MF3129-J8CATXX 데이터 시트보기 (PDF) - MITSUBISHI ELECTRIC

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MF3129-J8CATXX

8/16-bit Data Bus Static RAM Card

MITSUBISHI ELECTRIC  

MITSUBISHI MEMORY CARD

STATIC RAM CARDS

21.2 REPLACING BATTERY

MF3XXX-J8CATXX series have two batteries inside the card as follows.

Lithium battery; for main battery (replaceable)

Rechargeable battery; for auxiliary battery (not replaceable)

For main battery replacement, perform the following procedure. Performing any other procedures will lose the

data recorded in the IC card.

(1)Have on hand a new main battery that has the same model number as or is equivalent currently installed one.

(2)Insert the IC card into the system and apply power to the IC card so that the auxiliary battery will be charged.

(more than 5 minutes)

(3)While pressing the main battery holder cam release levers inward, slowly withdraw the main battery holder.

(4)With the new main battery set in the battery holder, insert it completely into the IC card.

(5)If the battery holder is incorrectly oriented, it will not smoothly fit into its position or the IC card will bulge.

If such a situation is encountered, properly reorient the battery and battery holder and try again.

(6)Insert the battery holder until it clicks into position.

<NOTICE>

Main battery replacement must be completed quickly (recommended time is within 10 minutes).

If too much time is taken, the recorded data may be lost.

The built-in auxiliary battery cannot be replaced.

22. CONNECTOR

The number of card insertion and removal are as follows.

Office environment

10000 times min. at speed of 10 cycles/min.

Harsh environment

5000 times min. at speed of 10 cycles/min.

23. CARD WEIGHT about 35g

24. UL CLASS OF MAIN CARD PARTS

(1)MAIN FRAME

(2)PCB

(3)PLASTIC PART OF CONNECTOR

UL94V-0

UL94V-0

UL94V-0

25. THE BATTERY VOLTAGE DETECT SIGNALS (BVD1,2)

BVD1 BVD2

Comment

H

H Battery operational

H

L Battery operational, but battery should be replaced

L

L Battery and data integrity is not kept

Note11. The battery voltage detect signals indicate the present state of the battery.

They do not guarantee the data retention.

26.CONCERNING THE SECURITY OF DATA

There is always the possibility that a soft-error (this malfunction is not permanent hence it is called soft and

the data can be restored by rewriting) may occur with semiconductor products.

When keeping the important data within an IC card, remember to give due consideration to safety when

making your circuit designs, with appropriate measures such as

(1) Keeping multiple copies of the data.

(2) Addition of ECC or CRC by software or hardware.

MITSUBISHI

ELECTRIC

14/16

Apr. 1999 Rev. 1.2

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