![]() ![]() Wouldn't this make the transistor redundant? And even the most efficient LED would be drawing 10-100x the current specification of the pin, so that specification must not matter at all? (I am aware that it would turn off the LED on activity instead of the opposite, which is fine by me.) ![]() When the signal is pulled low, it removes power from the LED and deactivates the transistor when in steady-state, 3.3V would power the LED and activate the transistor. Below is the schematic I worked out.īetween my PhD EE friend and me, we don't see a need for the transistor at all. I happen to have an IcyDock 5.25" to 3.5" adapter that uses this drive activity pin for it's own LED, so I decided to poke around and copy their homework, so to speak. I've found the SATA spec references, which list pretty paltry current ratings for this pin (on the order of 100uA), so most examples I've seen of others hacking their own end up using a BJT to control an LED. The signal is active low, with 3.3V provided when not driven low. Part of the SATA standard includes provisions for drive-controlled open-collector activity status routed through pin 11 of the SATA power connector. I'm working on a personal project to add a SATA backplane to my NAS (shhh, it'll be it's own post when it's done, no spoilers ). Though I may swap out the SATA connectors for a single SFF-8643 connector. I don't know why the people writing the docs couldn't have put in a transistor like they did on the left drawing.Īnyways, time to modify my design and respin it (kinda sucks that it's ~$50 a run). V+ = 5V, R1 = 1k (horizontal), R2 = 330, and the "LED Driver" is the transistor + the 1k (vertical) on the base. See below for updated schematic:Īnd convergently, thanks to cycon at who has demonstrations of exactly this circuit and partially made me want to go back and recheck my reference.Īnd the above circuit is actually in the SATA documentation, just somewhat obfuscated (see the right one): and to my chagrin found a trace to 5V that snuck underneath a bunch of silk-screen where I could barely see it. So I finally got out my reference part and took and even closer look. I was disappointed because "I literally copied the example, why doesn't mine work?" I implemented my original design into my SATA backplane project, but the activity LEDs were. The Supermicro SuperDOM can be ordered as an integrated unit with all Supermicro SuperServer® systems to create additional customer value.Okay, one year on follow up! Because I've realized that a) I made a mistake in the original drawing and b) this post is apparently the top reference for on Google for "SATA pin 11". The Supermicro SuperDOM is designed for use as a boot drive, backup recovery device, license drive, OS installation device (replacing CD/DVD-ROMs), embedded system storage element (to be deployed into very harsh environments where mechanical hard disk drives would fail), or in a thin client due to its small size and power requirements. ![]() The Supermicro SuperDOM is available in 128GB, 64GB, 32GB, and 16GB capacities and supports all Supermicro SuperServer® products and solutions. However, it is still backward compatible with server boards requiring this 5V power cable. Due to its optimized design the Supermicro SuperDOM does not require a 5V power cable as do other SATA DOM products on the market, thus improving performance and reliability. The Supermicro SuperDOM operates up to 2x faster than other SATA DOM products in the industry. Supermicro SATA DOMs are extremely reliable without any moving parts like standard HDDs and are smaller in size and lighter in weight with greatly improved performance, latency and power consumption (~ 1W-2W per SATA DOM vs. The Supermicro SATA DOM (Disk on Module), the SuperDOM, is a small SATA3 (6Gb/s) flash memory module designed to be conveniently inserted into a serverboard SATA connector to provide high performance solid state storage capacity that simulates a hard disk drive (HDD). ![]()
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