CN201754230U

CN201754230U - Power failure data storage circuit

Info

Publication number: CN201754230U
Application number: CN2010202851867U
Authority: CN
Inventors: 宋斌; 宋成; 潘法成
Original assignee: SHENZHEN CITY SAMKOON TECHNOLOGY Co Ltd
Current assignee: SHENZHEN CITY SAMKOON TECHNOLOGY Co Ltd
Priority date: 2010-08-06
Filing date: 2010-08-06
Publication date: 2011-03-02
Anticipated expiration: 2020-08-06

Abstract

The utility model relates to a power failure data storage circuit, which comprises a single chip microcomputer and a discrete sampling circuit. The discrete sampling circuit comprises a discrete resistor and a filter capacitor. The power failure data storage circuit finishes voltage detection function by aid of a voltage detection circuit of the single chip microcomputer, and can more effectively and reliably store historical data compared to conventional power failure storage circuits.

Description

A kind of power down data are preserved circuit

Technical field

The utility model relates to electronic communication field, more particularly, relates to a kind of power down data and preserves circuit.

Background technology

At present, electronic communication equipment is in the normal course of work after the power down suddenly, effectively the effective way of historical data has following two during preservation work: 1, when CUP normally moves, periodically, save historical data to flash (power down storer) at regular intervals.Do not preserve the storage historical data when 2, CUP normally moves, the moment of power down is utilized the complementary energy of electric capacity to offer the last historical data of CPU execution and holds instruction.The advantage of first method is to need not to change hardware design, only need to finish by software alteration, simple and reliable, shortcoming is that the erasable number of times of (flash) power down storer is restricted, with the K9F1208UOC (flash) of Samsung only 100,000 times, if frequent carries out the serviceable life that erasable operation certainly will be shortened flash to flash, obviously inadvisable for industrial products, second method is feasible, with regard to present most industry control product, all adopt second method, but take the method need increase the change of hardware.

The utility model content

The technical problems to be solved in the utility model is, at the above-mentioned defective of prior art, provides a kind of power down data to preserve circuit.

The technical scheme that its technical matters that solves the utility model adopts is: design a kind of power down data and preserve circuit, described circuit comprises one piece of single-chip microcomputer and discrete sample circuit, and described discrete sample circuit comprises divider resistance and filter capacitor.

More specifically, above-described single-chip microcomputer is the STC12C5202AD series with voltage detecting circuit.

Implement a kind of power down data of the present utility model and preserve circuit, have following beneficial effect:

The voltage detecting circuit that this circuit utilizes single-chip microcomputer itself to have is finished the measuring ability of voltage, need not to increase outside detection means again; Different with like product is, the utility model is in conjunction with concrete product, adopt forward-looking front end voltage detecting circuit, can input voltage fall moment in time signal feedback to central cpu, in the very first time, preferentially finish the preservation task of historical data, preserve circuit with the power down of routine and compare, more effective, more reliable.

Description of drawings

The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:

Fig. 1 is the circuit theory diagrams that a kind of power down data of the utility model are preserved circuit;

Fig. 2 is the circuit block diagram that a kind of power down data of the utility model are preserved circuit.

Embodiment

As depicted in figs. 1 and 2, preserve in the embodiment of circuit in a kind of power down data of the present utility model, described circuit comprises one piece of single-chip microcomputer and discrete sample circuit, described discrete sample circuit comprises two divider resistance R13 (10 kilohms), R12 (600 ohm), filter capacitor C4 (0.1uf).Front end+24V voltage is through the voltage U 0=of two divider resistance post-sampling values (24*R12)/R11+R12)=1.8V, the threshold resetting voltage of single-chip microcomputer is 1.33V, promptly single-chip microcomputer is carried out reset instruction when external input voltage is lower than 16.8V, transmission is that a low level is held instruction to 32 bit CPUs execution power down, thereby effectively saves historical data.

In sum; as those of ordinary skill is scrutable in the art; described in this instructions is a preferred embodiment of the present utility model, and all change or modifications of making according to design of the present utility model all should be in claim protection domain of the present utility model.

Claims

1. power down data are preserved circuit, it is characterized in that described circuit comprises one piece of single-chip microcomputer and discrete sample circuit, and described discrete sample circuit comprises divider resistance and filter capacitor.

2. a kind of power down data according to claim 1 are preserved circuit, it is characterized in that described single-chip microcomputer is the STC12C5202AD series with voltage detecting circuit.