Abstract: A stylus includes a first transmission circuit, a second transmission circuit, and a control circuit which controls the first and second transmission circuits according to a first transmission mode in which the control circuit controls the first transmission circuit to transmit a first downlink signal from a tip electrode and controls the second transmission circuit to not transmit a second downlink signal from a tail electrode, a second transmission mode in which the control circuit controls the first transmission circuit to not transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode, and a third transmission mode in which the control circuit controls the first transmission circuit to transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode.

Abstract: A stylus includes a first transmission circuit, a second transmission circuit, and a control circuit which controls the first and second transmission circuits according to a first transmission mode in which the control circuit controls the first transmission circuit to transmit a first downlink signal from a tip electrode and controls the second transmission circuit to not transmit a second downlink signal from a tail electrode, a second transmission mode in which the control circuit controls the first transmission circuit to not transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode, and a third transmission mode in which the control circuit controls the first transmission circuit to transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode.

Abstract: A serial communication method, which is performed by a device that detects a coordinate of a stylus and reports touch data including the detected coordinate to a host, includes: receiving a write command that includes data indicating a request for a descriptor; transmitting an interrupt in response to receiving of the write command; receiving a touch data transmission request, after the transmitting of the interrupt; transmitting the descriptor, in response to receiving the touch data transmission request, the descriptor including one or more report IDs and one or more report descriptors that each correspond to one of the one or more report IDs; producing the touch data and a first report including a first report ID of the one or more report IDs, in accordance with a first report descriptor corresponding to the first report ID; transmitting data indicating a size of the first report; and transmitting the first report.

Abstract: A method is provided to interface an active stylus with a sensor controller, wherein the sensor controller is coupled to a sensor configured to receive input from the active stylus. In the method the sensor controller caches stylus capability information of the active stylus. The stylus capability information includes setting information for inking used by an application program executed to display input from the active stylus on the sensor. The active stylus generates a hash value of the stylus capability information and transmits the hash value to the sensor controller when the active stylus enters a sensing zone of the sensor controller.

Abstract: A stylus includes a first transmission circuit, a second transmission circuit, and a control circuit which controls the first and second transmission circuits according to a first transmission mode in which the control circuit controls the first transmission circuit to transmit a first downlink signal from a tip electrode and controls the second transmission circuit to not transmit a second downlink signal from a tail electrode, a second transmission mode in which the control circuit controls the first transmission circuit to not transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode, and a third transmission mode in which the control circuit controls the first transmission circuit to transmit the first downlink signal from the tip electrode and controls the second transmission circuit to transmit the second downlink signal from the tail electrode.

Abstract: A stylus includes a cylindrical housing, a tip portion provided on a tip side of the housing and including a tip electrode, a tail portion provided on a tail side of the housing and including a tail electrode, a power circuit provided in the housing, a first transmission circuit which, in operation, receives power from the power circuit and generates a first downlink signal that is transmitted toward an outside of the housing through the tip electrode, a second transmission circuit which, in operation, receives power from the power circuit and generates a second downlink signal that is transmitted toward the outside of the housing through the tail electrode, the second downlink signal being different from the first downlink signal, and a control circuit which, in operation, controls the first transmission circuit and the second transmission circuit according to a plurality of transmission modes.

Abstract: A method is provided to interface an active stylus with a sensor controller, wherein the sensor controller is coupled to a sensor configured to receive input from the active stylus. In the method the sensor controller caches stylus capability information of the active stylus. The stylus capability information includes setting information for inking used by an application program executed to display input from the active stylus on the sensor. The active stylus generates a hash value of the stylus capability information and transmits the hash value to the sensor controller when the active stylus enters a sensing zone of the sensor controller.

Abstract: A method is provided for using an active stylus and a sensor controller that engage in two-way communication with each other. The sensor controller sends a beacon signal BS indicating reference time of a frame F. After detecting the beacon signal BS, the active stylus sends, included in a response signal to the beacon signal BS, a hash value CP_Hash associated with capability information indicating the type of one or more pieces of interactive data DF that can be obtained by the active stylus. The active stylus periodically sends data signals DF1,DF2, and so on, which include at least part of the one or more pieces of interactive data DF and which are configured in a format determined based on the one or more pieces of interactive data DF.

Abstract: A method is provided to interface an active stylus with a sensor controller, wherein the sensor controller is coupled to a sensor configured to receive input from the active stylus. In the method the sensor controller caches stylus capability information of the active stylus. The stylus capability information includes setting information for inking used by an application program executed to display input from the active stylus on the sensor. The active stylus generates a hash value of the stylus capability information and transmits the hash value to the sensor controller when the active stylus enters a sensing zone of the sensor controller.

Abstract: A serial communication method, which is performed by a device that detects a coordinate of a stylus and reports touch data including the detected coordinate to a host, includes: receiving a write command that includes data indicating a request for a descriptor; transmitting an interrupt in response to receiving of the write command; receiving a touch data transmission request, after the transmitting of the interrupt; transmitting the descriptor, in response to receiving the touch data transmission request, the descriptor including one or more report IDs and one or more report descriptors that each correspond to one of the one or more report IDs; producing the touch data and a first report including a first report ID of the one or more report IDs, in accordance with a first report descriptor corresponding to the first report ID; transmitting data indicating a size of the first report; and transmitting the first report.

Abstract: A serial communication method between a device and a host, in which the device reports touch data including a coordinate of a detected active stylus to a host. The host issues a write command that includes data indicating a request of a descriptor, to the device. After the device performs a predetermined process for the write command, the device transmits an interrupt to the host. The host requests the device to transmit the touch data, triggered by the host detecting the interrupt. The device transmits the descriptor in response to a request for transmission of the touch data. The method can enable a sensor controller to notify the host of the descriptor even in a case where communication is performed between the sensor controller and a host processor in accordance with a standard that does not provide a command usable for the device to notify the host of the descriptor.

Abstract: A method is provided for communication between a host processor and an active stylus via a sensor controller, wherein the sensor controller is coupled to a sensor configured to interact with the active stylus. The method includes generally three steps. First, the host processor transmits a command received from an application operating on the host processor. Second, the sensor controller receives the command from the host processor and forwards the command to the active stylus. Third, the active stylus, in response to the command, operates on the command and transmits a command response to the sensor controller.

Abstract: A method is provided to interface an active stylus with a sensor controller, wherein the sensor controller is coupled to a sensor configured to receive input from the active stylus. In the method the sensor controller caches stylus capability information of the active stylus. The stylus capability information includes setting information for inking used by an application program executed to display input from the active stylus on the sensor. The active stylus generates a hash value of the stylus capability information and transmits the hash value to the sensor controller when the active stylus enters a sensing zone of the sensor controller.

Abstract: A stylus includes a cylindrical housing, a tip portion provided on a tip side of the housing and including a tip electrode, a tail portion provided on a tail side of the housing and including a tail electrode, a power circuit provided in the housing, a first transmission circuit which, in operation, receives power from the power circuit and generates a first downlink signal that is transmitted toward an outside of the housing through the tip electrode, a second transmission circuit which, in operation, receives power from the power circuit and generates a second downlink signal that is transmitted toward the outside of the housing through the tail electrode, the second downlink signal being different from the first downlink signal, and a control circuit which, in operation, controls the first transmission circuit and the second transmission circuit according to a plurality of transmission modes.

Abstract: A method is provided to interface an active stylus with a sensor controller, wherein the sensor controller is coupled to a sensor configured to receive input from the active stylus. In the method the sensor controller defines data frames consisting of more than one time slot usable for receiving packets from the stylus. The active stylus transmits, in response to a request from the sensor controller, a signal including stylus capability information. The sensor controller determines, based on the stylus capability information, a downlink time slot allocation for use by the active stylus to transmit packets to the sensor controller. The sensor controller transmits the downlink time slot allocation to the active stylus.

Abstract: A method is provided to interface an active stylus with a sensor controller, wherein the sensor controller is coupled to a sensor configured to receive input from the active stylus. In the method the sensor controller caches stylus capability information of the active stylus. The stylus capability information includes setting information for inking used by an application program executed to display input from the active stylus on the sensor. The active stylus generates a hash value of the stylus capability information and transmits the hash value to the sensor controller when the active stylus enters a sensing zone of the sensor controller.

Abstract: A method is provided for communication between a host processor and an active stylus via a sensor controller, wherein the sensor controller is coupled to a sensor configured to interact with the active stylus. The method includes generally three steps. First, the host processor transmits a command received from an application operating on the host processor. Second, the sensor controller receives the command from the host processor and forwards the command to the active stylus. Third, the active stylus, in response to the command, operates on the command and transmits a command response to the sensor controller.

Abstract: A method for operating a sensor surface includes detecting an initial position of a stylus relative to the sensor surface, determining initial coordinate values based on the detected initial position of the stylus, and communicating the initial coordinate values for further processing. The method further includes determining subsequent coordinate values based on a subsequent position of the stylus detected after detecting the initial position and, based on a characteristic of the initial or subsequent position detection, modifying the subsequent coordinate values to represent a position that is different than the subsequent position of the stylus. The subsequent coordinate values may be modified to be the same as the initial coordinate values that represent the initial position of the stylus. The modified coordinate values are communicated for further processing.

Abstract: A method is provided for communication between a host processor and an active stylus via a sensor controller, wherein the sensor controller is coupled to a sensor configured to interact with the active stylus. The method includes generally three steps. First, the host processor transmits a command received from an application operating on the host processor. Second, the sensor controller receives the command from the host processor and forwards the command to the active stylus. Third, the active stylus, in response to the command, operates on the command and transmits a command response to the sensor controller.

Abstract: A stylus outputs an output value PO corresponding to a force Forg applied to a core body of the stylus, and includes an MCU. The MCU sets profile data representing a correspondence relation between a primary pen pressure value P1 and the output value PO based on a characteristic f1 of a pen pressure detecting portion PD of the stylus. The profile data broadly or indirectly defines a relation h between the force Forg and the output value PO. The MCU repeatedly obtains the primary pen pressure value P1 corresponding to the force Forg from the pen pressure detecting portion PD. The MCU, each time the primary pen pressure value P1 is obtained, obtains the output value PO from the primary pen pressure value P1 based on the profile data and outputs the output value PO. The stylus allows for decoupling (isolating) the configuration of the pen pressure detecting portion PD from the output value PO outputted from the stylus.