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O E M FUNCTIONAL SPECIFICATION ULTRASTAR XP (DFHC) SSA MODELS 1.12/2.25 GB - 1.0" H I G H
2.2.3 C4x Models
The following voltage specifications apply at the drive power connector. There is no special power on/off
sequencing required. The extra power needed for Brick On Sled models and the + 3 8 V power option are
described in 2.2.4, "CxB Models" on page 33.
Input Voltage
+ 5 Volts Supply
+ 1 2 Volts Supply
The following current values are the combination measured values of SCSI models and SSA Cx4 model. The
differences between SCSI and SSA is + 5 V currents. Because of different interface electronics and speed, SSA
electronics card requires more + 5 V current than SCSI.
Average is 500 ma higher. (290ma and 500ma differences were found by measuring SSA Cx4 model). SSA
+ 5 V current numbers are derived from SCSI + 5 V current numbers by adding 290ma and 500ma accord-
ingly.
Power Supply Current
+ 5 V D C (power-up)
+ 5 V D C (idle avg)
+ 5 V D C (R/W baseline)
+ 5 V D C (R/W pulse)
+ 1 2 V D C (power-up)
+ 1 2 V D C (idle avg)
+ 1 2 V D C (seek avg)
+ 1 2 V D C (seek peak)
+ 1 2 V D C (spin-up)
Drive power
Avg idle power
Avg R/W power
7
See Figure 7 on page 30 for a plot of how the read/write baseline and read/write pulse sum together.
8
The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 8
on page 31 for a typical buildup of these currents. Refer to examples on the following page to see how to combine
these values.
9
The current at start is the total 12 volt current required (ie. the motor start current, module current and voice coil
retract current). See Figure 9 on page 32 for typical 12 volt current during spindle motor start.
Source filename=POWER
USER RESPONSIBLE F O R VERIFYING VERSION A N D COMPLETENESS
5V (± 5 % during run and spin-up)
12V (± 5 % during run) ( + 5 % / -7% during spin-up)
Notes
Minimum voltage slew rate = 4.5 V/sec
Base-to-peak
Minimum voltage slew rate = 7.4 V/sec
1 op/sec
8.5 sec max
30 ops/sec
IBM Corporation
Read/Write Base Line is 290 ma higher. Idle
Population
Population
Mean
Stand. Dev.
1.26 Amps
0.02 Amps
1.27 Amps
7
0.05 Amps
.36 Amps
0.06 Amps
0.77 Amps
0.03 Amps
0.0036 Amps
0.0002 Amps
8
1.3 Amps
0.02 Amps
2.2 Amps
9
0.1 Amps
15.54 Watts
.44 Watts
16.91 Watts
.44 Watts
Page 27 of 87
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