Post by thread:[OT]: Need info on HDD spindle + VCM driver chip.

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

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, =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= Spehro Pefhany --"it's the network..." "The Journey is the reward" spam_OUTspeffTakeThisOuTinterlog.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 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- http://www.piclist.com hint: PICList Posts must start with ONE topic: [PIC]:,[SX]:,[AVR]: ->uP ONLY! [EE]:,[OT]: ->Other [BUY]:,[AD]: ->Ads

On Thu, 7 Jun 2001 05:26:07 -0700, you wrote: {Quote hidden}>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'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. -- 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

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 <t3designKILLspamPACIFIC.NET.SG>KILLspamMITVMA.MIT.EDU> on 06/07/2001 07:26:07 AM Please respond to "pic microcontroller discussion list" <.....PICLISTKILLspam.....MITVMA.MIT.EDU> Sent by: "pic microcontroller discussion list" <EraseMEPICLISTspam_OUTTakeThisOuTMITVMA.MIT.EDU> To: PICLISTspam_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 -- 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

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@speffKILLspaminterlog.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 =-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= -- 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

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}>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" >KILLspamspeffKILLspaminterlog.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}>=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= > >-- >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 > > > -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.