CN209231922U - USB OTG interface isolation circuit - Google Patents
USB OTG interface isolation circuit Download PDFInfo
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- CN209231922U CN209231922U CN201822122073.4U CN201822122073U CN209231922U CN 209231922 U CN209231922 U CN 209231922U CN 201822122073 U CN201822122073 U CN 201822122073U CN 209231922 U CN209231922 U CN 209231922U
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Abstract
A kind of USB OTG interface isolation circuit, applied to USB OTG equipment, the interface isolation circuit one end USB OTG is electrically connected with internal USB interface, the USB OTG interface isolation circuit other end is electrically connected with external USB interface, to realize the electrical isolation of the USB OTG interface of USB OTG equipment, USB OTG interface isolation circuit includes at least the first USB isolation module, 2nd USB isolation module, generic logic isolation module and USB switching switch, USB switching switch is electrically connected with the first USB isolation module, USB switching switch is electrically connected with generic logic isolation module, USB switching switch is electrically connected with the 2nd USB isolation module.First USB isolation module can choose using USB OTG interface isolation circuit external USB interface to be determined as from equipment when realizing the access of OTG cable, internal USB interface is determined as main equipment, under the premise of the first USB isolation module realizes electrical isolation, the access of OTG cable is supported to realize the OTG function of USB OTG interface, solves the technical issues of electrical isolation that cannot achieve USB OTG interface.
Description
Technical field
The utility model relates to electronic circuit technology field more particularly to a kind of universal serial bus (Universal
Serial Bus, USB) OTG interface isolation circuit.
Background technique
USB interface is a kind of general-purpose interface of data exchange, be widely used in various communication products (such as computer,
Embedded device etc.) in, when a host accesses multiple USB devices by USB interface, if sealed in these USB devices
High voltage interference has been sealed in connecting cable between high voltage interference or host and USB device, then may have been occurred because of height
Voltage disturbance is so that situations such as USB interface of host is burnt out, CPU is burnt out.In this regard, for USB interface can be set electrically every
From USB interface external disturbance being isolated using USB isolating chip, the mode of this set electrical isolation becomes guarantee host
The indispensable safety measure of safe operation.
With the enhancing of the computing capability of mobile device and the demand of practical application, USB realizes NAB National Association 0f Broadcasters
(Universal Serial Bus Implementers Forums, USBIF) develops the rule of USB OTG (On-The-Go)
The equipment for supporting USB OTG specification is usually referred to as USB OTG equipment by model, and can be by USB using USB OTG technology
OTG equipment is switched to main equipment, directly to carry out USB OTG equipment and between equipment (such as USB flash disk, keyboard, mouse)
Data exchange.In practice, it has been found that existing USB isolating chip do not support the USB OTG Interface Electrical of USB OTG equipment every
From so as to cause there are security risks.
As it can be seen that how to realize that the electrical isolation of USB OTG interface becomes a urgent problem needed to be solved.
Utility model content
The utility model embodiment discloses a kind of USB OTG interface isolation circuit, can be realized the electrical of USB OTG interface
Isolation.
The utility model embodiment discloses a kind of USB OTG interface isolation circuit, and the USB OTG interface isolation circuit is answered
For USB OTG equipment, described interface isolation circuit one end USB OTG is electrically connected with internal USB interface, and the USB OTG connects
The mouth isolation circuit other end is electrically connected with external USB interface, the electricity of the USB OTG interface to realize the USB OTG equipment
Air bound includes at least the first USB isolation module from, the USB OTG interface isolation circuit, the 2nd USB isolation module, general patrols
Isolation module and USB switching switch are collected, the USB switching switch is electrically connected with the first USB isolation module, and the USB is cut
It changes switch to be electrically connected with the generic logic isolation module, the USB switching switch is electrically connected with the 2nd USB isolation module
It connects, in which:
The generic logic isolation module, for determining described general when the external USB interface accesses OTG cable
First pin of logic isolation module receives the low level signal of external USB interface input, and by the generic logic
The low level signal and first pipe that second pin of isolation module is generated according to the low level signal of first pin
The low level signal of foot inputs the USB switching switch；
The USB switching switch, for responding the low level signal of first pin Yu second pin, Xiang Suoshu
First USB isolation module inputs the first isolation signals, and first isolation signals are used to indicate selection the first USB isolation mode
Block realizes the electrical isolation of the USB OTG interface；
The first USB isolation module, for responding first isolation signals, by the first USB isolation module
Upstream port is determined as main equipment by the internal USB interface that the USB switches switch connection, and by described first
The downstream port of USB isolation module is determined as using from equipment by the external USB interface that the USB switches switch connection
To realize the electrical isolation of the USB OTG interface；
The generic logic isolation module is also used to determine institute when the external USB interface accesses generic USB cable
First pin for stating generic logic isolation module receives the high level signal of external USB interface input, and by institute
State the high level signal that second pin of generic logic isolation module is generated according to the high level signal of first pin
And the high level signal of first pin inputs the USB switching switch；
The USB switching switch, is also used to respond the high level signal of first pin Yu second pin, to institute
It states the 2nd USB isolation module and inputs the second isolation signals, second isolation signals are used to indicate selection the 2nd USB isolation
The electrical isolation of module realization generic USB interface；
The 2nd USB isolation module, for responding second isolation signals, by the 2nd USB isolation module
Upstream port is determined as main equipment by the external USB interface that the USB switches switch connection, and by described second
The downstream port of USB isolation module is determined as using from equipment by the internal USB interface that the USB switches switch connection
To realize the electrical isolation of the generic USB interface.
As an alternative embodiment, the USB OTG interface isolation circuit is also in the utility model embodiment
Including power switching module, the power switching module is electrically connected with the external USB interface, in which:
The generic logic isolation module is also used to the first USB isolation module in the first USB isolation module
Upstream port main equipment is determined as by the internal USB interface that the USB switches switch connection, and by described first
The downstream port of USB isolation module by the USB switch switch connection the external USB interface be determined as from equipment it
Afterwards, determine that the third pin of the generic logic isolation module and the 4th pin receive high level signal, and according to described
The high level signal of the high level signal of three-prong and the 4th pin exports connection signal to the power switching module；
The power switching module, for connected according to the connection signal power switching module the 5th pin and
6th pin, so that the internal USB interface is powered to the 6th pin.
As an alternative embodiment, in the utility model embodiment,
The generic logic isolation module is also used to the 2nd USB isolation module in the 2nd USB isolation module
Upstream port main equipment is determined as by the external USB interface that the USB switches switch connection, and by described second
The downstream port of USB isolation module by the internal USB interface that the USB switches switch connection be determined as from equipment it
Afterwards, determine that the third pin and the 4th pin receive low level signal, and according to the low level of the third pin
The low level signal of signal and the 4th pin exports cut-off signal to the power switching module；
The power switching module is also used to disconnect the 5th pin and the 6th pin according to the cut-off signal
Between connection so that the external USB interface is powered to the 6th pin.
As an alternative embodiment, the power switching module is for switching in the utility model embodiment
Power supply on OTG line.
As an alternative embodiment, the USB switching switch includes front end in the utility model embodiment
USB switching switch and rear end USB switching switch, the downstream of front end USB the switching switch and the first USB isolation module
Mouth electrical connection, the front end USB switching switch are electrically connected with the upstream port of the 2nd USB isolation module, the rear end USB
Switching switch is electrically connected with the upstream port of the first USB isolation module, the rear end USB switching switch and described second
The downstream port of USB isolation module is electrically connected.
As an alternative embodiment, in the utility model embodiment, the front end USB switching switch with it is described
External USB interface electrical connection, the rear end USB switching switch are electrically connected with the internal USB interface.
As an alternative embodiment, the external USB interface is equipped with electrostatic impedor and EMI FILTER.
Compared with prior art, the utility model embodiment has the advantages that
In the utility model embodiment, the utility model selects the side of USB isolation module using USB switching switch control
Formula can select the first USB isolation module using USB switching switch control when OTG cable is accessed, and external USB interface is true
It is set to from equipment and internal USB interface is determined as main equipment, realizes the electrical isolation of USB OTG interface.Implement this
Utility model, USB OTG interface isolation circuit can choose the first USB isolation module to realize the principal and subordinate when access of OTG cable
Equipment determines, under the premise of the first USB isolation module realizes electrical isolation, supports the access of OTG cable to realize that USB OTG connects
The OTG function of mouth, solves the technical issues of electrical isolation that cannot achieve USB OTG interface.
Detailed description of the invention
In order to illustrate more clearly of the technical scheme in the embodiment of the utility model, will make below to required in embodiment
Attached drawing is briefly described, it should be apparent that, the drawings in the following description are merely some embodiments of the present invention,
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings
Other attached drawings.
Fig. 1 is a kind of structural schematic diagram of USB OTG interface isolation circuit disclosed in the utility model embodiment；
Fig. 2 is the structural schematic diagram of another kind USB OTG interface isolation circuit disclosed in the utility model embodiment；
Fig. 3 is the structural schematic diagram of another kind USB OTG interface isolation circuit disclosed in the utility model embodiment.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
It clearly and completely describes, it is clear that described embodiment is only the utility model a part of the embodiment, rather than whole realities
Apply example.Based on the embodiments of the present invention, those of ordinary skill in the art institute without making creative work
The every other embodiment obtained, fall within the protection scope of the utility model.
It should be noted that term " includes " in the utility model embodiment and attached drawing and " having " and they are any
Deformation, it is intended that cover and non-exclusive include.Such as contain the process, method, system, product of a series of steps or units
Or equipment is not limited to listed step or unit, but optionally further comprising the step of not listing or unit, or can
Selection of land further includes the other step or units intrinsic for these process, methods, product or equipment.
The utility model embodiment discloses a kind of USB OTG interface isolation circuit, and being able to solve cannot achieve USB OTG and connect
The technical issues of electrical isolation of mouth.It is described in detail below with reference to attached drawing.
Referring to Fig. 1, Fig. 1 is that a kind of structure of USB OTG interface isolation circuit disclosed in the utility model embodiment is shown
It is intended to, USB OTG interface isolation circuit is applied to USB OTG equipment, and the interface isolation circuit one end USB OTG connects with inside USB
Mouth electrical connection, the USB OTG interface isolation circuit other end is electrically connected with external USB interface, to realize USB OTG equipment
The electrical isolation of USB OTG interface, the USB OTG interface isolation circuit may include: that generic logic isolation module 100, USB are cut
Switch 200, the first USB isolation module 300 and the 2nd USB isolation module 400 are changed, USB switching switch 200 is isolated with the first USB
Module 300 is electrically connected, and USB switching switch 200 is electrically connected with generic logic isolation module 100, and USB switches switch 200 and second
USB isolation module 400 is electrically connected, in which:
Generic logic isolation module 100, for determining generic logic isolation mode when external USB interface accesses OTG cable
First pin of block 100 receives the low level signal of external USB interface input, and by the of generic logic isolation module 100
The low level signal for the low level signal and the first pin that two pins are generated according to the low level signal of the first pin inputs USB
Switching switch.
It, can be by generic logic isolation module 100 when external USB interface accesses OTG cable in the utility model embodiment
Corresponding first pin of USB_ID_O signal drag down, at this point, it is outer to determine that corresponding first pin of USB_ID_O signal receives
The low level signal of portion's USB interface input, corresponding second pin of the USB_ID signal of generic logic isolation module 100 is according to the
The low level signal of one pin can generate corresponding low level signal, and low level signal input USB is switched switch 200.
USB switches switch 200, for responding the low level signal of the first pin and the second pin, to the first USB isolation mode
Block 300 inputs the first isolation signals, and the first isolation signals are used to indicate the first USB isolation module 300 of selection and realize that USB OTG connects
The electrical isolation of mouth.
In the utility model embodiment, USB switches switch 200 can be defeated according to corresponding first pin of USB_ID_O signal
The low level signal of the corresponding second pin input of the low level signal and USB_ID signal entered determines selection the first USB isolation
The electrical isolation of the realization USB OTG interface of module 300.
First USB isolation module 300, for responding the first isolation signals, by the upstream end of the first USB isolation module 300
Mouthful main equipment is determined as by the inside USB interface that USB switches the connection of switch 200, and by the first USB isolation module 300
Downstream port switches the external USB interface that switch 200 connects by USB and is determined as from equipment, to realize USB OTG interface
Electrical isolation.
In the utility model embodiment, when carrying out electrical isolation using the first USB isolation module 300, USB can be switched
The inside USB interface that switch 200 connects is determined as main equipment, and the external USB interface of the USB switching connection of switch 200 is true
It is set to from equipment, realizes that the USB interface under OTG mode is isolated with this.
Generic logic isolation module 100 is also used to determine generic logic when external USB interface accesses generic USB cable
First pin of isolation module 100 receives the high level signal of external USB interface input, and by generic logic isolation module
The high level signal of high level signal and the first pin that 100 the second pin is generated according to the high level signal of the first pin
It inputs USB and switches switch 200.
It, can be by generic logic isolation mode when external USB interface accesses generic USB cable in the utility model embodiment
Corresponding first pin of the USB_ID_O signal of block 100 is drawn high, at this point, determining that corresponding first pin of USB_ID_O signal receives
The high level signal inputted to external USB interface, the corresponding second pin root of the USB_ID signal of generic logic isolation module 100
Corresponding high level signal can be generated according to the high level signal of the first pin, and high level signal input USB switching is switched
200。
USB switches switch 200, is also used to respond the high level signal of the first pin and the second pin, is isolated to the 2nd USB
Module 400 inputs the second isolation signals, and the second isolation signals are used to indicate the 2nd USB isolation module 400 of selection and realize generic USB
The electrical isolation of interface.
In the utility model embodiment, USB switches switch 200 can be defeated according to corresponding first pin of USB_ID_O signal
The high level signal of the corresponding second pin input of the high level signal and USB_ID signal entered determines selection the 2nd USB isolation
The electrical isolation of module realization USB OTG interface.And the upstream port and the 2nd USB isolation mode of the first USB isolation module 300
The downstream port of block 400 is in the same direction, the downstream port of the first USB isolation module 300 and the upstream end of the 2nd USB isolation module 400
Mouth is in the same direction, to realize different master-slave equipment role switchings.
2nd USB isolation module 400, for responding the second isolation signals, by the upstream end of the 2nd USB isolation module 400
Mouthful main equipment is determined as by the external USB interface that USB switches the connection of switch 200, and by the 2nd USB isolation module 400
Downstream port switches the inside USB interface that switch 200 connects by USB and is determined as from equipment, to realize generic USB interface
Electrical isolation.
In USB OTG interface isolation circuit shown in Fig. 1, USB OTG interface isolation circuit further includes power switch mould
Block 500, power switching module 500 are electrically connected with external USB interface, in which:
Generic logic isolation module 100 is also used to the first USB isolation module 300 in the first USB isolation module 300
Upstream port is determined as main equipment by the inside USB interface that USB switches the connection of switch 200, and by the first USB isolation module
300 downstream port switches the external USB interface that switch 200 connects by USB and is determined as after equipment, determines generic logic
The third pin and the 4th pin of isolation module 100 receive high level signal, and according to the high level signal of third pin with
And the 4th pin high level signal to power switching module export connection signal.
In the utility model embodiment, in the first USB isolation module 300 by the upstream port of the first USB isolation module 300
Switch the inside USB interface that switch 200 connects by USB and be determined as main equipment, and will be under the first USB isolation module 300
Trip port switches the external USB interface that switch 200 connects by USB and is determined as after equipment, determines generic logic isolation mode
The corresponding third pin of the USB_OTG_DRVVBUS signal of block 100 receives high level signal, and determines generic logic isolation
Corresponding 4th pin of the USB_OTG_DRVVBUS_O signal of module 100 receives high level signal.
Power switching module 500, for connecting the 5th pin and the 6th pin of power switching module according to connection signal,
So that internal USB interface is powered to the 6th pin.
In the utility model embodiment, power switching module 500 can be according to connection signal by the 5V_ of power switching module
Corresponding 5th pin of PWR signal corresponding with VBUS_O the 6th pin connection, so that main equipment (internal USB interface) is to the 6th
Pin power supply.
Generic logic isolation module 100 is also used to the 2nd USB isolation module 400 in the 2nd USB isolation module 400
Upstream port is determined as main equipment by the external USB interface that USB switches the connection of switch 200, and by the 2nd USB isolation module
400 downstream port switches the inside USB interface that switch 200 connects by USB and is determined as after equipment, determines third pin
Low level signal is received with the 4th pin, and according to the low level signal of third pin and the low level signal of the 4th pin
Cut-off signal is exported to power switching module 500.
In the utility model embodiment, in the 2nd USB isolation module 400 by the upstream port of the 2nd USB isolation module 400
Switch the external USB interface that switch 200 connects by USB and be determined as main equipment, and will be under the 2nd USB isolation module 400
Trip port switches the inside USB interface that switch 200 connects by USB and is determined as after equipment, determines generic logic isolation mode
The corresponding third pin of the USB_OTG_DRVVBUS signal of block 100 receives low level signal, and determines generic logic isolation
Corresponding 4th pin of the USB_OTG_DRVVBUS_O signal of module 100 receives low level signal.
Power switching module 500 is also used to disconnect the connection between the 5th pin and the 6th pin according to cut-off signal, with
External USB interface is set to power to the 6th pin.
In the utility model embodiment, power switching module is for the power supply on switch OTG line.
In the utility model embodiment, power switching module 500 can be according to cut-off signal by power switching module 500
Corresponding 5th pin of 5V_PWR signal the 6th pin corresponding with VBUS_O disconnects, so that (external USB connects main equipment
Mouthful) power to the 6th pin.
In USB OTG interface isolation circuit shown in Fig. 1, it includes that front end USB switches switch 201 that USB, which switches switch 200,
Switching switch 202 with rear end USB, USB switching switch 201 in front end is electrically connected with the downstream port of the first USB isolation module 300,
USB switching switch 201 in front end is electrically connected with the upstream port of the 2nd USB isolation module 400, rear end USB switching switch 202 and the
The upstream port of one USB isolation module 300 is electrically connected, and rear end USB switches the downstream of switch 202 and the 2nd USB isolation module 400
Port electrical connection.
In the utility model embodiment, USB switching switch 201 in front end is electrically connected with external USB interface, rear end USB switching
Switch 202 is electrically connected with internal USB interface.
In the utility model embodiment, external USB interface is equipped with electrostatic impedor and EMI FILTER.
Referring to Fig. 2, Fig. 2 is the structure of another kind USB OTG interface isolation circuit disclosed in the utility model embodiment
Schematic diagram, Fig. 2 are the particular circuit configurations figures of the USB OTG interface isolation circuit based on Fig. 1, wherein generic logic isolation mode
Block 100 uses chip ADuM142E1BRWZ, front end USB to switch switch 201 and uses chip TS3USB221E, and USB switching in rear end is opened
It closes 202 and uses chip TS3USB221E, the first USB isolation module 300 uses chip ADUM3160BRWZ, the 2nd USB isolation mode
Block 400 uses chip ADUM3160BRWZ, and power switching module 500 is opened using the USB_VBUS power supply that NMOS and PMOS is formed
It closes, wherein
Generic logic isolation module 100 can also include capacitor C11 and capacitor C12, and capacitor C11 and capacitor C12 are equal
For 1 μ F/16V and resistance R8, resistance R10 and R11, and resistance R8, resistance R10 and resistance R11 are 10k/5%, and
And capacitor C11, capacitor C12, resistance R8, resistance R10 and resistance R11 are electrically connected with chip ADuM142E1BRWZ, chip
ADuM142E1BRWZ include VDD1 pin, GND pin, VIA pin, VIB pin, VOC pin, VOD pin, VE1 pin,
GND1 pin, VDD2 pin, GND2 pin, VOA pin, VOB pin, VIC pin, VID pin, VE2 pin and GND2 pipe
Foot.Wherein, generic logic isolation module 100 is electrically connected by the VID pin in Fig. 2 marked as 11 with external USB interface, general
Logic isolation module 100 is electrically connected by the VOD pin in Fig. 2 marked as 6 with internal USB interface, when external USB interface accesses
When OTG cable, determine that the first pin (VID pin) receives low level signal, and the second pin (VOD pin) is according to first
The low level signal of pin can also generate low level signal, cut at this point, the low level signal of the second pin can input rear end USB
Change switch 202, the low level signal of the first pin can switch switch 201 with input front end USB, to control to the first USB every
The first isolation signals are inputted from module 300, the first USB isolation module 300 is selected to realize the electrical isolation of USB OTG interface.And
And second the low level signal of pin can input internal USB switching switch 200.In addition, VIB pin connects under OTG mode
The USB_OTG_DRVVBUS signal received is high level, and the corresponding USB_OTG_DRVVBUS_O signal of VOB pin is also high electricity
It is flat so that the connection of power switching module closure 5V_PWR and VBUS_O so that as main equipment inside USB interface to
VBUS_O power supply.When external USB interface accesses generic USB cable (non-OTG line), determine that the first pin (VID pin) receives
To high level signal, and the second pin (VOD pin) can also generate high level signal according to the high level signal of the first pin,
At this point, the high level signal of the second pin can input rear end USB switching switch 202, the high level signal of the first pin can be with
Input front end USB switches switch 201, inputs the second isolation signals, selection to the 2nd USB isolation module 400 to control input
The electrical isolation of 2nd USB isolation module 400 realization USB OTG interface.Also, the high level signal of the second pin can input
USB switches switch 200.In addition, in the normal mode, the USB_OTG_DRVVBUS signal that VIB pin receives is low level,
The corresponding USB_OTG_DRVVBUS_O signal of VOB pin is also low level, so that power switching module 500 disconnects 5V_
The connection of PWR and VBUS_O, so that the external USB interface 900 as main equipment is powered to VBUS_O.
It can also include capacitor C5 that front end USB, which switches switch 201, and capacitor C5 is electrically connected with chip TS3USB221E, chip
TS3USB221E includes at least D+ pin, D- pin, 1D+ pin, 1D- pin, 2D+ pin and 2D- pin, 1D+ pin, 1D-
Pin is electrically connected with the first USB isolation module 300, and 2D+ pin, 2D- pin are electrically connected with the 2nd USB isolation module 400, D+ pipe
Foot, D- pin are electrically connected with external USB interface 900.
It can also include capacitor C4 that rear end USB, which switches switch 202, and capacitor C4 is electrically connected with chip TS3USB221E, chip
TS3USB221E includes at least D+ pin, D- pin, 1D+ pin, 1D- pin, 2D+ pin and 2D- pin, wherein D+ pin,
D- pin is electrically connected with internal USB interface 800, and 1D+ pin, 1D- pin are electrically connected with the first USB isolation module 300,2D+ pipe
Foot, 2D- pin are electrically connected with the 2nd USB isolation module 400.
First USB isolation module 300 can also include capacitor C2, capacitor C3 and capacitor C8, capacitor C2, capacitor C3, capacitor
C8 is electrically connected with chip ADUM3160BRWZ, and chip ADUM3160BRWZ includes at least VBUS1 pin, GND1 pin, VDD1 pipe
Foot, PDEN pin, SPU pin, UD- pin, UD+ pin, GND1 pin, VBUS2 pin, GND2 pin, VDD2 pin, SPD
Pin, PIN pin, DD- pin, DD+ pin and GND2 pin.Wherein, UD- pin, UD+ pin and rear end USB power source switch
202 electrical connections, DD- pin, DD+ pin are electrically connected with front end USB power source switch 201.
2nd USB isolation module 400 can also include capacitor C8, capacitor C9 and capacitor C10, capacitor C8, capacitor C9 and electricity
Hold C10 to be electrically connected with chip ADUM3160BRWZ, chip ADUM3160BRWZ includes at least VBUS1 pin, GND1 pin, VDD1
Pin, PDEN pin, SPU pin, UD- pin, UD+ pin, GND1 pin, VBUS2 pin, GND2 pin, VDD2 pin,
SPD pin, PIN pin, DD- pin, DD+ pin and GND2 pin.Wherein, UD- pin, UD+ pin and front end USB power source are opened
201 electrical connections are closed, DD- pin, DD+ pin are electrically connected with rear end USB power source switch 202.
In the utility model embodiment, accessory power supply 700 includes that the accessory power supply of a 3V power supply and a 5V power
Accessory power supply.
Referring to Fig. 3, Fig. 3 is the structure of another kind USB OTG interface isolation circuit disclosed in the utility model embodiment
Schematic diagram, wherein Fig. 3 be shown in USB OTG interface isolation circuit and USB OTG interface isolation circuit shown in Fig. 2 area
It is not only that:
First USB isolation module 300 and the 2nd USB isolation module 400 are all made of LTM2884CY chip；Accessory power supply 700
5V power supply is increased, front end USB switches switch 201 and powered by the VLO2 pin of LTM2884CY chip.
A kind of USB OTG interface isolation circuit disclosed in the utility model embodiment is described in detail above, this
It applies specific case in text to be expounded the principles of the present invention and embodiment, the explanation of above embodiments is
It is used to help understand the method and its core concept of the utility model；At the same time, for those skilled in the art, according to this
The thought of utility model, there will be changes in the specific implementation manner and application range, in conclusion the content of the present specification
It should not be construed as a limitation of the present invention.
Claims (7)
1. a kind of USB OTG interface isolation circuit, which is characterized in that the USB OTG interface isolation circuit is applied to USB OTG
Equipment, described interface isolation circuit one end USB OTG are electrically connected with internal USB interface, and the USB OTG interface isolation circuit is another
One end is electrically connected with external USB interface, the electrical isolation of the USB OTG interface to realize the USB OTG equipment, described
USB OTG interface isolation circuit include at least the first USB isolation module, the 2nd USB isolation module, generic logic isolation module and
USB switching switch, the USB switching switch be electrically connecteds with the first USB isolation module, the USB switch switch with it is described
The electrical connection of generic logic isolation module, the USB switching switch are electrically connected with the 2nd USB isolation module, in which:
The generic logic isolation module, for determining the generic logic when the external USB interface accesses OTG cable
First pin of isolation module receives the low level signal of the external USB interface input, and the generic logic is isolated
Low level signal that second pin of module is generated according to the low level signal of first pin and first pin
Low level signal inputs the USB switching switch；
The USB switching switch, for responding the low level signal of first pin Yu second pin, Xiang Suoshu first
USB isolation module inputs the first isolation signals, and it is real that first isolation signals are used to indicate selection the first USB isolation module
The electrical isolation of the existing USB OTG interface；
The first USB isolation module, for responding first isolation signals, by the upstream of the first USB isolation module
Port is determined as main equipment by the internal USB interface that the USB switches switch connection, and by the first USB every
It is determined as by the external USB interface that the USB switches switch connection from equipment from the downstream port of module, to realize
The electrical isolation of the USB OTG interface；
The generic logic isolation module is also used to when the external USB interface accesses generic USB cable, is determined described logical
The high level signal of the external USB interface input is received with first pin of logic isolation module, and will be described logical
The high level signal that is generated with second pin of logic isolation module according to the high level signal of first pin and
The high level signal that first pin generates inputs the USB switching switch；
USB switching switch, is also used to respond the high level signal of first pin Yu second pin, Xiang Suoshu the
Two USB isolation modules input the second isolation signals, and second isolation signals are used to indicate selection the 2nd USB isolation module
Realize the electrical isolation of generic USB interface；
The 2nd USB isolation module, for responding second isolation signals, by the upstream of the 2nd USB isolation module
Port is determined as main equipment by the external USB interface that the USB switches switch connection, and by the 2nd USB every
It is determined as by the internal USB interface that the USB switches switch connection from equipment from the downstream port of module, to realize
The electrical isolation of the generic USB interface.
2. USB OTG interface isolation circuit according to claim 1, which is characterized in that the USB OTG interface isolation electricity
Road further includes power switching module, and the power switching module is electrically connected with the external USB interface, in which:
The generic logic isolation module is also used to the upper of the first USB isolation module in the first USB isolation module
Trip port is determined as main equipment by the inside USB interface of USB switching switch connection, and by the first USB
The downstream port of isolation module is determined as after equipment by the external USB interface that the USB switches switch connection, really
The third pin and the 4th pin of the fixed generic logic isolation module receive high level signal, and according to the third pin
High level signal and the 4th pin high level signal to the power switching module export connection signal；
The power switching module, for connecting the 5th pin and the 6th of the power switching module according to the connection signal
Pin, so that the internal USB interface is powered to the 6th pin.
3. USB OTG interface isolation circuit according to claim 2, it is characterised in that:
The generic logic isolation module is also used to the upper of the 2nd USB isolation module in the 2nd USB isolation module
Trip port is determined as main equipment by the external USB interface that USB switching switch connects, and by the 2nd USB
The downstream port of isolation module is determined as after equipment by the internal USB interface that the USB switches switch connection, really
The fixed third pin and the 4th pin receive low level signal, and according to the low level signal of the third pin with
And the low level signal of the 4th pin exports cut-off signal to the power switching module；
The power switching module is also used to be disconnected between the 5th pin and the 6th pin according to the cut-off signal
Connection so that the external USB interface is powered to the 6th pin.
4. USB OTG interface isolation circuit according to claim 3, which is characterized in that the power switching module is used for
Power supply on switch OTG line.
5. USB OTG interface isolation circuit according to any one of claims 1 to 4, which is characterized in that the USB switching
Switch includes front end USB switching switch and rear end USB switching switch, and the front end USB switching switch is isolated with the first USB
The downstream port of module is electrically connected, and the upstream port of the front end USB switching switch and the 2nd USB isolation module is electrically connected
It connects, the rear end USB switching switch is electrically connected with the upstream port of the first USB isolation module, and the rear end USB switching is opened
Pass is electrically connected with the downstream port of the 2nd USB isolation module.
6. USB OTG interface isolation circuit according to claim 5, which is characterized in that front end USB switching switch with
The external USB interface electrical connection, the rear end USB switching switch are electrically connected with the internal USB interface.
7. USB OTG interface isolation circuit according to claim 6, which is characterized in that the external USB interface is equipped with quiet
Electrical impedance device and EMI FILTER.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822122073.4U CN209231922U (en) | 2018-12-17 | 2018-12-17 | USB OTG interface isolation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822122073.4U CN209231922U (en) | 2018-12-17 | 2018-12-17 | USB OTG interface isolation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209231922U true CN209231922U (en) | 2019-08-09 |
Family
ID=67508115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822122073.4U Withdrawn - After Issue CN209231922U (en) | 2018-12-17 | 2018-12-17 | USB OTG interface isolation circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209231922U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109542822A (en) * | 2018-12-17 | 2019-03-29 | 广州吉欧电子科技有限公司 | A kind of USB OTG interface isolation circuit |
-
2018
- 2018-12-17 CN CN201822122073.4U patent/CN209231922U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109542822A (en) * | 2018-12-17 | 2019-03-29 | 广州吉欧电子科技有限公司 | A kind of USB OTG interface isolation circuit |
| CN109542822B (en) * | 2018-12-17 | 2024-03-12 | 广州吉欧电子科技有限公司 | USB OTG interface isolation circuit |
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