公开(公告)号：US20230188135A1

公开(公告)日：2023-06-15

申请号：US18086193

申请日：2022-12-21

申请人： Cypress Semiconductor Corporation

发明人： Paul WALSH ,  Kofi MAKINWA ,  Matheus PIMENTA ,  Çagri GÜRLEYÜK ,  Dermot MACSWEENEY ,  Daniel O KEEFFE ,  Dennis SEGUINE

IPC分类号： H03K17/95 ,  G01V3/10 ,  G01D5/20 ,  G01R27/26

CPC分类号： H03K17/9547 ,  H03K17/9502 ,  G01V3/102 ,  G01D5/2006 ,  G01R27/2611

摘要： One inductive sensor is configured to maintain a fixed frequency in a resonant circuit. One apparatus includes an inductance-to-digital converter (LDC). The LDC includes a digital filter to measure an inductance change of a sensor and convert the inductance change to a digital value. The LDC further includes a digital control loop to maintain a fixed frequency in the sensor. The sensor forms an oscillator in the digital control loop. An output of the digital control loop is representative of the inductance change of the sensor.

公开(公告)号：US20240283451A1

公开(公告)日：2024-08-22

申请号：US18608691

申请日：2024-03-18

申请人： Cypress Semiconductor Corporation

发明人： Paul M. Walsh ,  Kofi MAKINWA ,  Matheus PIMENTA ,  Çagri GÜRLEYÜK ,  Dermot MACSWEENEY ,  Daniel O'KEEFFE ,  Dennis R. SEGUINE

IPC分类号： H03K17/95 ,  G01D5/20 ,  G01R27/26 ,  G01V3/10

CPC分类号： H03K17/9547 ,  G01D5/2006 ,  G01R27/2611 ,  G01V3/102 ,  H03K17/9502

摘要： Front-end circuits that combine inductive and capacitive sensing are described. In one embodiment, an apparatus includes a plurality of inductive elements, an inductive measurement circuit, and a frequency divider circuit. The inductive measurement circuit is to output a first signal with a first frequency. The first signal is associated with an inductance change of one of the inductive elements. A feedback circuit can maintain the sinusoidal operation of the first signal. The frequency divider circuit can generate a second signal with a second frequency that is lower than the first frequency.

公开(公告)号：US20230120634A1

公开(公告)日：2023-04-20

申请号：US18083310

申请日：2022-12-16

申请人： Cypress Semiconductor Corporation

发明人： Paul M. WALSH ,  Said HUSSAINI ,  Dermot MACSWEENEY ,  Hui JIANG ,  Kofi MAKINWA

IPC分类号： G06F3/041 ,  G01R27/26 ,  H03M1/12 ,  G06F3/044 ,  H03M1/14 ,  H03M1/48

摘要： An asynchronous capacitance-to-digital conversion is described that allows for very low-power operation when during inactive periods (when no conductive object is in contact or proximity to the sensing electrodes). Asynchronous operation of a capacitance-to-digital converter (CDC) provides for capacitance-to-digital conversion without the use of system resources and more power intensive circuit elements.