公开(公告)号：US20220074991A1

公开(公告)日：2022-03-10

申请号：US17100286

申请日：2020-11-20

Applicant: Silicon Laboratories Inc.

Inventor： Matthew R. Williamson ,  Sebastian Ahmed

IPC: G01R31/327 ,  H03K19/21 ,  H03K5/24

Abstract: A switch sensor for sensing a state of a switch including a programmable memory, pulse generation circuitry, and comparator circuitry. The memory stores a state value indicative of a detected state of the switch. The pulse generation circuitry provides a pulse-train voltage signal to a first end of the switch, in which the pulse-train voltage signal is toggled between an active state for switch state detection and an inactive state for conserving power. A second terminal of the switch is coupled through resistive circuitry to a supply voltage node and may be coupled to an input terminal of the sensor. The comparator circuitry compares a state of the input terminal with the state value when the pulse-train voltage signal is in the active state for providing a state change signal indicative thereof.

公开(公告)号：US11313909B2

公开(公告)日：2022-04-26

申请号：US17100286

申请日：2020-11-20

Applicant: Silicon Laboratories Inc.

Inventor： Matthew R. Williamson ,  Sebastian Ahmed

IPC: G01R31/327 ,  H03K5/24 ,  H03K19/21

Abstract: A switch sensor for sensing a state of a switch including a programmable memory, pulse generation circuitry, and comparator circuitry. The memory stores a state value indicative of a detected state of the switch. The pulse generation circuitry provides a pulse-train voltage signal to a first end of the switch, in which the pulse-train voltage signal is toggled between an active state for switch state detection and an inactive state for conserving power. A second terminal of the switch is coupled through resistive circuitry to a supply voltage node and may be coupled to an input terminal of the sensor. The comparator circuitry compares a state of the input terminal with the state value when the pulse-train voltage signal is in the active state for providing a state change signal indicative thereof.