INTEGRATED CIRCUITS
DATA SHEET
OM5193H
Disk drive spindle and VCM with
servo controller
Product specification
File under Integrated Circuits, IC11
1998 Nov 02
Philips Semiconductors
Product specification
Disk drive spindle and VCM with
servo controller
CONTENTS
1
1.1
1.2
1.2.1
1.2.2
1.3
2
3
3.1
3.2
3.3
3.4
4
5
6
7
8
8.1
8.2
8.3
8.3.1
8.3.2
8.4
8.4.1
8.4.2
8.4.3
8.4.4
8.4.5
8.5
8.6
8.7
8.8
8.9
8.10
8.11
8.12
8.13
8.14
8.15
8.16
8.17
8.17.1
8.17.2
8.18
FEATURES
Servo control
Motor control
Spindle motor driver
Voice coil motor driver
Miscellaneous items
APPLICATIONS
GENERAL DESCRIPTION
Overview
Servo controller
Spindle and voice coil motor
Safety functions
QUICK REFERENCE DATA
ORDERING INFORMATION
BLOCK DIAGRAMS
PINNING
FUNCTIONAL DESCRIPTION
Serial interface
Commutation and sleep mode
Commutation control
Blanks, Watchdog and Start-up delays
Comdelim delay
10-bit ADC with 7 analog inputs
Input channels
Input ranges
Conversion modes
Programming register#0
Converter clock frequency values
10-bit VCM DAC
Reference voltage
Stand-alone op-amps
Analog switch
Charge pump voltage
Spindle driver
VCM driver
Park the VCM
Precharge the VCM
Brake the motor
Power-on reset
Thermal monitor and shutdown
Power supply isolation
External isolation diode
External power FET
Thermal behaviour
9
10
11
12
13
14
15
15.1
15.2
15.3
15.4
16
17
LIMITING VALUES
HANDLING
OM5193H
THERMAL CHARACTERISTICS
CHARACTERISTICS
APPLICATION INFORMATION
PACKAGE OUTLINE
SOLDERING
Introduction
Reflow soldering
Wave soldering
Repairing soldered joints
DEFINITIONS
LIFE SUPPORT APPLICATIONS
1998 Nov 02
2
Philips Semiconductors
Product specification
Disk drive spindle and VCM with
servo controller
1
1.1
FEATURES
Servo control
1.3
Miscellaneous items
OM5193H
•
10-bit VCM Digital-to-Analog Converter (DAC)
•
7-channel 10-bit Analog-to-Digital Converter (ADC)
•
Programmable spindle commutation control logic
•
3-wire serial interface
•
Two stand-alone operational amplifiers (op-amps) with
outputs connected to the ADC
•
Analog multiplexer with two inputs used to select VCM
seek mode or track-following mode.
1.2
1.2.1
Motor control
S
PINDLE MOTOR DRIVER
•
Precision low voltage 5 and 12 V power monitor with
hysteresis
•
Precision internal voltage reference for servo and power
control circuits
•
Thermal sense circuit with over-temperature shutdown
sensor
•
Internal charge pump voltage generator
•
Automatic brake-after-park at power-down, thermal
shutdown or sleep mode
•
Sleep mode: low power consumption mode.
2
APPLICATIONS
•
3-phase output motor driver
•
1.9 A maximum available start-up current
•
Total R
ds(on)
= 0.6
Ω
(typical) at 25
°C
•
Back ElectroMotive Force (BEMF) processing for
sensorless motor commutation
•
Linear current control
•
External current sense resistor
•
External current control loop compensation
•
Adjustable slew rate control
•
Short-circuit brake
•
Adjustable brake-after-park delay time.
1.2.2
V
OICE COIL MOTOR DRIVER
•
12 V hard disk drive products.
3
3.1
GENERAL DESCRIPTION
Overview
The OM5193H is a combination of a voice coil motor and
a spindle motor driver with embedded servo controller
designed for use in disk drives. Configuration and control
registers are set via a 3-wire serial port running up to
30 MHz to interface commonly to a microcontroller or a
digital signal processor.
The device operates at 5 and 12 V power supplies and
integrates safety functions such as power stages
overvoltage protection, power and temperature monitor,
over-temperature shutdown and dynamic
brake-after-park.
The device is contained in a QFP80 package with 18 pins
connected to the leadframe thus providing low thermal
resistance.
3.2
Servo controller
•
1.5 A maximum current capability
•
Total R
ds(on)
= 0.8
Ω
(typical) at 25
°C
•
Linear class AB output with low cross-over distortion
delay
•
Precision current control loop with external current
sense resistor
•
Programmable seek and track-following mode with
adjustable current loop gain
•
External current control loop compensation
•
Precharge during brake mode
•
20 kHz current control loop bandwidth
•
Parking function
•
Adjustable park voltage with limiter.
The servo controller includes the following circuits:
•
3-wire serial interface
•
Spindle commutation logic
•
A 10-bit ADC with 7 inputs selected by an internal
multiplexer
•
A 10-bit VCM DAC with 1.5, 2.5 and 3.5 V voltage
references
•
Two low-offset stand-alone op-amps
•
Analog multiplexer with 2 inputs.
1998 Nov 02
3
Philips Semiconductors
Product specification
Disk drive spindle and VCM with
servo controller
The serial interface is used:
•
To adjust the timing parameters for proper spindle
commutation sequence
•
To accurately adjust head positioning via the 10-bit VCM
DAC
•
To set VCM seek or track-following mode via the
low-impedance switch
•
To select and process analog signals via a 7-channel
multiplexer connected to the 10-bit ADC.
The spindle commutation logic circuit ensures proper
spindle start-up (no reverse rotation) and commutation
sequence for the spindle driver by processing BEMF
sensing circuit output signals.
The two stand-alone op-amps, with the inputs connected
to the read channel IC, provide servo track signals
processed by the microcontroller to perform accurate
track-following mode.
3.3
Spindle and voice coil motor
3.4
Safety functions
OM5193H
The OM5193H is protected against transient voltage
spikes that are generated by the inductive loads of spindle
and VCM.
Power supplies and temperature are monitored in order to
guarantee data reliability and self-protection of the device
in case of power loss or temperatures beyond maximum
rating.
Park and brake functions secure heads and disk media in
case of power-down or high temperature failure. This
function is also activated by the sleep mode.
An internal temperature monitor is available to monitor the
chip temperature and thus prevents over-temperature
shutdown. Internally connected to the ADC channel 4, it
can be used by the microcontroller as an early
‘temperature-too-high’ warning during a long VCM seek
sequence.
The OM5193H drives a 3-phase brushless, sensorless DC
spindle motor and a voice coil motor.
Spindle and voice coil motor power stages with low R
ds(on)
and high current capability are suitable for mid-end and
low-end 12 V disk drives. Power stages are designed in
such a way that external Schottky diodes are not needed.
Spindle current is sensed by an external resistor and
monitored by the external signal SPCC (SPindle Current
Control). Spindle speed is regulated by the microcontroller
via the ZCROSS signal (Zero CROSSing detection
frequency output). BEMF comparators provide the digital
zero crossing signals. These are processed by the
commutation logic circuit to properly switch-on and
switch-off spindle power drivers thus ensuring the rotation
of the motor.
The control of the heads positioning is accomplished by
the internal 10-bit VCM DAC. Seek and track-following
VCM current loop gain is set by external resistors. VCM
zero current is referenced to the 2.5 V internal voltage
reference.
An internal precharge of the actuator (magnetic latch)
during brake mode guarantees total control of the current
when VCM starts running without current spikes.
1998 Nov 02
4
Philips Semiconductors
Product specification
Disk drive spindle and VCM with
servo controller
4
QUICK REFERENCE DATA
SYMBOL
Supply voltage
V
DDA1
V
DDD
V
DDA2
Drivers
I
SPOUT
I
VCMRUN
5
spindle start-up current
VCM current
−
−
−
−
5 V analog supply voltage
5 V digital supply voltage
12 V analog supply voltage
4.5
4.5
10.8
5.0
5.0
12.0
PARAMETER
MIN.
TYP.
OM5193H
MAX.
UNIT
5.5
5.5
13.2
V
V
V
1.9
1.5
A
A
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
QFP80
DESCRIPTION
plastic quad flat package; 80 leads (lead length 1.95 mm);
body 14
×
20
×
2.8 mm
VERSION
SOT318-2
OM5193H
1998 Nov 02
5
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