System on chip supporting SIM card function and method for realizing SIM card function

Abstract

The invention discloses a system on chip supporting an SIM card function and a method for realizing the SIM card function. The system on chip includes an SIM card VCC detection circuit, an SIM card reset processing circuit, an SIM card clock frequency detection circuit, an SIM card serial data receiving / transmitting circuit, a programmable circuit and a central processing unit (CPU). The system on chip of the invention can not only support an original SIM card function, but can also realize function extension. Compared with an original SIM card, a physical space can be saved, the layout area of a product can be further reduced, the miniaturization of the product can be benefitted; the SIM card function is realized through a non-physical manner; troubles such as poor contact, high possibility of being damaged, card replacement and card change can be avoided; the adaptability of the product can be improved; and requirements of the application of meters in the water conservancy industry, the electric power industry and the like to complex environments such as high-humidity, high-temperature and windy and dusty environments can be satisfied.

Description

technical field [0001] The invention relates to the technical field of mobile communication, in particular to a system-level chip supporting the function of a SIM card and a method for realizing the function of the SIM card. Background technique [0002] SIM card is the abbreviation of (Subscriber Identity Module customer identification module), also known as subscriber identity card, smart card, GSM digital mobile phone must be equipped with this card before it can be used. The information of the digital mobile phone customer, the encrypted key and the user's phone book are stored on the SIM chip, which can be used to identify the identity of the GSM network customer and encrypt the voice information of the customer during the call. figure 1 For common SIM cards (large / small) [0003] At present, the SIM card on the market exists as a separate device. As a part of the mobile communication system terminal, the size of the device will be greatly limited. For mobile terminal...

AI Technical Summary

Problems solved by technology

[0004] With the rise of wearable and Internet of Things products, the market demand for product miniaturization is becoming stronger and stronger. The current independent SIM card will face large size, poor contact, easy damage, and inconvenient replacement of the SIM card when it is actually used. , high cost and other issues, the current form of the SIM card restricts the development of the Internet of Things and wearable products to a certain extent

[0005] In addition, the current function of the SIM card is single, and operators cannot expand the function on this basis. There are currently two ways to realize the function of the SIM card. One is to purchase wafers from SIM card chip manufacturers, and then combine the wafers with Customer self-developed chips are packaged into a chip; another method is to purchase the IP of the SIM card and then integrate it into its own chip

[0006] Using the method of outsourcing SIM card wafers increases the cost of outsourcing wafers, and the packaging of the chip is also more complicated; using the method of outsourcing SIM card IP increases the cost of outsourcing IP and increases the area of ​​additional silicon wafers

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