Seagate BARRACUDA 4LP ST34571N/W/WC/WD/DC Manual descargar pdf (Pagina 30)

20 Barracuda 4LP 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 con-

nector.

6.2.2 Power sequencing

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

and down. Daisy-chain operation requires that power be maintained on the terminated drive to ensure proper

termination of the peripheral I/O cables. To automatically delay motor start based on the target ID (SCSI ID)

enable the Delay Motor Start option and disable the Enable Motor Start option on the J2 connector. See Sec-

tion 8.1 for pin selection information. To delay the motor until the drive receives a Start Unit command, enable

the Enable Motor Start option on the J2 connector.

6.2.3 12 V - Current profile

Figure 3 identifies the drive +5 V and +12 V current profile. The current during the various times is as shown:

Note. All times and currents are typical. See Table 2 for maximum current requirements.

Figure 3. Typical Barracuda 4LP family drive +5 V and +12 V current profile

+5 V = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

+12 V = 150 mV pp from 0 to 100 kHz and 100 mV pp from 100 kHz to 10 MHz.

T - Power is applied to the drive.

T1 - Controller self tests are performed.

T2 - Spindle begins to accelerate under current limiting after performing drive internal

diagnostics. See Note 1 of Table 2.

T3 - The heads move from the landing zone to the data area.

T4 - The adaptive servo calibration sequence is performed.

T5 - Calibration is complete and the drive is ready for reading and writing.

0.0 2 4 6 8 10 12 14 16

0.0

0.5

1.0

1.5

2.0

2.5

3.0

TIME

(

seconds

)

Component

1.0

+5V

Current

(amps)

+12V

Current

(amps)

5V GND

T1 T2 T4

Nominal

(average)

DC curve

12V GND

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 93 94

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