Seagate ST9900805SS Savvio 10K.1 SAS Product Manual - Page 32

ST973401SS models 2% for ST936701SS models.

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Table 13: ST936701SS DC power requirements ST936701SS 3 Gbit mode Notes (Amps) (Amps) Voltage +5V +12V [2] Regulation [5] ±5% ±5% [2] Avg idle current DCX [1] [7] 1.06 0.18 Maximum starting current (peak DC) DC 3σ [3] 1.19 1.81 (peak AC) AC 3σ [3] 1.42 2.94 Delayed motor start (max) DC 3σ [1] [4] 1.05 0.05 Peak operating current: Typical DCX [1] [6] 1.08 0.47 Maximum DC 3σ [1] 1.09 0.50 Maximum (peak) DC 3σ 1.46 1.46 ST936701SS 1.5 Gbit mode (Amps) (Amps) +5V +12V [2] ±5% ±5% [2] 1.06 0.18 1.19 1.82 1.41 2.93 1.05 0.05 0.98 0.46 0.99 0.47 1.34 1.48 [1] Measured with average reading DC ammeter. Instantaneous +12V current peaks will exceed these values. 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 9,936 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 2. [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 with 295 I/Os per second for ST973401SS drives and 285 I/Os per second for ST936701SS drives. Current and power specified at nominal voltages. Decreasing +5 volt supply by 5% increases 5 volt current by 3.2%. Decreasing +12 volt supply by 5% increases 12 volt current by 2.1% for ST973401SS models (2% for ST936701SS models). [7] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum track. General DC power requirement notes. 1. Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current shown. 2. The +5V and +12V supplies should employ separate ground returns. 3. Where power is provided to multiple drives from a common supply, careful consideration for individual drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak starting current must be available to each device. 4. Parameters, other than spindle start, are measured after a 10-minute warm up. 5. No terminator power. 26 Savvio SAS Product Manual, Rev. D

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26
Savvio SAS Product Manual, Rev. D
[1]
Measured with average reading DC ammeter. Instantaneous +12V 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
9,936 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 2.
[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 with 295 I/Os per second for ST973401SS drives
and 285 I/Os per second for ST936701SS drives. Current and power specified at nominal voltages.
Decreasing +5 volt supply by 5% increases 5 volt current by
3.2%. Decreasing +12 volt supply by 5%
increases 12 volt current by
2.1% for
ST973401SS models (2% for ST936701SS models).
[7]
During idle, the drive heads are relocated every 60 seconds to a random location within the band from
three-quarters to maximum track.
General DC power requirement notes.
1.
Minimum current loading for each supply voltage is not less than 1.7% of the maximum operating current
shown.
2.
The +5V and +12V supplies should employ separate ground returns.
3.
Where power is provided to multiple drives from a common supply, careful consideration for individual
drive power requirements should be noted. Where multiple units are powered on simultaneously, the peak
starting current must be available to each device.
4.
Parameters, other than spindle start, are measured after a 10-minute warm up.
5.
No terminator power.
Table 13:
ST936701SS
DC power requirements
Notes
ST936701SS
3 Gbit mode
ST936701SS
1.5 Gbit mode
(Amps)
(Amps)
(Amps)
(Amps)
Voltage
+5V
+12V [2]
+5V
+12V [2]
Regulation
[5]
±5%
±5% [2]
±5%
±5% [2]
Avg idle current DCX
[1] [7]
1.06
0.18
1.06
0.18
Maximum starting current
(peak DC) DC
3
σ
[3]
1.19
1.81
1.19
1.82
(peak AC) AC
3
σ
[3]
1.42
2.94
1.41
2.93
Delayed motor start (max) DC
3
σ
[1] [4]
1.05
0.05
1.05
0.05
Peak operating current:
Typical DCX
[1] [6]
1.08
0.47
0.98
0.46
Maximum DC
3
σ
[1]
1.09
0.50
0.99
0.47
Maximum (peak) DC
3
σ
1.46
1.46
1.34
1.48