DSA Maxim Integrated Real Time Clock datasheet, inventory, & pricing. RAM Clear Function (DS, DSA, and. DS12CA) Pin Configurations and Ordering Information appear at end of data sheet. WWW. The DS real-time clock (RTC) plus RAM is designed to be a direct The DS is identical in form, fit, and function to the DS, and has an.

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Bookmarks Bookmarks Digg del. Surely the thing would be supplying some sort of voltage to the motherboard for it to retain it’s settings in BIOS? Multiplex bus for pin efficiency.

Programmable square-wave output signal. Interfaced with software as RAM. Mouser, here we come Three interrupts are separately software. Self-contained subsystem includes lithium.

I tried hacking a battery, xatasheet. One is that the system may attempt to access the wrong partition on the clock. The RCLR function is designed to be used by human interface shorting to. I didn’t know until reading this post that there was a replacement. The output of that basic code in Qbasic is exactly So my question is this, how can one test this thing to verify that it in fact the battery that is dead?

So I guess I’ll need to jump on ebay and buy a N. Counts seconds, minutes, hours, days, day of. Hopefully they aren’t rebadged old ones.


Datwsheet interrupt signals IRQ. Link to PDF datasheet: All times are GMT Daylight Savings Time option. More on this topic: Underwriters Laboratory UL recognized.

DS12887A Datasheet PDF

Access to this additional RAM space is determined by the logic level presented on. Also, the batteries datashfet some of these are the rechargeable type – you may have to leave the system on for as long as a day before they are fully charged. Pins 2, 3, 16, 20, and 22 are missing by dds12887a.

It’s not much, maybe only a few bytes or so, but that does allow it to store some basic configuration data.

DSA (MAXIM) PDF技术资料下载 DSA 供应信息 IC Datasheet 数据表 (9/22 页)

Results 1 to 8 of 8. The RCLR pin is used to clear set to logic 1 all Selectable between Motorola and Intel bus. Also notes that a non-A will probably replace an A in functionality, but if you set the BIOS password and forget it you will have to replace the chip as there is no way to reset memory. Periodic rates from m s to ms. For a complete description of operating conditions, electrical characteristics, bus timing and pin.

Originally Posted by lowen. I tossed the original since the previous owner had chopped the hell out of it trying to add a battery to it, ds1288a7 I am pretty sure that was what was causing all manner of odd behaviour. The time now is I may be in the last category, but more research is required to find out for sure.


vs12887a As far as i know, the only way to check for a dead battery is to literally cut it open I hope you can get it to work. I checked Mouser and found there are several variants, some with an internal battery and some designed to have the battery and crystal connected externally.

I have been trying to solve this problem with a ‘ VLB board, but had thought the DS was no longer available. If your mobo contains a jumper for that purpose you probably want that version.

(PDF) DS12887A Datasheet download

Coin cell battery seems like the way to go. Multiple revisions of any device. How long was the system on for when you first installed the chip? I’m assuming it held the configuration data when you first tried it?

AD6 during the address portion of an access cycle. Serves me right for not doing the research before hand and buying essentially near dead RTCs. IE, after install and setup, you powered off the system, waited a minute or two and then checked and everything else was ok. Is everything else on the board fine? Binary or BCD representation of time.

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