Chapter 3
Hardware
ReadyBoard 910
Reference Manual
31
Miscellaneous
Real Time Clock (RTC)
The ReadyBoard 910 contains a Real Time Clock (RTC). The CMOS RAM is backed up with a Lithium
Battery. If the battery is not present, a battery-free boot option in the BIOS completes the boot process and
resets the clock to the default date and time.
External Battery
An external battery input connection is provided through the battery connector (CN12) for an external
battery. The external battery is used to power the Real Time Clock. ADLINK provides a small 3.3 volt
battery, adhered to the board and connected to the external battery header.
Note:
The shaded table cells denote power or ground.
External Beeper/Buzzer Interface
The Beeper/Buzzer signals from the PCH are fed to Beeper/Buzzer header through an OR circuit in
conjunction with +5V to drive an external PC speaker. The signal is also fed to the on-board Audio CODEC
to provide a PC Beep/Buzz signal for the Line Out connections.
Note:
The shaded table cell denotes power.
Clear CMOS Switch
This momentary push-button switch (SW1) clears CMOS memory.
System Reset Switch
This momentary push-button switch (SW2) invokes a hard reset.
27
P5V_S
+5 Volts Power Standby
28
P5V_S
+5 Volts Power Standby
29
P5V_S
+5 Volts Power Standby
30
P5V_S
+5 Volts Power Standby
Note:
The shaded table cells denote power or ground.
Table 3-11. External Battery Interface Pin Signal Descriptions (CN12)
Pin #
Signal
Description
1
PVBAT
+3.3 Volts Power
2
GND
Ground
Table 3-12. External Beeper/Buzzer Interface Pin Signal Descriptions (JP5)
Pin #
Signal
Description
1
BUZZ_BEEP
Speaker Output – This signal drives an external PC Beeper/Buzzer
speaker.
2
P5V_S
+5 Volt Standby
Table 3-10. EXT Interface Pin Signal Descriptions (CN9) (Continued)
Pin #
Signal
Description