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PDF A8980CJT Data sheet ( Hoja de datos )
| Número de pieza | A8980CJT | |
| Descripción | SUPERSERVO SPINDLE & VOICE-COIL ACTUATION MANAGER/DRIVER | |
| Fabricantes | Allegro MicroSystems | |
| Logotipo |  |
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8980
SUPERSERVO™
8980SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
TM
SUPERSERVO SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
BACK-EMF and
COMMUTATION LOGIC
8
SPIN-DEMAND
The A8980CJT provides complete drive, management, and control
of the voice-coil and spindle motor power actuation subsystems used
in hard disk drives. Extensive programmable control features and
system diagnostics are provided via a serial interface under the
direction of an external microcontroller. The large-scale integration
and use of advanced DABiC™ (digital/analog-BiCMOS) merged
technologies results in minimum power dissipation, minimum operating
voltage requirements, and minimum external components.
12
SERVO-DEMAND
The spindle drive function incorporates a three-phase MOS power
TSER DATA IN
SERVO CONTROL
ADJUST
VOLTAGE REF.
VREF(X2)
DUC YDwg.PP-048
Dwg. PP-048
TINUEEDRPERNOCE ONLABSOLUTE MAXIMUM RATINGS
N Fat TA = +25°C
O ELoad Supply Voltage, VCC(PWR) .......... 7.0 V
Spindle Output Current, IOUT(S) ......... ±1.6 A
C RVoice-Coil Output Current, IOUT(S) .... ±0.9 A
ISOutput Current, IOUT(S) ...................... ±1.6 A
RLogic Supply Voltage VCC(D) ............... 6.0 V
Operating Temperature Range,
D OTA ..................................... 0°C to +70°C
FOutput current rating may be restricted to a value
determined by system concerns and factors.
These include: system duty cycle and timing,
—ambient temperature, and use of any heatsinking
driver and a back-EMF sensing motor commutation scheme. Internal
logic and analog circuitry provide complete start-up and µC-assisted
run modes without the need for snubbers or other external compo-
nents. Additional headroom is achieved by a proprietary circuit, which
eliminates the need for an external current-sense resistor. Intrinsic
ground clamp and flyback diodes are also provided.
The voice-coil function contains a 12-bit DAC, tunable low-pass
and notch filters, and a full-bridge power driver. The MOS outputs
provide increased available voltage and lower power dissipation over
bipolar devices. Voice-coil current is sensed by internal circuitry that
eliminates the need for an external current-sense resistor. Additional
internal circuitry can be configured to provide an over-velocity fault
limit by utilizing the internally monitored current of the voice-coil motor.
The spindle and voice-coil control functions are supplemented by
an ENERGY MANAGER™ subsystem, which efficiently channels available
power to protect the heads and the data disk during system failure or
normal system shutdown. Synchronous rectification of spindle
back-EMF voltage provides nearly lossless conversion of spindle
rotational inertia into power to operate the voice coil motor for parking
the heads. A dc-to-dc converter provides continuous operation at
minimum supply voltages. In addition, the ENERGY MANAGER subsystem
provides several sleep modes and latched fault states for undervoltage
or thermal faults.
The A8980CJT is supplied in a 64-lead thin quad flatpack for
surface-mount applications.
FEATURES
Voice Coil Motor Driver:
s Low rDS(on) MOS Outputs
s Lossless Current Sensing
s Zero Deadband
and/or forced cooling.
s User-Adjustable Transconductance Gain
s Retract Circuitry Functional to 0 V
1 page  
8980
SUPERSERVO™
SPINDLE & VOICE-COIL
ACTUATION MANAGER/DRIVER
VBOOST(L)
VPF(GATE)
VREF
VREF(x2)
POROUT
TRIP ADJ
CLK
SER DATA IN
CLK SER
LOAD
EXT XFR
AMUX1
AMUX2
DMUXOUT
OUTP
OUTN
VSENS(act)
Internally generated intermediate voltage for driving the gates of all sink-side power output
transistors, the bandgap reference, and fault monitors. This source is regulated and requires
a compensation capacitor from this terminal to ground.
Control voltage provided to drive the gate of an optional external enhancement-mode power
FET, augmenting the internal blocking FET between VCC(PWR) and VM.
Programmable reference voltage output. This reference tracks VREF(x2) and may be used as a
relative signal ground.
Programmable reference voltage output. Derived from a trimmed internal bandgap reference.
May be used as the reference for system DAC and ADC.
Power-on reset for the application system. Active low guaranteed by design to be active on
power up. Also occurs as a result of VCC(A) degrading below the BLACKOUT under-voltage
threshold.
VUV (TRIP); trip threshold adjust input (an external resistor divider between VCC(A) and ground) for
the under-voltage BLACKOUT fault monitor. A capacitor at this terminal can provide for time
domain filtering.
fCLK(2MHz); reference for all internal analog signal-processing functions. Affects frequency
domain placement of all poles, zeros, and bandwidths.
Non-inverting microcontroller serial-data input used for transferring data to all internal parameter
and mode-control registers.
fCLK(SER); reference for the serial data interface. Data is transferred on the positive-going edge
of this clock.
Active low. Begins and ends data transfer.
Direct clock gating data from temporary internal latch to control register. This continuous time
input is redundant to the XFR bit, which is embedded in the serial data format. It is internally
synchronized to the fCLK(2MHz) positive-going edge.
Analog input or output. Also used to drive internal nodes.
Analog input or output. Also used to drive internal nodes for calibration and measurement on
internal analog functions.
Non-inverting digital multiplexer output. Used to probe internal nodes allowing precise time-
domain measurements. Also used to extract internal status and diagnostic information.
VOUT(P); voice-coil power output. Full-bridge differential complement to VOUT(N).
VOUT(N); voice-coil power output. Full-bridge differential complement to VOUT(P).
The voltage at this terminal is proportional to voice-coil actuator current.
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet A8980CJT.PDF ] | |
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