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L7200 Datasheet(PDF) 18 Page - STMicroelectronics

Part # L7200
Description  MOZART, 12V DISK DRIVE SPINDLE & VCM, POWER & CONTROL "COMBO?
PDF  23 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7200 Datasheet(HTML) 18 Page - STMicroelectronics

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L7200
18/23
BIT
LABEL
DESCRIPTION
5
RETDIR
Retract Direction.
“0” VCM- high, VCM+ low. “1” VCM- low, VCM+ high.
6
RETRACT
“1” Retracts the Voice Coil arm.
7
RETBRK
“1” Brakes the VCM for the first 20mS of the retract time then it reverses
the direction of the retract opposite to the RETDIR bit setting for other
20mS, then it finish the normal retract. This total 40mS are
subtructed from the programmed Retract time.
Reg:
13
Name:
Voice Coil Set-Up and Ramp Loading Register
Type:
Write only
Address: DEh
BIT
LABEL
DESCRIPTION
0
VCMCAL0
VCM Calibration. First Bit.
Bit 3
Bit2
Bit 1
Bit 0
Adj
1
VCMCAL1
VCM Calibration. Second Bit.
0
0
0
0
None
2
VCMCAL2
VCM Calibration. Third Bit.
0
0
0
1
1.4mV
3
VCMCAL3
VCM Calibration. Fourth Bit.
0
0
1
0
2.8mV
00
1
1
4.2mV
01
0
0
5.6mV
01
0
1
7.0mV
01
1
0
8.4mV
01
1
1
9.8mV
10
0
0
11.2mV
10
0
1
12.6mV
10
1
0
14.0mV
10
1
1
15.4mV
11
0
0
16.8mV
11
0
1
18.2mV
11
1
0
19.6mV
11
1
1
21.0mV
4
VCMCALDIR
VCM Calibration Direction. “0” Positive offset. “1” Negative offset.
5
RAMPLOADING
VCM Ramp Loading Setting. “1” Ramp Loading mode.
6
SAMPLE/HOLD
VCM Ramp Loading Setting. “0” Hold. “1” Sampling.
7
TRISTATE
VCM Ramp Loading Setting. “1” Synchronusly clamps the VCM outputs until
current is less than 100mA, then tristate them.
INTERNAL REGISTERS DEFINITION (continued)



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