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參數(shù)資料
| 型號： | Si9990ACS |
| 廠商： | Vishay Intertechnology,Inc. |
| 英文描述： | 5-V VCM Driver/Spindle Motor Driver For 1.8- and 2.5-Hard Disk Drives(用于1.8V和2.5V的硬盤驅(qū)動的5V語音線圈電機驅(qū)動器/心軸電機驅(qū)動器) |
| 中文描述： | 5V的氯乙烯驅(qū)動器/主軸電機驅(qū)動器1.8和2.5硬盤驅(qū)動器（用于1.8伏和2.5伏的硬盤驅(qū)動的5V的語音線圈電機驅(qū)動器/心軸電機驅(qū)動器） |
| 文件頁數(shù)： | 7/11頁 |
| 文件大?。?/td> | 345K |
| 代理商： | SI9990ACS |
Si9990ACS
Vishay Siliconix
FaxBack 408-970-5600, request 70655
www.siliconix.com
S-60752—Rev. C, 05-Apr-99
7
Motor Shutdown Sequence
The Si9990ACS executes a motor shutdown sequence
whenever V
DD
drops below 3.9 V (emergency retract), or
serial bit D0 is set low (sleep mode). The shutdown sequence
is terminated by a programmable one-shot (brake delay).
During the time-out (t
DLY
), both the spindle and VCM outputs
are turned off. Simultaneously, a separate VCM retract circuit
is activated. As shown in Figure 2, the all-bipolar design
enables retract function all the way down to a supply of 1.41 V
at V
CLAMP
pin. The retract current typically is 20 mA,
adjustable with an external resistor, R
RET
. To limit retract
velocity, a fixed clamp limits the voltage across VCM to no
more than 440 mV. After the time-out, the retract circuitry is
shut off while the spindle motor and VCM brake is activated by
turning on all low-side DMOS drivers. To brake faster (i.e.,
with lower impedance short across the motor windings) the
low-side drivers are powered by the residual charges on the
CHS bypass capacitor.
FIGURE 2.
Simplified Retract Circuit
Spindle Driver
TABLE 3.
Spindle PWM Speed Control (Double Integrator)
TABLE 4.
Spindle Commutation Sequence
Note: X = Don’t Care, Z = High Impedance
System State
P
U
P
D
P
OUT
State
Run
0
0
1
Decel
Run
0
1
Z
Hold
Run
1
0
Z
Hold
Run
1
1
0
Accel
Spindle Brake/
Sleep
X
X
0
Accel
Sequencer State
OUT
A
OUT
B
OUT
C
Reset
*
Z
Z
Z
1
High
Low
Z
2
High
Z
Low
3
Z
High
Low
4
Low
High
Z
5
Low
Z
High
6
Z
Low
High
*Reset is the state after exiting sleep or spindle brake mode.
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