A method and system for short circuit detection and protection based on mobile terminal fingerprint system

Abstract

The invention discloses a method and system based on short-circuit detection and protection of the fingerprint system of a mobile terminal. The method includes: the upper-layer Finger Print service system of the mobile terminal sends an instruction to inquire about the status of the device, and reads and detects the fingerprint register information; judges the fingerprint register Whether the information is read normally; when the register information cannot be read normally, the mobile terminal turns off the LDO output of the FP in the PMU, and the upper Finger Print service system prompts an abnormal error; otherwise, the mobile terminal enters the normal working process. The present invention reads and detects the register information of the fingerprint sensor. When the reading is abnormal, the LDO output of the FP in the PMU is turned off in time, and the server prompts an abnormal error, so as to prevent short circuit in the abnormal state of the fingerprint sensor and avoid failure of the power supply in time. Closing causes current shock to cause the mobile terminal to become hot and damaged.

Description

technical field [0001] The invention relates to the technical field of mobile terminals, in particular to a method and system for short-circuit detection and protection based on a fingerprint system of a mobile terminal. Background technique [0002] As the fingerprint identification function is more and more used in mobile terminals, it has a good experience in mobile terminal unlocking, payment and information protection. [0003] At present, mobile terminals equipped with fingerprint sensors use sensors provided by external module manufacturers in circuit design. Mobile terminal PCBs only need to design related communication signal interfaces and LDO (low dropout regulator, which is a low dropout linear regulator. It mainly plays the role of power conversion) power output interface, which provides power and signal path for sensor communication. This kind of external fingerprint sensor usually needs to be attached to the surface of the terminal, which is vulnerable to imp...

AI Technical Summary

Problems solved by technology

This kind of external fingerprint sensor usually needs to be attached to the surface of the terminal, which is vulnerable to impact. During the use of the mobile terminal, it will often fall or be hit by external force, which will easily lead to damage to the interface and short-circuit damage of the module. It is not known and the power supply cannot be turned off in time, resulting in short-circuit and overheating of the mobile terminal, causing damage to the mobile terminal

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