Control Signals - Sun Microsystems Sun Ultra 60 Service Manual

C.2.1

Control Signals

With the exception of the PowerOn signal, all power supply control signals are at
TTL signal levels. Table C–9 lists these control signal values.
TABLE C–9
Parameter
V (high-level output voltage)
OH
V (low-level output voltage)
OL
V (high-level input voltage)
IH
V (low-level input voltage)
IL
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.
Turning the System Unit On
The system unit can be turned on in the following ways:
4 Keyboard switch
4 Set the TOD timer to wake-up at a given time
4 Power switch on front of system
Turning the System Unit Off
The system unit can be turned off in the following ways:
Sun Ultra 60 Service Manual ♦ March 1999, Revision A
C-34
Power Supply Control Signal
Min Max
2.4 Vdc
0.4 Vdc
2.0 Vdc
0.8 Vdc