SAS transmitters and receivers, Power

11.4.6SAS transmitters and receivers

A typical SAS differential copper transmitter and receiver pair is shown in Figure 22. The receiver is AC coupling to eliminate ground shift noise.

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Figure 22. SAS transmitters and receivers

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11.4.7Power

The drive receives power (+5 volts and +12 volts) through the SAS device connector.

Three +12 volt pins provide power to the drive, 2 short and 1 long. The current return for the +12 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.

Three +5 volt pins provide power to the drive, 2 short and 1 long. The current return for the +5 volt power supply is through the common ground pins. The supply current and return current must be distributed as evenly as possible among the pins.

Current to the drive through the long power pins may be limited by the system to reduce inrush current to the drive during hot plugging.

11.5SIGNAL CHARACTERISTICS

This section describes the electrical signal characteristics of the drive’s input and output signals. See Table 17 for signal type and signal name information.

11.5.1Ready LED Out

The Ready LED Out signal is driven by the drive as indicated in Table 18.

Table 18 Ready LED Out conditions

NORMAL COMMAND ACTIVITY		LED STATUS

Ready LED Meaning bit mode page 19h	0		1

Spun down and no activity	Off		Off

Spun down and activity (command executing)	On		On

Spun up and no activity	On		Off

Spun up and activity (command executing)	Off		On

Spinning up or down		Blinks steadily
	(50% on and 50% off, 0.5 seconds on and off for 0.5 seconds)

Format in progress, each cylinder change		Toggles on/off

The Ready LED Out signal is designed to pull down the cathode of an LED. The anode is attached to the proper +3.3 volt supply through an appropriate current limiting resistor. The LED and the current limiting resistor are external to the drive. See Table 19 for the output characteristics of the LED drive signals.

CONSTELLATION ES.3 SAS PRODUCT MANUAL, REV. B

ST1000NM0033 specifications

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In summary, the Seagate ST1000NM0033 is an excellent choice for businesses seeking a reliable, high-capacity HDD with robust performance features. Its combination of speed, efficiency, durability, and capacity positions it as a strong contender in the enterprise storage solutions market. With its extensive feature set, it continues to cater to the demanding needs of modern data centers and enterprise applications.

Seagate ST1000NM0033 SAS transmitters and receivers, Power, Signal Characteristics, Ready LED Out

Models: ST1000NM0033