Implementation to detect failure or fault on an analog input path for single analog input functional safety applications

US11668763B2 · kind B2 · utility

Assignee

• Infineon Technologies AG · DE

Inventors

• Ketan Dewan · Unterhaching, DE
• Rocco Calabro · Villach, AT
• Juergen Schaefer · Oberhaching, DE

Key dates

• Filing date: May 9, 2022
• Grant date: Jun 6, 2023
• Expiry date: May 9, 2042

Classification

• Technology area (CPC H): Electricity
• CPC primary: H03M1/124
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

An analog fault detection circuit is disclosed. The analog fault detection circuit comprises an input terminal, an input circuit path coupled to the input terminal at a first end and a first sampling switch coupled to the second end of the input circuit path. The first sampling switch is configured to sample an input path voltage at the second end of the input circuit path to provide a first analog to digital converter (ADC) input voltage. The analog fault detection circuit further comprises a first ADC conversion circuit configured to convert the first ADC input voltage to a first digital ADC output; and a first broken wire detection circuit coupled between the first sampling switch and the first ADC conversion circuit, and configured to adaptively pulldown or pullup the first ADC input voltage, in order to detect a fault associated with a first analog circuit path.