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Allegro MicroSystems

A8983CJT Datasheet Preview

A8983CJT Datasheet

SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER

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8983
SPINDLE & VOICE-COIL
8983ACTUATION MANAGER/DRIVER
SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
The A8983CJT provides for complete spindle and voice coil power
electronics for small form-factor HDDs (hard disk drives). The large-
scale integration and use of advanced DABiC (digital/analog-BiCMOS)
merged technologies result in minimum power dissipation, minimum
operating voltage, and minimum external components.
RODUOCNTLYDwg.PP-060
CONTIRNEUFEEDRPENCEABSOLUTE MAXIMUM RATINGS
at TA = +25°C
IS RLoad Supply Voltage, V
............ 7.0 V
CC(PWR)
Spindle Output
Current, I
OUT(S)
..........
±1.6
A
D OVoice-Coil Output Current, I ......
OUT(A)
±0.9
A
FLogic Supply Voltage V ................ 6.0 V
The spindle driver system incorporates a three-phase MOS power
driver and a back-EMF sensing motor commutation scheme. A pat-
ented circuit eliminates the need for an external current-sense resistor,
achieving additional headroom. Intrinsic ground clamp and flyback
diodes are also provided.
The voice-coil system incorporates a MOS H-bridge driver, sense
amplifier, error amplifier, and programmable retract circuitry.
The spindle and voice-coil control functions are supplemented by
an ENERGY MANAGER, which efficiently channels available spindle
BEMF to protect the heads and the data disk during system power
supply failure. Active regeneration of spindle BEMF provides nearly
lossless conversion of spindle BEMF into supply voltage to operate the
voice coil motor for parking the heads. A dc-to-dc converter provides for
full power MOS rDS(on) performance at minimum supply voltages. In
addition, the ENERGY MANAGER provides several energy-saving sleep
modes and latched fault states for undervoltage and serial port com-
manded fault.
The A8983CJT is supplied in a 64-lead low-profile quad flatpack for
surface-mount applications.
FEATURES
Voice Coil Motor Driver:
s Low rDS(on) MOS Outputs
s Zero Deadband
s Externally Determined Transconductance, with Hi/Lo
Configuration Switched via Serial Port
s Current Sensing with External Series Sense Resistor
s Serial Port Programmable Actuator Retract Circuitry
s Retract Circuitry Functional to 1.7 V Spindle BEMF
CC(D)
Operating Temperature Range,
TA ...................................... 0°C to +70°C
Output current rating may be restricted to a value
Spindle Motor Controller/Driver:
s Low rDS(on) MOS Outputs
s Back-EMF Circuitry Eliminates Hall-Effect Sensors
determined by system concerns and factors.
s Adaptive Commutation Delay Programmable via Serial Port
These include: system duty cycle and timing,
ambient temperature, and use of any heatsinking
and/or forced cooling.
s Programmable Slew Rate (soft switching) Eliminates Snubbers
s Intrinsic Ground Clamp and Flyback Diodes




Allegro MicroSystems

A8983CJT Datasheet Preview

A8983CJT Datasheet

SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER

No Preview Available !

8983
SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
FUNCTIONAL BLOCK DIAGRAM
ENERGY MANAGER
CONTROLLED RETRACT
DC-DC CONVERSION
SLEEP MODES
UV FAULT
+
SPIN
INPUT
gm
+
+
SERVO
INPUT
SERIAL DATA IN
CLOCK
DATA ENABLE
g m SLEW
RATE
CONTROL
BACK-EMF AND
COMMUTATION LOGIC
EXTERNAL
COMMUTATION
TACH
s Patented Lossless Current Sensing Eliminates Need
for External Current-Sense Resistor
s Externally Determined Transconductance, with Hi/Lo
Configuration Switched via Serial Port
s Forward or Reverse Torque Serial Port Bit Allows
Improved Speed Disturbance Performance
s Dynamic Braking with User Delay, Activated by
Undervoltage or Serial Port Command
Energy Manager:
s 3.0 V to 5.5 V Operation
s DC-to-DC Converter Maintains rDS(on) Performance
at Low Supply
s Independent Power-Down (Sleep) Modes for all
Functional Blocks
s Efficient Active Regeneration Supplies Power
During Retract
s Supply Under-Voltage Fault Monitor with
Adjustable Trip Point
Dwg. FP-028-1
s Power-On-Reset Generator for Power Up or
Power Loss with User-Defined Delay
s Chip Powers Up in Sleep Mode for Minimum
Power Dissipation
s External 2 MHz System Clock, or Internal Serial Port
Trimmed 2 MHz Clock
s System Diagnostics
s Uncommitted Op-amp
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
Copyright © 1995, Allegro MicroSystems, Inc.


Part Number A8983CJT
Description SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER
Maker Allegro MicroSystems
Total Page 2 Pages
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