WO2014106444A1 - 电子设备的智能卡连接电路以及电子设备 - Google Patents

电子设备的智能卡连接电路以及电子设备 Download PDF

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Publication number
WO2014106444A1
WO2014106444A1 PCT/CN2013/090804 CN2013090804W WO2014106444A1 WO 2014106444 A1 WO2014106444 A1 WO 2014106444A1 CN 2013090804 W CN2013090804 W CN 2013090804W WO 2014106444 A1 WO2014106444 A1 WO 2014106444A1
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WO
WIPO (PCT)
Prior art keywords
smart card
card
travel switch
switching unit
connection circuit
Prior art date
Application number
PCT/CN2013/090804
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English (en)
French (fr)
Inventor
唐科狄
胡林
彭忠辉
Original Assignee
华为终端有限公司
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 华为终端有限公司 filed Critical 华为终端有限公司
Priority to EP13870356.6A priority Critical patent/EP2852130B1/en
Priority to JP2015521973A priority patent/JP6158923B2/ja
Publication of WO2014106444A1 publication Critical patent/WO2014106444A1/zh
Priority to US14/566,884 priority patent/US9755373B2/en

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01RELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/66Structural association with built-in electrical component
    • H01R13/70Structural association with built-in electrical component with built-in switch
    • H01R13/703Structural association with built-in electrical component with built-in switch operated by engagement or disengagement of coupling parts, e.g. dual-continuity coupling part
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06FELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38Information transfer, e.g. on bus
    • G06F13/40Bus structure
    • G06F13/4063Device-to-bus coupling
    • G06F13/4068Electrical coupling
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06KGRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0013Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers
    • G06K7/0056Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers housing of the card connector
    • G06K7/0069Methods or arrangements for sensing record carriers, e.g. for reading patterns by galvanic contacts, e.g. card connectors for ISO-7816 compliant smart cards or memory cards, e.g. SD card readers housing of the card connector including means for detecting correct insertion of the card, e.g. end detection switches notifying that the card has been inserted completely and correctly

Definitions

  • the present invention relates to the field of electronic information technology, and in particular, to a smart card connection circuit of an electronic device and an electronic device provided with the smart card connection circuit.
  • SIM Subscriber Identity Module
  • the SIM card has contacts for connecting the power line, the ground line, and the respective signal lines.
  • the contacts are electrically connected to the corresponding pins on the card holder, and further through the card holder. Connect to your phone's modem (MODEM).
  • the normal power-off sequence of each contact in the SIM card is that each signal line is powered off first, and the power line is powered off.
  • the SIM card may be inserted or removed when the mobile phone is not turned off; or the SIM card is detached from the card holder when the mobile phone accidentally falls, so that the SIM card is not powered off in the normal order, resulting in the SIM card. Burned out.
  • the SIM card is also detached from the card holder, causing the SIM card to be burned out. Therefore, there is a technical problem in the prior art that the SIM card is easily burned out when it is detached from the deck.
  • Embodiments of the present invention provide a smart card connection circuit of an electronic device and an electronic device provided with the smart card connection circuit, which solves the technical problem that the SIM card is easily burned out when it is detached from the card holder in the prior art.
  • the present invention provides a smart card connection circuit for an electronic device, including a card holder, a trip switch, and a switching unit;
  • the power line pins and the respective signal line pins on the card holder are connected to respective corresponding interfaces of the input end of the switching unit;
  • a contact of the travel switch is located in the card holder, and an output end of the travel switch is connected to a control end of the switching unit;
  • the travel switch controls the switching unit to switch to the second output end
  • the signal line pins on the card holder are first grounded through the switching unit, and the power line pins on the card holder are grounded through the switching unit.
  • the smart card touches a contact of the travel switch, and the travel switch controls the switching unit to switch to the first
  • the power line pins and the respective signal line pins on the card holder are connected to the modem (MODEM) of the electronic device through the switching unit.
  • MODEM modem
  • a first resistor is connected in series between each signal line pin and the ground line on the card seat.
  • a second resistor is connected in series between the power line pin and the ground line on the card holder, and the resistance of the first resistor is smaller than the second resistor.
  • the output of the trip switch is also coupled to the GPI0 interface of the modem.
  • the output of the trip switch is also connected to the GPI0 interface of the application processor of the electronic device.
  • the output of the trip switch is connected to the GPI0 interface of the modem and the GPI0 interface of the application processor through an inverter.
  • the output end is connected to a high level by a pull-up resistor, and the output end Also grounded through the contact;
  • the stroke switch When the contact is closed, the stroke switch outputs a low level.
  • the output end of the travel switch is connected with a filtering unit.
  • the switching unit is a logic circuit, and each pin on the card is connected to the switching unit.
  • the smart card is a Subscriber Identity Module (SIM) card.
  • the present invention provides an electronic device comprising the smart card connection circuit of any one of the above embodiments.
  • the electronic device is a mobile phone or a tablet.
  • the above technical solution provided by the present invention has the following advantages: Under normal circumstances, the smart card is located at a preset position of the card seat, touches the contact of the travel switch, and the travel switch control switching unit switches to the first At the output, each contact on the smart card is connected to the M0DEM through the corresponding pin on the deck and the switching unit.
  • the smart card When the smart card is pulled out of the deck when the electronic device is not turned off, or the smart card is detached from the deck due to various reasons such as dropping, the smart card will first leave the preset position in the deck, and the various contacts of the smart card are also The corresponding pins on the deck remain electrically connected. At this time, the contact of the travel switch has returned to the original position, and the travel switch control switching unit is switched to the second output end, and the contact of each signal line on the smart card is first grounded through the card holder and the switching unit, and then the power supply on the smart card The contact of the wire is grounded through the card holder and the switching unit.
  • the various contacts of the smart card can be powered off in a normal order, thereby preventing the smart card from being burned out when the card is detached from the card seat, thereby solving the technical problem that the SIM card is easily burned out when the card is detached from the card holder in the prior art.
  • FIG. 1 is a schematic diagram of a smart card connection circuit according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic diagram of a smart card connection circuit according to Embodiment 2 of the present invention.
  • FIG. 3 is another schematic diagram of a smart card connection circuit according to Embodiment 2 of the present invention.
  • Embodiment 4 is a schematic diagram of an electronic device provided in Embodiment 3 of the present invention.
  • the smart card connection circuit of the electronic device can be applied to an electronic device such as a mobile phone or a tablet computer.
  • This embodiment uses an SM card in a mobile phone as an example for description.
  • the SM card connection circuit includes a card holder, a travel switch, and a switching unit.
  • the switching unit is equivalent to four synchronous single-pole double-throw switches.
  • the right side is the input end and the left side is the two output ends.
  • the first output end is the modem of the mobile phone (MODEM), and the second output end is the grounding end.
  • MODEM modem of the mobile phone
  • the power line pin VSM and each signal line pin (including the reset signal line pin RST, the clock signal line pin CLK, and the data line pin DAT) on the deck are connected to respective corresponding interfaces of the input end of the switching unit;
  • the contact is located in the deck, and the output of the travel switch is connected to the control terminal SEL of the switching unit.
  • the SIM card touches the contact of the travel switch, and the travel switch control switching unit switches to the first output end 1VS top, 1RST, 1CLK, 1DAT, the power line on the deck
  • the pin and each signal line pin are connected to the M0DEM of the mobile phone through the switching unit.
  • each signal line pin on the deck is grounded first through the switching unit, and the power line pin on the card holder is grounded through the switching unit.
  • the SM card is located at the preset position of the card seat, touches the contact of the travel switch, and the travel switch control switching unit is switched to the first output end, and the respective contacts on the SM card pass through the corresponding pins on the card holder. And the switching unit is connected to the M0DEM.
  • the SIM card When the SIM card is pulled out of the deck when the mobile phone is not turned off, or the SIM card is removed from the deck due to various reasons such as dropping, the SIM card will first leave the preset position in the deck, and each touch of the SM card The chip also maintains an electrical connection with the corresponding pins on the deck. At this time, the contact of the travel switch has returned to the original position, and the travel switch control switching unit is switched to the second output end, and the contact of each signal line on the SM card is first grounded through the card holder and the switching unit, and then on the SM card. The contacts of the power cord are grounded through the card holder and the switching unit.
  • the various contacts of the SIM card can be powered off in a normal order, thereby preventing the SIM card from being burnt out when it is detached from the card holder, thereby solving the problem that the SIM card in the prior art is easily burned out when it is detached from the card holder. technical problem.
  • the preset position in the deck can be set to a certain range as long as the SM card is in this range.
  • the contact of the travel switch can be touched within the circumference. This can make the SIM card have a certain normal loose range, so that the contact of the travel switch is not too sensitive, and the SIM card is powered off when it is slightly loose.
  • the switching unit is a logic circuit, and the VS top, RST, CLK, and DAT pins on the deck are connected to respective corresponding pins of the input end of the switching unit.
  • a first resistor R1 is connected in series between each signal line pin 2RST, 2CLK, 2DAT and the ground line
  • a second resistor R2 is connected in series between the power line pin 2VSIM and the ground line, and R1
  • the resistance is less than R2.
  • the resistance of R1 and R2 can be selected between 1-10, and the resistance of R2 is 3 to 5 times that of R1.
  • R1 and R2 can also be replaced with other components such as capacitors, delays, etc., and adjusted to appropriate parameters to achieve 2RST, 2CLK, 2DAT grounding prior to 2VSM.
  • the switches of 2RST, 2CLK, 2DAT and 2VSM can be independently controlled to realize 2RST, 2CLK, 2DAT grounding first, and 2VSM after grounding.
  • the input terminal, the first output terminal and the second output terminal in the embodiment of the present invention can transmit signals bidirectionally, and do not limit the specific transmission direction of the signal.
  • the output end of the travel switch is also connected to the MODEM General Purpose Input Output (GPIO) interface, so that the MODEM can determine the SM. Whether the card is in place (preset position of the deck).
  • GPIO General Purpose Input Output
  • the output of the trip switch is also connected to the GPI0 interface of the application processor (AP) of the mobile phone, so that the AP can determine whether the SIM card is in place.
  • AP application processor
  • the correct sequence for powering up the SM card is that the power line VSM is powered up first, and each signal line CLK, RST, and DAT is powered up.
  • the SM card touches the contact of the travel switch, and the AP of the mobile phone can detect that the SM card is already in place through the GPI0 interface, so the AP can control the power line of the SM card. Power on first, and then power up after each signal line, so that the SM card starts to work normally.
  • the smart card connection circuit provided in this embodiment not only has the hot-draw card in the first embodiment, but also enables the hot-plug card, that is, the smart card connection circuit in this embodiment can implement hot plugging of the SIM card, so that the SIM card is The plugging and unplugging is safer, more convenient and faster.
  • the output terminal is connected to the high level through the pull-up resistor R, and the output terminal is also grounded through the contact P.
  • the initial state of the contact P is closed, the output end of the travel switch is grounded, and the output is low;
  • the SIM card is in position, the SM card touches the contact P, so that the contact P Disconnected, the stroke switch outputs a high level.
  • the output end of the travel switch is also connected with a filtering unit for preventing signal jitter of the output of the travel switch when the SIM card is inserted and removed.
  • the filtering unit uses an RC filter, which is composed of a filter resistor R0 and a filter capacitor CO. In other embodiments, any other filter unit may be used.
  • the switching unit in this embodiment is FSA2567, and the FSA2567 can meet the requirements of the SM card communication rate, and the bidirectional signals between the input end and the output end are not distorted.
  • the output of the trip switch is connected to the select pin SEL (control terminal) of the FSA2567.
  • SEL select pin
  • the input of the FSA2567 is connected to the first output; when the SEL is low, the input and the second output of the FSA2567. Connected to the end.
  • an output of the trip switch is provided with an inverter, and is connected to the GPI0 interface of the MODEM and the GPI0 interface of the AP through the inverter.
  • the inverter has two input/outputs, and the output end of the stroke switch is divided into two paths respectively connected to two input terminals of the inverter, and two outputs of the inverter are respectively connected to the MODEM.
  • the GPI0 interface of the AP This separates the signals input to the MODEM and the AP.
  • the working state and level of each device in the SIM card connection circuit provided by this embodiment are related to whether the SIM card is in place, wherein 0 represents a low level and 1 represents a high level:
  • the logic control signals of the smart card connection circuit are not limited to the implementations listed in the above table.
  • the setting of the travel switch can be changed to output a low level when the SIM card is in position, and a high level when the SIM card is not in position. Then connecting the first output end of the switching unit to the second output end The mode is interchanged, that is, the first output end is connected to the ground line, and the second output end is connected to the MODEM, and the technical effect of preventing the SIM card from being burned out when it is detached from the card seat can also be achieved.
  • the present invention provides an electronic device in which any one of the smart card connection circuits of the first embodiment and the second embodiment is provided.
  • the electronic device may specifically be a mobile phone (handset), and the smart card connection circuit is used to prevent the SIM card in the mobile phone from being burnt out when it is detached from the card holder.
  • the card holder in the mobile phone is used to install the SM card, and the respective contacts on the SM card are connected to the switching unit through the card holder, and further connected to the MODEM through the first output end of the switching unit.
  • the travel switch control switching unit is switched to the second output end, and the respective signal line pins on the deck are first grounded through the switching unit, and the power line pins on the card holder are By switching the unit to ground, it is avoided that the SIM card is burned out when it is detached from the deck.
  • the mobile phone further includes an AP.
  • the AP can detect that the SM card is in place through the GPI0 interface.
  • the AP can control the power cable of the SM card to power on first, and then power on each signal line, so that the SIM card starts to work normally. . Therefore, the electronic device provided by the embodiment of the invention implements hot plugging of the smart card.
  • the electronic device can also be a tablet.
  • the SIM card is inserted into the tablet, and the SIM card can be used for network connection. Therefore, the smart card connection circuit can also be used in the tablet to prevent the SM card from being burnt out when the card is detached from the card holder. .
  • the electronic device provided by the embodiment of the present invention has the same technical features as the smart card connection circuit provided by the above embodiment, the same technical effect can be produced and the same technical problem can be solved.

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Abstract

一种电子设备的智能卡连接电路以及电子设备,属于电子信息技术领域。解决了现有技术中SIM卡很容易在脱离卡座时被烧坏的技术问题。该智能卡连接电路包括卡座、行程开关和切换单元;卡座上的电源线引脚和各个信号线引脚连接至切换单元的输入端的各个相应接口;行程开关的触点位于卡座中,行程开关的输出端与切换单元的控制端相连;当卡座中预设位置上的智能卡离开该预设位置时,智能卡离开行程开关的触点,行程开关控制切换单元切换至第二输出端,卡座上的各个信号线引脚先通过切换单元接地,卡座上的电源线引脚后通过切换单元接地。该智能卡连接电路应用于手机、平板电脑等电子设备。

Description

电子设备的智能卡连接电路以及电子设备 本申请要求于 2013年 01月 07日提交中国专利局、 申请号为 CN 201310005012. 9、 发明名称为 "电子设备的智能卡连接电路以及电子设备"的中国专利申请的优先权, 其 全部内容通过引用结合在本申请中。 技术领域 本发明属于电子信息技术领域, 具体涉及一种电子设备的智能卡连接电路以及设有 该智能卡连接电路的电子设备。
背景技术 随着电子技术的不断发展, 手机、 平板电脑等电子设备已经成为人们日常生活中常 见的通信工具。 以手机为例, 客户识别模块 (Subscriber Identity Module, SIM) 卡 是手机中的重要部件, 安装于手机内的卡座中。 SIM卡上设有用于连接电源线、 地线、 各个信号线的触片, SIM卡安装在卡座上时,这些触片就会与卡座上相应的引脚电连接, 并通过卡座进一步连接至手机的调制解调器 (MODEM)。
SIM卡中各个触片正常的下电顺序是, 各个信号线先下电, 电源线后下电。 但是, 在用户使用过程中, 可能会在手机未关机的情况下插拔 SIM卡; 或者在手机意外跌落时 使 SIM卡脱离卡座,很容易使 SIM卡没有按照正常顺序下电,导致 SIM卡被烧坏。另外, 在手机的研发过程中, 特别是在手机跌落实验的过程中, 也会使 SIM卡脱离卡座, 导致 SIM卡被烧坏。 因此, 现有技术中存在 SIM卡很容易在脱离卡座时被烧坏的技术问题。
发明内容 本发明实施例提供了一种电子设备的智能卡连接电路以及设有该智能卡连接电路 的电子设备, 解决了现有技术中 SIM卡很容易在脱离卡座时被烧坏的技术问题。
为达到上述目的, 本发明的实施例采用如下技术方案:
一方面, 本发明提供了一种电子设备的智能卡连接电路, 包括卡座、 行程开关和切 换单元; 所述卡座上的电源线引脚和各个信号线引脚连接至所述切换单元的输入端的各个 相应接口;
所述行程开关的触点位于所述卡座中, 所述行程开关的输出端与所述切换单元的控 制端相连;
当所述卡座中的预设位置上的智能卡离开该预设位置时, 所述智能卡离开所述行程 开关的触点, 所述行程开关控制所述切换单元切换至第二输出端, 所述卡座上的各个信 号线引脚先通过所述切换单元接地, 所述卡座上的电源线引脚后通过所述切换单元接 地。
在第一种可能的实现方式中, 当所述卡座中的预设位置上有智能卡时, 所述智能卡 触动所述行程开关的触点, 所述行程开关控制所述切换单元切换至第一输出端, 所述卡 座上的电源线引脚和各个信号线引脚通过所述切换单元连接至所述电子设备的调制解 调器 (MODEM)。
结合第一种可能的实现方式, 在第二种可能的实现方式中, 在所述第二输出端, 所 述卡座上的各个信号线引脚与地线之间串联有第一电阻,所述卡座上的电源线引脚与地 线之间串联有第二电阻, 且所述第一电阻的阻值小于所述第二电阻。
结合第一种或第二种可能的实现方式, 在第三种可能的实现方式中, 所述行程开关 的输出端还与所述调制解调器的 GPI0接口相连。
结合第三种可能的实现方式, 在第四种可能的实现方式中, 所述行程开关的输出端 还与所述电子设备的应用处理器的 GPI0接口相连。
结合第四种可能的实现方式, 在第五种可能的实现方式中, 所述行程开关的输出端 通过反相器与所述调制解调器的 GPI0接口及所述应用处理器的 GPI0接口相连。
结合第一种至第五种任意一种可能的实现方式, 在第六种可能的实现方式中, 在所 述行程开关中, 所述输出端通过上拉电阻连接至高电平, 所述输出端还通过所述触点接 地;
所述触点断开时, 所述行程开关输出高电平;
所述触点闭合时, 所述行程开关输出低电平。
结合第六种可能的实现方式, 在第七种可能的实现方式中, 所述行程开关的输出端 连接有滤波单元。
结合第一种至第七种任意一种可能的实现方式, 在第八种可能的实现方式中, 所述 切换单元为逻辑电路,所述卡座上的各个引脚连接至所述切换单元的输入端的各个相应 结合第一种至第八种任意一种可能的实现方式, 在第九种可能的实现方式中, 所述 智能卡为客户识别模块 ( Subscriber Identity Module, SIM) 卡。
另一方面, 本发明还提供了一种电子设备, 其中包括上述任意一种实现方式所述的 智能卡连接电路。
在第一种可能的实现方式中, 所述电子设备为移动电话或平板电脑 (pad)。
与现有技术相比, 本发明所提供的上述技术方案具有如下优点: 在正常情况下, 智 能卡位于卡座的预设位置上, 触动行程开关的触点, 行程开关控制切换单元切换至第一 输出端, 智能卡上的各个触片通过卡座上相应的引脚以及切换单元连接至 M0DEM。
当智能卡在电子设备未关机的情况下被拔出卡座, 或者因为跌落等各种原因使智能 卡脱离卡座时, 智能卡会先离开卡座中的预设位置, 而智能卡的各个触片还与卡座上相 应的引脚保持着电连接。 此时, 行程开关的触点已经回到原位, 行程开关控制切换单元 切换至第二输出端, 智能卡上的各个信号线的触片会先通过卡座以及切换单元接地, 然 后智能卡上的电源线的触片才通过卡座以及切换单元接地。这样就能够使智能卡的各个 触片按照正常的顺序下电, 从而避免了智能卡在脱离卡座时被烧坏, 解决了现有技术中 SIM卡很容易在脱离卡座时被烧坏的技术问题。
附图说明 为了更清楚地说明本发明实施例中的技术方案, 下面将对实施例描述中所需要使用 的附图作简单地介绍, 显而易见地, 下面描述中的附图仅仅是本发明的一些实施例, 对 于本领域普通技术人员来讲, 在不付出创造性劳动的前提下, 还可以根据这些附图获得 其他的附图。
图 1为本发明的实施例 1所提供的智能卡连接电路的示意图;
图 2为本发明的实施例 2所提供的智能卡连接电路的示意图;
图 3为本发明的实施例 2所提供的智能卡连接电路的另一示意图;
图 4为本发明的实施例 3所提供的电子设备的示意图。
具体实施方式 下面将结合本发明实施例中的附图, 对本发明实施例中的技术方案进行清楚、 完整 地描述, 显然, 所描述的实施例仅仅是本发明一部分实施例, 而不是全部的实施例。 基 于本发明中的实施例,本领域普通技术人员在没有付出创造性劳动的前提下所获得的所 有其他实施例, 都属于本发明保护的范围。
实施例 1 :
如图 1所示, 本发明实施例所提供的电子设备的智能卡连接电路可应用于手机、 平 板电脑 (pad) 等电子设备中, 本实施例以手机中的 SM卡为例进行说明。 该 SM卡连接 电路包括卡座、 行程开关和切换单元。 切换单元相当于四个同步的单刀双掷开关, 右侧 为输入端, 左侧为两个输出端, 其中第一输出端为手机的调制解调器(MODEM), 第二输 出端为接地端。
卡座上的电源线引脚 VSM和各个信号线引脚 (包括复位信号线引脚 RST、 时钟信号 线引脚 CLK、 数据线引脚 DAT)连接至切换单元的输入端的各个相应接口; 行程开关的触 点位于卡座中, 行程开关的输出端与切换单元的控制端 SEL相连。
当卡座中的预设位置上有 SM卡时, SIM卡触动行程开关的触点, 行程开关控制切换 单元切换至第一输出端 1VS頂、 1RST、 1CLK、 1DAT, 卡座上的电源线引脚和各个信号线 引脚通过切换单元连接至手机的 M0DEM。
当卡座中的预设位置上的 SM卡离开该预设位置时, SM卡离开行程开关的触点, 使 行程开关的触点回到原位,行程开关控制切换单元切换至第二输出端 2VSIM、 2RST、 2CLK、 2DAT, 卡座上的各个信号线引脚先通过切换单元接地, 卡座上的电源线引脚后通过切换 单元接地。
在正常情况下, SM卡位于卡座的预设位置上, 触动行程开关的触点, 行程开关控 制切换单元切换至第一输出端, SM卡上的各个触片通过卡座上相应的引脚以及切换单 元连接至 M0DEM。
当 SIM卡在手机未关机的情况下被拔出卡座, 或者因为跌落等各种原因使 SIM卡脱离 卡座时, SIM卡会先离开卡座中的预设位置, 而 SM卡的各个触片还与卡座上相应的引脚 保持着电连接。 此时, 行程开关的触点已经回到原位, 行程开关控制切换单元切换至第 二输出端, SM卡上的各个信号线的触片会先通过卡座以及切换单元接地, 然后 SM卡上 的电源线的触片才通过卡座以及切换单元接地。 这样就能够使 SIM卡的各个触片按照正 常的顺序下电, 从而避免了 SIM卡在脱离卡座时被烧坏, 解决了现有技术中 SIM卡很容易 在脱离卡座时被烧坏的技术问题。
应当说明的是, 卡座中的预设位置可以设置成一定的范围, 只要 SM卡处于这一范 围之内能够触动行程开关的触点即可。 这样可以使 SIM卡具有一定的正常松动范围, 不 致于使行程开关的触点过于灵敏, 而导致 SIM卡稍有松动就下电。
本实施例中, 切换单元为逻辑电路, 卡座上的 VS頂、 RST、 CLK、 DAT引脚连接至切 换单元的输入端的各个相应引脚。 在切换单元的第二输出端, 各个信号线引脚 2RST、 2CLK、 2DAT与地线之间串联有第一电阻 Rl, 电源线引脚 2VSIM与地线之间串联有第二电 阻 R2, 且 R1的阻值小于 R2, 通常 R1和 R2的阻值可在 1-10 之间选取, 且 R2的阻值是 R1 的 3至 5倍。 这样, 当切换单元切换至第二输出端时, 在切换单元内部相当于四个单刀双 掷开关同时切换至第二输出端, 而在第二输出端与地线之间, 因为 R1的阻值小于 R2, 所 以能够实现各个信号线引脚 2RST、 2CLK、 2DAT比电源线引脚 2VSIM先接地, 使 SIM卡的各 个触片按照正确的顺序下电。
在其他实施方式中, 还可以将 R1和 R2换成电容、 延时器等其他元器件, 并调节至适 当参数, 以实现 2RST、 2CLK、 2DAT比 2VSM先接地。还可以在切换单元中,将 2RST、 2CLK、 2DAT与 2VSM 的开关分别独立控制, 以实现 2RST、 2CLK、 2DAT先接地, 2VSM后接地。
应当说明的是, 本发明实施例中的输入端、 第一输出端和第二输出端均可双向传输 信号, 并不限定信号的特定传输方向。
实施例 2:
如图 2和图 3所示, 本实施例在实施例 1的基础上, 行程开关的输出端还与 MODEM的通 用输入 /输出 (General Purpose Input Output, GPIO) 接口相连, 使 MODEM能够判断出 SM卡是否在位 (卡座的预设位置)。
进一步, 行程开关的输出端还与手机的应用处理器 (application processor, AP) 的 GPI0接口相连, 使 AP能够判断出 SIM卡是否在位。
另外, SM卡上电的正确顺序是电源线 VSM先上电, 各个信号线 CLK、 RST、 DAT后上 电。 当 SM卡被安装到卡座上, 处于预设位置时, SM卡触动行程开关的触点, 手机的 AP 可以通过 GPI0接口检测到 SM卡已经在位, 所以 AP就可以控制 SM卡的电源线先上电, 各 个信号线后上电, 使然后 SM卡开始正常工作。 因此, 本实施例中提供的智能卡连接电 路不仅具有实施例 1中的热拔卡, 还能够实现热插卡, 即本实施例中的智能卡连接电路 能够实现 SIM卡的热插拔, 使 SIM卡的插拔更为安全、 方便、 快捷。
如图 3所示, 本发明实施例中的行程开关中, 输出端通过上拉电阻 R连接至高电平, 同时输出端还通过触点 P接地。 卡座的预定位置上没有 SM卡时, 触点 P的初始状态为闭 合, 行程开关的输出端接地, 输出低电平; 当 SIM卡在位时, SM卡触动触点 P, 使触点 P 断开, 行程开关输出高电平。
作为一个优选方案, 行程开关的输出端还连接有滤波单元, 用于防止 SIM卡插拔时, 行程开关输出的信号抖动。 本实施例中, 滤波单元采用 RC滤波器, 由滤波电阻 R0和滤波 电容 CO组成, 在其他实施方式中也可以采用其他任意形式的滤波单元。
如图 3所示, 本实施例中的切换单元为 FSA2567, FSA2567能够满足 SM卡通信速率的 要求,并且输入端与输出端之间双向的信号都不失真。行程开关的输出端连接至 FSA2567 的选择引脚 SEL (控制端), 当 SEL为高电平时, FSA2567的输入端与第一输出端相连; SEL 为低电平时, FSA2567的输入端与第二输出端相连。
优选的, 如图 2所示, 行程开关的输出端设有一个反相器, 并通过该反相器与 MODEM 的 GPI0接口及 AP的 GPI0接口相连。 如图 2所示, 该反相器具有两路输入 /输出, 行程开关 的输出端分成两路分别连接至反相器的两个输入端, 反相器的两个输出端分别连接至 MODEM, AP的 GPI0接口。 这样可以将输入至 MODEM和 AP的信号隔开。 否则, 当 MODEM和 AP 的 GPI0接口均为高电平时, 如果 MODEM突然断电, GPI0接口变为低电平, 则 AP的 GPI0接 口的电平也会被拉低, 导致 AP对 SIM卡是否在位作出错误判断。 反之, AP突然断电也会 造成 MODEM对 SM卡是否在位作出错误的判断。
本实施例提供的 SIM卡连接电路中各个器件的工作状态及电平, 与 SIM卡是否在位的 关系如下表, 其中 0代表低电平, 1代表高电平:
Figure imgf000008_0001
应当说明的是,本发明提供的智能卡连接电路的逻辑控制信号并不限于上表中所列 的实现方式。 在其他实施方式中, 可以改变行程开关的设置, 使 SIM卡在位时输出低电 平, SIM卡不在位时输出高电平。 然后再将切换单元的第一输出端与第二输出端的连接 方式互换, 也就是将其第一输出端连接至地线, 第二输出端连接至 MODEM, 也可以达到 防止 SIM卡在脱离卡座时被烧坏的技术效果。
实施例 3:
如图 4所示, 另一方面, 本发明还提供了一种电子设备, 其中设置有上述实施例 1及 实施例 2中的任意一种智能卡连接电路。 该电子设备具体可以是移动电话 (手机), 利用 该智能卡连接电路来防止手机中的 SIM卡在脱离卡座时被烧坏。
如图 4所示, 手机中的卡座用于安装 SM卡, SM卡上的各个触片通过卡座连接至切 换单元, 进一步通过切换单元的第一输出端连接至 M0DEM。 当 SIM卡从卡座上的预设位置 离开时, 行程开关控制切换单元切换至第二输出端, 卡座上的各个信号线引脚先通过切 换单元接地, 卡座上的电源线引脚后通过切换单元接地, 从而避免 SIM卡在脱离卡座时 被烧坏。
本实施例中, 手机进一步还包括 AP。 当 SM卡安装在卡座中时, AP可以通过 GPI0接 口检测到 SM卡已经在位, AP就可以控制 SM卡的电源线先上电, 各个信号线后上电, 使 然后 SIM卡开始正常工作。 因此, 本发明实施例提供的电子设备实现了智能卡的热插拔。
该电子设备也可以是平板电脑 (pad), 平板电脑中插入 SIM卡, 可以利用 SIM卡进行 网络连接, 因此平板电脑中也可以利用该智能卡连接电路, 防止 SM卡在脱离卡座时被 烧坏。
由于本发明实施例提供的电子设备与上述实施例提供的智能卡连接电路具有相同 的技术特征, 所以也能产生相同的技术效果, 解决相同的技术问题。
以上所述, 仅为本发明的具体实施方式, 但本发明的保护范围并不局限于此, 任何 熟悉本技术领域的技术人员在本发明揭露的技术范围内, 可轻易想到的变化或替换, 都 应涵盖在本发明的保护范围之内。 因此, 本发明的保护范围应以权利要求的保护范围为 准。

Claims

权利要求
1、 一种电子设备的智能卡连接电路, 其特征在于: 包括卡座、 行程开关和切换单 元;
所述卡座上的电源线引脚和各个信号线引脚连接至所述切换单元的输入端的各个 相应接口;
所述行程开关的触点位于所述卡座中,所述行程开关的输出端与所述切换单元的控 制端相连;
当所述卡座中的预设位置上的智能卡离开该预设位置时,所述智能卡离开所述行程 开关的触点, 所述行程开关控制所述切换单元切换至第二输出端, 所述卡座上的各个信 号线引脚先通过所述切换单元接地, 所述卡座上的电源线引脚后通过所述切换单元接 地。
2、 根据权利要求 1所述的智能卡连接电路, 其特征在于: 当所述卡座中的预设位 置上有智能卡时, 所述智能卡触动所述行程开关的触点, 所述行程开关控制所述切换单 元切换至第一输出端,所述卡座上的电源线引脚和各个信号线引脚通过所述切换单元连 接至所述电子设备的调制解调器。
3、 根据权利要求 1所述的智能卡连接电路, 其特征在于: 在所述第二输出端, 所 述卡座上的各个信号线引脚与地线之间串联有第一电阻,所述卡座上的电源线引脚与地 线之间串联有第二电阻, 且所述第一电阻的阻值小于所述第二电阻。
4、 根据权利要求 1至 3任一项所述的智能卡连接电路, 其特征在于: 所述行程开 关的输出端还与所述调制解调器的通用输入 /输出 GPI0接口相连。
5、 根据权利要求 4所述的智能卡连接电路, 其特征在于: 所述行程开关的输出端 还与所述电子设备的应用处理器的 GPI0接口相连。
6、 根据权利要求 5所述的智能卡连接电路, 其特征在于: 所述行程开关的输出端 通过反相器与所述调制解调器的 GPI0接口及所述应用处理器的 GPI0接口相连。
7、 根据权利要求 1至 6任一项所述的智能卡连接电路, 其特征在于: 在所述行程 开关中, 所述输出端通过上拉电阻连接至高电平, 所述输出端还通过所述触点接地; 所述触点断开时, 所述行程开关输出高电平;
所述触点闭合时, 所述行程开关输出低电平。
8、 根据权利要求 7所述的智能卡连接电路, 其特征在于: 所述行程开关的输出端 连接有滤波单元。
9、 根据权利要求 1至 8任一项所述的智能卡连接电路, 其特征在于: 所述切换单 元为逻辑电路, 所述卡座上的各个引脚连接至所述切换单元的输入端的各个相应引脚。
10、 根据权利要求 1至 9任一项所述的智能卡连接电路, 其特征在于: 所述智能卡 为客户识别模块 SIM卡。
11、 一种电子设备, 其特征在于: 所述电子设备中包括权利要求 1至 10任一项所 述的智能卡连接电路。
12、 根据权利要求 11所述的电子设备, 其特征在于: 所述电子设备为移动电话或 平板电脑。
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CN103094793B (zh) 2015-11-25
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