|
|
-
January 20th, 2019, 12:11 PM
#1
Mitsubishi SRAM Melcard query
Hi,
I've just fitted a new battery (lithium 3V, 2325 size) to my 2MB SRAM Melcard (PCMCIA card), which is working fine. Recognised by XP laptop, can format (FAT) and save and read files.
On the back of the card is a space to write a 'Battery Expiration' date, but I have no idea how long a new battery should last. I can't find a manual (Bitsavers just has a massive slide pack on RAM / ROM products).
Has anyone got a manual please or any experience on battery life?
Thanks,
John
-
January 20th, 2019, 03:48 PM
#2
A lithium "keep alive" battery should be good for at least 5-7 years.
-
January 22nd, 2019, 09:08 AM
#3
Thanks. I found this on: https://web.archive.org/web/20010429...dukte/sram.htm
Very low current consumption: 0.1 mA - 0.3 mA standby current / 1.4 µA - 17 µA battery back up current
and a list of card sizes from 256KB to 4MB
So assume:
4MB = 17uA
256kB=1.4uA
gives approx:
2MB = 8.5uA
1MB = 4.3uA to 5.6uA
512kB=2.8uA
So can then estimate life based on mAhr rating of the coin cell used.
Regards,
John
-
January 22nd, 2019, 12:58 PM
#4
Found the datasheets for a range of MELCARDs including my one:
http://pdf1.alldatasheet.com/datashe...7-J8CATXX.html
Some use 2025 battery and some (like mine) 2325 battery. Standby battery life varies between 1 and 6 years depending on model, so I might as well leave the battery out as I really don't need to keep the data on the card for more than a few days (eg to transfer files to / from a PC).
Regards,
John
Posting Permissions
- You may not post new threads
- You may not post replies
- You may not post attachments
- You may not edit your posts
-
Forum Rules
Bookmarks