P T 3 3 8 PTI
NO MORE PRODUCED Native| Translation
------+-----+-----+-----
Form 3.5"/HH Cylinders 615| | |
Capacity form/unform 32/ 39 MB Heads 6| | |
Seek time / track 35.0/12.0 ms Sector/track 17| | |
Controller MFM / ST412 Precompensation
Cache/Buffer KB Landing Zone
Data transfer rate 0.625 MB/S int Bytes/Sector 512
0.625 MB/S ext
Recording method MFM operating | non-operating
-------------+--------------
Supply voltage 5/12 V Temperature *C 5 50 | -40 60
Power: sleep W Humidity % 8 80 | 8 80
standby 5.0 W Altitude km -0.457 3.000| -0.610 12.000
idle W Shock g 3 | 80
seek 6.5 W Rotation RPM 3517
read/write W Acoustic dBA 45
spin-up W ECC Bit
MTBF h 25000
Warranty Month
Lift/Lock/Park YES Certificates CSA,TUV,VDE
**********************************************************************
L A Y O U T
**********************************************************************
PTI PT225/PT338/PT238R/PT357R OEM MANUAL
+---------------------------------------------------------+/ J4
| +-J5----+ +-+ |XX
| +-------+ J10 | |XX
| Resistor| | |XX
| +J9--+ | | |XX
| +----+ +-+ |XX
| +-+ |XX
| J6 | |XX
| | | |XX J1
| | | |XX
| +-+ |
| |XX
| |XX J2
| +-J7-----+ |XX
| +--------+ |XX
| +-J8-----+ |XX
| +--------+ |XX XXJ3
| XX
+---------------------------------------------------------+ Power
**********************************************************************
J U M P E R S
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PTI PT225/PT338/OT238R/PT357R OEM MANUAL
Jumper setting
--------------
x = Jumpers are set at factory
J1 Control Signals
-------------------
+----------+---------+---------------+------------+
|Ground Re-| Signal | Function | Direction |
|turn Pin | Pin | | |
+----------+---------+---------------+------------+
| 1 | 2 | (Reserved) | Input |
+----------+---------+---------------+------------+
| 3 | 4 | Head Select 2 | Input |
+----------+---------+---------------+------------+
| 5 | 6 | Write Gate | Input |
+----------+---------+---------------+------------+
| 7 | 8 | Seek Complete | Output |
+----------+---------+---------------+------------+
| 9 | 10 | Track | Output |
+----------+---------+---------------+------------+
| 11 | 12 | Write Fault | Output |
+----------+---------+---------------+------------+
| 13 | 14 | Head Select 2*| Input |
+----------+---------+---------------+------------+
| 15 | 16 | (Reserved) | To J2-7 |
+----------+---------+---------------+------------+
| 17 | 18 | Head Select 2 | Input |
+----------+---------+---------------+------------+
| 19 | 20 | Index | Output |
+----------+---------+---------------+------------+
| 21 | 22 | Ready | Output |
+----------+---------+---------------+------------+
| 23 | 24 | Step | Input |
+----------+---------+---------------+------------+
| 25 | 26 | Drive Select 1| Input |
+----------+---------+---------------+------------+
| 27 | 28 | Drive Select 2| Input |
+----------+---------+---------------+------------+
| 29 | 30 | Drive Select 3| Input |
+----------+---------+---------------+------------+
| 31 | 32 | Drive Select 4| Input |
+----------+---------+---------------+------------+
| 33 | 34 | Direction In | Input |
+----------+---------+---------------+------------+
The pin assignment follow industry standard practice for the designa-
ted functions.
J2 Data Signals
----------------
+----------+---------+---------------+------------+
|Ground Re-| Signal | Function | Direction |
|turn Pin | Pin | | |
+----------+---------+---------------+------------+
| 1 | 2 | Drive Selected| Output |
+----------+---------+---------------+------------+
| 3 | 4 | (Reserved) | Output |
+----------+---------+---------------+------------+
| 5 | 6 | Write Protect | Input |
+----------+---------+---------------+------------+
| 7 | 8 | (Reserved) | To J1-16 |
+----------+---------+---------------+------------+
| 9 | 10 | Spare | |
+----------+---------+---------------+------------+
| 11 | 12 | Ground | |
+----------+---------+---------------+------------+
| | 13 | +Write Data | Input |
+----------+---------+---------------+------------+
| | 14 | -Write Data | Input |
+----------+---------+---------------+------------+
| 15 | 16 | Ground | |
+----------+---------+---------------+------------+
| | 17 | +Read Data | Output |
+----------+---------+---------------+------------+
| | 18 | -Read Data | Output |
+----------+---------+---------------+------------+
| 19 | 20 | Ground | |
+----------+---------+---------------+------------+
The data signal connector pin assignment follow industry
standard practice for the designated functions.
J3 D-C Power Supply
--------------------
Viewed from mating side
+---------+
| 4 3 2 1 |
+-+-+-+-+-+
| | | +---------- +12 VDC, Wired Color: Red
| | +------------ +12 VDC return, Wired Color: Black
| +-------------- + 5 VDC return, Wired Color: Black
+---------------- + 5 VDC, Wired Color: Yellow
Pin Assignments - The d-c power connector pin assignment follow
industry standard practice for the designated functions.
J6 Drive Adress
-----------------
+---------------+
| J6 |
++-+-+-+-+-+-+-++
* * * * * * * *
| | | | | | | |
| | | | | | | +---------- Drive Select 1
| | | | | | +------------ Drive Select 2
| | | | | +-------------- Drive Select 3
| | | | +---------------- Drive Select 4
+-+-+-+------------------ Factory use only
In multidrive installatons (up to maximum of four drives per host
controller) it is necessary to configure each drive with a unique
address. Each drive is shipped from the factory addressed as Drive 1.
The drive may be changed to 2, 3, or 4 by changing the jumper socket
on J6. Plug J6 is mounted on the printed circuit board immediately
behind plug J1.
Note: The other four pairs of pins on plug J6 are used for factory
diagnostics. They must not be jumpered in normal field use because
drive malfunction and data erasure could result.
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I N S T A L L
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PTI PT225/PT338/PT238R/PT357R OEM MANUAL
Notes on installation
=====================
Installation direction
----------------------
The drive can be mounted in any position!
Mounting the Drive
------------------
3 " Configuration
The drive can be mounted in any position, making it ideal for
portable applications. Overall width, height, and depth, mounting
holes, and other key dimensions are compatible with industry standard
minifloppy disk drives, to allow direct interchangeability.
Sixteen 6-32 UNC-2B tapped mounting holes are provided, however only
four are normally used a time. Eigth holes are provided for two
alternative methods for side mounting, and eigth are for two alter-
native methods for bottom mounting.
The drive mounting frame must be used as part of the enclosure
structure. Mounting points must be adjustable or resilient to prevent
placing any undue stress on the drive mounting frame.
The drive assembly is attached to the mounting frame with four shock
mounts. Two precautions must be observed to assure the effectiveness
of the shock mounts: Sufficient clearence must be provided around the
drive assembly to allow at last 0.1" movement during acceleration,
and mounting screw length must be chosen to engage no more than six
threads (3/16") to prevent the screws interfering with the drive ass-
embly. This will also assure that the screws will not bottom out in
the blind-tapped holes.
The mounting screws should be tightened to at least 9 inch-pounds,
but no more than 11 inch-pounds.
The usual open interior construction of the host enclosure will
normally provide adequate convection cooling within the temperature
limits given in the specifications of the drive.
5 " Configuration
Optional bracket may be supplied already attached to the two sides of
the drive mounting frame, to permit the drive to be inter inter-
changeably used in standard 5 applications. One set of four base-
mounting holes and two sets of four side-mounting holes are provided.
Normally only one set of holes is used in time. The holes are tapped
6-32 UNC-2B.
Caution:
PTI drives are precision products that have been engineered to
withstand normal handling when installed according to the accompany-
ing instructions. However, they should be handled with the care
warranted by any precision instrument and not dropped, jarred, or
bumped. When the drive is not in its shipping container or installed
in its properly designed host enclosure, it must be stored on a soft
padded conductive (antistatic) surface.
Failure to comply with the above procedure will void all warranties.
Available Configuration
-----------------------
The PTI drives covered by this manual are the Models PT225, PT338,
PT238R, and PT357R. These model numbers refer to the basic 3 " micro
Winchester package. The distinguishing differences are as follows:
PT225: A two-disk drive designed for MFM applications.
PT338: A three-disk drive designed for MFM applications.
PT238R: A two-disk drive designed for RLL(2,7) applications.
PT357R: A three-disk drive designed for RLL(2,7) applications.
Each of these four basic models is also available with adapter brack-
ets suitable for mounting the drive in a chassis designed for
standard 5 " half-height drives.
Each of the models may also be supplied with an optional bezel
incorporating an activity LED.
The 5 " mounting versions are packed one to a shipping carton, the
basic 3 " versions are packed one or two to a shipping carton.
Wiring Method
-------------
Wiring for J1 and J2 should be in separate cables, and may be flat
ribbon cable or twisted pairs. Cables from the drive to the host
should be no longer than 20 feet. Wires for J3 and J4 should be no
smaller than #18 AWG.
Single-Drive Systems - In a single drive system, all wiring runs
directly from the drive to the host system. Cables for J1 and J2
should run directly to the controller. Wires for J3 should run
directly to the host power bus and the frame ground on J4 should run
directly to the host system frame ground point.
Multi-drive Systems - When a system contains more than one drive, a
multiplexing process is used to direct thecontrol signals to or from
the appropriate drive. The Control signals on J1 may be "daisy-
chained" from one drive to the next.
MULTIDRIVE SYSTEM INTERCONNECTIONS
----------------------------------
HOST
+----------+ CONTROL +---------------------+
| |x---o------------------x|J1 |
| | | +---DATA1-------x|J2 Drive #1 |
| | | | +---------x|J3 J4 |
| | | | | +-----x---------------+
|Controller| | | | +------------+
| | | | | | +---------------------+
| | o--+-----+---+-----x|J1 |
| | | | +-DATA2+-----x|J2 Drive #2 |
| | | | | o---+-----x|J3 J4 |
| | | | | | | +-----x---------------+
| | | | | | o------------+
| | | | | | | +---------------------+
+----------+ o--+--+--+---+-----x|J1 |
+----------+x---+--+ | ++---+-----x|J2 Drive #3 |
| | | | |o---+-----x|J3 J4 |
| |x---+-----+ || | +-----x---------------+
|Encoder/ | | || o------------+
|Decoder |x---+-DATA3-+| | +---------------------+
| | +--------+---+-----x|J1 |
| |x--DATA4-----+---+-----x|J2 Drive #4 |
| | o---+-----x|J3 J4 |
+----------+ | | +-----x---------------+
| | |
DC VOLTAGES ------+ o------------+
(RADIAL) |
|
FRAME GROUND ----------+
(RADIAL)
Bezel
-----
An optional bezel may be provided already mounted for the 3 or 5
configuration. An activity LED is provided on the front of the bezel,
and plugs into J9 on the front of the printed circuit board.
Mechanical Interface
--------------------
Mechanically incorporating the drive into a host system entails
making provision for securely mounting the drive frame and dressing
the cables for the external electric connections.
Electrical Interface
--------------------
Electrical connections to the drive are made through two double-sided
card-edge connectors (J1, J2), a cable plug (J3), and a frame ground
lug (J4). The general functional category of each connector is as
follows:
J1 Control Input and Output Signals
J2 Data Input and Output Signals (plus DRIVE SELECTED and WRITE
PROTECT Control Signals)
J3 D-C Power Supply
J4 Frame Ground
This separation of connectors by function relates to the recommended
wiring method. The wiring for the control signals on J1 may be a
single cable that is looped or "daisy-chained" from one drive to the
next. The data and control signals on J2 plus the power and ground
wires (J3 and J4), must be wired in a radial or "star" configuration
directly from the controller to each drive.
D-C Power
---------
The power supply lines from the host to the drive consist of +12
Volts d-c, +12 Volts Return, +5 Volts d-c, and +5 Volts Return. All
power supply voltages necessary for the operation of the drive are
supplied through J3.
The ripple and voltage should be held within the values given in the
specifications. Any excursion outside these tolerance will initiate a
Power-Fail condition, which causes the heads to retract and the
spindle to brake. When power returns within tolerance, the drive will
reinitialize. (A momentary power glitch may require the drive to be
deselected and reselected.)
Power to operate both the electronics and the drive motors must be
provided from an external source through connector J3 on the printed
circuit board. Two separate supply voltages are required: +12 and
+5 Volts. The motor receive their drive current from the 12-volt
supply. The external supply must be able to maintain the d-c voltages
and the ripple content within the tolerances under all conditiones of
normal operation.
J1 Control Signals
-------------------
Connector J1 is a two-sided card-edge plug with 34 golg-flashed
contacts located 17 on each side, on 0.1" centers. The pins are
numbered 1 through 34. The odd-numbered contacts are located on the
side of the printed circuit board closer to the drive assembly (the
side with most of components). The end contacts on each side are
identified by numbers printed on the board. A polarzing-key slot is
located between pins 4 and 6. A recommended mating ribbon connector
is AMP part number 88373-3. It must be equipped with a polarizing key
between pins 4 and 6.
J2 Data Signals
----------------
Connector J2 is a two-sided card-edge connector with 20 gold-flashed
contacts located 10 on each side, on 0.1" centers. The pins are
numbered 1 through 20. The odd-numbered contacts are located on the
side of the printed circuit board closer to the drive assembly (the
side with most of components). The end contacts on each side are
identified by numbers printed on the board. A polarizing-key slot is
located between pins 4 and 6. A recommended mating ribbon connector
is AMP part number 88373-6.
J3 D-C Power Supply
--------------------
Connector J3 is a male four-pin plug, AMP P/N 1-480426-0, mounted on
a 6-inch pigtail attached to the printed circuit board. The pins are
numbered 1 through 4. The recommended mating connector is AMP part
number 1-480424-0 equipped with four part number 60617-4 pins.
J4 Frame Ground
-----------------
The Frame Ground lug must be connected directly to ground to achieve
the error rates given in the specification. Use a minimum size of #18
AWG wire.
The Frame Ground line between the host and the drive connects to
ground lug J4 on the drive. To meet the error rate specified, it is
important that this be connected to the main system grounding point.
Connector J4 is a quick-connect lug terminal, AMP Faston part number
61761-2. The recommended mating connector is AMP Faston part number
62187-1. If the mating connector is not used, the ground lug is
equipped with a soldering hole to accommodata up to #18 wire.
J10 Termination Resistor Pack
------------------------------
In multidrive systems where the control signal cables is daisy-
chained from one drive to the next, it may be necessary to remove the
terminating resistor from socket J10. The drive is shipped from the
factory with the resistor pack installed.
Leave the resistor pack in place for a single drive system or in the
last drive on the control cable (farthest from the controller) in a
multidrive system.
**********************************************************************
F E A T U R E S
**********************************************************************
PTI PT225/PT338/PT238R/PT357R OEM MANUAL
General
-------
The Peripheral Technology Inc. (TI) family of 3 inch Winchester disk
drives provides high performance, reliability, and low cost in a
standard-size pckage. These microWinchester drives offer OEM and VAR
users state-of-the-art 40 millisecond access time, very low power
requirements, the industry standard ST506/412 interface, and a choice
of memory capacity in a small package, for easy incorporation into
the newest generation of small desktop and portable computers, in-
strumentation systems, and multiuser systems.
The four models provide a choice of data storage: either two or three
disks, and either standard "MFM" encoding or the greater data density
of "RLL" encoding.
In the design and development of these new drives, a fresh look was
taken at solving major problem areas in existing products.
Winchester drives typically require a tradeoff between speed and
significant power demands, and are very susceptible to data loss and
irrecoverable damage from the shock and vibration of normal handling.
The speed/power tradeoff was not only overcome, but the innovative
design resulted in a drive with access time about half that of
previous microWinchester and a power consumption of less than six and
a half watts. The problem of data loss from normal handling was
eliminated by automatically retracting and looking the heads in a
non-data landing zone. This system is completely passive during
normal operation. It functions not only when the power is manually
turned off but also if there is an external supply or an internal
malfunction.
The PTI drives now now make it possible to make a battery-operated
portable unit that is power efficient, insensitive to operating
position, and immune to normal handling problems.
Features
--------
All PTI drives incorporate the following features, for superior
performance and ease of use.
- Proprietary system automatically moves heads away from the data
area into a landing zone, where they are automatically locked,
whenever power to the drive is removed.
- Dynamic spindle braking action follows head locking, quickly
stopping disks to minimize wear to head and medium.
- Pulse-width modulation of motor drive current provides high
efficiency, for reduced heat losses and longer component life.
- Always-on buffered seek provides optimum head positioner velocity
profile for faster access time.
- Head-positioning servo always moves on the leading edge of first
step pulse even through additional pulses are still being receiv-
ed.
- Embedded Track Zero provides increased reliability and greater
precision with today's higher track desities.
- Microprocessor-controlled Servo Calibration and Initialzation
maintains continued accuracy and reliability.
- Optical encoding in conjunction with position information embedded
in each track precisely controls both position and velocity of
read/write heads and hard disk.
- Use of a brushless servo motor in conjunction with a rack and
pinion drive provides efficent and precise head positioning.
- Digital closed-loop servo drive system sharply reduces power
demand to less than 6.5 watts.
- Mechanical and electrical interfacing follows industry standards
to cut system integration time and simplify special applications.
Cooling
-------
The very low power requirement of the PTI drive eliminates the need
for large internal heat sinks and external fans for the drive itself.
By reducing the total heat dissipation of the system and reducing the
drain on the host power supply, it will also reduce the need for a
system cooling fan.
Maintenance
-----------
No routine maintenance is necessary for PTI drives. There are no
adjustments on the electronics circuit board, other than the config-
uration procedure when used in a multidrive system. The mechanismus
is sealed system and requires no additional lubrication.
Repair
------
If a drive is suspected of malfunctioning, substitute a known-good
drive if possible. Verify that all control and data signals conform
to the level and timing requirements given in this manual.
PTI does not recommended making any repairs to the electronics
printed circuit board, including complete substitution of another
board. Any service to the HDA (Head/Disk Assembly) can only be done
in a clean room environment, so the complete drive must be returned
to PTI for service.
ANY ATTEMPT TO OPEN THE SEALED ENCLOSURE WILL VOID THE WARRANTY.
Reliability
-----------
MTBF: 25,000 poh
Preventive Maintenance: None
MTTR: 30 min
Service Life: 5 years
