公开(公告)号：US09870113B2

公开(公告)日：2018-01-16

申请号：US15679771

申请日：2017-08-17

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.

公开(公告)号：US09846520B2

公开(公告)日：2017-12-19

申请号：US15616294

申请日：2017-06-07

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

IPC: G06F3/045 ,  G06F3/044 ,  G06F3/041 ,  G06F3/038 ,  G06F3/0354

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

公开(公告)号：US09772726B2

公开(公告)日：2017-09-26

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 ,  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.

公开(公告)号：US09703433B2

公开(公告)日：2017-07-11

申请号：US14461977

申请日：2014-08-18

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Praveesh Chandran ,  Baranidharan Karuppusamy ,  Giuseppe Noviello ,  Chee Weng Cheong ,  Leonard Dinu ,  Dianbo Guo ,  Kien Beng Tan ,  Chaochao Zhang

IPC: G06F3/045 ,  G06F3/044 ,  G06F3/0354 ,  G06F3/038 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/03545 ,  G06F3/0383 ,  G06F3/0416

Abstract: An active stylus is capacitively coupled to a capacitive touch panel for communication. The active stylus operates in a wait mode to receive initial communications from the panel. In response to such receipt, the active stylus synchronizes to a repeating communications frame implementing time division multiplexing. Communications from the active stylus to the panel include: information communications; synchronization communications and communications specific for columns and/or rows of the panel. Communications from the panel to the active stylus may be addressed uniquely to the stylus or commonly to a group of styluses.

公开(公告)号：US09696861B2

公开(公告)日：2017-07-04

申请号：US14641717

申请日：2015-03-09

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Leonard Dinu ,  Eng Jye Ng ,  Kien Beng Tan

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416

Abstract: A touch panel includes capacitive sensing electrodes and a touch controller operates in a first operating mode to detect a touch location on the touch panel. In a second operating mode, the touch controller transmits a modulated data signal through the touch panel to an active stylus. Each electrode is driven by a line driver circuit. A control circuit selectively actuates first ones of the line driver circuits to pass the modulated data signal to corresponding first ones of the electrodes which do not pass through a region of the touch panel associated with the location of the detected touch. Simultaneously, the control circuit selectively actuates second ones of the line driver circuits, different from said first ones of the line driver circuits, to ground corresponding second ones of the electrodes which do pass through the region of the touch panel associated with the location of the detected touch.

公开(公告)号：US08976151B2

公开(公告)日：2015-03-10

申请号：US13717766

申请日：2012-12-18

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: G06F3/045 ,  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 dual mode switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitance-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，以及响应于所提供的控制信号的相互模式控制信号的双模式切换电路 在互电容感测模式中从电容式触摸矩阵到电容 - 电压转换器，并且响应用于在自电容感测模式下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发模式控制信号， 其中电容感测电路可配置为在互电容感测模式或自电容感测模式下操作。

公开(公告)号：US20140078096A1

公开(公告)日：2014-03-20

申请号：US13717766

申请日：2012-12-18

Applicant: STMICROELECTRONICS S.R.I. ,  STMICROELECTRONICS ASIA PACIFIC PTE. LTD.

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

IPC: G06F3/044

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 dual mode switching circuit responsive to mutual mode control signals for a controlling signal supplied from a capacitive touch matrix to the capacitance-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，以及响应于所提供的控制信号的相互模式控制信号的双模式切换电路 在互电容感测模式中从电容式触摸矩阵到电容 - 电压转换器，并且响应用于在自电容感测模式下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发模式控制信号， 其中电容感测电路可配置为在互电容感测模式或自电容感测模式下操作。

公开(公告)号：US11658518B2

公开(公告)日：2023-05-23

申请号：US17408824

申请日：2021-08-23

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Baranidharan Karuppusamy ,  Thet Mon Sann ,  Kien Beng Tan ,  Supriya Raveendra Hegde ,  Huiqiao He ,  Teerasak Lee

IPC: H02J50/60 ,  H02J50/12

CPC classification number: H02J50/60 ,  H02J50/12

Abstract: A wireless power circuit operable in transceiver mode and in Q-factor measurement mode includes a bridge rectifier having first and second inputs coupled to first and second terminals of a coil, and an output coupled to a rectified node. An excitation circuit coupled to the first terminal, in Q-factor measurement mode, drives the coil with a pulsed signal. A protection circuit couples the first terminal to a first node when in Q-factor measurement mode and decouples the first terminal when in transceiver mode. A controller causes the bridge rectifier to short the first and second terminals to ground during Q-factor measurement mode. A sensing circuit amplifies voltage at the first node to produce an output voltage, and in response to the voltage at the first node rising to cross a rising threshold voltage, digitizes the output voltage. The digitized output voltage is used in calculating a Q-factor of the coil.

公开(公告)号：US10394349B2

公开(公告)日：2019-08-27

申请号：US15953017

申请日：2018-04-13

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Chee Weng Cheong ,  Leonard Liviu Dinu ,  Dianbo Guo ,  Kien Beng Tan

IPC: G06F3/038 ,  G06F3/041 ,  H04L27/00 ,  G06F3/0354

Abstract: A system and method for synchronizing two devices in communication with each other. When communication between the two devices is to be established, a synchronization process may be invoked. In an embodiment, a first device may initiate sending synchronization signals having rising edge and falling edge pairs. The second device may include a controller configured to receive the synchronization signals. However, noise may inhibit the ability of the controller to correctly receive and/or interpret the synchronization signals. Noise may cause detection components to falsely detect noise as a synchronization signal or may cause detection components to miss detection of an actual synchronization signal. A window generator may be used to generate comparison windows for the controller to detect synchronization signals. Further, the detection window duration and start times may be adjusted based on previously detected (or undetected) synchronization signals in order to compensate for noise overshadowing synchronization signals.

公开(公告)号：US20180329540A1

公开(公告)日：2018-11-15

申请号：US16042055

申请日：2018-07-23

Applicant: STMicroelectronics Asia Pacific Pte Ltd

Inventor： Kien Beng Tan

IPC: G06F3/044 ,  G06F3/041

CPC classification number: G06F3/044 ,  G06F3/0416

Abstract: A capacitive sensing system includes a capacitive sensing panel with drive lines and sense lines. Each drive line includes a drive circuit. A code generator operates to generate modulation codes. A drive controller generates drive signals wherein each drive signal is modulated by one of the modulation codes. The generated drive signals are applied to the drive lines through the drive circuits. The drive controller operates to simultaneously generate the drive signals for application to a corresponding group of drive lines during a drive period. Separate groups of drive lines are sequentially driven with the same drive signals during drive periods that only partially overlap.