Power of a solid kind (pin 20 of IDE port)
Louis Ohland
Input Power
The 40-Pin IDE Flash Module offers 2 ways to get
input power, either via the small power cord or
through Pin 20 of the IDE connector. If Pin 20 of the
IDE connector is defined as NC (No Connect), then
the 40-Pin IDE Flash Module must be directly
connected to your system�s power supply. If Pin 20 of
the IDE connector is defined as VCC, then the 40-Pin
IDE Flash Module can get necessary power without
use of the power cord.
William R. Walsh
I'm not aware of anyone else implementing this method of power
delivery. I'm also not sure what it would do to a hard disk.
William
Louis Ohland
I have no idea, either. BUT you can burn out a Disk on Module if pin 20
has power, and you also hook up the separate power cord. Duh!
Peter H. Wendt
> William R. Walsh wrote:
>> Some VIA mini-ITX and pico-ITX motherboards implement this.
So do have some Digital / Satellite TV receivers and some networking
gear that used to have CF storage ports.
>> I'm not aware of anyone else implementing this method of power
>> delivery. I'm also not sure what it would do to a hard disk.
Nothing. Normally.
The pin #20 should be "Coding - Internally Not Connected".
> I have no idea, either. BUT you can burn out a Disk on Module if pin 20
> has power, and you also hook up the separate power cord. Duh!
??
Don't think so.
If it gets +5V on the pin 20 and +5V on a separated power plug nothing
should happen at all.
--
Peter from Germany
http://www.mcamafia.de
William R. Walsh
> Don't think so.
> If it gets +5V on the pin 20 and +5V on a separated power plug nothing
> should happen at all.
What about a +5V source that comes from a different power rail in the
power supply? Wouldn't that spell bad news in pretty short order?
William
Louis Ohland
>> I have no idea, either. BUT you can burn out a Disk on Module if pin
>> 20 has power, and you also hook up the separate power cord. Duh!
>
> ??
> Don't think so.
> If it gets +5V on the pin 20 and +5V on a separated power plug nothing
> should happen at all.
Peter, I was reading a manufacturer's FAQ, and one question was if the
DOM was burnt up.
Peter H. Wendt
Hmmm. If they are both cleanly regulated to +5V little problem should
occur. Things might come bad when either of the two is turned off
(earlier then the other one) ... in this case the copper interconnect
acts as a fuse at the weakest spot.
BOOF - Sparks and campfire.
If I were a circuit designer for IDE / CF components I would add a
handful of Schottky diodes and block the DC sources against each other -
and offer supply from both ends.
The generic IDE port however has no pin at 20 and *if* there is a pin
you could assume that the device manufacturer might support supply via
pin 20 - and take some care.
http://pinouts.ru/DiskCables/ide2cf_cable_pinout.shtml
Peter H. Wendt
That surprises me a bit to be honest.
Well ... maybe if you use a wrong power supply port / pin lik on the
usual 4-pin FDD header and feed in +12V where +5V belong. *That* will
surely toast the CF in no time. I once had these MADEX interposers as
you may recall that have a separate SMPS for the P233MMX core voltage.
One of the adapter plugs (from big Molex 4-pin to 3.5" FDD header) had
the red and yellow wire interchanged on the FDD end.
You guessed what happened when I tested the thing ?
12V and a few dozen amps from the might 95A 400W supply. Humma !
I was glad I didn't need a fire extinguisher. The SMPS didn't survive.
Fortunately it happened during a bench test with no CPU and not
installed on a platform or inside the 95A
Tim WBST Clarke
"Peter H. Wendt" <peter...@mcamafia.de> wrote in message
news:IcadnZtRftClnbHW...@westnet.com.au...
Sounds similar to what happened to my lovely AS/400 UPS battery backup
device that had come all the way from the U.S. Naturally I checked that it
was setup for 220/240V AC supply before doing anything. OK, power on...
PoooFffTtt!!!
Someone had reversed the -ve and +ve AC connections *inside* the UPS where
the internal PSU spade connectors attached to the back of the mains cable
plug's receptacle. Whaaat!! Try "claiming" for something like that with
eBay. How in God's name can you *prove* that it was the seller or someone
prior to him that had done this? Another "life lesson", even the *obvious*
needs checking.
--
Cheers,
Tim Clarke (a.k.a. WBST)
Guildford, U.K.
William R. Walsh
> That surprises me a bit to be honest.
Maybe it's intended in the "Never underestimate what a nincompoop (or idiot)
can do" sense?
> 12V and a few dozen amps from the might 95A 400W supply. Humma !
> I was glad I didn't need a fire extinguisher. The SMPS didn't survive.
I'm surprised you *found* it afterwards. Or that there was enough of it left
to identify...
William
Peter H. Wendt
>> That surprises me a bit to be honest.
>
> Maybe it's intended in the "Never underestimate what a nincompoop (or idiot)
> can do" sense?
The politically correct expression is:
"Person with a limited intellectual equipment"
(Maybe that's why you often find the plate "Limited" on the back of car
goofing around right in front of you ?)
>> 12V and a few dozen amps from the might 95A 400W supply. Humma !
>> I was glad I didn't need a fire extinguisher. The SMPS didn't survive.
>
> I'm surprised you *found* it afterwards. Or that there was enough of it left
> to identify...
It only wendt up in smoke. Caps and resistors as well as some parts of
the printboard came off. The printboard was "medium rare" I'd say.
Louis Ohland
Look on the Transcend website, FAQ, Industrial Products.
>http://www.transcendusa.com/Support/FAQ/index.asp?LangNo=0&Func1No=11&Func2No=192<
Sorry, I don't have the exact link.
5. Why my IDE Flash Module burned and melted?
Answer:
There are several possiblities:
1. If the power cord was inserted in the wrong direction it will cause
the VCC and the GND to short and then burn the IDE Flash Module.
2. There was a power surge.
3. The IDE Flash Module`s power cord was connected when the DOM was
inserted on a motherboard that supports VCC-in for Pin20.
Peter H. Wendt
> Look on the Transcend website, FAQ, Industrial Products.
> >http://www.transcendusa.com/Support/FAQ/index.asp?LangNo=0&Func1No=11&Func2No=192<
>
> Sorry, I don't have the exact link.
>
> 5. Why my IDE Flash Module burned and melted?
> Answer:
> There are several possiblities:
> 1. If the power cord was inserted in the wrong direction it will cause
> the VCC and the GND to short and then burn the IDE Flash Module.
I largely agree here.
If only +5V and GND are supplied and how the plug is arranged it may
short out the power supply in first place, then put the reversed voltage
to the attached device.
Depending on how fast the PSU shuts down and if there are any protecting
diodes present on the device it even may survive this experiment. But I
would not bet my life for it. Reversing voltages is no good idea anyway.
If there are both +12V and +5V supplied with the power connector it will
interchange the two voltages and put +12V where +5V belongs and *that*
will surely fry the device. The FDD plug is red-black-black-yellow (+5V,
GND, GND, +12V) - but it is polarized and quite difficult to plug in
reversed.
(Not for a total moron however ...)
> 2. There was a power surge.
Maybe - but unlikely.
A power surge that kills off a CF would kill the whole PC as well.
> 3. The IDE Flash Module`s power cord was connected when the DOM was
> inserted on a motherboard that supports VCC-in for Pin20.
I *Still* disagree here.
If you feed an identical voltage from two different pins nothing bad
should happen. The DOM uses +5V and no local voltage regulator as far as
I can tell. Therefore the supply is +5V in either case - no matter if it
comes from a separate plug or via pin 20 misused on the IDE connector.
So death - where's your thorn ?
Louis Ohland
> So death - where's your thorn ?
Most likely in the grave of burnt-out motherboards. Why?
rymann....@gmail.com
I have not reading all. But my DOM Module give me the smoking signal because i have power on Pin20 and also plug the external Powercable on.
For the next time i first plug it in and test if it works, only give external power if nothing works.
Philippe