Seagate ST336607FC 用户手册
20
Cheetah 10K.6 FC Product Manual, Rev. B
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 start-
ing current must be available to each device.
power requirements should be noted. Where multiple units are powered on simultaneously, the peak start-
ing 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.
6.2.1
Conducted noise immunity
Noise is specified as a periodic and random distribution of frequencies covering a band from DC to 10 MHz.
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power
connector.
Maximum allowed noise values given below are peak-to-peak measurements and apply at the drive power
connector.
6.2.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
and down.
6.2.3
Current profiles
Figures 3, 4 and 5 identify the drive +12V current profiles for each model ST3146807FC, ST3733307FC and
ST336607FC, respectively. The current during the various times is as shown:
ST336607FC, respectively. The current during the various times is as shown:
T0
Power is applied to the drive.
T1
Controller self-tests are performed.
T2
Spindle begins to accelerate under current limiting after performing internal diagnostics.
T3
Spindle is up to speed and the Head-Arm restraint is unlocked.
Note: All times and currents are typical. See Table 1 for maximum current requirements.
Figure 3.
Typical ST3146807FC drive +12V current profile
+5V
+12V
0 to 100 kHz
150mV
150mV
100 kHz to 10 MHz
100mV
100mV