公开(公告)号：US20160124552A1

公开(公告)日：2016-05-05

申请号：US14993626

申请日：2016-01-12

Applicant: ROHM CO., LTD.

Inventor： Yukihiro IWAMOTO ,  Yuji SHIMADA

IPC: G06F3/044 ,  G06F3/047 ,  G06F3/041

CPC classification number: G06F3/044 ,  G01R27/2605 ,  G06F3/0416 ,  G06F3/047 ,  H03K17/962

Abstract: A capacitance voltage conversion circuit, which converts respective capacitances of a plurality of sensor capacitors into voltages, includes: a plurality of capacitance current conversion circuits disposed in respective correspondence with the sensor capacitors, each capacitance current conversion circuit configured to generate a detection current corresponding to a capacitance of a corresponding sensor capacitor; a current average circuit configured to average a plurality of detection currents, which are respectively generated by the capacitance current conversion circuits, to generate an average current; and a plurality of current voltage conversion circuits disposed in respective correspondence with the sensor capacitors, each current voltage conversion circuit configured to convert a difference current between a corresponding detection current and the average current into a voltage.

Abstract translation: 将多个传感器电容器的各个电容转换成电压的电容电压转换电路包括：与传感器电容器分别对应配置的多个电容电流变换电路，各电容电流变换电路构成为产生与 相应传感器电容器的电容; 电流平均电路，被配置为平均由电容电流转换电路分别产生的多个检测电流，以产生平均电流; 以及与传感器电容器分别对应地设置的多个电流电压转换电路，每个电流电压转换电路被配置为将相应的检测电流和平均电流之间的差电流转换为电压。

公开(公告)号：US20240405772A1

公开(公告)日：2024-12-05

申请号：US18805727

申请日：2024-08-15

Applicant: ROHM CO., LTD.

Inventor： Yosuke YAMANAKA ,  Yuji SHIMADA ,  Koji SAITO

IPC: H03K17/691

Abstract: For example, a pulse transmission circuit includes: a constant current source configured to generate a constant current; a capacitor configured to be charged using the constant current (e.g., a charge current generated by mirroring the constant current); and a discharge switch configured to pass a discharge current from the capacitor to a transformer according to a pulse edge in an input pulse signal, thereby to pulse-drive the transformer.

公开(公告)号：US20210303097A1

公开(公告)日：2021-09-30

申请号：US17211170

申请日：2021-03-24

Applicant: ROHM CO., LTD.

Inventor： Yuji SHIMADA

IPC: G06F3/041 ,  H03K17/96 ,  G06F3/044 ,  G01D5/24

Abstract: The present disclosure provides a capacitance detection circuit capable of reducing a chip area. The present disclosure relates to a capacitance detection circuit and an input device. A sense pin of the capacitance detection circuit is connected to a sensor electrode. A first driving unit applies a high voltage or a low voltage to the sense pin. A second driving unit applies the high voltage or the low voltage to a first terminal of a reference capacitor. A third driving unit applies the high voltage or the low voltage to a second terminal of the reference capacitor. A first switch is disposed between the sense pin and the first terminal of the reference capacitor. A second switch is disposed between an input of a post-stage circuit block and the first terminal of the reference capacitor.

公开(公告)号：US20190257870A1

公开(公告)日：2019-08-22

申请号：US16275834

申请日：2019-02-14

Applicant: ROHM CO., LTD.

Inventor： Yuji SHIMADA

IPC: G01R27/26 ,  H03F3/45 ,  G06F3/044 ,  G06F3/041

Abstract: A capacitance detection circuit for measuring an electrostatic capacitance, includes: a control signal generator configured to generate a control signal; a drive circuit having a push-pull type output stage and configured to apply a drive voltage to the electrostatic capacitance according to the control signal; a current detection circuit configured to generate a detection current which is a replica of a current flowing through the output stage of the drive circuit; and an integrating circuit configured to integrate the detection current to generate a detection voltage.

公开(公告)号：US20190107920A1

公开(公告)日：2019-04-11

申请号：US16156420

申请日：2018-10-10

Applicant: ROHM CO., LTD.

Inventor： Yuji SHIMADA

IPC: G06F3/041 ,  H03K17/96 ,  G06F3/045

Abstract: There is provided a control circuit configured for a touch panel. The touch panel includes: a first resistive film and a second resistive film installed with a gap between the first resistive film and the second resistive film; and a first terminal and a second terminal that extend from two opposing sides of the first resistive film. The control circuit includes: a driving circuit configured to apply a driving voltage between the first terminal and the second terminal; and a current detection circuit configured to generate a digital current detection value that indicates a current amount obtained by subtracting a predetermined current from a panel current flowing between the first terminal and the second terminal.

公开(公告)号：US20210303098A1

公开(公告)日：2021-09-30

申请号：US17211204

申请日：2021-03-24

Applicant: ROHM CO., LTD.

Inventor： Yuji SHIMADA ,  Go HARUMI

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

Abstract: A capacitance detection circuit that is capable of reducing the influence of an environmental variation such as temperature. The capacitance detection circuit detects an electrostatic capacitance of a sensor electrode. A sense pin is connected to the sensor electrode. An analog front end circuit converts the electrostatic capacitance of the sensor electrode to an electrical signal, wherein an input-output characteristic of the analog front end circuit is variable. A controller adjusts the input-output characteristic of the analog front end circuit according to the environmental variation.

公开(公告)号：US20200159352A1

公开(公告)日：2020-05-21

申请号：US16688083

申请日：2019-11-19

Applicant: ROHM CO., LTD.

Inventor： Yuji SHIMADA

IPC: G06F3/044 ,  G01R27/26

Abstract: The present disclosure provides a touch detection circuit which comes with additional, new functions, an input device and an electronic apparatus.N first terminals (Ps) are each connected with a corresponding first electrode (Es). A second terminal (Pc) is connected with a second electrode (Ec). N first capacitance detection circuits (210) correspond to the N first terminals (Ps), change voltages of the first terminals (Ps), respectively, and each generate a first detection signal indicating an electrostatic capacitance of the corresponding first electrode (Es) in accordance with movement of a charge produced in the corresponding first terminal (Ps). A cancelling circuit (240) driving the second terminal (Pc) in a manner that a voltage of the second terminal (Pc) follows a voltage of the first terminal (Ps). A second capacitance detection circuit (260) generating a second detection signal indicating an electrostatic capacitance of the second electrode (Ec).

公开(公告)号：US20170300148A1

公开(公告)日：2017-10-19

申请号：US15486715

申请日：2017-04-13

Applicant: ROHM CO., LTD.

Inventor： Yuji SHIMADA

IPC: G06F3/044

CPC classification number: G06F3/044 ,  G06F3/0416 ,  G06F3/0418

Abstract: A capacitance measurement circuit measures each of multiple electrostatic capacitances. Charger circuits respectively correspond to a sensor capacitance Cs. Each charger circuit charges the corresponding sensor capacitance Cs so as to generate a detection current Is that corresponds to a charging current ICHG. A current averaging circuit is configured to be switchable between the on state and the off state. In the on state, the current averaging circuit outputs an average current IAVE obtained by averaging the detection currents Is generated by the multiple charger circuits. In the off state, the current averaging circuit outputs an average current IAVE of zero. The capacitance measurement circuit measures each sensor capacitance Cs based on a differential current between the corresponding detection current Is and the average current IAVE.