STYLUS WITH LOW-POWER DETECTOR

摘要

In one embodiment, a stylus includes a receiver for receiving signals wirelessly transmitted by a device. The stylus can alternate, during a first period of time, power supplied to the receiver between a first power for a first duration and a second power for a second duration. The first power is greater than the second power. The stylus can determine how many events exceeding an event criteria occurred the each first duration, and if the events exceed a threshold, the stylus can initiate wakeup components in the stylus for communicating with the device by initiating a provision of third power to those components. The third power is greater than the first power. When the first period of time expires, the stylus can provide low power to the receiver for a second period of time.

主权项

1. A stylus comprising:
a receiver operable to receive one or more signals transmitted wirelessly from a device; and circuitry conductively coupled to the receiver, the circuitry configured to perform operations comprising:
alternating, during a first period of time, a power supplied to the receiver between a first power for a first duration and a second power for a second duration, wherein the first power is greater than the second power;determining, for each instance of the first duration, a value identifying a quantity of events received by the receiver during that instance, each event being based on a characteristic of a received signal meeting an event criteria;determining, for each instance of the first duration, whether value identifying the quantity of events received by the receiver during that instance exceeds a threshold value;initiating, based at least on the value identifying the quantity of events received by the receiver during that instance exceeding the threshold value, provision of a third power to one or more stylus components for communicating with the device, wherein the third power is greater than the first power;determining whether the first period of time has expired; andproviding, based at least on determining that the first period of time has expired, the receiver with the second power for a second period of time, wherein the first duration and the second duration are each less than the second period of time.