Method and system for detecting and protecting short circuit of fingerprint system based on mobile terminal

Abstract

The invention discloses a method and a system for detecting and protecting a short circuit of a fingerprint system based on a mobile terminal. The method comprises the steps: an upper layer Finger Print (FP) service system of the mobile terminal sends a device status query command to read and detect fingerprint register information; whether the fingerprint register information is read normally is judged; when the register information cannot be read normally, the mobile terminal closes output of an LDO (Low Dropout Regulator) of an FP in a PMU (Phasor Measurement Unit) and the upper layer Finger Print service system prompts an abnormal error; and or else, the mobile terminal enters a normal working flow. According to the method and the device, the register information of a fingerprint sensor is read and detected; when reading abnormality occurs, the output of the LDO of the FP in the PMU is closed timely, a server prompts the abnormal error, the situation of the short circuit at the abnormal state of a fingerprint sensor is prevented and the problems of burning hot and damage of the mobile terminal caused by electric current shock due to incapability of timely close of a power supply are avoided.

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

Images