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Chapter 3
Hardware
ReadyBoard 910
Reference Manual
35
Power On
The signals on this header allow the ATX power supply to be turned off (soft off) from the ReadyBoard 910
by operating system (OS) control. However, if you use a non-ATX power supply, then you will not have the
soft off feature for sleep states normally provided by ATX power supplies. Use the JP4 jumper to select
Power On options (S3/S5).
provides the pin signal names and descriptions of the Power On
interface, which provides a 3-pin shrouded header with 0.049" (1.25mm) pitch
Note:
The shaded table cells denote power or ground. The signals marked with * indicate the signal is
Active Low.
Power-On Button
The Power-On button turns the ReadyBoard 910 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 ReadyBoard 910 and its power supply during the OS shut down process. If the OS supports sleep
states, the Power-On button will also transition the ReadyBoard 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 on or off power to the
ReadyBoard 910.
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.
The Power-On button is provided externally by connecting a momentary button to the Power-On button
header (JP6). See
Fan Interfaces
The ReadyBoard 910 provides two headers for system and CPU fans, as required.
and
define the pin signals for the CPU and System fan interfaces, which provide single-row, 3-pin headers with
0.100" (2.54 mm) pitch.
Table 3-18. Power On Header Pin Signal Descriptions (CN1)
Pin #
Signal
Description
1
VCC5
+5V Voltage – This voltage (refer to ATX Specification 2.2 or later for
minimum requirement) is supplied from the ATX power supply and is required
for normal operation and sleep states.
2
GND
Ground
3
PS_ON*
Power Supply On – This signal is sent to the ATX power supply from the
ReadyBoard 910 to turn on the ATX power supply. This signal can also be used
to turn off the ATX power supply or go into a suspended or standby state.
Table 3-19. Power-On Button Interface Pin Signal Descriptions (JP6)
Pin #
Signal
Description
1
+3.3
+3.3 volts DC +/- 5%
2
GND Ground
Table 3-20. CPU Fan Interface Pin Signal Descriptions (FN1)
Pin #
Signal
Description
1
FAN1_TACH
Fan Speed Detect – This is the fan speed tachometer signal.
2
+12
+12 volts DC +/- 5%
3
FN1_PWM
Modulation – This signal controls the fan speed.