Seagate ST32430N Product Manual - Page 27

Product Manual - Hawk 2LP Family SCSI-2 Volume 1, Rev. A, Power sequencing, V - current profile,

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Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A 19 7.2.2 Power sequencing The drive does not require power sequencing. The drive protects against inadvertent writing during power up and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper termination of the peripheral I/O cables. 7.2.3 12 V - current profile Figure 7.2.2-1 identifies the drive +5 V and +12 V current profile. The current during the various times is as shown: T -Power is applied to the drive. T1 -Controller self tests are performed. T2 -Spindle begins to accelerate under current limiting after performing drive internal diagnostics. See Note 1 of Table 7.2-1. T3 -The spindle is up to speed and the Head-Arm restraint is unlocked. T4 -The heads move from the landing zone to the data area. T5 -The adaptive calibration sequence is performed. T6 -Calibration is complete and the drive is ready for reading and writing. Note. All times and currents are typical. See Table 7.2-1 for maximum current requirements. 2.5 T1 2.0 T3 T4 T2 T5 T6 1.5 12V Current (amps) 1.0 0.5 0 2 4 6 8 10 12 14 16 18 20 Seconds 0.8 0.6 5V Current (amps) 0.4 0.2 0 2 4 6 8 10 12 14 16 18 20 Seconds Figure 7.2.2-1. Typical Hawk 2LP family drive +5 V and +12 V current profile

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16
20
0
2
4
6
8
10
Seconds
Seconds
12
14
16
18
0.2
0.4
0.6
5V
Current
(amps)
0.8
20
T1
T2
T3
0
2
4
6
8
10
12
14
18
0.5
1.0
1.5
12V
Current
(amps)
2.0
2.5
T6
T4
T5
Product Manual - Hawk 2LP Family SCSI-2 (Volume 1), Rev. A
19
_____________________________________________________________________________________
7.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power up
and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper
termination of the peripheral I/O cables.
7.2.3
12 V - current profile
Figure 7.2.2-1 identifies the drive +5 V and +12 V current profile. The current during the various times is as
shown:
T
-Power is applied to the drive.
T1 -Controller self tests are performed.
T2 -Spindle begins to accelerate under current limiting after performing drive internal diagnostics. See Note
1 of Table 7.2-1.
T3 -The spindle is up to speed and the Head-Arm restraint is unlocked.
T4 -The heads move from the landing zone to the data area.
T5 -The adaptive calibration sequence is performed.
T6 -Calibration is complete and the drive is ready for reading and writing.
Note.
All times and currents are typical. See Table 7.2-1 for maximum current
requirements.
Figure 7.2.2-1. Typical Hawk 2LP family drive +5 V and +12 V current profile