Conducted Noise Immunity; Power Sequencing; Current Profiles; Figure 2. Typical St973401Fc Drive +12V Current Profile - Seagate Savvio 10K Product Manual

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.
+5V
100 hz to 20 Mhz 250mV
100 hz to 8 Khz
8 Khz to 20 Khz
20 Khz to 5 Mhz
6.2.2

Power sequencing

The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
6.2.3

Current profiles

The +12V and +5V current profiles for the ST973401FC and ST936701FC models are shown below in the fol-
lowing figures.
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 2 for maximum current requirements.

Figure 2. Typical ST973401FC drive +12V current profile

Savvio FC Product Manual, Rev. D
+12V
800 mVpp
450 mVpp
250 mvpp
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