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SI9993CS датащи(PDF) 15 Page - Vishay Siliconix

номер детали SI9993CS
подробное описание детали  12-V VCM/Spindle Motor Driver for Large Capacity HDD
PDF  16 Pages
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производитель  VISHAY [Vishay Siliconix]
домашняя страница  http://www.vishay.com
Logo VISHAY - Vishay Siliconix

SI9993CS датащи(HTML) 15 Page - Vishay Siliconix

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Si9993CS
Vishay Siliconix
FaxBack 408-970-5600, request 70653
S-60752–Rev. A, 05-Apr-99
www.siliconix.com
15
REG4
(xx1xxxx)
Driver Controls
D7/D6
Tblank(on)
PWM On-Time Blanking Pulse Adjust (FSYSCLK = 5 MHz)
“00”
=
1.4 µs
“01”
=
1.8 µs
“10”
=
0.6 µs
“11”
=
1.0 µs
D5/D4
Tblank(off)
PWM Off-Time Blanking Pulse Ratio:
“00”
=
⁷⁄₈ (80 to 88%) of Selected PWM Off-Time
“01”
=
¾ (80 to 88%) of Selected PWM Off-Time
“10”
=
½ (80 to 88%) of Selected PWM Off-Time
“11”
=
³⁄₈ (80 to 88%) of Selected PWM Off-Time
D3
VCMsr
VCM Output Slew Rate Control Option:
“0”
=
No slew rate limit at outputs -->
T(p-ch) = T(n-ch)
≤ 0.1 µs
“1”
=
Slew rate limit enabled -->
T(p-ch) = T(n-ch)
≈ 1 µs
D2/D1
SPINsr
Spindle Output Slew Rate Control Select:
“00”
=
No slew rate limit at outputs -->
T(p-ch) = T(n-ch)
≤ 0.1 µs
“01”
=
Slew rate limit enabled -->
T(p-ch) = 0.5 x T(SRADJ)
T(n-ch) = T(SRADJ)
“10”
=
Slew rate limit enabled -->
T(p-ch) = T(SRADJ)
T(n-ch) = 0.5 x T(SRADJ)
“11”
=
Slew rate limit enabled -->
T(p-ch) = T(SRADJ)
T(n-ch) = T(SRADJ)
Note: T(SRADJ) = Rise or fall time set by resistor at SRADJ pin.
D0
QCOM
Quiet Commutation (low torque ripple) Option
REG5
(x1xxxxx)
Spindle
Command
D7/D6
Spindle Control
Spindle Motor Enable/Disable Control:
“00”
=
Spindle amplifiers unbiased and state machines reset. Spindle output drivers in tri-state.
“01”
=
Spindle amplifiers unbiased and state machines reset. Spindle motor brake always on.
“10”
=
All amplifiers unbiased and state machines reset. Motor shutdown sequence
commences with tri-state output for a period of Tvcmdly, followed by spindle brake. Note
this command will force a head retract, but will not affect the content of REG0.
“11”
=
Spindle drivers fully enabled for normal operation.
D5/D4
Gmsel(spin)
Spindle Transconductance Select (A/V):
“11”
=
1.60
“10”
=
0.80
“01”
=
0.40
“00”
=
0.10
D3
Direct PWM
STEPCLK Pin Function Select:
“1”
=
Direct PWM Input (steady running state only)
“0”
=
Start-up step clock
D2/D1
(F/I)tsample
Commutation F/I Sample Time:
“00”
=
FCOM/12
400 ns
“01”
=
FCOM/38
133 ns
“10”
=
FCOM/102
50 ns
“11”
=
FCOM/128
40 ns
D0
(F/I)spdup
F/I Speed-Up Circuit Select:
“0”
=
On
“1”
=
Off
TABLE 2. Serial Port Definitions (Register Address = A6A5A4A3A2A1A0) (Continued)
Register
Bit No.
Name
Function



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