Sun Microsystems 60 Control Signals, Remote Enable PowerOn and PowerOff, 1.2 On/Off Functionality

TABLE C-8Power Supply Output Values (Continued)

Output	Voltage (Vdc)	Max Current (A)	Regulation Band
3	12.0	6.0	11.65 to 12.60
4	-12.0	0.4	-12.60 to -11.40
5	2.5 to 3.5	25.0	+/- 2%

Note –The combined power of output 1 and output 3 must be less than 300 watts.

C.2.1	Control Signals
	With the exception of the PowerOn signal, all power supply control signals are at
	TTL signal levels. TABLE C-9lists these control signal values.
	TABLE C-9Power Supply Control Signal
	Parameter	Min	Max
	VOH (high-level output voltage)	2.4 Vdc
	VOL (low-level output voltage)		0.4 Vdc
	VIH (high-level input voltage)	2.0 Vdc
	VIL (low-level input voltage)		0.8 Vdc

C.2.1.1 Remote Enable PowerOn and PowerOff

A remote interface can disable the DC outputs with a momentary low signal to the PowerOff input and enable the DC outputs with a momentary low signal to the PowerOn input. Both signals are interfaced to the power supply through the motherboard.

C.2.1.2 On/Off Functionality

The system unit uses a latching relay to remember the state of the power supply. This system uses a momentary On/Off switch and enables other parts of the system (such as software or the keyboard switch) to control the state of power supply.

Appendix C Functional Description C-37