22
Savvio 15K.2 SAS Product Manual, Rev. C
[1] Measured with average reading DC ammeter. Instant12V current peaks will exceed these val-
ues. Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[2] For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching
15k RPM. The ±5% must be maintained after the drive signifies that its power-up sequence has been
completed and that the drive is able to accept selection by the host initiator.
[3] See +12V current profile in Figure 1.
[4] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the
Notify Spinup primitive.
[5] See paragraph 6.2.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
[6] Operating condition is defined as random 8 block reads.
[7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from
three-quarters to maximum track.
Table 3:
ST973452SS
& ST973352SS DC power requirements
Notes
3.0 Gbit mode
6.0 Gbit mode
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DC
[1] [7]
0.36
0.18
0.37
0.18
Maximum starting current
(peak DC) DC
3
σ
[3]
0.51
1.09
0.51
1.08
(peak AC) AC
3
σ
[3]
0.93
1.73
0.99
1.86
Delayed motor start (max) DC
3
σ
[1] [4]
0.56
0.06
0.57
0.05
Peak operating current: (random read)
Typical DC
[1] [6]
0.45
0.36
0.46
0.36
Maximum DC
3
σ
[1]
0.47
0.37
0.48
0.37
Maximum (peak) DC
3
σ
1.16
1.16
1.14
1.16
Peak operating current: (random write)
Typical DC
[1]
0.52
0.28
0.53
0.28
Maximum DC
3
σ
[1]
0.55
0.28
0.56
0.28
Maximum (peak) DC
3
σ
1.14
1.18
1.16
1.20
Peak operating current: (sequential read)
Typical DC
[1]
0.88
0.18
0.89
0.18
Maximum DC
3
σ
[1]
0.92
0.19
0.93
0.19
Maximum (peak) DC
3
σ
1.18
0.40
1.20
0.42
Peak operating current: (sequential write)
Typical DC
[1]
0.88
0.18
0.89
0.18
Maximum DC
3
σ
[1]
0.94
0.19
0.95
0.19
Maximum (peak) DC
3
σ
1.16
0.40
1.18
0.40
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