MIPI module ESD protection device

Abstract

The invention provides an MIPI (Mobile Industry Processor Interface) module ESD (Electro-Static Discharge) protection device. The MIPI module ESD protection device comprises a data and clock abnormal state MIPI state machine reset circuit, a combined data line frequency dividing circuit, and an MIPI integral reset circuit for data abnormal width exceeding a certain time; the three circuits are connected in parallel with one another. For the data and clock abnormal state MIPI state machine reset circuit, a low speed switching to high speed time series detection module is used for detecting whether a low speed switching to high speed time series exists on an MIPI data line or not, a low speed and high speed detection module is used for detecting whether the MIPI clock line is in a low speed state or not, and if the two conditions are satisfied at the same time, a first external MIPI switching-off module is used for switching off an MIPI module input interface of a display screen driver chip; an MIPI state machine reset module is used for resetting an MIPI state machine; an MIPI clock line low speed switching to high speed time series can be automatically generated by a first clock line low speed switching to high speed time series generation module; a first MIPI switching-on module is used for switching on the MIPI input interface again according to the reset result of the MIPI state machine and the MIPI clock line low speed switching to high speed time series, so that a function of receiving MIPI clock and data signals of a mobile phone primary board is recovered.

Description

technical field [0001] The invention relates to the technical field of MIPI and ESD protection, in particular, the invention relates to an ESD protection device for a MIPI module. Background technique [0002] MIPI (Mobile Industry Processor Interface, Mobile Industry Processor Interface) is an alliance established by ARM, Nokia, ST, TI and other companies in 2003. And other standardization, thereby reducing the complexity of mobile phone design and increasing the flexibility of design. [0003] The structure of the MIPI module in the prior art is a standard MIPI module without an ESD (Electro-Static Discharge, electrostatic discharge) protection circuit. [0004] Therefore, the defects in the prior art are as follows: [0005] I. ESD interference keeps the MIPI module of the display driver chip (slave) in low-speed mode, causing the mobile phone main board (host) to fail to receive high-speed data and cannot recover by itself. [0006] II. ESD interference makes the two ...

AI Technical Summary

Problems solved by technology

[0005] I. ESD interference keeps the MIPI module of the display driver chip (slave) in low-speed mode, causing the main board (host) of the mobile phone to fail to receive high-speed data and cannot recover by itself

[0006] II. ESD interference makes the two data lines of the MIPI module of the display driver chip (slave) out of phase, causing the mobile phone main board (host) to fail to receive high-speed data and cannot recover by itself

[0007] III. ESD interference causes the MIPI module of the display driver chip (slave) to appear in other unknown states, causing the main board (host) of the mobile phone to fail to receive high-speed data and cannot recover by itself

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