Input device for and method of communication with capacitive devices through frequency variation

摘要

A computing device configured to receive data from a peripheral device, such as a stylus. The computing device includes a processor, a touch interface, such as a touch screen, in communication with the processor and configured to detect an input corresponding to an object approaching or contacting a surface. The computing device further includes a touch filter in communication with the touch interface and a peripheral filter in communication with the touch interface. The touch filter is configured to reject a peripheral frequency corresponding to a peripheral signal of the peripheral device and the peripheral filter is configured to reject a touch frequency component corresponding to a touch signal corresponding to a touch input.

主权项

1. A computing device configured to receive data from a peripheral device, comprising:
a processor; a touch interface in communication with the processor and configured to detect an input corresponding to an object approaching or contacting a surface, the touch interface comprising a plurality of drive lines coupled via a multiplexer to drive circuitry and a plurality of sense lines coupled to sense circuitry; a touch filter in the sense circuitry in communication with at least one of the plurality of sense lines and configured to reject a peripheral frequency corresponding to a peripheral signal of the peripheral device; a first peripheral filter in the sense circuitry in communication with the at least one of the plurality of sense lines and configured to reject a touch frequency component corresponding to a touch signal corresponding to a touch input; and a second peripheral filter in the drive circuitry in communication with at least one of the plurality of drive lines and configured to detect the peripheral signal of the peripheral device along the drive lines; wherein the multiplexer is configurable to: couple the drive lines to a stimulation signal in the drive circuitry when scanning the sense lines for the touch and peripheral signals: and couple the drive lines to the second peripheral filter in the drive circuitry when scanning the drive lines for the peripheral signal when the peripheral signal is detected by the sense circuitry in response to the stimulation signal.