公开(公告)号：US20190195703A1

公开(公告)日：2019-06-27

申请号：US16182188

申请日：2018-11-06

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Masato HIRAI ,  Takeshi YOSHIZAWA ,  Takeshi KUWANO

IPC: G01L1/14

CPC classification number: G01L1/144 ,  G01L1/146

Abstract: To improve the efficiency of pressure detection, a driver applies a positive-phase signal to a capacitance element from an opposite side to a coupling point in a control device. Another driver applies a reverse-phase signal to another capacitance element from an opposite side to the coupling point. A control unit detects pressures applied to the capacitance elements based on a potential fluctuation at the coupling point.

公开(公告)号：US20180300106A1

公开(公告)日：2018-10-18

申请号：US16007805

申请日：2018-06-13

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Masato HIRAI ,  Yuki HIGUCHI ,  Takeshi KUWANO ,  Kosuke FUWA

IPC: G06F7/50 ,  G06F7/523 ,  G06F3/046 ,  G06F3/041 ,  G06F3/0354 ,  G06F1/32

CPC classification number: G06F7/50 ,  G06F1/3203 ,  G06F3/03545 ,  G06F3/0416 ,  G06F3/046 ,  G06F7/523

Abstract: The speed of pen position detection is improved without increasing the circuit area and the current consumption.A sampling circuit samples a signal and outputs sampling data. A arithmetic circuit calculates a real part and an imaginary part of the sampling data. The arithmetic circuit classifies the real part of the sampling data into one of a plurality of groups and classifies the imaginary part of the sampling data into one of the groups according to an order of output of the sampling data from the sampling circuit. Then, the arithmetic circuit adds together real parts of sampling data belonging to a group and adds together imaginary parts of sampling data belonging to a group for each of the groups, and calculates amplitude and phase of the signal by using an addition result of the real parts and an addition result of the imaginary parts of each of the groups.

公开(公告)号：US20170199725A1

公开(公告)日：2017-07-13

申请号：US15402671

申请日：2017-01-10

Applicant: RENESAS ELECTRONICS CORPORATION

Inventor： Masato HIRAI ,  Yuki HIGUCHI ,  Takeshi KUWANO ,  Kosuke FUWA

IPC: G06F7/50 ,  G06F7/523

CPC classification number: G06F7/50 ,  G06F1/3203 ,  G06F3/03545 ,  G06F3/0416 ,  G06F3/046 ,  G06F7/523

Abstract: The speed of pen position detection is improved without increasing the circuit area and the current consumption. A sampling circuit samples a signal and outputs sampling data. A arithmetic circuit calculates a real part and an imaginary part of the sampling data. The arithmetic circuit classifies the real part of the sampling data into one of a plurality of groups and classifies the imaginary part of the sampling data into one of the groups according to an order of output of the sampling data from the sampling circuit. Then, the arithmetic circuit adds together real parts of sampling data belonging to a group and adds together imaginary parts of sampling data belonging to a group for each of the groups, and calculates amplitude and phase of the signal by using an addition result of the real parts and an addition result of the imaginary parts of each of the groups.