Ampro Corporation MightyBoard 821 Power and Sleep States, Optional CPU Fan, Optional System Fan

Chapter 3			Hardware
Table 3-12. ATX Power Supply Interface Pin/Signal Descriptions (J2) (Continued)
	13, 15	GND	Ground line
	14	PS-On	Power Supply On – This signal turns on and off the ATX power supply.
	16, 17	GND	Ground line
	18	NC	Not connected (-5.0 volts)

Note: The shaded area denotes power or ground.

Optional CPU Fan

The MightyBoard 821 has an optional CPU fan connector for those environmental situations where customers may require it.

Table 3-13. Optional CPU Fan Interface Pin/Signal Descriptions (J12)

Pin #	Signal	Description
1	DET	Fan Speed Detect – This is the fan speed tachometer signal.
2	+12	+12 volts DC +/- 5%
3	GND	Ground

Note: The shaded area denotes power or ground.

Optional System Fan

The MightyBoard 821 has an optional system fan connector for those environmental situations where customers may require it.

Table 3-14. Optional System Fan Interface Pin/Signal Descriptions (J22)

Pin #	Signal	Description
1	DET	Fan Speed Detect – This is the fan speed tachometer signal.
2	+12	+12 volts DC +/- 5%
3	GND	Ground

Note: The shaded area denotes power or ground.

Power and Sleep States

The following information only applies to the MightyBoard 821, if an ATX power supply is used to provide power. If a non-ATX power supply is used, then the MightyBoard 821 is only controlled by the Power-On/Off switch on the power supply and the various sleep states are not available.

Power-On Switch

The Power-On switch turns the MightyBoard 821 and its attached power supply to a fully On condition, if you are using an ATX power supply. Normally, if the operating system (OS) supports sleep states, the OS will turn off the MightyBoard 821 and its power supply during the OS shut down process. If the OS supports sleep states, the Power-On button will also transition the MightyBoard 821 and its power supply between a fully Powered On state, various sleep states depending on the OS control setting, and a fully Powered Off state. If the OS does not support sleep states, then the Power-On button only turns power on or off to the MightyBoard 821.

The sleep states are OS dependent and not available if your OS does not support power management based on the ACPI standard. An OS supporting ACPI will allow the Power-On button to be configured through a user interface.

28 Reference Manual MightyBoard 821