Power management unit redundancy reset system, automobile chip and automobile

By designing a redundant reset system for power management unit including voltage stabilization module, native power-on reset module, internal redundant power-on reset module, reset mode configuration module and reset signal output module, the problem of the PMU power-on reset detection module being unable to output reset signals due to process factors is solved, the chip operation stability and reliability is improved, and the requirements of ISO26262 are met.

CN119668383AActive Publication Date: 2025-03-21CHONGQING CHANGAN AUTOMOBILE CO LTD
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Patent Information

Application Number
CN202311221626.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-20
Publication Date
2025-03-21
Estimated Expiration
2043-09-20

AI Technical Summary

Technical Problem

In the prior art, the power-on reset detection module of the power management unit (PMU) cannot output a reset signal due to process factors, which affects the overall function operation of the chip system.

Method used

Design a redundant reset system for power management unit, including a voltage stabilization module, a native power-on reset module, an internal redundant power-on reset module, a reset mode configuration module and a reset signal output module. Through the coordinated work of these modules, it is ensured that the reset signal can be provided when the native power-on reset module fails.

Benefits of technology

It improves the operating stability and reliability of the chip, avoids affecting the overall function of the chip system after PMU failure, meets the requirements of ISO26262 for single point failure, and ensures personal safety.

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Abstract

The invention relates to a power management unit redundancy reset system, an automobile chip and an automobile. The reset system comprises a voltage stabilization module, a native power-on reset module, an internal redundancy power-on reset module, a reset mode configuration module and a reset signal output module. Digital voltage is accessed through the voltage stabilizing module, and the digital voltage is converted into analog voltage to be input to the original power-on reset module and the internal redundancy power-on reset module. In the boosting process, the original power-on reset module continuously detects the climbing of the digital voltage and the analog voltage, and can output a reset signal to the chip function system after the digital voltage reaches a first threshold value and the analog voltage reaches a second threshold value. In addition, the internal redundant power-on reset module can also continuously detect the climbing of the analog voltage and output the reset signal to the chip function system when the analog voltage reaches the third threshold value, so that the reset signal can be provided when the original power-on reset module fails, and the operation stability and reliability of the chip can be improved.
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