CN102592105A

CN102592105A - Low power consumption design method based on close-range wireless communication

Info

Publication number: CN102592105A
Application number: CN2011100096053A
Authority: CN
Inventors: 薛重阳
Original assignee: Shanghai Huahong Integrated Circuit Co Ltd
Current assignee: Shanghai Huahong Integrated Circuit Co Ltd
Priority date: 2011-01-17
Filing date: 2011-01-17
Publication date: 2012-07-18

Abstract

A low power consumption design method based on close-range wireless communication adopts the combination of a low power consumption access mode and a wakeup mechanism, and the realization manner of a system clock is closed when a system interface has no data interaction. Particularly, the method includes the steps as follows: an SWP (single wire protocol) low power consumption mode signal is generated when an SWP interface gets into a pause state, a system is informed that the SWP interface has no data interaction, the related clock of the system is closed, and the system gets into a low power consumption mode; and when data transmission occurs, a CLF (contactless front-end) sends out a carrier signal, a wakeup signal is generated at once when the carrier is detected, the SWP low power consumption mode signal is eliminated, the system quits the low power consumption mode, the clock recovers, and the SWP interface recovers to an activation state for performing normal data transceiving. Through control on different modes and the system clock, the method can effectively lower the system power consumption.

Description

A kind of low power consumption design method based on wireless near field communication

Technical field

The present invention relates to a kind of low power consumption design method, relate in particular to a kind of low power consumption design method based on wireless near field communication.

Background technology

In recent years, along with the appearance of application such as mobile phone small payment, wireless near field communication (NFC) technology has obtained developing rapidly.SWP (single-wire-protocol) is the interface that is used for connecting CLF (Contactless Front-end remote control front end) chip and the use of NFC-SIM the core of the card sheet during wireless near field communication (NFC) is used.SWP is the solution that has future prospect during present NFC uses most, is widely accepted in fields such as mobile phone admission ticket and small amount payments and adopts.

NFC is a kind of wireless communication technology, with existing contactless smart card technical compatibility, has become the official standard that more and more manufacturers support.NFC is still a kind of short-range communication secret communication mode simultaneously, provides between various device easily, safety, communication rapidly and automatically.It has combined non-contact inductive and wireless connect technology, acts on the 13.56MHz frequency band, and transmission range only is about 10 centimeters, and transmission speed is second 106kbit/ second～424kbit/ at present.It not only meets ISO 18092, ISO 21481, ECMA (340,352 and 356) and ETSI TS 102190 standards; But also compatible with the contactless smart card infrastructure device that adopts ISO/IEC 14443Type A, Type B standard, therefore becoming in recent years, mobile phone provides mobile payment, service to receive the best solution of service.Compare with other short-distance wireless communication technology, therefore quick the and tool security of NFC transaction is suitable as the stored value card technology under the wireless transmission environment very much.

Battery capacity is limited for small type mobile devices, and the stand-by power consumption of chip has bigger influence service time for mobile device.The design of adopting the design of low-power consumption and not adopting low-power consumption is for evident difference is arranged service time of mobile device.How can in wireless near field communication is used, design a kind of reduction power consumption technology, the average power consumption that reduces chip is a technical matters to be solved by this invention.

Summary of the invention

The object of the invention provides a kind of low power consumption design method based on wireless near field communication, adopts low-power consumption to get into combining of pattern and arouse machine processed, and shutdown system clock when the system interface no datat is mutual reaches the purpose of effective reduction system power dissipation.

A kind of low power consumption design method based on wireless near field communication comprises following content:

Produce the SWP power down signal when SWP interface gets into halted state, reporting system SWP interface no datat is mutual, and the corresponding clock of shutdown system gets into low-power consumption mode.

When data transmission occurred, remote control front end CLF sent carrier signal, produced wake-up signal at once after detecting carrier wave; Remove SWP low-power consumption mode signal, system withdraws from low-power consumption mode, recovered clock; The SWP interface returns to state of activation, carries out normal data transmit-receive.

Description of drawings

Fig. 1 is based on wireless near field communication system signal communication scheme

Fig. 2 is based on the low power consumption design method basic flow sheet of wireless near field communication

Embodiment

Below in conjunction with each accompanying drawing summary of the invention provided by the invention being carried out detailed description, is embodiment with the intelligent SIM the core of the card sheet of integrated SWP interface:

The standard contacts that traditional intelligence SIM Chip Packaging is come out has 8, and the 6th contact wherein is not used.In the NFC-SIM chip design, utilize this contact to realize the SWP interface protocol, thus with the remote control front end CLF chip communication interaction data in the external world.

Single S WP interface, the relation between its low-power consumption indicator signal, wake-up signal and current state and the S1 are only passed through in the data connection that has indicated among Fig. 1 between CLF chip and the NFC-SIM chip.When being halted state, produce the low-power consumption indicator signal; When carrier wave occurring, generate wake-up signal and withdraw from low-power consumption mode.

Provided the basic flow sheet of low power consumption design method of the present invention among Fig. 2, it is embodied as: when the SWP interface was in halted state, the SWP interface had no data interaction.When the SWP interface gets into halted state, produce the SWP power down signal, reporting system SWP interface no datat is mutual, and the relevant clock of shutdown system, gets into low-power consumption mode.When data transmission, CLF sends carrier wave.System produces wake-up signal after detecting carrier wave at once, removes the SWP power down signal, makes system withdraw from low-power consumption mode, and recovered clock.Thereby the SWP interface returns to state of activation again, normally transceive data.Adopt above-mentioned embodiment, the power consumption in the effectively reduction system guarantees normal operation circuit.

Claims

1. low power consumption design method based on wireless near field communication is characterized in that comprising following content:

The SWP interface get into halted state the time produce the SWP power down signal, reporting system SWP interface no datat is mutual, the corresponding clock of shutdown system gets into low-power consumption mode;

When data transmission occurred, remote control front end CLF sent carrier signal, produced wake-up signal after detecting carrier wave; Remove SWP low-power consumption mode signal, system withdraws from low-power consumption mode, recovered clock; The SWP interface returns to state of activation, carries out normal data transmit-receive.

2. a kind of low power consumption design method based on wireless near field communication as claimed in claim 1 is characterized in that said SWP interface is the single-wire-protocol interface in the wireless near field communication.