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Power-on system construction applicable to multiple power system smart cards

A smart card chip and electrical system technology, applied in electrical components, electronic switches, pulse technology, etc., can solve the problems of unstable power-on reset, system error, and error output, etc.

Active Publication Date: 2008-12-31
BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the actual situation, it may happen that some circuits are not stable when the reset is completed, or the power-on reset is incorrectly output due to the influence of the power supply, etc., which eventually leads to system errors.

Method used

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  • Power-on system construction applicable to multiple power system smart cards
  • Power-on system construction applicable to multiple power system smart cards

Examples

Experimental program
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Embodiment Construction

[0021] Such as figure 1 As shown, except for the core circuit in the dotted line box, other circuits constitute the power-on system structure of the multi-power system smart card chip proposed by the present invention. This example is implemented in an integrated circuit of CMOS process, the external power supply VCC is 5 volts, and VCC starts to rise from 0 volts during power-on and finally stabilizes to 5 volts.

[0022] The whole structure includes: a reference circuit with voltage detection, a voltage stabilization circuit, two delay circuits, and a core power supply voltage detection circuit; the power supply of the reference circuit, voltage stabilization circuit, and delay circuit is an external power supply, and the reference voltage output terminal of the reference circuit is provided to The reference voltage input terminal of the voltage stabilizing circuit, the reference voltage detection output terminal of the reference circuit is connected to the input of the dela...

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Abstract

The invention relates to an electrifying system structure applied to a smart card chip with multi power systems. Circuits with the multi power systems in the chip system are controlled by the structure according to the principle of gradual stabilizing, namely gradual enabling from the electrifying of an external power source, and a subsequent level circuit module is started to work only after the work of a former level circuit module is stable. By the structure, the orderly electrifying and the reliable and stable starting of the internal circuit modules of the smart card can be ensured during electrifying.

Description

technical field [0001] The present invention is a power-up system structure applied to smart card chips of multiple power supply systems. Background technique [0002] With the advancement of integrated circuit technology, the power supply voltage of the core circuit in the smart card is gradually reduced, while the external power supply voltage of the smart card specification is still maintained at 5V, so there are multiple power supply systems in the smart card. The startup of multiple power systems during power-on will affect the stability and reliability of the entire chip system. The stable startup and normal operation of the chip system can be guaranteed by effectively controlling the normal startup of each power system circuit when power is turned on. [0003] When there are two or more power supplies in the smart card chip, each power supply system will start to work one after another when starting up, and the modules under each power supply system will also start. ...

Claims

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Application Information

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IPC IPC(8): H03K17/22
Inventor 马纪丰周建锁
Owner BEIJING CEC HUADA ELECTRONIC DESIGN CO LTD
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