USER RESPONSIBLE F O R V E R I F Y I N G VERSION A N D COMPLETENESS
O E M F U N C T I O N A L SPECIFICATION ULTRASTAR X P (DFHC) SSA M O D E L S 1.12/2.25 GB - 1.0" H I G H
2.2.2 C2x 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
5V (± 5 % during run and spin-up)
+ 1 2 Volts Supply
12V (± 5 % during run) ( + 5 % / -7% during spin-up)
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.
Read/Write Base Line is 290 ma higher. Idle
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.
Population
Population
Power Supply Current
Notes
Mean
Stand. Dev.
+ 5 V D C (power-up)
Minimum voltage slew rate = 4.5 V/sec
+ 5 V D C (idle avg)
1.23 Amps
0.02 Amps
+ 5 V D C (R/W baseline)
1.25 Amps
4
0.05 Amps
+ 5 V D C (R/W pulse)
Base-to-peak
.36 Amps
0.06 Amps
+ 1 2 V D C (power-up)
Minimum voltage slew rate = 7.4 V/sec
+ 1 2 V D C (idle avg)
0.41 Amps
0.02 Amps
+ 1 2 V D C (seek avg)
1 op/sec
0.0031 Amps
0.0002 Amps
+ 1 2 V D C (seek peak)
1.20 Amps
5
0.02 Amps
+ 1 2 V D C (spin-up)
4.2 sec max
1.5 Amps
6
0.1 Amps
Drive power
Avg idle power
11.07 Watts
.35 Watts
Avg R/W power
30 ops/sec
12.25 Watts
.35 Watts
4
See Figure 4 on page 24 for a plot of how the read/write baseline and read/write pulse sum together.
5
The idle average and seek peek should be added together to determine the total 12 volt peak current. See Figure 5
on page 25 for a typical buildup of these currents. Refer to examples on the following page to see how to combine
these values.
6
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 6 on page 26 for typical 12 volt current during spindle motor start.
Source filename=POWER
IBM Corporation
Page 21 of 87
