BENEFITS AND FEATURES. • Easily Add Traceability and Relevant Information to Any. Individual System o. 1k-Bit EPROM with Page-Level Write Protection. DALLAS component – connected to the 3rd wire in the AC power adapter So the DS in the DELL AC Power Adapter contains the. dallas ds Datasheet datasheet, cross reference, circuit and application notes in pdf format.

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Trying to figure it’s function from the outside proves to be futile. When detached from the laptop it carries no signal, voltage, capacity or resistance. It seems like a dead wire leading no where.

Dallas DS – Neo24

So it’s time to figure out where this AC Adapter Identification wire is going. It’s a transistor shaped component with 3 pins.

The middle pin is connected to the AC Adapter Identification wire, the other pin to V- of the power plug. The 3rd wire is not connected. Pretty strange for a transistor, where all 3 pins are usually all connected. Not the typical markings on a transistor. The difference is the size of the memory. The DS seems to be byte memory.

The memory is accessed using a 1 wire communication protocol known as “1-wire”. The DELL laptop reads the identification info during startup of when it’s connected while started. Power for the memory device comes from the laptop which is the same AC Adapter Identification wire, indicated as a “parasite power circuit”. Pretty nifty solution – however, it proved to be a vulnerable one, with many victims.


A quick test to see if wiring, jack or plug is causing intermittent connections is to boot the laptop into setup mode.

ds2501 dallas

If not the field doesn’t change for a few seconds and then reports “unknown AC adapter”. Move the cable, plug, jack if possible and see if the field is updated or intermittent.

In this case it’s likely a loose contact. If the field just says “Unknown Device Installed” all the time, try the adapter with a different DELL laptop – if it works in that case, it’s most likely the host controller chip on the mother boards or the power adapter adapter jack that needs re-soldering. This is described in the Dallas Semiconductor application note For electronics enthusiasts that’s just a bit of fun with a soldering iron and a few low cost components.

In any case, with the technology for AC Adapter identification revealed, it boggles the mind why so many DELL laptops report the same message. Most laptop dallad do not dallws their equipment around like mad – like overland travel with a 4×4 truck is.


DS Datasheet PDF –

It could be so the memory looses it’s contents over time or static discharges ruins the circuitry of the memory chip.

The center pin is like an antennait can pick up static electricity easily directly fed into the circuitry of the memory chip. Daklas an electronics engineering perspective this is weird.

Knowing it’s for mobile use and most likely should operate in rogue electrical es2501. For a power-supply, I’d call this a design flaw The Laptop Junction Extreme laptop travel.

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Legal Advertise Disclaimer Privacy. In some cases the charging circuitry on DELL laptop motherboards eallas also defective.

Although it’s not a pretty solution, it at least can avoid the costs of motherboard replacement.