Electric circuit for testing a power-on reset circuit
AssigneeRobert Bosch GmbH
InventorHarish Balasubramaniam
Life of this patent
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Abstract
An electric circuit for testing a power-on reset circuit. The electric circuit including a comparator, which is configured to detect an undervoltage for an input voltage to be compared to a reference voltage and to output an output signal, a first noise filter for filtering out noise from the output signal received as a first input signal for a first time period and for outputting a first filtered output signal of a second noise filter for filtering out noise from a second input signal for a second time period, and for outputting a second filtered output signal, and a digital part having an OR gate for the logical linkage of a first filtered output signal and a second filtered output signal for the output of a power-on reset signal.
Claims12
An electric circuit for testing a power-on reset circuit, comprising:
- a comparator to detect an undervoltage for an input voltage by comparing the input voltage to a reference voltage, and to output an output signal, wherein the power-on reset circuit includes the comparator;
- a first noise filter to filter out noise from the output signal received as a first input signal for a first time period and to output a first filtered output signal;
- a second noise filter to filter out noise from a second input signal for a second time period and to output a second filtered output signal;
- a digital part including an OR gate for a logical linkage of the first filtered output signal and the second filtered output signal for an output of a power-on reset signal;
- and
- a circuit to supply a test signal for the comparator or the second noise filter;
- wherein the digital part periodically performs a built-in self-test (BIST) during a normal operating mode to test whether the power-on reset circuit is functioning properly, so long as the power-on reset is inactive.
Dependencies are inferred from the claim text.