--0__=86256A640051AC618f9e8a93df938690918c86256A640051AC61
Content-Type: text/plain;
 charset=us-ascii
Content-Transfer-Encoding: 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 <t3design@PACIFIC.NET.SG>@MITVMA.MIT.EDU> on 06/07/2001 07:26:07 AM

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

Sent by:  "pic microcontroller discussion list" <PICLIST@MITVMA.MIT.EDU>


To:   PICLIST@MITVMA.MIT.EDU
cc:

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


--0__=86256A640051AC618f9e8a93df938690918c86256A640051AC61
Content-Type: text/plain;
 charset=us-ascii
Content-Transfer-Encoding: 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



--0__=86256A640051AC618f9e8a93df938690918c86256A640051AC61--

--
http://www.piclist.com hint: The list server can filter out subtopics
(like ads or off topics) for you. See http://www.piclist.com/#topics