公开(公告)号：US20240151751A1

公开(公告)日：2024-05-09

申请号：US18053905

申请日：2022-11-09

申请人： Allegro MicroSystems, LLC

发明人： Matthieu THOMAS ,  Radek ZEIPL ,  Petr BILY

IPC分类号： G01R19/165 ,  G01R15/20 ,  G01R19/10 ,  H03K5/24 ,  H03K19/20

CPC分类号： G01R19/16571 ,  G01R15/202 ,  G01R15/205 ,  G01R19/10 ,  H03K5/24 ,  H03K19/20

摘要： Output buffer diagnostic circuits for monitoring a sensor output buffer include a duplicate resistive network corresponding to a resistive network in the monitored sensor output buffer. The duplicate resistive network may include the same or similar topology as the output buffer resistive network. The duplicate resistive network is configured to produce a differential duplicate signal indicative of when an error condition exits in the sensor output buffer. The diagnostic circuit can include averaging circuitry configured to receive the differential duplicate signal and produce an average duplicate signal. The diagnostic circuit can include an error comparison circuit configured to receive the average duplicate signal and detect when the average duplicate signal exceeds a nominal or preset error value corresponding to an error condition in the sensor output buffer. The error comparison circuit is configured to produce an error indication when the average duplicate signal exceeds the preset error value.