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A conversion circuit between spi and iso7816

An ISO7816, conversion circuit technology, applied in the direction of electrical components, transmission systems, etc., can solve problems such as SAM dysfunction, achieve the effects of increasing stability, improving work performance, and reducing production costs

Active Publication Date: 2021-04-23
广州佳都数据服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The SAM card follows the ISO7816 standard protocol. At present, many processors, such as Freescale, TI, and Samsung, rarely have a SAM interface, which brings obstacles to the development of SAM functions in smart terminals.

Method used

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  • A conversion circuit between spi and iso7816
  • A conversion circuit between spi and iso7816
  • A conversion circuit between spi and iso7816

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Embodiment Construction

[0021] Embodiments of the present invention are described in detail below, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions.

[0022] In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0023] It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanyi...

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Abstract

The present invention proposes an SPI and ISO7816 conversion circuit, which uses the SPI bus to convert the ISO7816 to realize the control of the smart card, including a smart terminal CPU module, an SPI-to-serial SC16IS752 circuit, a SN74AHC157 serial-to-ISO7816 circuit, and a smart SAM card module. SPI controls SC16IS752 to serial port protocol at a rate of up to 5Mbit / s, and the RTS pin of SC16IS752 is connected to SN74AHC157 to control the switching of serial ports. After a large number of tests, the circuit has good compatibility with various types of SAM cards, and the switching between sending and receiving is free and stable. The invention uses the common SPI port for SAM control, which solves the problem that most CPUs cannot control the SAM without the SAM interface.

Description

technical field [0001] The invention relates to the field of electronic circuits, in particular to an SPI and ISO7816 conversion circuit. Background technique [0002] With the progress of the times and the development of smart technology, cashless payment can be seen everywhere in life. The security of cashless transactions has become more important than ever. Currently, the main way to ensure transaction security is encryption. There are many encryption methods, one of which is the use of SAM cards. This method is more common in POS, smart deduction terminal etc. The SAM card follows the ISO7816 standard protocol. At present, many processors, such as Freescale, TI, and Samsung, rarely have a SAM interface, which brings obstacles to the development of SAM functions in smart terminals. Contents of the invention [0003] In view of the above problems, the present invention provides a conversion circuit between SPI and ISO7816, which provides a solution for the CPU without...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/06
CPCH04L69/08
Inventor 赖章勇谭宁向锡坚周剑
Owner 广州佳都数据服务有限公司