Car-mounted memory card interface short-circuit protection device

Abstract

The invention relates to a car-mounted memory card interface short-circuit protection device. The car-mounted memory card interface short-circuit protection device comprises a memory card interface seat, wherein the memory card interface seat comprises a power supply pin and an insertion detection pin; the power supply pin is connected to a power supply through a PTC overcurrent protection resistor, and the insertion detection pin is connected with a micro-control unit. By adopting the car-mounted memory card interface short-circuit protection device, the 3.3V power supply of the memory card interface to the memory card can be cut off rapidly in power supply short circuit, so that devices in the machine can be prevented from being damaged, the power supply can be automatically and rapidly restored after the short circuit is eliminated, the entire car-mounted system is safe and stable to operate, the safety of the devices in the machine can be guaranteed, and the irreversible damage of the devices in the machine caused by the short-circuit accident can be avoided.

Description

technical field [0001] The invention relates to the technical field of a vehicle-mounted terminal connected to a vehicle-mounted memory card, in particular to a short-circuit protection device for a vehicle-mounted memory card interface. Background technique [0002] Existing vehicle-mounted terminals generally have external memory cards, especially TF cards, for media playback or map storage. However, during use, the memory card may be pulled out or inserted, or the memory card itself may be damaged, which may cause a short circuit of the power supply at the memory card interface. And because under normal circumstances, the power supply of the memory card interface adopts 3.3V and is powered by the machine, therefore, the short circuit of the power supply caused by the above may directly lead to the failure of the whole machine or damage to other components. [0003] Therefore, if a kind of vehicle-mounted memory card interface short-circuit protection device can be design...

AI Technical Summary

Problems solved by technology

However, during use, the memory card may be pulled out or inserted, or the memory card itself may be damaged, which may cause a short circuit of the power supply at the memory card interface.

In general, the power supply of the memory card interface adopts 3.3V and is powered by the machine. Therefore, the short circuit of the power supply caused by the above may directly lead to the failure of the whole machine or damage to other components.

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