Give a short voltage pulse on the STEP pin to make it move one single step, set the direction by driving the DIR pin logical HIGH or LOW.
#SINGLE PIN STACK DRIVER#
You could of course also set the DIR pins state in code.Ī stepper driver has a simple STEP/DIR interface with just two connections (3 if you include GND) to the controller. Do not keep it floating, as it could lead to unexpected direction changes. It would be in the 1.0 specifications I imagine.Ī closely related discussion, I have cross-posted as well- don't shoot me.You can hardwire the DIR pin of your driver to be either HIGH or LOW to set a fixed direction. Perhaps someone with this arcane answer can provide more info as to the thought process behind it. Much of it is behind a paywall, unfortunately. You would think the answer would be found, in depth on the SATA-IO website, but I have been unable to find it. Transmitter Emphasis Specification: A new transmitter specification increases interoperabilityĪnd reliability in electrically demanding environments.Single-Pin Activity Indicator and Spin-Up Control: An activity indicator and staggered spin-upĬan be controlled by the same pin, adding flexibility and providing users with more choices.Power Disable: Allows for remote power cycling of SATA drives to help ease maintenance in the.
#SINGLE PIN STACK SERIAL#
The comments below, in the Tom's Hardware article, point out that it would have made much more sense to have the Power disable occur when the pin is driven low, rather than high- as this would completely avoid the problem proposed above.Īs mentioned previously, according to the SATA-IO Standards group, the 11th pin provides staggered spinup AND an activity indicator- presumably for flashing LEDs and such.įrom a SATA-IO Press Release (SATA-IO is the International Organization that owns and manages Serial ATA specifications as open industry standards.):Īdditional advancements in the revision 3.3 specification include: Source-Toms Hardware Western Digital Whitepaper
The easy, and not so elegant, solution is to use a 4-pin Molex to SATA connector or a power supply equipped with SATA connectors that follow the SATA 3.3 specification. This is because P3 driven HIGH will prevent the drive from powering up. All drives with this optional feature will not power up if a legacy SATA connector is used. If P3 is driven HIGH (2.1V-3.6V), the power to the drive circuitry will be cut. To sum up, for products supporting the optional SATA 3.3 power disable (PWDIS) function, the third pin (P3) of the SATA connector is now assigned as the Power Disable Control pin. So, that 3.3v line is apparently 3.3 no longer- at least for 2 of 3. This is intended to allow power cycling of a drive, perhaps remotely, for instance.
#SINGLE PIN STACK MANUAL#
SATA 3.3 specifications create a power disable, to allow the manual or top-down control of devices. Pin 11 can function for staggered spinup, activity indication, both, or nothing.Ĭan't answer this directly, but I will add to the above answer- the 3.3V pins have been repurposed for pins 1 and 2. This two-step mating process avoids glitches to other loads and possible arcing or erosion of the SATA power connector contacts. Finally, the remaining power pins make contact, bypassing the resistances and providing a low-impedance source of each voltage.
The drive uses them to charge its internal bypass capacitors through current-limiting resistances. Drive power connector pins 3, 7, and 13 are longer than the others, so they make contact next. Ground pins 4 and 12 in a hot-swap cable are the longest, so they make contact first when the connectors are mated. Two ground pins, and one pin for each supplied voltage, support hot-plug precharging. To reduce impedance and increase current capability, each voltage is supplied by three pins in parallel, though one pin in each group is intended for precharging.įive parallel pins provide a low-impedance ground connection. The new SATA power connector contains many more pins for several reasons:ģ.3 V is supplied along with the traditional 5 V and 12 V supplies. And this particular connector shown in the question is missing the 3.3 V (orange) wire. The connector shown in the image is a 15-pin SATA connector.
0 kommentar(er)
