Switch circuit
AssigneeSony Corporation
InventorsMitsuru Nakada, Masaaki Takesue
Life of this patent
Estimating the term…
Abstract
A switch circuit includes: a first charge/discharge circuit having a fixed first time constant; a second charge/discharge circuit having a second time constant associated with the operation statuses of a plurality of switches; first and second input/output ports to which the first and second charge/discharge circuits are connected, respectively; and a control section adapted to measure the first and second time constants by charging or discharging the first and second charge/discharge circuits and determine the operation statuses of a plurality of switches based on the ratio of the measured first and second time constants.
Claims12
A switch circuit comprising:
- a first charge/discharge circuit having a fixed first time constant;
- a second charge/discharge circuit having a second time constant associated with operation statuses of a plurality of switches and including a plurality of resistors and the plurality of switches, each of the switches connected in parallel only with one of the plurality of resistors;
- first and second general purpose input/output (GPIO) ports to which the first and second charge/discharge circuits are connected, respectively;
- and
- a control section adapted to measure the first and second time constants by charging or discharging the first and second charge/discharge circuits and determine the operation statuses of the plurality of switches based on a ratio of the measured first and second time constants.
Dependencies are inferred from the claim text.