參數(shù)資料
型號： OM5193H
廠商： NXP SEMICONDUCTORS
元件分類： 運動控制電子
英文描述： Disk drive spindle and VCM with servo controller
中文描述： VOICE COIL MOTOR CONTROLLER, PQFP80
文件頁數(shù)： 4/56頁
文件大?。?/td> 246K
代理商： OM5193H
1998 Nov 02
4
Philips Semiconductors
Product specification
Disk drive spindle and VCM with
servo controller
OM5193H
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
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.
3.4
Safety functions
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.
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