-
公开(公告)号：US20200296866A1
公开(公告)日：2020-09-17
申请号：US16575710
申请日：2019-09-19
Applicant: Microchip Technology Incorporated
Inventor： Eric Huang
Abstract: A keyboard for secure data entry is provided. The keyboard comprises at least one or more of data entry buttons that can be depressed by a user. For each of the data entry buttons, a button actuator is provided that is movable upon the user depressing the respective data entry button and a primary capacitive sensor is provided that is arranged to determine movement of the button actuator of the respective data entry button by capacitance sampling. The button actuator is at least partly made from a conductive material. The button actuator is coupled to a defined electric potential at least during the capacitance sampling to shield the primary capacitive sensor from eavesdropping.
-
公开(公告)号：US11406051B2
公开(公告)日：2022-08-02
申请号：US16575710
申请日：2019-09-19
Applicant: Microchip Technology Incorporated
Inventor： Eric Huang
Abstract: A keyboard for secure data entry is provided. The keyboard comprises at least one or more of data entry buttons that can be depressed by a user. For each of the data entry buttons, a button actuator is provided that is movable upon the user depressing the respective data entry button and a primary capacitive sensor is provided that is arranged to determine movement of the button actuator of the respective data entry button by capacitance sampling. The button actuator is at least partly made from a conductive material. The button actuator is coupled to a defined electric potential at least during the capacitance sampling to shield the primary capacitive sensor from eavesdropping.
-
公开(公告)号：US11199434B2
公开(公告)日：2021-12-14
申请号：US16799897
申请日：2020-02-25
Applicant: Microchip Technology Incorporated
Inventor： Eric Huang , Xiang Gao
Abstract: A level sensing controller includes a signal generator circuit to generate an excitation signal. The controller also includes a connection to route an inverse of the excitation signal to a first polar electrode of a first capacitor. The first polar electrode is coupled to a container to hold liquid. The controller also includes a connection to route the excitation signal to a second polar electrode of a second capacitor. The second positive polar electrode is coupled to the container. The controller also includes a connection to a sense electrode to form the first capacitor with the first polar electrode and to form the second capacitor with the second polar electrode. The controller also includes a measurement circuit configured to measure charge at sensing electrode and determine, based on the measured charge, whether a liquid in the container has reached a level of the second polar electrode.
-
公开(公告)号：US20200333175A1
公开(公告)日：2020-10-22
申请号：US16799897
申请日：2020-02-25
Applicant: Microchip Technology Incorporated
Inventor： Eric Huang , Xiang Gao
IPC: G01F23/26
Abstract: A level sensing controller includes a signal generator circuit to generate an excitation signal. The controller also includes a connection to route an inverse of the excitation signal to a first polar electrode of a first capacitor. The first polar electrode is coupled to a container to hold liquid. The controller also includes a connection to route the excitation signal to a second polar electrode of a second capacitor. The second positive polar electrode is coupled to the container. The controller also includes a connection to a sense electrode to form the first capacitor with the first polar electrode and to form the second capacitor with the second polar electrode. The controller also includes a measurement circuit configured to measure charge at sensing electrode and determine, based on the measured charge, whether a liquid in the container has reached a level of the second polar electrode.
-
-
-
Search Results
4
records
(took 0.013 seconds)
