CN206363299U - A kind of control circuit of RAM card - Google Patents
A kind of control circuit of RAM card Download PDFInfo
- Publication number
- CN206363299U CN206363299U CN201720006006.9U CN201720006006U CN206363299U CN 206363299 U CN206363299 U CN 206363299U CN 201720006006 U CN201720006006 U CN 201720006006U CN 206363299 U CN206363299 U CN 206363299U
- Authority
- CN
- China
- Prior art keywords
- ram card
- control circuit
- power
- electric capacity
- card deck
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Abstract
The utility model embodiment discloses a kind of control circuit of RAM card.The circuit is applied to electronic equipment; the electronic equipment includes controller; the control circuit includes interface protection chip and RAM card deck; each signal end of the controller passes through interface protection chip connection corresponding with each pin of RAM card deck; the control circuit also includes power control circuit; the power control circuit is connected with the power end of the RAM card deck; the power-off of the power end and upper electricity are controlled for the end signal that resets according to the controller, is resetted by RAM card described in the power-off and upper electric control of the power end.The utility model embodiment realizes the control to electricity and power-off on RAM card deck by power control circuit, realizes the reset to RAM card, and the problem of artificial plug RAM card is needed when solving RAM card None- identified improves the convenience that RAM card is used.
Description
Technical field
The utility model embodiment is related to RAM card control technology, more particularly to a kind of RAM card control circuit.
Background technology
In the common electronic equipment such as mobile phone or camera, or in the master control borad of the industrial circles such as industrial control board, RAM card
All be conventional exterior storage medium, when run into RAM card plug after do not react the problem of when, through frequently with method be by
RAM card again plug once, the plug process of some mobile phone EMS memory cards also needs to the bonnet that shuts down or open, very not convenient, right
User causes certain puzzlement.
Utility model content
The utility model embodiment provides a kind of control circuit of RAM card, to realize to the power supply of RAM card and signal
Control.
The utility model embodiment provides a kind of control circuit of RAM card, and applied to electronic equipment, the electronics is set
Standby to include controller, the control circuit includes interface protection chip and RAM card deck, and each signal end of the controller leads to
Interface protection chip connection corresponding with each pin of RAM card deck is crossed, the control circuit also includes power supply electricity
Road, the power control circuit is connected with the power end of the RAM card deck, for being believed according to the reset terminal of the controller
The power-off of number control power end and upper electricity, it is multiple by RAM card deck described in the power-off and upper electric control of the power end
Position.
Further, the power control circuit includes positive or gate device, first resistor, second resistance, metal-oxide-semiconductor, the 3rd
Resistance and the first electric capacity；
Wherein, the first input end of the positive or gate device is connected by first resistor with the reset terminal of the controller,
The first resistor and the common port of the reset terminal are grounded by second resistance；
Second input of the positive or gate device is connected with the RAM card insertion detection signal end of the control circuit, is used
In the not upper electricity of power end for before RAM card insertion RAM card deck, keeping RAM card deck；
The output end of the positive or gate device is connected with metal-oxide-semiconductor grid, and the metal-oxide-semiconductor source class is connected with the first power supply, institute
Metal-oxide-semiconductor drain electrode is stated to be connected with the power end of the RAM card deck, 3rd resistor be connected to the metal-oxide-semiconductor grid and source electrode it
Between；
The power end of the positive or gate device connects the first power supply and passes through the first capacity earth；
The grounding ports ground connection of the positive or gate device.
Further, the power control circuit also includes the second electric capacity, and the second electric capacity is in parallel with the 3rd resistor.
Further, the first output end of the interface protection chip is connected with RAM card insertion detection signal end, and is passed through
Reverser is connected with the Enable Pin of the interface protection chip, RAM card insertion detection signal end by after the 4th resistance with
The first input end connection of the RAM card deck, for before RAM card insertion RAM card deck, keeping RAM card
The not upper electricity of each pin of deck.
Further, the data input pin of the interface protection chip, command input end mouthful and input end of clock mouthful with
The controller connection；
Data output end, order output terminal mouthful and the output terminal of clock mouthful of the interface protection chip and the RAM card
Deck is connected；
The first voltage port of the interface protection chip is connected with second source, by being grounded after the 5th electric capacity；
The second voltage port of the interface protection chip and the first power sources in series, by being grounded after the 6th electric capacity.
Further, the controller includes micro-control unit, field programmable gate array or Advanced Reduced Instruction Set meter
Any one in calculation machine.
Further, it is grounded after the chip power end of the RAM card deck is connected with the 3rd electric capacity, the 4th electric capacity and institute
State the 3rd electric capacity in parallel.
The utility model embodiment realizes the control to electricity and power-off on RAM card deck by power control circuit, realizes
Reset to RAM card, the problem of artificial plug RAM card is needed when solving RAM card None- identified, improving RAM card makes
Convenience.
Brief description of the drawings
Fig. 1 be the utility model embodiment one in a kind of RAM card control circuit diagram；
Fig. 2 is the power control circuit schematic diagram in the utility model embodiment one；
Fig. 3 is a kind of control circuit diagram of RAM card in the utility model embodiment two.
Embodiment
The utility model is described in further detail with reference to the accompanying drawings and examples.It is understood that herein
Described specific embodiment is used only for explaining the utility model, rather than limits of the present utility model.Further need exist for
It is bright, for the ease of description, the part related to the utility model rather than entire infrastructure are illustrate only in accompanying drawing.
Embodiment one
Fig. 1 is a kind of control circuit diagram of RAM card in the utility model embodiment one, and the circuit is applied to electric
Sub- equipment, the electronic equipment includes controller, and the control circuit includes interface protection chip 10 and RAM card deck 20, control
Each signal end of device processed is also included by the connection corresponding with each pin of RAM card deck 20 of interface protection chip 10, control circuit
Power control circuit 30, power control circuit 30 is connected with the power end of RAM card deck 20, for the reset according to controller
The power-off of end signal control power end and upper electricity, are resetted by the power-off and upper electric control RAM card deck 20 of power end.
Wherein, interface protection chip can be used for the RAM card with being inserted in RAM card deck to carry out data transmission, and can select
Multiple Type, for example, can be TXS0206, and RAM card deck can be specifically SD card deck, can be inserted into SD card.Power supply electricity
Road is used to control the power-off of RAM card deck power end and upper electricity, realizes the reset of RAM card deck, equivalent to by RAM card card
Seat has been restarted once, when there is RAM card in None- identified in the case of non-damaging, reaches the purpose of reset.
Specifically, as shown in Fig. 2 power control circuit 30 includes positive or gate device U1, first resistor R1, second resistance
R2, metal-oxide-semiconductor Q1,3rd resistor R3 and the first electric capacity C1；
Wherein, positive or gate device U1 first input end A is connected by the reset terminal of first resistor R1 and controller, and first
The common port of resistance R1 and reset terminal is grounded by second resistance R2；
Positive or gate device U1 the second input B with control circuit RAM card insertion detection signal end be connected, for
Before RAM card insertion RAM card deck 20, the not upper electricity of RAM card deck power end is kept；
Positive or gate device U1 output end Y is connected with metal-oxide-semiconductor Q1 grids, and metal-oxide-semiconductor Q1 source class and the first power supply VCC_3V3 connect
Connect, metal-oxide-semiconductor Q1 drain electrodes are connected with RAM card deck power end, and 3rd resistor R3 is connected between metal-oxide-semiconductor Q1 grids and source electrode；
Positive or gate device U1 power end VCC connections the first power supply VCC_3V3 is simultaneously grounded by the first electric capacity C1；
Positive or gate device U1 grounding ports GND ground connection.
It is in parallel with 3rd resistor R3 that power control circuit also includes the second electric capacity C2, the second electric capacity C2.
In the power control circuit of the utility model embodiment, when there is RAM card None- identified in the case of non-damaging
When, controller can internally deposit card by pulling up the reset end signal of controller and be resetted, when the reset end signal of controller is
During high level, U1 outputs Y is high level, and metal-oxide-semiconductor is closed, and RAM card loses power supply, then the reset end signal of controller is dragged down
For low level, RAM card is re-powered, you can the purpose for resetting RAM card is reached, it is achieved thereby that the cold reset work(of RAM card
Can, it is to avoid the inconvenience that artificial plug RAM card is brought.
The utility model embodiment realizes the control to electricity and power-off on RAM card deck by power control circuit, realizes
Reset to RAM card, the problem of artificial plug RAM card is needed when solving RAM card None- identified, improving RAM card makes
Convenience.
Embodiment two
On the basis of above-described embodiment, Fig. 3 is a kind of control circuit of RAM card in the utility model embodiment two
Schematic diagram, in the present embodiment, is described in detail so that RAM card is SD card as an example.
As shown in figure 3, power control circuit 30 includes positive or gate device U1, first resistor R1, second resistance R2, metal-oxide-semiconductor
Q1,3rd resistor R3 and the first electric capacity C1；
Wherein, positive or gate device U1 first input end A passes through first resistor R1 and the reset terminal SDIO_RET of controller
The common port of connection, first resistor R1 and reset terminal is grounded by second resistance R2；
Wherein, first resistor R1 and second resistance R2 resistance and the big I of the first electric capacity are carried out according to the actual requirements
Selection, exemplarily, optional 33 Europe of first resistor R1, optional 10 kilo-ohms of second resistance R2, the size of the first electric capacity can be
100nF/16V。
Positive or gate device U1 the second input B is connected with controlling the RAM card of circuit to insert detection signal end SDIO_CD,
The not upper electricity of power end VDD for before RAM card insertion RAM card deck 20, keeping RAM card deck 20；
Positive or gate device U1 output end Y is connected with metal-oxide-semiconductor Q1 grids, and metal-oxide-semiconductor Q1 source class and the first power supply VCC_3V3 connect
Connect, metal-oxide-semiconductor Q1 drain electrodes are connected with the power end VDD of RAM card deck 20, and 3rd resistor R3 is connected to metal-oxide-semiconductor Q1 grids and source electrode
Between；
Wherein, 3rd resistor R3 resistances can be selected according to the actual requirements, exemplarily, 3rd resistor R3 optional 10,000
Europe.
Positive or gate device U1 power end VCC connections the first power supply VCC_3V3 is simultaneously grounded by the first electric capacity C1；
Positive or gate device U1 grounding ports GND ground connection.
Wherein, metal-oxide-semiconductor can be PMOS, exemplarily, and model can be NTA4151PT1G.In the prior art, if
SD card insertion after due to system is unstable or other reasonses lead to not identification when, it is necessary to whole system power-off restarting or plug
SD card could be solved, and plug can lift the probability for damaging SD card again.The power control circuit of the utility model embodiment
In, when there is SD card in None- identified in the case of non-damaging, controller can be carried out by pulling up SDIO_RET signals to SD card
Reset, when SDIO_RET signals are high level, U1 outputs Y is high level, and metal-oxide-semiconductor closure, SD card loses power supply, then will
SDIO_RET signals re-power SD card down for low level, you can reach the purpose for resetting SD card.Realize the cold of SD card
Reset function, it is to avoid the inconvenience that artificial plug SD card is brought.
It is in parallel with 3rd resistor R3 that power control circuit also includes the second electric capacity C2, the second electric capacity C2.
Wherein, the second electric capacity C2 effect is metal-oxide-semiconductor Q1 is slowly opened, because while metal-oxide-semiconductor Q1 is opened, due to
The capacitive load of rear end SD card needs charging, moment can produce larger current spike, it may be possible to more than 10 times of operating current,
It is easily damaged SD card and interface circuit.It is also in this way, can also produce current spike in SD card insertion moment in prior art designs.And
Add after electric capacity C2, Q1 shows certain impedance during opening, because supply voltage is constant, resistance becomes big
The size of current spike can be limited, is conducive to protection SD card and interface circuit.C2 big I is chosen according to the actual requirements,
Exemplarily, C2 size is 10 μ F/16V.
First output end CD of interface protection chip 10 is connected with RAM card insertion detection signal end SDIO_CD, and through anti-
It is connected to device U3 with the Enable Pin EN of interface protection chip, RAM card insertion detection signal end SDIO_CD passes through the 4th resistance R4
It is connected afterwards with the first input end CD of RAM card deck 20, for before RAM card insertion RAM card deck 20, keeping internal memory
The not upper electricity of each pin of card deck 20.
Wherein, in the prior art, RAM card deck 20 is remained is connected with power supply, with interface protection chip 10 also all the time
Keep signal interaction, although interface protection chip 10 possesses a certain degree of electrostatic ability to bear, but during plug still
SD card and interface protection chip 10 may so be damaged.The RAM card insertion detection inverted device U3 of signal end SDIO_CD are linked into
The Enable Pin EN and U1 of interface protection chip 10 B ends, before insertion SD card, due in the CD pins of interface protection chip 10
Pull-up resistor is put, SDIO_CD can be given tacit consent to by CD pins to be pulled up, and low level, interface are converted to after showing as high level, inverted device
Protect the Enable Pin EN of chip 10 to be enabled for high level, now will not connect signal on the pin of RAM card deck 20, meanwhile, by
It is an OR gate in U1, when the input of B ends is high level, exports Y necessarily high level, metal-oxide-semiconductor Q1 is not turned on, that is to say, that
RAM card deck 20 will not switch on power.After SD card is inserted, SDIO_CD can be pulled to low electricity by the CD ends of RAM card deck 20
Flat, U1 pin A acquiescences are low levels, then it is low level to export Y, and metal-oxide-semiconductor can be turned on, and SD card is powered, while interface protection core
The Enable Pin EN of piece 10 is enabled, and all signals can all be connected, now SD card normal work, due to during insertion, interface
Non-transformer no signal, will not produce moment electric spark, and equipment is more safe and reliable.
Data input pin DAT0A, DAT1A, DAT3A and DAT4A of interface protection chip 10, command input end mouthful CMDA with
And clock input port CLKA is connected with the controller；
Wherein, the data input pin DAT0A of interface protection chip 10, DAT1A, DAT3A, DAT4A, command input end mouthful
The PS_SDIO_ of CMDA and input end of clock mouthful CLKA respectively after resistance R5, R7, R8, R11, R13 and R15 with controller
IO0, PS_SDIO_IO1, PS_SDIO_IO2, PS_SDIO_IO3, PS_SDIO_CMD and PS_SDIO_CLK are sequentially connected.
Data output end DAT0B0, DAT1B0, DAT3B0 and DAT4B0 of interface protection chip 10, order output terminal mouthful
CMDB0 and output terminal of clock mouthful CLKB0 are connected with the RAM card deck 20；
Wherein, data output end DAT0B0, DAT1B0, DAT3B0, DAT4B0, the order output terminal of interface protection chip 10
Mouthful CMDB0 and output terminal of clock mouthful CLKB0 after resistance R6, R9, R10, R12, R14 and R16 with RAM card deck 20
DAT0, DAT1, DAT2, DAT3, CMD and CLK are sequentially connected.
Wherein, resistance R4-R16 resistance can be chosen according to the actual requirements, exemplarily, can be chosen for 33
Europe.
The first voltage port VCCA of interface protection chip 10 is connected with second source VCC_1V8, passes through the 5th electric capacity C5
After be grounded；
The second voltage port VCCB0 of interface protection chip 10 connects with the first power supply VCC_3V3, passes through the 6th electric capacity C6
After be grounded.
Wherein, the 5th electric capacity C5 and the 6th electric capacity C6 big I is selected according to the actual requirements, exemplarily, and the 5th
Electric capacity C5 and the 6th electric capacity C6 size can be 100nF/50V.
Controller includes micro-control unit (Microcontroller Unit, MCU), field programmable gate array
Any one in (Field-Programmable Gate Array, FPGA) or advanced RISC machines ARM.
The chip power end VDD of RAM card deck 20 is grounded after being connected with the 3rd electric capacity C3, the 4th electric capacity C4 and described the
Three electric capacity C3 are in parallel.
Wherein, the 3rd electric capacity C3 and the 4th electric capacity C4 big I is selected according to the actual requirements, exemplarily, and the 3rd
Electric capacity C3 size can be 100nF/50V, and the 4th electric capacity C4 size can be 10 μ F/16V.
The utility model embodiment realizes the control to electricity and power-off on RAM card deck by power control circuit, realizes
Reset to SD card, the problem of artificial plug SD card is needed when solving SD card None- identified improves the facility that SD card is used
Property.Increase interface protection function simultaneously, it is ensured that the power supply of SD card can be just opened after fully-inserted SD card, be also turned on reading and writing SD
The signal of card, it is to avoid the electric spark damage SD card that is powered during plug due to electrostatic or moment and damage asking for control panel
Topic, improves security.
Note, above are only preferred embodiment of the present utility model and institute's application technology principle.Those skilled in the art's meeting
Understand, the utility model is not limited to specific embodiment described here, can carried out for a person skilled in the art various bright
Aobvious change, readjust and substitute without departing from protection domain of the present utility model.Therefore, although pass through above example
The utility model is described in further detail, but the utility model is not limited only to above example, is not departing from
In the case that the utility model is conceived, other more equivalent embodiments can also be included, and scope of the present utility model is by appended
Right determine.
Claims (7)
1. a kind of control circuit of RAM card, applied to electronic equipment, the electronic equipment includes controller, the control circuit
Including interface protection chip and RAM card deck, each signal end of the controller passes through the interface protection chip and RAM card
Each pin correspondence of deck is connected, it is characterised in that the control circuit also includes power control circuit, the power supply electricity
Road is connected with the power end of the RAM card deck, and the power end is controlled for the end signal that resets according to the controller
Power-off and upper electricity, are resetted by RAM card deck described in the power-off and upper electric control of the power end.
2. control circuit according to claim 1, it is characterised in that the power control circuit include positive or gate device,
First resistor, second resistance, metal-oxide-semiconductor, 3rd resistor and the first electric capacity；
Wherein, the first input end of the positive or gate device is connected by first resistor with the reset terminal of the controller, described
First resistor and the common port of the reset terminal are grounded by second resistance；
Second input of the positive or gate device with it is described control circuit RAM card insertion detection signal end be connected, for
Before the RAM card insertion RAM card deck, the not upper electricity of power end of RAM card deck is kept；
The output end of the positive or gate device is connected with metal-oxide-semiconductor grid, and the metal-oxide-semiconductor source class is connected with the first power supply, the MOS
Pipe drain electrode is connected with the power end of the RAM card deck, and 3rd resistor is connected between the metal-oxide-semiconductor grid and source electrode；
The power end of the positive or gate device connects the first power supply and passes through the first capacity earth；
The grounding ports ground connection of the positive or gate device.
3. control circuit according to claim 2, it is characterised in that the power control circuit also includes the second electric capacity,
Second electric capacity is in parallel with the 3rd resistor.
4. control circuit according to claim 2, it is characterised in that the first output end of the interface protection chip with it is interior
Card insertion detection signal end connection is deposited, and is connected through reverser with the Enable Pin of the interface protection chip, the RAM card is inserted
Enter to detect signal end by being connected after the 4th resistance with the first input end of the RAM card deck, for being inserted in the RAM card
Enter before RAM card deck, keep the not upper electricity of each pin of RAM card deck.
5. control circuit according to claim 2, it is characterised in that the data input pin of the interface protection chip, life
Input port and input end of clock mouthful is made to be connected with the controller；
Data output end, order output terminal mouthful and the output terminal of clock mouthful of the interface protection chip and the RAM card deck
Connection；
The first voltage port of the interface protection chip is connected with second source, by being grounded after the 5th electric capacity；
The second voltage port of the interface protection chip and the first power sources in series, by being grounded after the 6th electric capacity.
6. according to any described control circuits of claim 1-5, it is characterised in that the controller include micro-control unit,
Any one in field programmable gate array or advanced RISC machines.
7. control circuit according to claim 6, it is characterised in that the chip power end and the 3rd of the RAM card deck
It is grounded after electric capacity series connection, the 4th electric capacity is in parallel with the 3rd electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720006006.9U CN206363299U (en) | 2017-01-04 | 2017-01-04 | A kind of control circuit of RAM card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720006006.9U CN206363299U (en) | 2017-01-04 | 2017-01-04 | A kind of control circuit of RAM card |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206363299U true CN206363299U (en) | 2017-07-28 |
Family
ID=59378266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720006006.9U Expired - Fee Related CN206363299U (en) | 2017-01-04 | 2017-01-04 | A kind of control circuit of RAM card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206363299U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110175481A (en) * | 2019-06-25 | 2019-08-27 | 深圳市亿道信息股份有限公司 | Card reader control system |
-
2017
- 2017-01-04 CN CN201720006006.9U patent/CN206363299U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110175481A (en) * | 2019-06-25 | 2019-08-27 | 深圳市亿道信息股份有限公司 | Card reader control system |
| CN110175481B (en) * | 2019-06-25 | 2023-11-17 | 深圳市亿道信息股份有限公司 | Card reader control system |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170728 Termination date: 20220104 |
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| CF01 | Termination of patent right due to non-payment of annual fee |