CN107329918B - Interface circuit for realizing forward and reverse insertion of tablet equipment and keyboard base - Google Patents

Interface circuit for realizing forward and reverse insertion of tablet equipment and keyboard base Download PDF

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Publication number
CN107329918B
CN107329918B CN201710538657.7A CN201710538657A CN107329918B CN 107329918 B CN107329918 B CN 107329918B CN 201710538657 A CN201710538657 A CN 201710538657A CN 107329918 B CN107329918 B CN 107329918B
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interface
pin
pins
flat
circuit
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CN107329918A (en
Inventor
张治宇
钟景维
石庆
马保军
刘远贵
王倩
安帅
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Shenzhen Emdoor Information Co ltd
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Shenzhen Emdoor Information Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/42—Bus transfer protocol, e.g. handshake; Synchronisation
    • G06F13/4282—Bus transfer protocol, e.g. handshake; Synchronisation on a serial bus, e.g. I2C bus, SPI bus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2213/00—Indexing scheme relating to interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F2213/0042—Universal serial bus [USB]

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Power Sources (AREA)

Abstract

The invention provides an interface circuit for realizing forward and reverse insertion of a tablet device and a keyboard base, and belongs to the field of tablet device circuits. The invention comprises a flat-plate end interface circuit, a flat-plate end adapter plate circuit, a base rotating shaft plate circuit and a keyboard base end interface circuit, wherein the flat-plate end interface circuit is used for connecting various signals of a main control end to the flat-plate end adapter plate; the flat-end adapter plate circuit is used for transferring various signals of the flat end to the double-row spring thimble connector through a special flat cable; the base adapter plate circuit is in physical contact with the double-row spring thimble connector and receives all groups of signals on the flat-plate-end adapter plate; the keyboard base end interface circuit is used for converting various signals transferred by the base rotating shaft plate into different expansion ports through each conversion module. The double-row spring thimble connector is adopted, so that the charging capacity can be increased, more signal transmission can be compatible, and a foundation is provided for abundant expansion functions of the base.

Description

Interface circuit for realizing forward and reverse insertion of tablet equipment and keyboard base
Technical Field
The invention relates to a flat-panel device circuit, in particular to an interface circuit for realizing forward and reverse insertion of a flat-panel device and a keyboard base.
Background
Along with the continuous change development of the product form, a novel product form of 2 in 1 gradually appears on the basis of the product form of a tablet and a notebook. The tablet is used as a main control device to process data, and the keyboard base is used as a controlled device to be compatible with the expansion functions of touch pad input, USB input and output and the like. The product can be used as a tablet device alone or as a desktop device by being connected with a keyboard base. However, the keyboard base interface on the market is relatively single in function and is only used as a passive input device. The keyboard base during operation has increased the whole consumption of dull and stereotyped, has reduced battery duration. In addition, the flat screen can only be inserted for use by a user, and cannot be used as a display screen for other people.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an interface circuit for realizing forward and reverse insertion of a tablet device and a keyboard base.
The invention comprises a flat-plate end interface circuit, a flat-plate end adapter plate circuit, a base rotating shaft plate circuit and a keyboard base end interface circuit, wherein the flat-plate end interface circuit is used for connecting a USB signal of a main control end, a system management bus signal of a battery, a detection signal and an input/output power supply signal to the flat-plate end adapter plate; the flat-end adapter plate circuit is used for transferring various signals of the flat end to the double-row spring thimble connector through a special flat cable; the base adapter plate circuit is in physical contact with the double-row spring thimble connector and receives all groups of signals on the flat-plate-end adapter plate; the keyboard base end interface circuit is used for converting various signals transferred by the base rotating shaft plate into different expansion ports through each conversion module.
The invention is further improved, the flat-panel end interface circuit comprises a connector J1, a power supply module and a communication module which is respectively connected with the flat-panel main control and the connector J1.
The invention is further improved, the interface of the connector J1 comprises 20 pins, wherein the 14 th pin and the 15 th pin are defined as USB signal pins and are used for transmitting information of all keyboard base USB devices; pins 8 and 9 are defined as system management bus signal pins of the battery; the 11 th pin is defined as a battery detection signal pin and is used for reporting the insertion or extraction state of a battery at the base end of the keyboard; the 20 th pin is defined as a base detection signal pin and is used for reporting whether the keyboard base is connected with the flat plate end or not; the 12 th pin is defined as an LED signal pin and is used for indicating the charging and discharging states of the battery of the keyboard base; the power signals are divided into three groups: pins 1 and 2 are defined as VCC_AC pins for the cradle to charge the tablet; pins 6 and 7 are defined as VC_BAT2 pins for the base battery to supply power to the tablet terminal; the 16 th pin is defined as a VDOCK_5V pin and is used for supplying power to the base peripheral equipment by the panel end; pins 3, 4, 5, 10, 13, 17 are defined as GND pins, providing a return path for each set of signals.
The invention further improves, the power supply module comprises a switch tube Q3 and a power chip U1, wherein the G pole of the switch tube Q3 is connected with the 20 th pin of the connector J1, the S pole of the switch tube Q3 is grounded, the D pole of the switch tube Q3 is connected with the enabling end of the pin 6 of the power chip U1, the pin 2 of the power chip U1 is a power input end, and the pin 3 of the power chip U1 is an output end.
The invention further improves, also comprises a switch module supporting Windows continuous function, the switch module is respectively connected with the DOCK_DET pin of the panel master control and the connector J1, the switch module comprises a switch tube Q1, the G electrode of the switch tube Q1 is connected with the pin 20 of the connector J1, the D electrode of the switch tube Q1 is connected with the DOCK_DET pin of the panel master control, and the S electrode of the switch tube Q1 is grounded.
The invention further improves, the flat-end adapter board circuit comprises an interface J4 and double-row spring thimble connectors J2 and J3 which are connected with each other, wherein the interface J4 is matched with an interface pin of the connector J1 and is used for being connected with the connector J1, and the pin definitions of the interface J2 and the interface J3 of the double-row spring thimble connectors are symmetrically processed.
According to the invention, the B14, B9 and B6 pins of the interface J2 and the A14, A9 and A6 pins of the interface J3 are grounded pins, the B13 and A13 pins of the interface J2 and the A13 pin of the interface J3 are connected with the pin 12 of the interface J4, the B12 and A12 pin of the interface J2 and the A12 pin of the interface J3 are connected with the pin 11 of the interface J4, the B11 and A11 pin of the interface J2 and the A11 pin of the interface J3 are defined as VCC_AC pins, the B10 and A10 pins of the interface J2 and the A10 pin of the interface J3 are connected with the pin 20 of the interface J4, the B8, B7 and B1 interfaces of the interface J2 are idle, the A8 and A7 interfaces of the interface J3 are respectively connected with the 14 th pin and the 15 pin of the interface J4, the A1 interface J3 is grounded through a resistor, the B5 and A5 pin of the interface J2 and the A3 are defined as VCC_BAT2 pin, the B4 and the A4 pin of the interface J2 and the A4 pin of the interface J3 are defined as VCC_ACpin, and the B4 pin of the interface J2 and the B4 pin of the interface J2 and the interface 3 pin 3 are connected with the pin 9 pin of the interface J2.
The invention further improves, the base rotating shaft board circuit comprises double-row spring thimble connectors J5 and J6, a power signal interface J7, other signal interfaces J8 and an analog switch module, wherein the double-row spring thimble connectors J5 and J6 are connected with double-row spring thimble connectors J2 and J3, the power signal interface J7 is connected with power pins of the double-row spring thimble connectors J5 and J6, pins 6 and 7 of the other signal interfaces J8 are connected with pins B7 and B8 of an interface J5 of the double-row spring thimble connectors and pins A7 and A8 of the interface J6 through the analog switch module, and other signal pins of the double-row spring thimble connectors J5 and J6 are connected with other signal interfaces J8.
The invention is further improved, and the definition of the double-row spring thimble connectors J5 and J6 and the definition of the double-row spring thimble connectors J2 and J3 are only different in that: the pins B10 and A10 of the double-row spring thimble connectors J5 and J6 are connected with a pull-down resistor, the pins B7, B8, A7 and A8 are all defined as USB signal pins, and the pin A1 is defined as a polarity detection signal pin; the analog switch module comprises an analog switch U2 and a switch tube Q5, wherein the G pole of the switch tube Q5 is connected with an A1 pin, the D pole of the switch tube Q5 is respectively connected with a power supply and a10 th pin of the analog switch, the S pole of the switch tube Q5 is grounded, input pins 4, 5, 6 and 7 of the analog switch U2 are respectively connected with double-row spring thimble connectors J5 and J6, and output pins 1 and 2 of the analog switch U2 are connected with an interface J8.
The invention further improves, the keyboard base interface circuit comprises an interface J10, an interface J11, a VCC-AC interface module and a battery interface module, wherein the definition of the interface J10 is consistent with that of the interface J7, the definition of the interface J11 is consistent with that of the interface J8, the VCC-AC interface module is connected with a VCC-AC pin of the interface J10, and the battery interface module is respectively connected with the interface J10 and the interface J11.
Compared with the prior art, the invention has the beneficial effects that: the double-row spring thimble connector is adopted, so that on one hand, the charging capacity can be increased, and on the other hand, more signal transmission can be compatible, and a realization basis is provided for abundant expansion functions of the base; the method comprises the steps of (1) converting a keyboard base passive device into active device, and converting single-direction insertion into positive and negative double-direction insertion; support through the base charging, reduced the consumption of dull and stereotyped after the access base.
Drawings
FIG. 1 is a block diagram of the structure of the present invention;
FIG. 2 is a schematic diagram of a flat panel interface circuit;
FIG. 3 is a schematic diagram of a flat-end patch panel circuit;
FIG. 4 is a schematic circuit diagram of a base pivot plate;
fig. 5 is a schematic diagram of a keyboard base end interface circuit.
Detailed Description
The invention will be described in further detail with reference to the drawings and examples.
As shown in fig. 1, the present invention includes a flat-end interface circuit, a flat-end adapter board circuit, a base-rotating-shaft board circuit, and a keyboard base-end interface circuit.
The function of the panel end interface circuit is to connect the USB signal of the main control end, the SMBUS (System management bus) signal of the battery, the detection signal and the input/output power supply signal to the panel end adapter plate. Wherein the USB signal is used for transmitting various USB equipment information of the base; the SMBUS signal is used for transmitting battery information of the keyboard base; the detection signal is used for identifying whether the base is inserted or not, and whether a 5V power supply can be provided for the keyboard base or not; a plurality of power PINs are used to input or output power.
The flat-end adapter board circuit has the function of transferring various signals of the flat end to a double-row POGO PIN (spring thimble connector) through a special flat cable. In order to realize the identification of the forward insertion or the reverse insertion, the symmetrical principle is skillfully utilized in the design of the POGO PIN (spring PIN connector), and each group of signals are respectively and symmetrically connected to each PIN of the POGO PIN (spring PIN connector).
The base adapter plate circuit has the function of receiving all groups of signals at the flat plate end through the physical contact between the double-row POGO PIN of the flat plate end adapter plate and the double-row POGO PIN (spring thimble connector) of the keyboard base. Positive and negative identification is performed according to the polarity signal, and in order to ensure the integrity of the USB signal, an analog switch is used to minimize the branching end of the USB signal. And then rearrange the signals into unidirectional signals for transmission to the keyboard base.
The keyboard base end interface circuit has the function of converting various signals transferred by the base rotating shaft plate into different expansion ports through each conversion module, so that various expansion functions of the base are realized.
As shown in fig. 2, the flat-end signal mainly includes: USB signals, SMBUS signals, battery detection signals, cradle insertion detection signals, LED signals, and three Power signals. The flat-panel interface circuit comprises a connector J1, a power supply module and a communication module which is respectively connected with the flat-panel main control and the connector J1.
Each PIN definition of the connector is identified in the D frame, the interface of the connector J1 comprises 20 PINs, wherein the 14 th PIN and the 15 th PIN are defined as USB signal PINs and are used for transmitting information of all keyboard base USB devices; pins 8 and 9 are defined as system management bus signal pins of the battery; the 11 th pin is defined as a battery detection signal pin and is used for reporting the insertion or extraction state of a battery at the base end of the keyboard; the 20 th pin is defined as a base detection signal pin and is used for reporting whether the keyboard base is connected with the flat plate end or not; the 12 th pin is defined as an LED signal pin and is used for indicating the charging and discharging states of the battery of the keyboard base; the power signals are divided into three groups: pins 1 and 2 are defined as VCC_AC pins for the cradle to charge the tablet; pins 6 and 7 are defined as VC_BAT2 pins for the base battery to supply power to the tablet terminal; the 16 th pin is defined as a VDOCK_5V pin and is used for supplying power to the base peripheral equipment by the panel end; pins 3, 4, 5, 10, 13, and 17 are defined as GND pins, which provide a return path for each group of signals, and the upper and lower ends of the connector J1, i.e., pins 21 and 22, are grounded.
The power supply module supporting the external power supply of the keyboard base is identified in the B frame, the power supply module comprises a switch tube Q3 and a power chip U1, wherein the G pole of the switch tube Q3 is connected with the 20 th pin of the connector J1, the S pole of the switch tube Q3 is grounded, the D pole of the switch tube Q3 is connected with the enabling end of the pin 6 of the power chip U1, the pin 2 of the power chip U1 is a power input end, and the pin 3 of the power chip U1 is an output end.
When the base detection signal detects that the base is inserted, the circuit is started to supply power to the base. When the keyboard base is inserted, the level of KBDOCK_INJ is changed from H to L, so that the switching tube Q3 is turned off, and the level of the EN pin of the power chip U1 is pulled high. Thus, the power chip U1 starts to operate, and finally VDOCK_5V is supplied to the base to supply power.
The communication interface between each data signal and the CPU of the panel master control is marked in the C frame, the switch module supporting the Windows continuous function is marked in the A frame, the switch module is respectively connected with the DOCK_DET pin of the panel master control and the connector J1, the switch module comprises a switch tube Q1, the G electrode of the switch tube Q1 is connected with the pin 20 of the connector J1, the D electrode of the switch tube Q1 is connected with the DOCK_DET pin of the panel master control, and the S electrode of the switch tube Q1 is grounded.
As shown in fig. 3, the flat-end patch board circuit includes an interface J4 and double-row POGO PIN connectors J2 and J3, which are connected to each other, wherein the interface J4 is matched with an interface PIN of the connector J1, and is used for connecting with the connector J1 to connect a flat-end signal to the double-row POGO PIN. In order to be compatible with the forward and reverse plug design, the pin definitions of the interface J2 and the interface J3 of the double-row spring thimble connector are symmetrically processed. Thus, when the flat board is inserted into the keyboard base, all signals can be seamlessly connected.
Specifically, pins B14, B9, B6 of the interface J2 and pins a14, A9, A6 of the interface J3 are grounded pins, pins B13 of the interface J2 and pin a13 of the interface J3 are connected with pin 12 of the interface J4, pins B12 of the interface J2 and pin a12 of the interface J3 are connected with pin 11 of the interface J4, pins B11 of the interface J2 and pin a11 of the interface J3 are defined as vcc_ac pins, pins B10 of the interface J2 and pin a10 of the interface J3 are connected with pin 20 of the interface J4, interfaces B8, B7, B1 of the interface J2 are idle, interfaces A8, A7 of the interface J3 are connected with pins 14 and 15 of the interface J4, the interface A1 of the interface J3 is grounded through a resistor, pins B4 of the interface J2 and pin A5 of the interface J3 are defined as vcc_bat2, pins B4 of the interface J2 and pin A4 of the interface J3 are defined as vcc_v 5 of the interface J3 and pin A2, and pins B2 of the interface J2 and pin A4 of the interface J2 are connected with pins B3 and pin B2 of the interface J2.
As shown in fig. 4, the base rotating shaft board circuit includes double-row spring thimble connectors J5 and J6, a power signal interface J7, other signal interfaces J8 and an analog switch module, where the double-row spring thimble connectors J5 and J6 are connected with the double-row spring thimble connectors J2 and J3, the power signal interface J7 is connected with the double-row spring thimble connectors J5 and J6 power pins, and pins 6 and 7 of the other signal interfaces J8 are connected with pins B7 and B8 of the interface J5 of the double-row spring thimble connectors and pins A7 and A8 of the interface J6 through the analog switch module, and other signal pins of the double-row spring thimble connectors J5 and J6 are connected with other signal interfaces J8.
The definitions of the double-row spring thimble connectors J5 and J6 and the double-row spring thimble connectors J2 and J3 are almost identical, and the difference is that: the PINs B10 and A10 of the double-row spring thimble connectors J5 and J6 are connected with a pull-down resistor, so as to indicate the corresponding PIN of the flat adapter plate, and the base is connected; b7, B8, A7 and A8 pins are defined as USB signal pins, and the purpose is to be compatible with the forward and backward insertion of high-speed signals; the A1 pin is defined as a polarity detection signal pin; the analog switch module comprises an analog switch U2 and a switch tube Q5, wherein the G pole of the switch tube Q5 is connected with an A1 pin, the D pole of the switch tube Q5 is respectively connected with a power supply and a10 th pin of the analog switch, the S pole of the switch tube Q5 is grounded, input pins 4, 5, 6 and 7 of the analog switch U2 are respectively connected with double-row spring thimble connectors J5 and J6, and output pins 1 and 2 of the analog switch U2 are connected with an interface J8. If the flat plate faces the user and inserts into the keyboard base, the 10 th pin of the analog switch is pulled down, and meanwhile, D+ and D-signals of the analog switch are connected to the HSD2 to finish switching of USB signals; if the flat board is opposite to the user and goes into and out of the keyboard base, the 10 th pin of the analog switch is pulled up, and meanwhile, the D+ and D-signals of the analog switch are connected to the HSD1, and the switching of the USB signals is completed.
The interface J7 and the interface J8 together define a signal interface for transmitting the PIN signal of the POGO PIN on the spindle to the keyboard base end again in a flat-line shape.
As shown in fig. 5, the keyboard base interface circuit includes an interface J10, an interface J11, a vcc_ac interface module, and a battery interface module, where the definition of the interface J10 is consistent with the definition of the interface J7, the definition of the interface J11 is consistent with the definition of the interface J8, the vcc_ac interface module is connected to the vcc_ac pin of the interface J10, and the battery interface module is connected to the interfaces J10 and J11, respectively.
The left half interfaces J10 and J11 are defined by the same definition as the base rotating shaft board circuits J7 and J8, and signals at the flat plate end can be smoothly connected into the base through the interface design of the base rotating shaft board. The accessed signals include: USB signal, SMBUS (System management bus) signal of battery and detection signal, is used for the LED signal of the charge-discharge state of the battery of the base. Power signals are divided into three groups: VCC_AC is used for charging the pad, VCC_BAT2 is used for powering the pad side by the pad battery, and VDOCK (pad) _5V is used for powering the pad side peripheral. The right half is the interface design of vcc_ac and the interface design of battery side, respectively.
The double-row spring thimble connector is adopted, so that on one hand, the charging capacity can be increased, and on the other hand, more signal transmission can be compatible, and a realization basis is provided for abundant expansion functions of the base; the method comprises the steps of (1) converting a keyboard base passive device into active device, and converting single-direction insertion into positive and negative double-direction insertion; support through the base charging, reduced the consumption of dull and stereotyped after the access base.
The technical scheme of the invention is particularly suitable for three-proofing intelligent equipment which needs to work for a long time under severe working environments, and provides a guarantee for convenient and rapid insertion into a base; can ensure that the flat plate can ensure the normal working state of the base no matter in the forward and reverse directions. The method has the advantages of simple control, few electronic elements, low price and the like.
The above embodiments are preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, which includes but is not limited to the embodiments, and equivalent modifications according to the present invention are within the scope of the present invention.

Claims (9)

1. An interface circuit for realizing forward and reverse insertion of a tablet device and a keyboard base is characterized in that: the system comprises a flat-plate end interface circuit, a flat-plate end adapter plate circuit, a base rotating shaft plate circuit and a keyboard base end interface circuit, wherein the flat-plate end interface circuit is used for connecting a USB signal of a main control end, a system management bus signal of a battery, a detection signal and an input/output power supply signal to the flat-plate end adapter plate; the flat-end adapter plate circuit is used for transferring various signals of the flat end to the double-row spring thimble connector through a special flat cable; the base rotating shaft plate circuit is in physical contact with the double-row spring thimble connector and receives all groups of signals on the flat-plate-end adapter plate; the keyboard base end interface circuit is used for converting various signals transferred by the base rotating shaft plate into different expansion ports through each conversion module,
the flat-plate-end adapter plate circuit and the base rotating shaft plate circuit are connected through a double-row spring thimble connector, and the base rotating shaft plate circuit receives all groups of signals on the flat-plate-end adapter plate and performs positive and negative identification according to the polarity detection signals;
the flat-plate-end adapter plate circuit comprises double-row spring thimble connectors J2 and J3, wherein the interface J2 of the double-row spring thimble connectors J2 and J3 and the pin definition of the interface J3 are symmetrically processed;
the B14, B9 and B6 pins of the interface J2 and the A14, A9 and A6 pins of the interface J3 are grounded pins, the B13 and A13 pins of the interface J2 and the A13 pin of the interface J3 are connected with the pin 12 of the interface J4, the B12 and A12 pins of the interface J2 and the A12 pin of the interface J3 are connected with the pin 11 of the interface J4, the B11 and A11 pins of the interface J2 and the A11 pin of the interface J3 are defined as VCC_AC pins, the B10 and A10 pins of the interface J2 and the A10 pin of the interface J3 are connected with the pin 20 of the interface J4, the B8, B7 and B1 interfaces of the interface J2 are idle, the A8 and A7 interfaces of the interface J3 are respectively connected with the 14 pin and the 15 pin of the interface J4, the A1 interface of the interface J3 is grounded through a resistor, the B5 and A5 pins of the interface J2 are defined as VCC_BAT2 pin, the B4 and A4 pin of the interface J2 are defined as VCC_ACpin, the B4 and the A4 pin of the interface J3 is connected with the pin 20 of the interface J2 and the B8 pin of the interface J2 and the interface 3 is connected with the pin 3 and the pin 3;
the base rotating shaft plate circuit comprises double-row spring thimble connectors J5 and J6 and an analog switch module, wherein the double-row spring thimble connectors J5 and J6 are connected with the double-row spring thimble connectors J2 and J3,
the definition of the double-row spring thimble connectors J5 and J6 is different from that of the double-row spring thimble connectors J2 and J3 only in that: the double-row spring thimble connectors J5 and J6 comprise an interface J5 and an interface J6, wherein the interface J5 comprises B1-B14 pins, the interface J6 comprises A1-A14 pins, the B10 pin of the interface J5 and the A10 pin of the interface J6 are connected with a pull-down resistor, the B7 pin and the B8 pin of the interface J5 and the A7 pin and the A8 pin of the interface J6 are all defined as USB signal pins, and the A1 pin of the interface J5 is defined as a polarity detection signal pin; the analog switch module comprises a switch tube Q5, and the G pole of the switch tube Q5 is connected with the A1 pin of the interface J6.
2. The interface circuit of claim 1, wherein: the flat-panel interface circuit comprises a connector J1, a power supply module and a communication module which is respectively connected with the flat-panel main control and the connector J1.
3. The interface circuit of claim 2, wherein: the interface of the connector J1 comprises 20 pins, wherein the 14 th pin and the 15 th pin are defined as USB signal pins and are used for transmitting information of all keyboard base USB devices; pins 8 and 9 are defined as system management bus signal pins of the battery; the 11 th pin is defined as a battery detection signal pin and is used for reporting the insertion or extraction state of a battery at the base end of the keyboard; the 20 th pin is defined as a base detection signal pin and is used for reporting whether the keyboard base is connected with the flat plate end or not; the 12 th pin is defined as an LED signal pin and is used for indicating the charging and discharging states of the battery of the keyboard base; the power signals are divided into three groups: pins 1 and 2 are defined as VCC_AC pins for the cradle to charge the tablet; pins 6 and 7 are defined as VC_BAT2 pins for the base battery to supply power to the tablet terminal; the 16 th pin is defined as a VDOCK_5V pin and is used for supplying power to the base peripheral equipment by the panel end; pins 3, 4, 5, 10, 13, 17 are defined as GND pins, providing a return path for each set of signals and power.
4. An interface circuit as claimed in claim 3, wherein: the power supply module comprises a switch tube Q3 and a power chip U1, wherein the G pole of the switch tube Q3 is connected with the 20 th pin of the connector J1, the S pole of the switch tube Q3 is grounded, the D pole of the switch tube Q3 is connected with the enabling end of the pin 6 of the power chip U1, the pin 2 of the power chip U1 is a power input end, and the pin 3 of the power chip U1 is an output end.
5. An interface circuit as claimed in claim 3, wherein: the switch module is respectively connected with the DOCK_DET pin of the panel master control and the connector J1, the switch module comprises a switch tube Q1, the G electrode of the switch tube Q1 is connected with the pin 20 of the connector J1, the D electrode of the switch tube Q1 is connected with the DOCK_DET pin of the panel master control, and the S electrode of the switch tube Q1 is grounded.
6. An interface circuit according to any of claims 2-5, characterized in that: the flat-end adapter plate circuit further comprises an interface J4 connected with the double-row spring thimble connectors J2 and J3, and the interface J4 is matched with an interface pin of the connector J1 and is used for being connected with the connector J1.
7. An interface circuit according to any one of claims 1-5, wherein: the base rotating shaft board circuit further comprises a power signal interface J7 and other signal interfaces J8, wherein the power signal interface J7 is connected with power pins of the double-row spring thimble connectors J5 and J6, pins 6 and 7 of the other signal interfaces J8 are connected with B7 and B8 pins of the interfaces J5 of the double-row spring thimble connectors J5 and J6 and A7 and A8 pins of the interfaces J6 through analog switch modules, and other signal pins of the double-row spring thimble connectors J5 and J6 are connected with the other signal interfaces J8.
8. The interface circuit of claim 7, wherein: the analog switch module further comprises an analog switch U2, the D pole of the switch tube Q5 is respectively connected with a power supply and the 10 th pin of the analog switch U2, the S pole of the switch tube Q5 is grounded, the pins 4, 5, 6 and 7 of the analog switch U2 are input pins, the pins 1 and 2 of the analog switch U2 are output pins, the pins 4, 5, 6 and 7 of the analog switch U2 are respectively connected with double-row spring thimble connectors J5 and J6, and the pins 1 and 2 of the analog switch U2 are respectively connected with other signal interfaces J8.
9. The interface circuit of claim 7, wherein: the keyboard base interface circuit comprises an interface J10, an interface J11, a VCC-AC interface module and a battery interface module, wherein the definition of the interface J10 is consistent with that of a power signal interface J7, the definition of the interface J11 is consistent with that of other signal interfaces J8, the VCC-AC interface module is connected with a VCC-AC pin of the interface J10, and the battery interface module is respectively connected with the interface J10 and the interface J11.
CN201710538657.7A 2017-07-04 2017-07-04 Interface circuit for realizing forward and reverse insertion of tablet equipment and keyboard base Active CN107329918B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204789815U (en) * 2015-07-14 2015-11-18 珠海市运泰利自动化设备有限公司 Many pogopin module test clamp plate
CN105242757A (en) * 2015-11-09 2016-01-13 合肥宝龙达光电技术有限公司 Connection structure of tablet personal computer and base
CN207008606U (en) * 2017-07-04 2018-02-13 深圳市亿道信息股份有限公司 A kind of interface circuit for realizing positive anti-plug with keyboard base for tablet device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN204789815U (en) * 2015-07-14 2015-11-18 珠海市运泰利自动化设备有限公司 Many pogopin module test clamp plate
CN105242757A (en) * 2015-11-09 2016-01-13 合肥宝龙达光电技术有限公司 Connection structure of tablet personal computer and base
CN207008606U (en) * 2017-07-04 2018-02-13 深圳市亿道信息股份有限公司 A kind of interface circuit for realizing positive anti-plug with keyboard base for tablet device

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