JP2865114B2 - Memory card system status checker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for confirming whether or not a memory card has been inserted and a state of consumption of a backup battery of a memory card in a system using a memory card as external auxiliary storage means.

[0002]

2. Description of the Related Art In recent years, in a material testing machine, various analytical instruments, measuring instruments, and the like, data or programs such as complicated test conditions and valuable test results and analysis results over a wide range of items are stored as external auxiliary storage means. It is often stored and stored on a memory card. In a system using such a memory card, whether or not the memory card is inserted is visually checked by the operator himself. Not proposed.

[0003]

However, it is troublesome for an operator to visually check the presence or absence of a memory card each time, and the consumption state of the backup battery cannot be easily grasped. Unexpected situations such as loss of data were sometimes caused by the consumption of the battery.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a memory card system state checking device capable of easily checking the presence or absence of a memory card and the consumption state of a backup battery. It is intended to provide.

[0005]

The present invention has the following configuration to achieve the above object. That is, the state checking device of the memory card system according to the present invention compares the voltage of the memory card backup battery and the reference voltage with the memory card attachment detecting means for electrically detecting the presence or absence of the memory card. The comparison means for detecting the normality / abnormality of the battery for backup and the output of the memory card attachment detection means and the comparison means. Is provided with a notifying means for notifying whether the backup battery is abnormal or the memory card is inserted and the backup battery is normal by a combination of a plurality of signs corresponding to each.

[0006]

The operation of the present invention is as follows. That is, the memory card insertion detecting means electrically detects the presence or absence of the memory card, and the comparing means detects the consumption state of the backup battery by comparing the voltage of the backup battery with the comparison voltage. . The notifying unit may determine whether the memory card is not inserted, whether the memory card is inserted but the backup battery is abnormal, or whether the memory card is abnormal, based on the outputs of the memory card insertion detecting unit and the comparing unit. , And whether the backup battery is normal is notified by a combination of a plurality of indications corresponding to each.

[0007]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing a schematic configuration of the state checking device of the memory card system according to the present embodiment.

In FIG. 1, reference numeral 1 denotes a memory card, and reference numeral 2 denotes an input / output interface on which the memory card 1 is mounted, for example, a material testing machine or various measuring devices. Memory card 1
Are a memory 3 composed of a CMOS static RAM or the like, a backup battery 4 of the memory 3, a backflow prevention diode D ₁ and a resistor R ₁ connected in series between the backup battery 4 and the memory 3. In addition, a data bus, an address bus, a control bus and the like connected to the memory 3 are included. T _{1 to} T ₅ are terminals for connecting the memory card 1 and the interface 2.

The interface 2 includes a bias die.
Aether D_TwoAnd the normal voltage of the backup battery 4
Diode that generates a reference voltage determined as
D_Three , Comparator 5, AND gates 6, 7 and green light
Photodiode LED₁And red light emitting diode LED
₁And the resistance R_Two~ R_Fiveincluding.

When the power of the interface 2 is turned off while the memory card 1 is connected, V _cc and V _ee become low impedance, and the backup battery is consumed. Accordingly, the diode D ₄ to prevent this contains as for preventing back flow.

Hereinafter, the operation of the apparatus of the present embodiment will be described as follows: (A) when the memory card 1 is not inserted, (B) when the memory card 1 is inserted, but when the backup battery 4 is exhausted. (C) A case where the memory card 1 is inserted and the backup battery 4 is normal will be described separately.

(A) When the memory card 1 is not mounted In this case, the terminal T ₃ is baked to 0 V by the diode D ₂ , so that one input voltage V _B of the comparator 5 becomes 0
V. Further, as the other reference voltage V _R of the comparator 5, the voltage made by the Zener diode D ₃ is entered. Comparator 5, when the input voltage V _B is lower than the reference voltage V _R, and outputs the "H" inactive. Accordingly, the output of the AND gate 6 becomes "H" in the inactive state, the light emitting diode LED ₁ is turned off.

At this time, since the terminal T ₂ is pulled up by the resistor R ₃ , one input of the AND gate 7 becomes inactive. As a result, the AND gate 7 becomes “H” in an inactive state, and the light emitting diode LED ₂ also goes out.

As described above, when the memory card 1 is not inserted, both the light emitting diodes LED ₁ and LED ₂ are turned off.

[0015] (B) Although the memory card 1 is attached, when the case where backup battery 4 is exhausted, the input voltage V _B of the comparator 5 becomes a voltage of the backup battery 4, a backup since the battery 4 is exhausted, the input voltage V _B becomes lower than the reference voltage V _R, the comparator 5 outputs the "H" inactive.
As a result, since the output of the AND gate 6 becomes "H" in the inactive state, the light emitting diode LED ₁ is turned off.

On the other hand, although the terminal T ₂ is pulled up by the resistor R ₃ , the terminal T ₂ is connected to the ground line V _ee by the internal connection of the inserted memory card 1 and becomes “L” level. As a result, one input of the AND gate 7 becomes active. Also, since the “H” level is input from the comparator 5 as the other input of the AND gate 7, the comparator 5 outputs “L” in the active state. Therefore,
Emitting diode LED ₂ is lit red.

As described above, when the memory card 1 is inserted but the backup battery 4 is exhausted,
Light emitting diode LED ₁ is off, light emitting diode LED
₂ lights up.

[0018] (C) the memory card 1 is attached, and in this case if the backup battery 4 is normal, the input voltage V _B of the comparator 5 becomes higher than the reference voltage V _R, the comparator 5 is active The state "L" is output. At this time, since the terminal T ₂ is at the “L” level, when both inputs of the AND gate 6 become active, the AND gate 6 outputs “L” in the active state. As a result, the light emitting diode LED ₁ is lit in green.

When the output of the comparator 5 becomes "L" level, one input of the AND gate 7 becomes inactive, so that the AND gate 7 outputs "H" in an inactive state. As a result, the light emitting diode LED ₂
Turns off.

[0020] As described above, are attached memory card 1, and if the backup battery 4 is normal, the light emitting diode LED ₁ is lit, the light emitting diode LED ₂ is turned off.

In the embodiment described above, the light emitting diodes LED ₁ , LED ₁ ,
By turning on or off the LED ₂ , the presence / absence of the memory card 1 and the normal / consumed use of the backup battery 4 are displayed, but this may also be notified by sounding a buzzer or the like. Good.

Also, the outputs of the AND gates 6 and 7 are taken into a CPU (not shown) connected to the interface 2 to determine whether or not the memory card 1 is mounted and whether the backup battery 4 is normal or abnormal. The status may be displayed on various displays such as.

[0023]

As is apparent from the above description, according to the present invention, the presence / absence of the memory card and the consumption state of the backup battery are automatically detected and notified. The trouble of the operator visually confirming whether or not the memory card is inserted can be avoided, and the operator can easily know whether the backup battery is normal or abnormal. The situation can be prevented beforehand.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing a schematic configuration of an embodiment of a state checking device of a memory card system according to the present invention.

[Explanation of symbols]

1 ... battery memory card 2 ... Interface 3 ... memory 4 ... Backup 5 ... comparator 6, 7 ... the AND gate D _1, D ₂ ... diode D ₃ ... Zener diode D ₄ ... diodes R ₁ to R ₅ ... resistance LED ₁ , LED ₂ ... light emitting diode

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G06K 17/00 G06F 1 / 18,1 / 28

Claims (1)

(57) [Claims] 1. A normal / abnormal detection of a backup battery by comparing a voltage of a backup battery of the memory card with a reference voltage and a memory card insertion detecting means for electrically detecting whether or not a memory card is inserted. Based on each output of the memory card insertion detecting means and the comparing means, whether the memory card is not inserted, whether the memory card is inserted but the backup battery is abnormal, A status checking device for a memory card system, comprising: a notifying unit for notifying whether a card is mounted and a backup battery is in a normal state by a combination of a plurality of indications corresponding to the respective statuses.