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A working frequency adjustment method and circuit for a non-contact card chip

A technology of working frequency and non-contact card, which is applied in the direction of record carrier, instrument, computer parts, etc. used by the machine, to achieve the effect of speed and reliability

Active Publication Date: 2016-09-14
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for adjusting the operating frequency of a non-contact card chip. The purpose is to solve the problem that the chip can work reliably at the highest operating frequency under a certain field strength. power, to give a reference for the processing of the operating frequency

Method used

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  • A working frequency adjustment method and circuit for a non-contact card chip
  • A working frequency adjustment method and circuit for a non-contact card chip
  • A working frequency adjustment method and circuit for a non-contact card chip

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Embodiment Construction

[0016] The operating frequency adjustment circuit for the contactless card chip includes a power supply voltage detection circuit, a discharge current detection circuit, and a chip clock selection circuit, wherein:

[0017] exist figure 2 The operating frequency adjustment circuit for the contactless card chip shown in , is composed of a power supply voltage detection circuit, a discharge current detection circuit (8) and a chip clock selection circuit (9).

[0018] The discharge current detection circuit monitors the excess current released by the chip, and each bit of the output (ID_OUT[n:1]) represents a certain current value. ID_OUT[i]='1' means that the discharge current is greater than I i , I i designed for the chip to operate at frequency f i lower current consumption, and the I 1 2 n .

[0019] The power supply voltage detection circuit monitors the chip power supply voltage. When the power supply voltage is higher than the detection threshold, the output (VD_OUT...

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PUM

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Abstract

In order to obtain a fast transaction velocity, a contactless card chip is usually expected to work with a high clock frequency. However, the maximum power obtained by the contactless card chip under different field intensity is different. The larger the field intensity, the larger the maximum power obtained by the chip is, and the higher the working efficiency supported by the chip is. Therefore, the working efficiency of the contactless card chip needs to be selected according to the field intensity. The invention provides a method for selecting the working efficiency of the chip according to discharging current and supply voltage of the chip, the chip is guaranteed to work with a high frequency as far as possible, and chip reset caused by increase of the working efficiency and repeated increase and decrease of the working frequency can be avoided.

Description

technical field [0001] The present invention relates to a working frequency adjusting method, more specifically, the present invention relates to a working frequency adjusting method for a non-contact card chip. Background technique [0002] The continuous development of contactless card applications puts forward higher and higher performance requirements for contactless card chips. The chip needs to continuously improve the processing speed, and at the same time, it needs to be able to work under the smallest possible field strength. Chips usually increase the processing speed by increasing the clock frequency of the CPU, but increasing the frequency means more power consumption, which is obviously not possible under a smaller field strength. Therefore, it is necessary to evaluate the energy situation of the chip under the current working field strength, and provide a reference for the processing of the working frequency, so as to realize the fastest and reliable work under...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K19/077
Inventor 刘晓艳马哲王延斌王小宁张建平
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD