (ground terminal), No. 6 pins (ground terminal) are connect by the 8th pull down resistor R8
Ground.
In the present embodiment, the first magnetic bead B1 can be specifically a PBY160808T-301Y-N lamination sheet type ferrite
Magnetic bead.
The present embodiment carries out externally charging by usb interface unit, carries out upgrading data transmission by USB interface so that
Externally charging and two functions of online upgrading are only realized by a USB.
Embodiment three
As shown in figure 3, in the present embodiment, the switching control module 20 in embodiment one includes switch control unit 21,
The first input/output terminal, the second input/output terminal and the input terminal of switch control unit 21 respectively with switching control module 20
One input/output terminal, the second input/output terminal and input terminal correspond.
The operation principle for the switch control unit 21 that the present embodiment is provided is：
Switch control unit 21 connects usb interface module according to the first switch-over control signal that ROM bluetooth modules 40 export
Connection between 10 the second input/output terminal and the output end of charging module 30；
Switch control unit 21 connects usb interface module according to the second switch-over control signal that ROM bluetooth modules 40 export
Connection between 10 the second input/output terminal and ROM bluetooth modules 40.
As shown in figure 3, in the present embodiment, switching control module 20 further includes first resistor R1, second resistance R2, third
Resistance R3, the 4th resistance R4 and the 5th resistance R5；First input/output terminal of switch control unit 21 includes the first input and output
Anode and the first input and output negative terminal, the first input and output anode and the first input and output negative terminal connect usb interface module 10
Second input/output terminal；
Second input/output terminal of switch control unit 21 includes switch-over control signal input terminal, the second input and output anode
With the second input and output negative terminal, switch-over control signal input terminal connects ROM bluetooth modules 40 by first resistor R1, and the second input is defeated
Go out anode and ROM bluetooth modules 40 are connect by second resistance R2, the second input and output negative terminal connects ROM bluetooth moulds by 3rd resistor R3
Block 40；
The input terminal of switch control unit 21 includes input positive terminal and input negative terminal, and input positive terminal is connect by the 4th resistance R4
The output end of charging module, input negative terminal connect the output end of charging module 30 by the 5th resistance R5.
Specifically, the first input and output are just terminating the second input and output anode of usb interface module 10；
First input and output negative terminal connects the second input and output negative terminal of usb interface module 10.
Specifically, switch-over control signal input terminal includes the first switch-over control signal input terminal and the second switch-over control signal
Input terminal.
Specifically, switching control module 20 further includes the 23rd pull down resistor R23, the 6th capacitance C6, switching control list
The power supply of member 21 terminates one end of the 23rd pull down resistor R23, the 6th capacitance of another termination of the 23rd pull down resistor R23
One end of C6 and the first power supply, the other end ground connection of the 6th capacitance C6.
Specifically, 20 ground terminal of switching control module is grounded.
In a particular application, switch control unit 21 can be real by the chip or circuit that can arbitrarily realize switching control
It is existing.
In the present embodiment, switch control unit 21 can be specifically a DIO1717 type switch chips.
The first normally open end NO1 (No. 1 pin) of DIO1717 type switch chips, the second normally open end NO2 (No. 2 pins), first
Normal-closed end NC1 (No. 3 pins), the second normal-closed end NC2 (No. 4 pins), the first ends COM COM1 (No. 5 pins),
Two ends COM COM2 (No. 6 pins), first input end IN1 (No. 7 pins), the second input terminal IN2 (No. 8 pins) divide
It Wei not the input negative terminal of switch control unit, input positive terminal, the second input and output negative terminal, the second input and output anode, first defeated
Enter to export negative terminal, the first input and output anode, the first switch-over control signal input terminal, the second switch-over control signal input terminal.
The peripheral circuit of each pin of the DIO1717 types switch chip is as follows：
No. 1 pin (input negative terminal) connects the output end of charging module 30 by the 4th resistance R4；
No. 2 pins (input positive terminal) connect the output end of charging module 30 by the 5th resistance R5；
No. 3 pins (the second input and output negative terminal) connect ROM bluetooth modules 40 by 3rd resistor R3；
No. 4 pins (the second input and output anode) connect ROM bluetooth modules 40 by the 4th resistance R4；
No. 5 pins (the first input and output negative terminal) connect the second input/output terminal of usb interface module 10；
No. 6 pins (the first input and output anode) connect the second input/output terminal of usb interface module 10；
No. 7 pins (the first switch-over control signal input terminal) pass through with No. 8 pins (the second switch-over control signal input terminal)
First resistor R1 connects ROM bluetooth modules 40 altogether；
No. 9 pins (power end VCC) connect one end of the 23rd pull down resistor R23, and the 23rd pull down resistor R23 is another
Terminate one end of the first power supply and the 6th capacitance C6, the 6th capacitance C6 other ends ground connection；
No. 10 pin (ground terminal GND) ground connection.
The present embodiment is connected usb interface module by switching control module and is filled when needing to realize external charge function
Connection between electric module, need realize online upgrading function when, by switching control module connect usb interface module and
Connection between ROM bluetooth modules only can realize online upgrading and externally charging work(simultaneously by a usb interface module
Can, it is simple in structure, it is of low cost.
Example IV
As shown in figure 4, the present embodiment provides the circuit diagrams of the charging module 30.
The charging module that the present embodiment is provided includes charhing unit 31, the output end and input terminal of the charhing unit 31
It is corresponded respectively with the output end of the charging module 30 and input terminal；
The operation principle for the charging module 30 that the utility model embodiment is provided is：
By described between the output end of the charhing unit 31 and the second input/output terminal of the usb interface module 10
When switching control module 20 connects, the charhing unit 31 connects the switching control module 20 by the usb interface module 10
The first input/output terminal be the exterior terminal equipment charge.
Specifically, the output end of charhing unit 31 includes output plus terminal and output negative terminal, the output plus terminal, output negative terminal
Connect the input terminal of the switching control module 20, the inner ground end ground connection of the charhing unit 31.
Specifically, charging module further includes third capacitance C3, the 9th pull down resistor R9, the tenth pull down resistor R10, the 11st
Pull down resistor R11, the 12nd pull down resistor R12, the 13rd pull down resistor R13, the 14th pull down resistor R14, the 15th drop-down
Resistance R15, the 16th pull down resistor R16, the 17th pull down resistor R17, the 18th pull down resistor R18, the 19th pull down resistor
R19, the 20th pull down resistor R20, the 21st pull down resistor R21, the 22nd pull down resistor R22, the 4th capacitance C4 and
Five capacitance C5；
One end of the 9th pull down resistor R9 of logic level selection termination of charhing unit 31, the 9th pull down resistor R9's is another
End and the tenth pull down resistor R10, the 11st pull down resistor R11, the 12nd pull down resistor R12 and the 13rd pull down resistor R13 are simultaneously
Connection is followed by second source, and the logic level selection end of charhing unit 31 also connects the 14th one end pull down resistor R14, the 14th drop-down
The other end of resistance R14 and the 15th pull down resistor R15, the 16th pull down resistor R16, the 17th pull down resistor R17 and the tenth
Eight pull down resistor R18 are connected to ground altogether；
The input port of charhing unit 31 connects the other end of one end and the 9th pull down resistor R9 of third capacitance C3, third electricity
Hold C3 other ends ground connection；
The switch terminals of charhing unit 31 pass through the 15th pull down resistor R15 ground connection；
First logic level input of charhing unit 31 passes through the 16th pull down resistor R16 ground connection；
Second logic level input of charhing unit 31 passes through the 17th pull down resistor R17 ground connection；
The third logic level input of charhing unit 31 passes through the 18th pull down resistor R18 ground connection.
The lower bound stream thresholding end of charhing unit 31 is connect altogether by the 19th pull down resistor R19 and the 20th pull down resistor R20
Yu Di；
The high current limliting thresholding end of charhing unit 31 passes through the 20th pull down resistor R20 ground connection；
The state of charhing unit 31 terminates one end of the 21st pull down resistor R21, and the 21st pull down resistor R21 is another
End and the 22nd one end pull down resistor R22 and the one end for meeting third capacitance C3, third capacitance C3 other ends ground connection；
The failure of charhing unit 31 terminates the 22nd pull down resistor R22 other ends；
The output of charhing unit 31 terminates the 4th one end capacitance C4, the 5th one end capacitance C5 and the first power supply, the 4th capacitance
The C4 other ends and the 5th capacitance C5 other ends are connected to ground altogether.
In a particular application, charhing unit 31 can be real by any chip that can carry out external charge function or circuit
It is existing.
In the present embodiment, charhing unit 31 can be specifically the vehicle-mounted USB charging management chips of a TPS2546 type.
The voltage input end IN (No. 1 pin) of the TPS2546 cake cores, (No. 10 are drawn the second input and output anode DP_IN
Foot), the second input and output negative terminal DM_IN (No. 11 pins) be respectively the input terminal of charhing unit, output plus terminal, output negative terminal.
The peripheral circuit of each pin of the TPS2546 cake cores is as follows：
No. 1 pin (input terminal) connects one end and the second source of third capacitance C3, third capacitance C3 other ends ground connection；
No. 2 pins (the first input and output negative terminal DM_OUT), No. 3 pins (the second input and output negative terminal DP_OUT) empty.
No. 4 pins (logic level selects end ILIM_SEL) meet one end of the 9th pull down resistor R9, the 9th pull down resistor R9
The other end and the tenth pull down resistor R10, the 11st pull down resistor R11, the 12nd pull down resistor R12 and the 13rd pull down resistor
R13 parallel connections are followed by second source, and No. 4 pins also connect the 14th one end pull down resistor R14, and the 14th pull down resistor R14's is another
End and the 15th pull down resistor R15, the 16th pull down resistor R16, the 17th pull down resistor R17 and the 18th pull down resistor R18
It is connected to ground altogether；
No. 5 pins (switch terminals EN) pass through the 15th pull down resistor R15 ground connection；
No. 6 pins (the first logic level input CTL1) pass through the 16th pull down resistor R16 ground connection；
No. 7 pins (the second logic level input CTL2) pass through the 17th pull down resistor R17 ground connection；
No. 8 pins (third logic level input CTL3) pass through the 18th pull down resistor R18 ground connection.
No. 9 pins (state end) connect one end of the 21st pull down resistor R21, the another one end R21 of the 21st pull down resistor
With the 22nd one end pull down resistor R22 and connect one end of third capacitance C3, third capacitance C3 other ends ground connection；
No. 10 pins (output plus terminal) connect the input terminal of switching control module 20；
No. 11 pins (output negative terminal) connect the input terminal of switching control module 20；
No. 12 pins (output end OUT) connect the 4th one end capacitance C4, the 5th one end capacitance C5 and the first power supply, the 4th capacitance
The C4 other ends and the 5th capacitance C5 other ends are connected to ground altogether
No. 13 pins (failure end) connect the 22nd pull down resistor R22 other ends；
No. 14 pin (ground terminal GND) ground connection
No. 15 pins (lower bound stream thresholding end ILIM_LO) pass through the 19th pull down resistor R19 and the 20th pull down resistor R20
It is connected to ground altogether；
No. 16 pins (high current limliting thresholding end ILIM_HI) pass through the 20th pull down resistor R20 ground connection；
PAD inner grounds end is grounded；
Specifically, this circuit CTL1/CTL2/CTL3/ILIM_SEL is set as 0111, is accurate charging load Auto-Sensing
Pattern, charging current are Ich=50250/R98=50250/49.9K=1007mA ≈ 1A.
The present embodiment realizes the function of externally charging under charge mode by charging module.
The utility model embodiment also provides a kind of terminal device, including above-mentioned switching circuit.
The identical terminals of label homogeneously connect in all embodiments of the utility model.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (10)
1. a kind of switching circuit, which is characterized in that including usb interface module, switching control module and charging module；
First input and output of the usb interface module terminate exterior terminal equipment, and the second input of the usb interface module is defeated
Go out the first input/output terminal for terminating the switching control module, the second input and output of the switching control module terminate ROM
The input of bluetooth module, the charging module terminates the ROM bluetooth modules, and the output of the charging module terminates the switching
The input terminal of control module；
The switching control module connects the USB interface according to the first switch-over control signal that the ROM bluetooth modules export
Connection between the second input/output terminal and the output end of the charging module of module passes through the of the usb interface module
One input/output terminal is the exterior terminal equipment charge；
The switching control module connects the USB interface according to the second switch-over control signal that the ROM bluetooth modules export
Connection between second input/output terminal of module and the ROM bluetooth modules passes through the first input of the usb interface module
Output end input upgrading data upgrade the ROM bluetooth modules.
2. switching circuit as described in claim 1, which is characterized in that the switching control module includes switch control unit,
The first input/output terminal, the second input/output terminal and the input terminal of the switch control unit respectively with the switching control module
The first input/output terminal, the second input/output terminal and input terminal correspond；
The switch control unit connects the USB interface according to the first switch-over control signal that the ROM bluetooth modules export
Connection between the second input/output terminal and the output end of the charging module of module；
The switch control unit connects the USB interface according to the second switch-over control signal that the ROM bluetooth modules export
Connection between second input/output terminal of module and the ROM bluetooth modules.
3. switching circuit as claimed in claim 2, which is characterized in that the switching control module further includes first resistor,
Two resistance, 3rd resistor, the 4th resistance and the 5th resistance；
First input/output terminal of the switch control unit includes the first input and output anode and the first input and output negative terminal, institute
It states the first input and output anode and the first input and output negative terminal connects the second input/output terminal of the usb interface module；
Second input/output terminal of the switch control unit include switch-over control signal input terminal, the second input and output anode and
Second input and output negative terminal, the switch-over control signal input terminal connects the ROM bluetooth modules by the first resistor, described
Second input and output anode connects the ROM bluetooth modules by the second resistance, and the second input and output negative terminal passes through institute
It states 3rd resistor and connects the ROM bluetooth modules；
The input terminal of the switch control unit includes input positive terminal and input negative terminal, and the input positive terminal passes through the 4th electricity
Resistance connects the output end of the charging module, and the input negative terminal connects the output end of the charging module by the 5th resistance.
4. switching circuit as described in claim 1, which is characterized in that the usb interface module includes usb interface unit, institute
The first input/output terminal and the second input/output terminal for stating usb interface unit are inputted with the first of the usb interface module respectively
Output end and the second input/output terminal correspond；
Pass through the switching control module between the second input/output terminal and the output end of charging module of the usb interface unit
When connection, the first input/output terminal by the usb interface module is the exterior terminal equipment charge.
5. switching circuit as claimed in claim 4, which is characterized in that the usb interface module further includes the 6th resistance and
Seven resistance；
First input/output terminal of the usb interface unit includes the first input and output anode and the first input and output negative terminal, institute
It states the first input and output anode and the first input and output negative terminal connects the exterior terminal equipment；
Second input/output terminal of the usb interface unit includes the second input and output anode and the second input and output negative terminal, institute
State one end that the second input and output are just terminating the 6th resistance, another termination switching control module of the 6th resistance
The first input/output terminal, the second input and output negative terminal connects one end of the 7th resistance, the 7th resistance it is another
Terminate the first input/output terminal of the switching control module.
6. switching circuit as claimed in claim 4, which is characterized in that the usb interface module further include the first varistor,
Second varistor, third varistor, the first capacitance, the second capacitance, the 8th pull down resistor and the first magnetic bead；
Second input and output are just terminating one end of the 6th resistance, and the other end and the switching of the 6th resistance are controlled
First input/output terminal of molding block, first varistor termination first capacitance one end, first pressure
The other end of quick resistance and the other end of first capacitance are connected to ground altogether；
The second input and output negative terminal connects one end of the 7th resistance, another termination switching control of the 7th resistance
One end of one end and second capacitance of the first input/output terminal of molding block, second varistor, second pressure
The other end of quick resistance and the other end of second capacitance are connected to ground altogether；
The ground terminal of the usb interface unit is grounded by the 8th pull down resistor；
The power supply of the usb interface unit terminates one end of first magnetic bead, the first electricity of another termination of first magnetic bead
The one end in source and the third varistor, the other end ground connection of the third varistor.
7. switching circuit as described in claim 1, which is characterized in that the charging module includes charhing unit, the charging
The output end and input terminal of unit are corresponded with the output end of the charging module and input terminal respectively；
Pass through the switching control between the output end of the charhing unit and the second input/output terminal of the usb interface module
When module connects, the charhing unit connects first input/output terminal of the switching control module by the usb interface module
For the exterior terminal equipment charge.
8. switching circuit as claimed in claim 7, which is characterized in that the output end of the charhing unit include output plus terminal and
Negative terminal is exported, the output plus terminal, output negative terminal connect the input terminal of the switching control module, the inside of the charhing unit
Ground terminal is grounded.
9. switching circuit as claimed in claim 7, which is characterized in that the charging module further includes under third capacitance, the 9th
Pull-up resistor, the tenth pull down resistor, the 11st pull down resistor, the 12nd pull down resistor, the 13rd pull down resistor, the 14th drop-down electricity
Resistance, the 15th pull down resistor, the 16th pull down resistor, the 17th pull down resistor, the 18th pull down resistor, the 19th drop-down electricity
Resistance, the 20th pull down resistor, the 21st pull down resistor, the 22nd pull down resistor, the 4th capacitance and the 5th capacitance；
The logic level selection of the charhing unit terminates one end of the 9th pull down resistor, the 9th pull down resistor it is another
One end and the tenth pull down resistor, the 11st pull down resistor, the 12nd pull down resistor and the 13rd drop-down
Resistor coupled in parallel is followed by second source, and the logic level selection end of the charhing unit also connects described 14th pull down resistor one end,
The other end of 14th pull down resistor and the 15th pull down resistor, the 16th pull down resistor, the described 17th
Pull down resistor and the 18th pull down resistor are connected to ground altogether；
The input port of the charhing unit connects the other end of one end and the 9th pull down resistor of the third capacitance, described
The third capacitance other end is grounded, the other end and the tenth pull down resistor, the 11st drop-down of the 9th pull down resistor
Resistance, the 12nd pull down resistor and the 13rd pull down resistor parallel connection are followed by the second source；
The switch terminals of the charhing unit are grounded by the 15th pull down resistor；
First logic level input of the charhing unit is grounded by the 16th pull down resistor；
Second logic level input of the charhing unit is grounded by the 17th pull down resistor；
The third logic level input of the charhing unit is grounded by the 18th pull down resistor；
The lower bound stream thresholding end of the charhing unit is connect by the 19th pull down resistor with the 20th pull down resistor altogether
Yu Di；
The high current limliting thresholding end of the charhing unit is grounded by the 20th pull down resistor；
The state of the charhing unit terminates one end of the 21st pull down resistor, and the 21st pull down resistor is another
End and described 22nd pull down resistor one end and the one end for connecing the third capacitance, the third capacitance other end ground connection；
The failure of the charhing unit terminates the 22nd pull down resistor other end；
The output of the charhing unit terminates described 4th capacitance one end, described 5th capacitance one end and first power supply, institute
It states the 4th capacitance other end and is connected to ground altogether with the 5th capacitance other end.
10. a kind of terminal device, which is characterized in that including such as claim 1-9 any one of them switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721687148.2U CN207704429U (en) | 2017-12-06 | 2017-12-06 | A kind of switching circuit and terminal device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721687148.2U CN207704429U (en) | 2017-12-06 | 2017-12-06 | A kind of switching circuit and terminal device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207704429U true CN207704429U (en) | 2018-08-07 |
Family
ID=63025105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721687148.2U Withdrawn - After Issue CN207704429U (en) | 2017-12-06 | 2017-12-06 | A kind of switching circuit and terminal device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207704429U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109885517A (en) * | 2017-12-06 | 2019-06-14 | 深圳市冠旭电子股份有限公司 | A kind of switching circuit and terminal device |
| TWI763968B (en) * | 2019-01-17 | 2022-05-11 | 鴻海精密工業股份有限公司 | Protection circuit and usb tranmission device using the same |
-
2017
- 2017-12-06 CN CN201721687148.2U patent/CN207704429U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109885517A (en) * | 2017-12-06 | 2019-06-14 | 深圳市冠旭电子股份有限公司 | A kind of switching circuit and terminal device |
| CN109885517B (en) * | 2017-12-06 | 2024-01-12 | 深圳市冠旭电子股份有限公司 | Switching circuit and terminal equipment |
| TWI763968B (en) * | 2019-01-17 | 2022-05-11 | 鴻海精密工業股份有限公司 | Protection circuit and usb tranmission device using the same |
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