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    CAPACITIVE DISCHARGE CIRCUIT FOR TOUCH SENSITIVE SCREEN
    23.
    发明申请
    CAPACITIVE DISCHARGE CIRCUIT FOR TOUCH SENSITIVE SCREEN 审中-公开

    公开(公告)号：US20180101264A1

    公开(公告)日：2018-04-12

    申请号：US15838675

    申请日：2017-12-12

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Chee Weng Cheong ,  Dianbo Guo ,  Kien Beng Tan ,  Yannick Guedon

    IPC: G06F3/044 ,  G06F3/041

    CPC classification number: G06F3/044 ,  G06F3/041 ,  G06F3/0418

    Abstract: A capacitive discharge circuit includes a line having a capacitance, a switched capacitor circuit including a capacitor, a switched circuit coupled to the line, and a voltage regulator coupled between the switched capacitor circuit and the switched circuit. A controller operates the switched capacitor circuit and switched circuit to in a first phase, charge the capacitor by coupling the capacitor between a common mode and a power supply, and in a second phase, discharge the capacitor by coupling the voltage regulator in series with the capacitor between the power supply node a ground. The controller is also configured to in a third phase, charge the capacitor by coupling the capacitor between the common mode and the power supply, and in a fourth phase, share charge between the line and the capacitor by coupling the voltage regulator and the capacitor in series between the line and the ground.

    Chip synchronization by a master-slave circuit
    25.
    发明授权
    Chip synchronization by a master-slave circuit 有权

    公开(公告)号：US09846665B2

    公开(公告)日：2017-12-19

    申请号：US14534091

    申请日：2014-11-05

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Chaochao Zhang ,  Chee Weng Cheong ,  Dianbo Guo

    IPC: G06F13/364 ,  G06F5/06 ,  G06F13/42

    CPC classification number: G06F13/364 ,  G06F5/065 ,  G06F13/4282 ,  G06F2205/067

    Abstract: A master-slave circuit is disclosed that maintains synchronization between two integrated circuit chips, using minimal chip resources. In one embodiment, a single, bidirectional communication path is shared by the two chips. Meanwhile, only one I/O port on each chip is used to send and receive signals via the bidirectional communication path. The first chip to detect a signal event is designated the master and controls the bidirectional communication path. The master can communicate the status to the other chip by controlling the logic state of the I/O ports. When the second chip detects that the I/O port is controlled by the first chip, the second chip will logically deduce that it is now the slave. If both chips detect the signal event at substantially the same time, one of the two chips is pre-programmed to assume control of the I/O port as the master.

    Temperature insensitive transient current source
    27.
    发明授权
    Temperature insensitive transient current source 有权
    温度不敏感瞬态电流源

    公开(公告)号：US09523994B2

    公开(公告)日：2016-12-20

    申请号：US14201590

    申请日：2014-03-07

    Applicant: STMicroelectronics Asia Pacific Pte. Ltd.

    Inventor： CheeWeng Cheong ,  Kien Beng Tan ,  Dianbo Guo

    IPC: G05F3/26 ,  G05F3/16

    CPC classification number: G05F3/16 ,  G05F3/262

    Abstract: A current source includes a first current path including a first current mirror transistor and an input current source coupled in series, a second current path including a second current minor transistor, wherein control terminals of the first and second current minor transistors are connected, a first circuit configured to provide a controlled auxiliary current in the second current path, and a second circuit configured to provide a controlled output current in the second current path when or after the auxiliary current has reached steady state. The current source may include one or more cascode transistors in the first current path and one or more cascode transistors in the second current path. The first circuit may be activated before the second circuit is activated.

    Abstract translation: 电流源包括包括串联耦合的第一电流镜晶体管和输入电流源的第一电流路径，包括第二电流次级晶体管的第二电流路径，其中连接第一和第二电流次级晶体管的控制端，第一 电路，被配置为在第二电流路径中提供受控的辅助电流;以及第二电路，被配置为在辅助电流达到稳定状态时或之后提供第二电流路径中的受控输出电流。 电流源可以包括第一电流路径中的一个或多个共源共栅晶体管和第二电流路径中的一个或多个共源共栅晶体管。 第一电路可以在第二电路被激活之前被激活。

    Configurable analog front-end for mutual capacitance sensing and self capacitance sensing
    28.
    发明授权
    Configurable analog front-end for mutual capacitance sensing and self capacitance sensing 有权
    可配置的模拟前端，用于互电容感测和自电容感测

    公开(公告)号：US09523725B2

    公开(公告)日：2016-12-20

    申请号：US14322244

    申请日：2014-07-02

    Applicant: STMicroelectronics Asia Pacific Pte Ltd ,  STMicroelectronics S.r.l.

    Inventor： Kien Beng Tan ,  Ernesto Lasalandra ,  Tommaso Ungaretti ,  Yannick Guedon ,  Dianbo Guo ,  Paolo Angelini ,  Giovanni Carlo Tripoli

    IPC: G01R27/26 ,  G06F3/044 ,  G06F3/041

    CPC classification number: G01R27/2605 ,  G06F3/0416 ,  G06F3/044 ,  G06F2203/04104

    Abstract: Capacitance sensing circuits and methods are provided. A dual mode capacitance sensing circuit includes a capacitance-to-voltage converter having an amplifier and an integration capacitance coupled between an output and an inverting input of the amplifier, and a switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitive to voltage converter in a mutual capacitance sensing mode and responsive to self mode control signals for controlling signals supplied from the capacitive touch matrix to the capacitance-to-voltage converter in a self capacitance sensing mode, wherein the capacitance sensing circuit is configurable for operation in the mutual capacitance sensing mode or the self capacitance sensing mode.

    Abstract translation: 提供电容感测电路和方法。 双模电容感测电路包括具有放大器和耦合在放大器的输出和反相输入端之间的积分电容器的电容 - 电压转换器，以及响应于从模拟信号提供的控制信号的相互模式控制信号的开关电路 电容式触摸矩阵到互电容感测模式中的电容到电压转换器，并且响应于用于在自电容感测模式中控制从电容式触摸矩阵提供给电容 - 电压转换器的信号的自模式控制信号，其中电容感测 电路可配置为在互电容感测模式或自身电容感测模式下工作。

    CAPACITIVE DISCHARGE CIRCUIT FOR TOUCH SENSITIVE SCREEN
    29.
    发明申请
    CAPACITIVE DISCHARGE CIRCUIT FOR TOUCH SENSITIVE SCREEN 有权
    用于触摸敏感屏幕的电容放电电路

    公开(公告)号：US20160124541A1

    公开(公告)日：2016-05-05

    申请号：US14531631

    申请日：2014-11-03

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Chee Weng Cheong ,  Dianbo Guo ,  Kien Beng Tan ,  Yannick Guedon

    IPC: G06F3/044 ,  G09G5/18

    CPC classification number: G06F3/044 ,  G06F3/041 ,  G06F3/0418

    Abstract: A capacitive discharge circuit includes a line having a capacitance, a switched capacitor circuit including a capacitor, a switched circuit coupled to the line, and a voltage regulator coupled between the switched capacitor circuit and the switched circuit. A controller operates the switched capacitor circuit and switched circuit to in a first phase, charge the capacitor by coupling the capacitor between a common mode and a power supply, and in a second phase, discharge the capacitor by coupling the voltage regulator in series with the capacitor between the power supply node a ground. The controller is also configured to in a third phase, charge the capacitor by coupling the capacitor between the common mode and the power supply, and in a fourth phase, share charge between the line and the capacitor by coupling the voltage regulator and the capacitor in series between the line and the ground.

    Abstract translation: 电容放电电路包括具有电容的线路，包括电容器的开关电容器电路，耦合到线路的开关电路以及耦合在开关电容器电路和开关电路之间的电压调节器。 控制器将开关电容器电路和开关电路在第一相中进行操作，通过在公共模式和电源之间耦合电容器对电容器进行充电，而在第二阶段，通过将电压调节器与 电源节点之间的电容器接地。 控制器还被配置为在第三阶段中，通过在公共模式和电源之间耦合电容器来对电容器进行充电，并且在第四阶段中，通过将电压调节器和电容器之间的耦合来在线路和电容器之间共享电荷 线与地之间的系列。

    MULTIPLE CONTROLLER COMMUNICATION METHOD FOR ACTIVE STYLUS DATA ACQUISITION
    30.
    发明申请
    MULTIPLE CONTROLLER COMMUNICATION METHOD FOR ACTIVE STYLUS DATA ACQUISITION 有权
    用于主动数据采集的多控制器通信方法

    公开(公告)号：US20160117047A1

    公开(公告)日：2016-04-28

    申请号：US14522098

    申请日：2014-10-23

    Applicant: STMicroelectronics Asia Pacific Pte Ltd

    Inventor： Leonard Dinu ,  Chao Chao Zhang ,  Dianbo Guo ,  Chee Weng Cheong ,  Eng Jye Ng

    IPC: G06F3/041 ,  G06F3/038 ,  G06F3/044 ,  G06F3/0354

    CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/038 ,  G06F3/0416 ,  G06F2203/04104 ,  G06F2203/04106

    Abstract: An electronic device may include a first controller associated with some channels of a digitizer having channels configured to receive a signal from a stylus, and with each channel having a direction. A second controller may be associated with channels of the digitizer not associated with the first controller. The first controller may scan for the signal at each channel associated with the first controller, and based on acquisition of the signal at a given channel associated with the first controller, calculate a property of the signal. The first controller may send the calculated property and the direction of the given channel to the second controller. The first controller and the second controller may scan for the signal at each channel having the direction of the given channel, at acquisition intervals based upon the calculated property.

    Abstract translation: 电子设备可以包括与数字转换器的一些通道相关联的第一控制器，其具有被配置为从触控笔接收信号的通道，并且每个通道具有方向。 第二控制器可以与不与第一控制器相关联的数字转换器的通道相关联。 第一控制器可以扫描与第一控制器相关联的每个信道处的信号，并且基于在与第一控制器相关联的给定信道处获取信号，计算信号的属性。 第一控制器可以将计算的属性和给定信道的方向发送到第二控制器。 第一控制器和第二控制器可以基于计算的属性以采集间隔扫描具有给定信道的方向的每个信道处的信号。

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