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SI9993CS 数据表(PDF) 14 Page - Vishay Siliconix

部件名 SI9993CS
功能描述  12-V VCM/Spindle Motor Driver for Large Capacity HDD
PDF  16 Pages
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制造商  VISHAY [Vishay Siliconix]
网页  http://www.vishay.com
标志 VISHAY - Vishay Siliconix

SI9993CS 数据表(HTML) 14 Page - Vishay Siliconix

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Si9993CS
Vishay Siliconix
S-60752–Rev. A, 05-Apr-99
FaxBack 408-970-5600, request 70653
14
www.siliconix.com
TABLE 2. Serial Port Definitions (Register Address = A6A5A4A3A2A1A0)
Register
Bit No.
Name
Function
REG0
(xxxxxx1)
VCM Command
D7/D6
VCM Control
VCM Enable/Disable Control:
“00”
=
All VCM amplifiers unbiased except those of current sense. VCM output drivers in
tri-state.
“01”
=
All VCM amplifiers unbiased except those of current sense. VCM brake always on.
“10”
=
All VCM amplifiers unbiased except those of current sense. Motor shutdown sequence
commences with head brake for a period of Tvcmdly, followed by head retract for a
period of Tspindly. The VCM returns to tri-state thereafter. Note that this command has
no effect on the spindle motor operation, or the content of REG5.
“11”
=
VCM fully enabled for normal operation.
D5/D4
Gmsel(vcm)
VCM Transconductance Select (A/V):
“11”
=
1.60
“10”
=
0.80
“01”
=
0.40
“00”
=
0.10
D3/D2
VPWMsel
VCM Output State Linear/Constant Frequency PWN Select:
“00”
=
Output operates as a class AB, linear amplifier
“01”
=
Output operated in PWM voltage mode at 31.25 kHz
“10”
=
Output operated in PWM voltage mode at 62.5 kHz
“11”
=
Output operated in PWM voltage mode at 125 kHz
D1/D0
OPEN
OPEN
REG1
(xxxxx1x)
Powerdown
D7/D6
Vretract
Head Retract Voltage Limit:
“11”
=
0.4 V
“10”
=
0.7 V
“01”
=
1.0 V
“00”
=
1.2 V
D5/D4
Tvcmdly
VCM Head Retract Delay Time (from power-down detection or command):
“11”
=
Zero Delay
“10”
=
4 ms
“01”
=
8 ms
“00”
=
16 ms
D3/D2
Tspindly
Spindle Brake Delay Time (from power-down detection or command, tvcmdly included):
“11”
=
Zero Delay
“10”
=
144 ms
“01”
=
192 ms
“00”
=
384 ms
D1/D0
VSPBRK
Spindle Brake Threshold Voltage Select (VCLAMP Detect):
“11”
=
3 V
“10”
=
4 V
“01”
=
5 V
“00”
=
Immediate Brake
REG2
(xxxx1xx)
Production
Test Only
D7 Thru D0
FCOM Pin Configuration Option:
“00000000”
=
FCOM (default)
“10000000”
=
FCOM/6
All other combinations are for testing only, no user programmable parameter is available.
REG3
(xxx1xxx)
Spindle
Controls
D7 Thru D2
Vth1
Spindle Commutation Delay Adjust in Sign-Magnitude:
The value programmed controls the motor commutation delay, in electrical degree,
from the last BEMF zero crossing via a 6-bit DAC. Each LSB corresponds to ½
electrical degree.
“011111”
=
7.5° Delay
:=
:
“010000”
=
0° Neutral
:=
:
“000001”
=
7.5° Advance
“000000”
=
8° Advance,
“100000”
=
8° Advance
“100001”
=
8.5° Advance
:=
:
“110000”
=
16° Advance
:=
:
“111111”
=
23.5° Advance
D1/D0
Tspinpwm
Spindle Constant Off-Time (fSYSCLK = 5 MHz):
“11”
=
13 µs
“10”
=
6.6 µs
“01”
=
3.4 µs
“00”
=
1.8 µs



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