公开(公告)号：US20170371478A1

公开(公告)日：2017-12-28

申请号：US15488504

申请日：2017-04-16

Applicant: Renesas Electronics Corporation

Inventor： Masato HIRAI ,  Kosuke FUWA

IPC: G06F3/041 ,  G06F3/044

CPC classification number: G06F3/0416 ,  G06F3/03545 ,  G06F3/044 ,  G06F3/046 ,  G06F2203/04106

Abstract: A reception unit (13) sequentially selects a plurality of sensor coils and receives a signal from a position indicator via the sensor coil that has been selected, and an operational circuit (14) detects, using an amplitude value and a phase value of the signal received by the reception unit (13) via each of the plurality of sensor coils, coordinates of a position indicated by the position indicator and a writing force of the position indicator. When the sensor (20) includes a sensor capacitor, a transmission unit (12) outputs a signal to the sensor capacitor, the reception unit (13) receives a signal generated at a connecting point between the sensor capacitor and the transmission unit (12), and the operational circuit (14) detects whether a touch key corresponding to the sensor capacitor has been touched using a phase value of the signal received by the reception unit (13).

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.