CN206532281U

CN206532281U - Can a key enter reforestation practices E-book reader

Info

Publication number: CN206532281U
Application number: CN201720047617.8U
Authority: CN
Inventors: 林庆元
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-01-16
Filing date: 2017-01-16
Publication date: 2017-09-29
Anticipated expiration: 2027-01-16

Abstract

The utility model discloses it is a kind of can a key enter reforestation practices E-book reader, including the main control chip and power button being arranged on E-book reader body, USB interface and reset terminal pin are provided with main control chip, the input of USB interface is electrically connected with the input of reset terminal pin, and the firmware of main control chip can detect the level change on reset terminal pin on startup；Power button is electrically connected with the input of main control chip.The utility model is only with a power button, coordinate the reset terminal pin on main control chip and main control chip, in usual start, reset terminal pin is high level, will not enter reforestation practices, after PC is connected, the USB port of PC controls the reset terminal pin of main control chip to be low level, and main control chip detects the action of power button, presses power button if detecting, main control chip enters reforestation practices；If detecting and not pressing power button, main control chip normal boot-strap, and enter connection PC state.

Description

Can a key enter reforestation practices E-book reader

Technical field

The utility model is related to E-book reader technical field, more particularly to it is a kind of can a key enter the electricity of reforestation practices Philosophical works reader.

Background technology

Electronic reader reforestation practices, are also called burning pattern, downloading mode either Recovery patterns, work as e-book When reader needs to update firmware again, often E-book reader by USB connection computers, by computer Instrument downloads to new firmware in E-book reader, enters this program state or download state, is called recovery mould Formula.

Traditional E-book reader, user, which enters reforestation practices, following three kinds of modes：

1）The recovery button beyond power button is pinned, PC is reconnected, into burning pattern, which includes a power supply Button and a recovery button；

2）Two common key-press beyond power key are pinned simultaneously, PC is reconnected, and into burning pattern, which includes two Individual common key-press and a power button；

3）Common key-press is pinned, PC is connected, then continuously presses one or many power keys, into burning pattern, which bag Include a common key-press and a power button.

More than three kinds enter reforestation practices mode, it is necessary at least two buttons can just realize reforestation practices, operation Not enough facilitate.

Utility model content

For weak point present in above-mentioned technology, the utility model provide it is a kind of can a key enter the electricity of reforestation practices Philosophical works reader, it is easy to operate and cost-effective only with a button.

To achieve the above object, the utility model provide it is a kind of can a key enter reforestation practices E-book reader, bag Include be provided with the main control chip and power button being arranged on E-book reader body, the main control chip USB interface and Reset terminal pin, the input of the USB interface is electrically connected with the input of reset terminal pin；The power button and main control chip Input is electrically connected, and the actuating signal of the power button is sent to main control chip processing, and the main control chip detection power supply is pressed Whether key has action, and main control chip control enters reforestation practices or enters normal boot-strap pattern.

Wherein, the reader also includes PMU, the input electricity of the power button and PMU Connection, and the PMU passes through universal serial bus and main control chip interactive connection；The actuating signal of the power button It is sent to after PMU processing, is sent to main control chip.

Wherein, the USB interface is provided with power line, first data transmission line, the second data line and ground wire, and Metal-oxide-semiconductor is connected between power line and the reset terminal pin；The grid of the metal-oxide-semiconductor is connected with power line, the leakage of the metal-oxide-semiconductor Pole is connected with reset terminal pin, and the source ground of the metal-oxide-semiconductor；After the USB port of USB interface connection PC, described the Second end pin of one data line and USB port is connected, and the 3rd end pin of second data line and USB port connects Connect, and be grounded after the ground wire and USB the 5th end pin connection.

Wherein, first resistor and second resistance, the first resistor are also associated between power line and the reset terminal pin One end be connected with power line, the other end of the first resistor is connected with one end of second resistance and the grid of metal-oxide-semiconductor respectively, And the other end ground connection of the second resistance.

The beneficial effects of the utility model are：Compared with prior art, what the utility model was provided can key entrance recovery The E-book reader of pattern, the input of USB interface is electrically connected with the input of reset terminal pin, and the firmware of main control chip is being opened The level change on reset terminal pin can be detected when dynamic；The actuating signal of power button is sent to main control chip processing so that main Whether control chip detection power button has action；Usually start is that the USB interface of the E-book reader is not connected to the USB of PC During port, reset terminal pin is high level, will not enter reforestation practices, when the E-book reader by USB interface connects PC USB port after, it is low level that the USB port of PC, which controls the reset terminal pin of main control chip, and main control chip detection power supply is pressed The action of key, power button is pressed if detecting, and main control chip enters reforestation practices；If detect do not press power supply by Key, then main control chip normal boot-strap, and enter connection PC state.It is of the present utility model can a key enter reforestation practices electronics Book reader coordinates the reset terminal pin on main control chip and main control chip only with a power button, you can realizes and recovers Mode capabilities, have saved the cost of at least one button, easy to operate, and cause the good appearance of the reader.

Brief description of the drawings

Fig. 1 for it is of the present utility model can a key enter reforestation practices E-book reader connection PC after structural representation Figure；

Fig. 2 for it is of the present utility model can a key enter reforestation practices E-book reader connection PC after circuit theory Figure.

Main element symbol description is as follows：

10th, main control chip 11, power button

12nd, PC 13, PMU

101st, usb 1 02, reset terminal pin

121st, USB port.

Embodiment

In order to more clearly state the utility model, the utility model is further described below in conjunction with the accompanying drawings.

Referring to Fig. 1, it is of the present utility model can a key enter the E-book readers of reforestation practices, including be arranged on electronics Usb 1 01 and reset terminal pin are provided with main control chip 10 and power button 11 on book reader body, main control chip 10 102, the input of usb 1 01 is electrically connected with the input of reset terminal pin 102；Power button 11 is defeated with main control chip 10 Enter end electrical connection, the actuating signal of power button 11 is sent to main control chip 10 and handled, the detection power button 11 of main control chip 10 Whether action is had, and the control of main control chip 10 enters reforestation practices or enters normal boot-strap pattern.

Compared with prior art, the utility model provide can a key enter the E-book readers of reforestation practices, USB connects The input of mouth 101 is electrically connected with the input of reset terminal pin 102, and the firmware of main control chip 10 can detect recovery on startup Hold the level change on pin 102；The actuating signal of power button 11 is sent to main control chip 10 and handled so that main control chip 10 is examined Survey whether power button 11 has action；Usually start is that the usb 1 01 of the E-book reader is not connected to the USB of PC 12 During port 121, reset terminal pin 102 is high level, will not enter reforestation practices, when the E-book reader passes through usb 1 01 After the USB port 121 for connecting PC 12, the reset terminal pin 102 of the control main control chip 10 of USB port 121 of PC 12 is low electricity It is flat, and main control chip 10 detects the action of power button 11, and power button 11 is pressed if detecting, main control chip 10 enters extensive Complex pattern；If detecting and not pressing power button 11, the normal boot-strap of main control chip 10, and enter the connection state of PC 12. It is of the present utility model can a key enter reforestation practices E-book reader only with a power button 11, coordinate master control core Reset terminal pin 102 on piece 10 and main control chip 10, you can realize reforestation practices function, saved at least one button into This, it is easy to operate, and cause the good appearance of the reader.

In the present embodiment, the reader also includes PMU 13, power button 11 and PMU 13 Input is electrically connected, and PMU 13 is interconnected by universal serial bus I2C with main control chip 10；Power button 11 Actuating signal is sent to after the processing of PMU 13, is sent to main control chip 10.PMU 13 is prior art Main control chip 10 is sent to after unit in middle E-book reader, the input signal for handling power button 11.

Referring to Fig. 2, usb 1 01 is provided with power line VBUS, first data transmission line D-, the second data line D + metal-oxide-semiconductor Q1 is connected between ground wire GND, and power line VBUS and reset terminal pin 102；Metal-oxide-semiconductor Q1 grid respectively with The first end pin of USB port 121 and power line VBUS connections, metal-oxide-semiconductor Q1 drain electrode is connected with reset terminal pin 102, and metal-oxide-semiconductor Q1 Source ground；After the USB port 121 of the connection PC 12 of usb 1 01, first data transmission line D- and USB port 121 Second end pin connection, the second data line D+ is connected with the 3rd end pin of USB port 121, and the of ground wire GND and USB It is grounded after five end pin connections.4th end pin of USB port 121 is hanging, the 5th end pin of USB port 121 and the 6th end pin, the 7th Hold and be grounded after pin and ground wire GND connections, and USB port 121 the 8th end pin be connected with the 9th end pin after ground connection.Connect PC When 12, the power line USB5V of USB port 121 is controlled reset terminal pin 102 for low level, now, master control core by metal-oxide-semiconductor Q1 Piece 10 determines reset terminal pin 102 for low level, and main control chip 10 can further detect power button 11, be pressed if detecting Power button 11, then into reforestation practices；If detect and do not press power button 11, and main control chip 10 waits time-out, then Main control chip 10 controls normal boot-strap, and into the state of connection PC 12, certainly, the power line VBUS of usb 1 01 passes through Reset terminal pin 102 is low level or the magnitude of voltage of setting by metal-oxide-semiconductor Q1.

In the present embodiment, first resistor R1 and second resistance R2 are also associated between power line VBUS and reset terminal pin 102, First resistor R1 one end is connected with power line VBUS, the first resistor R1 other end and second resistance R2 one end and metal-oxide-semiconductor Q1 grid connection, and second resistance R2 other end ground connection.First resistor R1 and second resistance R2 is the metering function.

Disclosed above is only several specific embodiments of the present utility model, but the utility model is not limited to this, The changes that any person skilled in the art can think of should all fall into protection domain of the present utility model.

Claims

1. it is a kind of can a key enter reforestation practices E-book reader, it is characterised in that including being arranged on E-book reader USB interface and reset terminal pin, the USB interface are provided with main control chip and power button on body, the main control chip Input electrically connected with the input of reset terminal pin；The power button is electrically connected with the input of main control chip, the electricity The actuating signal of source button is sent to main control chip processing, and whether the main control chip detection power button has action, and described Main control chip control enters reforestation practices or enters normal boot-strap pattern.

2. it is according to claim 1 can a key enter reforestation practices E-book reader, it is characterised in that the reader Also include PMU, the power button is electrically connected with the input of PMU, and the power management list Member is interconnected by universal serial bus and main control chip；The actuating signal of the power button is sent to PMU processing Afterwards, it is sent to main control chip.

3. it is according to claim 1 can a key enter reforestation practices E-book reader, it is characterised in that the USB Interface is provided with power line, first data transmission line, the second data line and ground wire, and the power line and reset terminal pin Between be connected with metal-oxide-semiconductor；The grid of the metal-oxide-semiconductor is connected with power line, and the drain electrode of the metal-oxide-semiconductor is connected with reset terminal pin, and The source ground of the metal-oxide-semiconductor；After the USB port of the USB interface connection PC, the first data transmission line and USB ends Second end pin connection of mouth, the 3rd end pin connection of second data line and USB port, and the ground wire and USB The 5th end pin connection after be grounded.

4. it is according to claim 3 can a key enter reforestation practices E-book reader, it is characterised in that the power supply First resistor and second resistance are also associated between line and reset terminal pin, one end of the first resistor is connected with power line, institute The grid for stating the other end of first resistor and one end of second resistance and metal-oxide-semiconductor is connected, and another termination of the second resistance Ground.