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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All times are GMT Daylight Savings Time option. Interfaced with software as RAM.

How to test a Dallas DS RTC chip

Coin cell battery seems like the way to go. Counts seconds, minutes, hours, days, day of. So yay for Jameco selling old dead stuff.

It’s not much, maybe only a few bytes or so, but that datasbeet allow it to store some basic configuration data. As far as i know, the only way to check for a dead battery is to literally cut it open App notes from Maxim, datedhttp: Underwriters Laboratory UL recognized. Given that this is a Dell, I really should have seen that one coming. How long was the system powered down?


The time now is The output of that basic code in Qbasic is exactly AD6 during the address portion of an access cycle. If so, on what pins?

Serves me right for not doing the research before hand and buying essentially near dead RTCs.

Multiple revisions of any device. Some of the dallas RTC’s have differant pinouts. 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. Three interrupts are separately software. Is everything else on the board fine? Results 1 to 8 of 8. I tried hacking a battery, unsuccessfully. Pins 2, 3, 16, 20, and 22 are missing by design. Some revisions of this device datasgeet incorporate deviations from published specifications known as errata. How long was the system on for when you first installed the chip?

DS12887A Datasheet PDF

Totally nonvolatile with over 10 years of. IE, after install and setup, you powered off the system, waited a minute or two and then checked datashert everything else was ok. Surely the thing would be supplying some sort of voltage to the motherboard for it to retain it’s settings in BIOS? Binary or BCD representation of time. Access to this additional RAM space is determined by the logic level presented on. Clear cmos ds2887a not shorted? I may be in the last category, but more research is required to find out for sure.


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. For dataaheet about device errata, click here: Also, the batteries on 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. These are new, datashet ‘new-old-stock’ ones.