Method for waking a data transceiver through data reception

摘要

A method for managing power in a system, in which the system may include a first device configured to transmit serial data and a second device, coupled to the first device. The second device may include a transceiver and interrupt logic, and may be configured to activate the interrupt logic and enable a reduced power mode for the transceiver. Power consumption of the transceiver operating in the reduced power mode may be less than power consumption of the transceiver in an operating mode. The second device may also be configured to assert an interrupt signal responsive to a change in a voltage level of an input of the second device and then de-activate the reduced power mode for the transceiver responsive to the assertion of the interrupt signal.

主权项

1. A system comprising:
a first device configured to transmit serial data; and a second device, coupled to the first device, wherein the second device includes a transceiver and interrupt logic, wherein the second device is configured to:
activate the interrupt logic for a pin of the second device, wherein the pin is coupled to the transceiver and configured to receive the serial data; andenable a reduced power mode for the transceiver, wherein a power consumption of the transceiver operating in the reduced power mode is less than the power consumption of the transceiver operating in an operating mode; wherein the first device is further configured to transmit serial data to the second device by changing a voltage level of the pin of the second device; and wherein the second device is further configured to:
assert an interrupt signal in response to the change in the voltage level of the pin of the second device;de-activate the reduced power mode for the transceiver in response to the assertion of the interrupt signal; andreceive, via the pin and the transceiver, at least a portion of the serial data from the first device in response to the assertion of the interrupt signal.