參數(shù)資料
型號(hào)： OQ8868
廠商： NXP SEMICONDUCTORS
元件分類： 模擬信號(hào)調(diào)理
英文描述： Digital Servo Integrated Circuit Silent DSICS
中文描述： SPECIALTY ANALOG CIRCUIT, PQFP44
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 106K
代理商： OQ8868
1997 Feb 12
9
Philips Semiconductors
Product specification
Digital Servo Integrated Circuit Silent
(DSICS)
OQ8868
T
RACKING CONTROL
The actuator is controlled using a PID loop filter with
user-defined coefficients and gain. For stable operation
between the tracks, the S-curve is extended over
±
3
4
track.
Upon a request from the microprocessor, S-curve
extension over
±
2
1
4
tracks is used, automatically
changing to access control when exceeding those
2
1
4
tracks.
Both modes of S-curve extension make use of a
track-count mechanism, as described in section “Off track
counting”. In this mode, track counting results in automatic
‘return to zero track’, to avoid major music rhythm
disturbances in the audio output for improved shock
resistance. The sledge is continuously controlled using the
filtered value of the integrator contents of the actuator, or
upon request by the microprocessor. The microprocessor
can read out this integrator value and provides the sledge
with step pulses to reduce power consumption. Filter
coefficients of the continuous sledge control can be preset
by the user.
A
CCESS
The access procedure is divided into two different modes,
depending on the requested jump size (see Table 1).
The access procedure makes use of a track counting
mechanism (see section “Off track counting”), a velocity
signal based upon the number of tracks passed within a
fixed time interval, a velocity setpoint calculated from the
number of tracks to go and a user-programmable
parameter indicating the maximum sledge performance.
If the number of tracks to go is larger than break_dist, then
the Sledge jump mode is activated; otherwise, the actuator
jump is performed. The requested jump size, together with
the required sledge braking distance at maximum access
speed, defines the value break_dist.
During the actuator jump mode, velocity control with a PI
controller is used for the actuator. The sledge is then
continuously controlled using the filtered value of the
integrator contents of the actuator. All filter parameters (for
actuator and sledge) are user-programmable.
In the sledge jump mode, maximum power
(user-programmable) is applied to the sledge in the correct
direction, while the actuator becomes idle; the contents of
the actuator integrator leaks to zero just after the sledge
jump mode is initiated.
Table 1
Access modes
Note
1.
Can be preset by the microcontroller.
ACCESS TYPE
JUMP SIZE
ACCESS SPEED
Actuator jump
Sledge jump
1
break_distance
(1)
break distance
(1)
32768
decreasing velocity
maximum power to sledge
(1)
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