JPH02193209A - Power unit for memory card - Google Patents

Power unit for memory card

Info

Publication number
JPH02193209A
JPH02193209A JP1012924A JP1292489A JPH02193209A JP H02193209 A JPH02193209 A JP H02193209A JP 1012924 A JP1012924 A JP 1012924A JP 1292489 A JP1292489 A JP 1292489A JP H02193209 A JPH02193209 A JP H02193209A
Authority
JP
Japan
Prior art keywords
primary battery
memory
power supply
main primary
voltage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP1012924A
Other languages
Japanese (ja)
Inventor
Masatoshi Kimura
正俊 木村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Priority to JP1012924A priority Critical patent/JPH02193209A/en
Publication of JPH02193209A publication Critical patent/JPH02193209A/en
Pending legal-status Critical Current

Links

Classifications

    • Y02B60/1225

Landscapes

  • Power Sources (AREA)
  • Techniques For Improving Reliability Of Storages (AREA)

Abstract

PURPOSE:To narrow the space of a primary battery used as a power source by setting the voltage given to a memory from an auxiliary primary battery to a value lower than the voltage given to the memory from a main primary battery. CONSTITUTION:The voltage given to a memory 1 from an auxiliary primary battery 22 is set to a value lower than the voltage given to the memory 1 from a main primary battery 21. Consequently, the same function as a conventional power unit using two main primary batteries 21 is given with one main primary battery 21. Thus, the area occupied with the main primary battery 21 is reduced to a half of conventional that, and the packaging surface area of memory cards is extended by this reduction, and the number of memories 1 is increased to increase the memory capacity.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、メモリカードて総称される携帯形半導体メモ
リ装置の電源装置に関するものであり、特に電源として
使用される一次電池のスペースを小さくしたメモリカー
ドの電源装置に関するものである。
[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a power supply device for a portable semiconductor memory device collectively called a memory card. This invention relates to a power supply device for a memory card.

〔従来の技術〕[Conventional technology]

第2図は従来のメモリカード用電源装置を示す。 FIG. 2 shows a conventional memory card power supply device.

同図て、(1)はスタチックRAMのような揮発性半導
体メモリで、(2)はそのアドレスバス、(3)はデー
タバス、(4)はチップイネーブル信号路、(5)は書
込みイネーブル信号路、(6)は出力イネ−ツル信号路
である。(7)は外部電源入力ラインて、タイオード(
8)を経てメモリ(1)の電源端子(9)に接続されて
いる。(10)はメモリ(1)の内部電源装置て、起電
圧E、ボルトの一次電池を2個直列接続してなる主一次
電池(11)と、同しく起電圧E、ボルトの1個の一次
電池からなるメモリ(1)の記憶維持用の補助一次電池
(12)とを含んでいる。主一次電池(11)は限流抵
抗(13)とダイオード(14)とを経てメモリ(1)
の電源端子(9)に接続され、補助一次電池(12)は
同様に限流抵抗(15)とダイオード(16)とを経て
、上記電源端子(9)に接続されている。(17)は主
一次電池(11)の電圧か所定値以下に低下したとき、
これを検出して表示させる信号を取出す電池モニタ信号
路である。
In the figure, (1) is a volatile semiconductor memory such as static RAM, (2) is its address bus, (3) is a data bus, (4) is a chip enable signal path, and (5) is a write enable signal. (6) is the output enable signal path. (7) is the external power input line, and the diode (
8) to the power supply terminal (9) of the memory (1). (10) is the internal power supply device of the memory (1), which consists of a main primary battery (11) consisting of two primary batteries connected in series with an electromotive voltage of E and volts, and one primary battery with an electromotive force of E and volts. It includes an auxiliary primary battery (12) for maintaining memory of the memory (1) consisting of a battery. The main primary battery (11) is connected to the memory (1) via a current limiting resistor (13) and a diode (14).
The auxiliary primary battery (12) is similarly connected to the power supply terminal (9) via a current limiting resistor (15) and a diode (16). (17) is when the voltage of the main primary battery (11) drops below a predetermined value;
This is a battery monitor signal path that detects this and extracts a signal to be displayed.

上記のような従来のメモリカード用電源装置において、
外部電源としては5.主一次電池(II)より高い電圧
の電源が使用される。このため外部電源が使用されると
きはタイオード(8)はオン、ダイオード(14)、(
16)は共にオフて、メモリ(1)は上記外部電源によ
り所要の動作を行なう。外部電源が無いときはダイオー
ド(14)がターンオンし、メモリ(1)は主一次電池
(11)によって記憶データの保持、あるいは記憶デー
タの保持を含む所要の動作を行なう。このとき、図示の
ように限流抵抗(13)とダイオード(14)における
合計の降下電圧をv、、ボルトとすれば、主一次電池(
11)によって電源端子(9)に与えられる電圧は2E
、−V、ボルトである。従って、この場合は補助一次電
池(12)側のダイオード(16)はオフで、該補助一
次電池(12)か放電することはない。
In the conventional memory card power supply device as mentioned above,
5. As an external power supply. A power source with a higher voltage than the main primary battery (II) is used. Therefore, when an external power supply is used, diode (8) is on, diode (14), (
16) are both turned off, and the memory (1) performs the required operations using the external power supply. When there is no external power supply, the diode (14) is turned on, and the memory (1) maintains stored data or performs necessary operations including the retention of stored data by the main primary battery (11). At this time, if the total voltage drop across the current limiting resistor (13) and diode (14) is v, volts as shown, then the main primary battery (
The voltage given to the power supply terminal (9) by 11) is 2E
, -V, in volts. Therefore, in this case, the diode (16) on the auxiliary primary battery (12) side is off, and the auxiliary primary battery (12) is not discharged.

電池モニタ信号路(17)により主−・次電圧(11)
が交換を要する程度に消耗したことが検知されると、2
個の一次電池からなる主一次電池(11)を交換する。
The main and secondary voltages (11) are controlled by the battery monitor signal path (17).
When it is detected that the
The main primary battery (11) consisting of two primary batteries is replaced.

電池の交換中はダイオード(16)がターンオンし、起
電圧E1ボルトの補助一次電池(12)より限流抵抗(
15)およびダイオード(16)を経てメモリ(1)の
電源端子(9)にE、−V2ボルトの電圧が供給される
。メモリ(1)はE 1V zボルトの電圧でも充分に
その記憶を維持するように設計されており、主一次電池
(11)の交換中は上記補助一次電池(12)から供給
される電圧によってメモリ(+)中の記憶データは保持
される。なお、外部電源入力ライン(7)に接続された
ダイオード(8)は、外部電源かないとき、あるいは何
等かの原因で外部電源の電圧か内部電源装置(lO)の
電圧よりも低くなったときオフになって、内部電源装置
(10)から外部電源入力ライン(7)に電流が流れる
のを防止するために挿入されている。
During battery replacement, the diode (16) turns on, and the current limiting resistor (
15) and a diode (16), a voltage of E, -V2 volts is supplied to the power supply terminal (9) of the memory (1). The memory (1) is designed to maintain its memory sufficiently even with a voltage of E1Vz volts, and while the main primary battery (11) is being replaced, the memory is maintained by the voltage supplied from the auxiliary primary battery (12). The stored data in (+) is retained. Note that the diode (8) connected to the external power input line (7) turns off when there is no external power supply or when the voltage of the external power supply becomes lower than the voltage of the internal power supply (lO) for some reason. It is inserted to prevent current from flowing from the internal power supply device (10) to the external power input line (7).

〔発明か解決しようとする課題〕[Invention or problem to be solved]

メモリカードは例えば幅54mm、長さ86mm、厚み
2〜4■程度の非常に薄く小形であるため、上記のよう
な従来のメモリカード用電源装置のように、主一次電池
(11)としてメモリカードの実装面積の中で大きな比
率を占める一次電池を2個も使用することはメモリ(+
)の実装数を下げることになり、メモリカードの大容量
化の大きな妨げになっていた。
A memory card is very thin and small, for example, 54 mm wide, 86 mm long, and 2 to 4 cm thick. The use of two primary batteries, which occupy a large proportion of the mounting area of the memory (+
), which was a major hindrance to increasing the capacity of memory cards.

この発明は、主一次電池の占める面積を小さくしてメモ
リ(1)の実装数を引上げ、メモリカードの大容量化が
可能なメモリカード用電源装置を提供することを目的と
する。
SUMMARY OF THE INVENTION An object of the present invention is to provide a power supply device for a memory card that can increase the capacity of a memory card by reducing the area occupied by the main primary battery and increasing the number of memories (1) mounted.

(課題を解決するための手段) この発明のメモリカード用電源装置においては、1個の
主一次電池と1個の補助一次電池とが使用され、上記補
助一次電池によってメモリに与えられる電圧が上記主一
次電池によって上記メモリに与えられる電圧よりも低く
なるように設定されている。
(Means for Solving the Problems) In the memory card power supply device of the present invention, one main primary battery and one auxiliary primary battery are used, and the voltage applied to the memory by the auxiliary primary battery is The voltage is set to be lower than the voltage applied to the memory by the main primary battery.

〔作用〕[Effect]

外部電源が無いときは、メモリは主一次電池によって記
憶データの保持、あるいは記憶データの保持を含む所要
の動作を行なう。この間は補助一次電池は放電しない。
When there is no external power source, the memory uses the main primary battery to retain stored data or perform necessary operations including retention of stored data. During this time, the auxiliary primary battery will not discharge.

主一次電池が消耗し、これを交換するときは、上記補助
一次電池によりメモリの記憶は維持され、記憶データが
消えることはない。また、主一次電池は1個で済むから
その占有面積は従来の半分になり、その分メモリの実装
数を大きくすることができる。
When the main primary battery becomes exhausted and is replaced, the memory is maintained by the auxiliary primary battery, and the stored data will not be erased. Furthermore, since only one main primary battery is required, the area occupied by it is halved compared to the conventional one, and the number of memories mounted can be increased accordingly.

(実施例) 第1図はこの発明によるメモリカード用電源装置の一実
施例を示し、同図において、(1)は揮発性半導体メモ
リ、(2)はアドレスバス、(3)はデータバス、(4
)はチップイネーブル信号路、(5)は書込みイネーブ
ル信号路、(6)は出力イネーブル信号路、(7)は外
部電源入力ライン、(8)はダイオード、(9)はメモ
リ(1)の電源端子、(10)はメモリ(1)の内部電
源装置、(13)、(15)は限流抵抗、(14)、(
16)はダイオード、(17)は電池モニタ信号路で、
これらは第2図について説明した従来の装置と全く同様
に接続されている。この発明の装置では、内部電源装置
(10)中の主一次電池(21)として、例えば公称起
電圧E1;3ボルトのりチューム電池が1個たけ使用さ
れる。主一次電池(21)が消耗して交換を要するとき
の最終電圧E12を例えば2.5ボルトとすると、補助
一次電池(22)として公称起電圧E2=2.5ボルト
の一次電池な1個使用する。
(Embodiment) FIG. 1 shows an embodiment of the power supply device for a memory card according to the present invention, in which (1) is a volatile semiconductor memory, (2) is an address bus, (3) is a data bus, (4
) is the chip enable signal path, (5) is the write enable signal path, (6) is the output enable signal path, (7) is the external power input line, (8) is the diode, and (9) is the power supply for memory (1). terminals, (10) is the internal power supply of the memory (1), (13), (15) are current limiting resistors, (14), (
16) is a diode, (17) is a battery monitor signal path,
These are connected in exactly the same manner as in the conventional apparatus described in connection with FIG. In the device of the present invention, as the main primary battery (21) in the internal power supply (10), for example, only one 3-volt lithium battery with a nominal electromotive voltage E1 is used. If the final voltage E12 when the main primary battery (21) is exhausted and needs to be replaced is, for example, 2.5 volts, one primary battery with nominal electromotive force E2 = 2.5 volts is used as the auxiliary primary battery (22). do.

上記の電源装置において、外部電源が使用されるときは
タイオード(8)はオン、ダイオード(14)、(16
)はオフて、メモリ(1)は上記外部電源により所要の
動作をする。外部電源か無いときはダイオード(14)
はターンオンし、メモリ(1)は主一次電池(21)か
ら供給される電圧によって記憶データの保持、あるいは
記憶データの保持を含む所要の動作を行なう。このとき
タイオード(16)はオフ状態て補助一次電池(22)
は消耗しない。主一次電池として上記のように公称起電
圧E1=3ボルトのものを使用する場合は、メモリ(1
)は2ボルトで充分に記憶を維持し、実質的に1.5ボ
ルトでも記憶な維持てきるように設計されている。メモ
リ(1)の消費電力は極めて小さいことから、限流抵抗
(13)、(15)の電圧降下は極めて小さく、ダイオ
ード(14)、(16) ノ順方向電圧降下V、′==
0.3ボルトに比して無視することがてきる。よって、
般にV、 共0.3ボルトとしてよい。
In the above power supply device, when an external power source is used, diode (8) is on, and diodes (14) and (16) are on.
) is turned off, and the memory (1) operates as required by the external power supply. Diode (14) if there is no external power supply
is turned on, and the memory (1) retains stored data or performs required operations including retention of stored data by the voltage supplied from the main primary battery (21). At this time, the diode (16) is in the off state and the auxiliary primary battery (22)
is not consumed. When using a main primary battery with a nominal electromotive force E1 = 3 volts as described above, the memory (1
) is designed to maintain memory sufficiently at 2 volts and substantially maintain memory at 1.5 volts. Since the power consumption of the memory (1) is extremely small, the voltage drop across the current limiting resistors (13) and (15) is extremely small, and the forward voltage drop across the diodes (14) and (16) is V,'==
It can be ignored compared to 0.3 volts. Therefore,
In general, V and both may be set to 0.3 volts.

主一次電池(21)の電圧が2.5ボルトまで低下した
ことか電池モニタ信号路(17)によって検知されると
、主一次電池(21)を交換する。このときダイオード
(16)はターンオンし、メモリ(1)の電源端子(9
)には補助一次電池(22)よりE2 (2,5ボルト
)−VZ(約0.3ボルト)=2.2ボルトの電圧が供
給され、メモリ(1)は充分にその記憶を維持して記憶
データを保持することかできる。
When the battery monitor signal path (17) detects that the voltage of the main primary battery (21) has dropped to 2.5 volts, the main primary battery (21) is replaced. At this time, the diode (16) turns on and the power supply terminal (9) of the memory (1)
) is supplied with a voltage of E2 (2.5 volts) - VZ (approximately 0.3 volts) = 2.2 volts from the auxiliary primary battery (22), and the memory (1) maintains its memory sufficiently. It is possible to retain stored data.

なお、補助一次電池(22)はその用途上永久組込み式
とされるが、この補助一次電池についても交換可能にし
てもよい。
Although the auxiliary primary battery (22) is of a permanently built-in type due to its intended use, this auxiliary primary battery may also be made replaceable.

上記の実施例ては、主一次電池(21)として補助一次
電池(Z2)よりも高い起電圧のものを使用したが、主
一次電池(21)、補助一次電池(22)として同じ起
電圧のものを使用し、限流抵抗(13)として限流抵抗
(15)より小さな値のものを使用してもよい。
In the above embodiment, the main primary battery (21) used was one with a higher electromotive voltage than the auxiliary primary battery (Z2), but the main primary battery (21) and the auxiliary primary battery (22) had the same electromotive voltage. The current limiting resistor (13) may have a smaller value than the current limiting resistor (15).

(効果) この発明によれば、補助一次電池(22)によってメモ
リ(1)に与えられる電圧が主一次電池(21)によっ
てメモリ(1)に与えられる電圧よりも低くなるように
することにより、1個の主一次電池で2個の主一次電池
を使用した従来の電源装置と同し機能をもたせることが
できる。従って、主一次電池の占める面積か従来の半分
ですみ、その分メモリカードの実装面積を大きくして、
内部半導体メモリの数を増してメモリ容量を大きくする
ことができる。
(Effects) According to the present invention, by making the voltage applied to the memory (1) by the auxiliary primary battery (22) lower than the voltage applied to the memory (1) by the main primary battery (21), One main primary battery can provide the same functionality as a conventional power supply device using two main primary batteries. Therefore, the area occupied by the main primary battery is only half that of the conventional one, and the mounting area of the memory card is increased accordingly.
The memory capacity can be increased by increasing the number of internal semiconductor memories.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図はこの発明によるメモリカード用電源装置の一実
施例を示す図、第2図は従来のメモリカード用電源装置
の一例を示す図である。 図において、(10)・・・・内部電源装置、(1)・
・・メモリ、(21)・・・・主一次電池、(22)・
・・・補助一次電池。
FIG. 1 is a diagram showing an embodiment of a memory card power supply device according to the present invention, and FIG. 2 is a diagram showing an example of a conventional memory card power supply device. In the figure, (10)...internal power supply device, (1)...
・・Memory, (21)・・・Main primary battery, (22)・
...Auxiliary primary battery.

Claims (1)

【特許請求の範囲】[Claims] (1)メモリカードの内部電源として1個の主一次電池
と1個の補助一次電池とを使用し、上記補助一次電池に
よって上記メモリカードのメモリに与えられる電圧が上
記主一次電池によって上記メモリに与えられる電圧より
も低くなるように設定したことを特徴とするメモリカー
ド用電源装置。
(1) One main primary battery and one auxiliary primary battery are used as the internal power source of the memory card, and the voltage applied to the memory of the memory card by the auxiliary primary battery is applied to the memory by the main primary battery. A power supply device for a memory card, characterized in that the voltage is set to be lower than the applied voltage.
JP1012924A 1989-01-20 1989-01-20 Power unit for memory card Pending JPH02193209A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1012924A JPH02193209A (en) 1989-01-20 1989-01-20 Power unit for memory card

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1012924A JPH02193209A (en) 1989-01-20 1989-01-20 Power unit for memory card

Publications (1)

Publication Number Publication Date
JPH02193209A true JPH02193209A (en) 1990-07-30

Family

ID=11818884

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1012924A Pending JPH02193209A (en) 1989-01-20 1989-01-20 Power unit for memory card

Country Status (1)

Country Link
JP (1) JPH02193209A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02195415A (en) * 1989-01-24 1990-08-02 Matsushita Electric Ind Co Ltd Memory card

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02195415A (en) * 1989-01-24 1990-08-02 Matsushita Electric Ind Co Ltd Memory card

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