Conducted Noise Immunity; Power Sequencing - Seagate Elite 9 Product Manual

Elite 9 Product Manual, Rev. C
7.2.1
7.2.2
continued from previous page
[10] Operating condition is defined as a third-stroke seek at OD and read
one track. A command is issued every 100 msec.
[11] No terminator power. See Section 11.7.3.4.
[12] All power-saving features enabled.
[13] Seeking is defined as a third-stroke seek at OD. A command is issued
every 23 msec.
[14] Read track is defined as repeat reads of track 15 with an 88% duty cycle.
[15] Operating condition is defined as a third-stroke seek at OD and read
one track. A command is issued every 60 msec for ST410800W drives
and every 72 msec for ST410800WD drives.
[16] Read track is defined as repeat reads of track 15 with a 45% duty cycle
at 00.

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's power
connector.
With spindle
motor not running
+ + + + + 5V + + + + + 12V
100mV 100mV

Power sequencing

The drive does not require power sequencing. The drive protects against
inadvertent writing during power-up and down. Daisy-chain operation re-
quires that power be maintained on the terminated device to ensure proper
termination of the peripheral I/O cables.
The Start Command option and Spinup Delay option jumpers determine
when the drive will spin up. The following three options are available:
• Spin up when the Start Unit command is received
• Spin up immediately when power is applied
• Delay spin-up based on the target ID (SCSI ID)
To automatically delay motor start based on the target ID (SCSI ID), attach
a jumper connecting pins 1 and 2 on the J4B connector. See Section 10.1 for
additional information about this option.
With spindle
motor running
+ + + + + 12V
330mV
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