Seagate 15K.3 ST373453FC Model Product Manual PDF - Page 32
Cheetah 15K.3 FC Product Manual, Rev. D, Conducted noise immunity, Power sequencing, Current
UPC - 000004165019
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22 Cheetah 15K.3 FC Product Manual, Rev. D 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. 0 to 100 kHz 100 kHz to 10 MHz +5V 150mV 100mV +12V 150mV 100mV 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 ST373453FC, ST336753FC, and ST318453FC models are shown below in the following 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 ST373453FC drive +12V current profile