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'[OT]: Need info on HDD spindle + VCM driver chip.'
2001\06\06@172742 by Terry

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Hi Piclisters


Need some help from anyone involved in HDD design. I'm looking for a
sensorless (back EMF) 3 phase brushless spindle and voice coil motor
driver used in commercial HDD's. The type used in millions of disk
drives. The chip i see in my IBM drive seems to be a Hitachi OEM part
(7F1S 89G7612) and it's not on their website.


Any driver with the following specs will do:

Spindle motor Min 1.2A

Max RPM 7200

VCM min 0.5A

In a SMD copper heatsinkable package (Batwings or HSSOP)


Most importantly, i need volume pricing in the 20K/mth range. Been
searching Google and Altavista for over a week now and nada. Got some
info from Philips, Lucent and various other manufacturers but nothing
cheap enough (below US$2.00) or they've got no budgetary pricing on their
site.


If you've got any hush-hush info please mail me off-list. Thanks a
bunch!


Cheers

Terry Heng

T3DESIGN

Innovative Product Development

<italic>Thinking out of the box

</italic>

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2001\06\06@175357 by Spehro Pefhany

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At 05:26 AM 6/7/01 -0700, you wrote:
>Hi Piclisters
>
>Need some help from anyone involved in HDD design. I'm looking for a
>sensorless (back EMF) 3 phase brushless spindle and voice coil motor driver
>used in commercial HDD's. The type used in millions of disk drives. The
>chip i see in my IBM drive seems to be a Hitachi OEM part (7F1S 89G7612)
>and it's not on their website.
>
>Any driver with the following specs will do:
>Spindle motor Min 1.2A
>Max RPM 7200
>VCM min 0.5A
>In a SMD copper heatsinkable package (Batwings or HSSOP)

Hmmm.. Hitachi HA13557AFH, HA13561F, HA13571FR, HA13614FH ?

Best regards,

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2001\06\06@182900 by Eric Smith

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Terry <.....t3designKILLspamspam@spam@PACIFIC.NET.SG> writes:
> The chip i see in my IBM drive seems to be a Hitachi OEM part
> (7F1S 89G7612) and it's not on their website.

It wouldn't be on the Hitachi web site because 89G7612 is an IBM
part number.  Hitachi must be manufacturing it for IBM.

I think 7F1S is the date code.

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2001\06\07@085034 by mike

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On Thu, 7 Jun 2001 05:26:07 -0700, you wrote:

{Quote hidden}

..if you're building 20K/mth surely you can afford a few phone
calls....? The net is not the only information source!

Sanyo make a lot of this type of device, also try SGS-Thomson and
maybe Rohm.

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2001\06\07@105724 by Ken Gasper

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part 1 729 bytes content-type:text/plain; (decoded 7bit)


Terry

These days we don't use off-the-shelf drivers.  Due to the push to reduce
HDD costs and part counts, these analog circuits are all contained in
custom servo ASICs.  Since I'm a firmware developer I'm not involved in
that aspect of development and couldn't give you any suggestions.  Good
luck though.

Ken





Terry <t3designspamKILLspamPACIFIC.NET.SG>spamKILLspamMITVMA.MIT.EDU> on 06/07/2001 07:26:07 AM

Please respond to "pic microcontroller discussion list"
     <.....PICLISTKILLspamspam.....MITVMA.MIT.EDU>

Sent by:  "pic microcontroller discussion list" <EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU>


To:   PICLISTspamspam_OUTMITVMA.MIT.EDU
cc:

Subject:  [OT]: Need info on HDD spindle + VCM driver chip.



part 2 1125 bytes content-type:text/plain;
(decoded 7bit)

Hi Piclisters

Need some help from anyone involved in HDD design. I'm looking for a
sensorless (back EMF) 3 phase brushless spindle and voice coil motor driver
used in commercial HDD's. The type used in millions of disk drives. The
chip i see in my IBM drive seems to be a Hitachi OEM part (7F1S 89G7612)
and it's not on their website.

Any driver with the following specs will do:
Spindle motor Min 1.2A
Max RPM 7200
VCM min 0.5A
In a SMD copper heatsinkable package (Batwings or HSSOP)

Most importantly, i need volume pricing in the 20K/mth range. Been
searching Google and Altavista for over a week now and nada. Got some info
from Philips, Lucent and various other manufacturers but nothing cheap
enough (below US$2.00) or they've got no budgetary pricing on their site.

If you've got any hush-hush info please mail me off-list. Thanks a bunch!

Cheers
Terry Heng
T3DESIGN
Innovative Product Development
Thinking out of the box

-- http://www.piclist.com hint: PICList Posts must start with ONE topic:
[PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads




part 3 144 bytes
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2001\06\07@111918 by Spehro Pefhany

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At 01:52 PM 6/7/01 +0100, you wrote:

>..if you're building 20K/mth surely you can afford a few phone
>calls....? The net is not the only information source!

The calls would be local in his case, he is in Singapore- the
centre of world-wide HDD manufacturing. This is a serious issue
with some parts, the manufacturers simply don't promote them
outside Asia, they know that few people in, say, Canada or the
US are going to be manufacturing consumer electronics.
OTOH, some of us *design* things to be made over there- but
the manufacturer's sales offices will disavow any knowledge
of the components, and won't go to any great lengths to help
because their internal system rewards them based on the
geographical area of the sales. When I do a design for a
client in Hong Kong, which is slapped together in Shenzhnen,
the local sales droids don't get a pat on the back (or
their palms crossed with silver).

Best regards,




=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
Spehro Pefhany --"it's the network..."            "The Journey is the reward"
@spam@speffKILLspamspaminterlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com
Contributions invited->The AVR-gcc FAQ is at: http://www.bluecollarlinux.com
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

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2001\06\08@103447 by Terry

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Thanks for the replies guys and Eric for the IBM part number info.


I'm not building 20K/mth, my clients are. The phone calls are cheap, the
baggage that comes with it are not. Some will drive you nuts insisting on
sticking a microscope up your butt and others won't give you the time of
day if you're not part of the big boys' league.


The HDD business has moved to Malaysia and Thailand. One of the first few
questions i get asked is "Where will this product be assembled?" Name a
region out of their designated territory and you can hear a Whoopie
cushion deflating.


So getting budgetary prices off websites, (way to go TI, National) and
scanning product news releases give a good ballpark figure before
designing in a component. I don't even bother with ST, Lucent or Broadcom
(try getting a datasheet from this one), unless they've got a chip nobody
else has.


So what i know is Seagate's using their own chips, IBM OEM's from
Hitachi, Philips seem to be discontinuing their HDD motor controllers and
Lucent's got a new 20,000 RPM chip at over US$4.


Anybody got any more leads for me to look into?


Cheers

Terry Heng

T3DESIGN

Innovative Product Development

<italic>Thinking out of the box

</italic>


At 11:20 AM 6/7/01 -0400, you wrote:

{Quote hidden}

reward"

>KILLspamspeffKILLspamspaminterlog.com             Info for manufacturers:
http://www.trexon.com

>Embedded software/hardware/analog  Info for designers:
http://www.speff.com

>Contributions invited->The AVR-gcc FAQ is at:
http://www.bluecollarlinux.com

{Quote hidden}

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2001\06\08@165854 by Bill Westfield

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   So what i know is Seagate's using their own chips, IBM OEM's from
   Hitachi, Philips seem to be discontinuing their HDD motor controllers
   and Lucent's got a new 20,000 RPM chip at over US$4.

A tape (or was it zip?) drive I dissected recently had a clearly marked
part from Allegro.  Three-phase driver only, I think, and I didn't pay
much attention to the actual specs...

BillW

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2001\06\09@071659 by Russell McMahon

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> I don't even bother with ST, Lucent or Broadcom (try getting a datasheet from this one), unless they've got a chip nobody else has.

Single source?
Often fatal.

RM

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