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CONSTELLATION ES.1 SAS PRODUCT MANUAL, REV. G 21
Note. See table notes on the next page.
[1] Measured with average reading DC ammeter.
[2] Instantaneous +12V current peaks will exceed these values.
[3] Power supply at nominal voltage. N (number of drives tested) = 6, 35 Degrees C ambient.
[4] For +12 V, a –10% tolerance is allowed during initial spindle start but must return to ±5% before reaching 7200 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.
[5] See +12V current profile in Figure 3.
[6] This condition occurs after OOB and Speed Negotiation completes but before the drive has received the Notify Spinup primitive.
[7] See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response.
[8] Operating condition is defined as random 8 block reads.
[9] During idle, the drive heads are relocated every 60 seconds to a random location within the band from three-quarters to maximum
track.
Table 4 500GB drive (Standard & SED model) DC power requirements
Notes
3.0Gb mode 6.0Gb mode
(Amps) (Amps)
Voltage +5V +12V [4] +5V +12V [4]
Regulation [5] ±5% ±5% [2] ±5% ±5% [2]
Avg idle current DC
X [1] [7] 0.36 0.21 0.36 0.21
Advanced idle current
Idle_A 0.36 0.21 0.36 0.21
Idle_B 0.25 0.19 0.25 0.19
Idle_C/ Standby_Y 0.25 0.11 0.25 0.12
Standby_Z 0.25 0.02 0.26 0.02
Transition current
Idle_A - Active 0.62 1.48 0.64 1.42
Idle_B - Active 0.62 1.32 0.70 1.35
Idle_C - Active 0.66 2.04 0.84 2.05
Standby - Active 0.88 2.46 0.86 2.53
Maximum starting current
(peak DC) DC 3s [5] 0.61 1.92 0.61 1.93
(peak AC) AC 3s [5] 0.83 2.53 0.96 2.59
Delayed motor start (max) DC 3s [1] [6] 0.44 0.02 0.44 0.02
Peak operating current (random read):
Typical DC
X [1] [6] 0.44 0.37 0.44 0.38
Maximum DC 3s [1] 0.44 0.39 0.50 0.41
Maximum (peak) DC 3s 1.18 1.48 1.29 1.45
Peak operating current (random write)
Typical DC
X 0.54 0.28 0.54 0.29
Maximum DC 3s 0.59 0.31 0.59 0.41
Maximum (peak) DC 3s 1.32 1.47 1.32 1.47
Peak operating current (sequential read)
Typical DC
X 0.77 0.20 0.77 0.20
Maximum DC 3s 0.84 0.21 0.84 0.21
Maximum (peak) DC 3s 1.07 0.40 1.07 0.43
Peak operating current (sequential write)
Typical DC
X 0.95 0.20 0.95 0.20
Maximum DC 3s 1.01 0.21 1.01 0.21
Maximum (peak) DC 3s 1.40 0.38 1.38 0.38