Method for inspecting type of connected peripheral apparatus and terminal interface
A technology for detecting interfaces and terminal interfaces. It is used in instruments, electrical digital data processing, etc., and can solve the problems of burned out circuits, insufficient interface resources, and adverse effects of circuits, and achieves the effect of reducing occupancy.
Active Publication Date: 2009-06-03
HUAWEI TECH CO LTD
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Problems solved by technology
[0005] Using the solution provided by the existing technology, an interface can only recognize two different peripherals. When there are many types of peripherals, the interface resources will not be enough; and in normal use, although the solution provided by the prior art can be easily Good identification of the charger and earphones, but when the charger is not powered on, because the power management chip does not detect any voltage input, it will think that the earphones are plugged in, and thus turn on the earphone control circuit. If the charger is plugged in at this time Turning on the power will bring adverse effects to the circuit, and may burn the circuit seriously
Method used
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no. 1 example
[0025] see figure 1 , the first embodiment of the inventive method mainly comprises:
[0026] Step 101, pull up the detection pin on the inserted peripheral interface to the pull-up power supply through a pull-up resistor, and connect the detection pin to the detection interface placed in a high-impedance state through a first resistor;
[0027] Doing the above processing on the detection pin can generate different signals according to different types of peripherals, because the circuit structures of different types of peripherals are different; the structure of the first embodiment of the terminal interface provided by the present invention is as follows: figure 2 Shown:
[0028] The terminal interface adopts the small USB (mini USB) interface standard, mainly including detection pins, ground pins and function pins, and the number of function pins varies according to the standards adopted by the terminal interface. For example, when using the mini USB interface standard , ...
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A method for detecting out type of inserted external device includes connecting detection pin to detection interface, detecting level high or low of detection pin, controlling level of detection interface and level of detection pin to confirm that external device is the first external device with detection pin suspension and external device is the second external device with detection pin being ground through the third resistance as well as external device is the third external device with detection pin being directly grounded in order to use one interface to identify three types of different external devices.
Description
technical field [0001] The invention relates to terminal technology, in particular to a method for detecting the type of an inserted peripheral and a terminal interface. Background technique [0002] As the functions of terminal devices such as mobile phones become more and more abundant, more and more peripherals are required. For example, the most commonly used peripherals for mobile phones are chargers, USB (Universal Serial Bus, Universal Serial Bus) and earphones, etc. , due to the lack of available interface resources of terminal equipment such as mobile phones, the increase of peripherals may lead to insufficient interface resources, and one interface for each peripheral will also cause waste of circuits and increase costs. [0003] Therefore, in order to make full use of the circuit and reduce costs, a common interface solution is generally adopted for multiple peripherals, thereby reducing the interface resources that a unit of peripherals need to occupy and reducin...
Claims
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IPC IPC(8): G06F13/40
Inventor 彭祥敏利冠华
Owner HUAWEI TECH CO LTD