Seagate ST9900805SS Savvio 10K.4 FC Product Manual - Page 30

General DC power requirement notes., Conducted noise immunity, Power sequencing

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[4] See +12V current profile in Figure 4. [5] This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start Motor command. [6] See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and transient response. [7] Operating condition is defined as random 8 block reads. [8] During idle, the drive heads are relocated every 30 seconds to a random location within the band from three-quarters to maximum track General DC power requirement notes. 1. Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current shown. 2. The +5V and +12V supplies should employ separate ground returns. 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 starting current must be available to each device. 4. Parameters, other than spindle start, are measured after a 25-minute warm up. 5. No terminator power. 6.3.1 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. +5 V = +12 V = 250 mV pp from 0 to 100 kHz to 20 MHz. 800 mV pp from 100 Hz to 8 KHz. 450 mV pp from 8 KHz to 20 KHz. 250 mV pp from 20 KHz to 5 MHz. 6.3.2 Power sequencing The drive does not require power sequencing. The drive protects against inadvertent writing during power-up and down. 24 Savvio 10K.4 FC Product Manual, Rev. A

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24
Savvio 10K.4 FC Product Manual, Rev. A
[4]
See +12V current profile in Figure 4.
[5]
This condition occurs when the Motor Start option is enabled and the drive has not yet received a Start
Motor command.
[6]
See paragraph 6.3.1, "Conducted noise immunity." Specified voltage tolerance includes ripple, noise, and
transient response.
[7]
Operating condition is defined as random 8 block reads.
[8]
During idle, the drive heads are relocated every 30 seconds to a random location within the band from
three-quarters to maximum track
General DC power requirement notes.
1.
Minimum current loading for each supply voltage is not less than 1.2% of the maximum operating current
shown.
2.
The +5V and +12V supplies should employ separate ground returns.
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
starting current must be available to each device.
4.
Parameters, other than spindle start, are measured after a 25-minute warm up.
5.
No terminator power.
6.3.1
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.
6.3.2
Power sequencing
The drive does not require power sequencing. The drive protects against inadvertent writing during power-up
and down.
+5 V
=
250 mV pp from 0 to 100 kHz to 20 MHz.
+12 V
=
800 mV pp from 100 Hz to 8 KHz.
450 mV pp from 8 KHz to 20 KHz.
250 mV pp from 20 KHz to 5 MHz.