Chapter 3
Hardware
LittleBoard 800
Reference Manual
35
Miscellaneous
Real Time Clock (RTC)
The LittleBoard 800 contains a Real Time Clock (RTC). The BIOS (CMOS) RAM is backed up with a
Lithium Battery. If the battery is not present, the BIOS has a battery-free boot option to complete the boot
process.
Temperature Monitoring
The ADM1023 performs CPU temperature monitoring. This device has an input connection from the
thermal diode in the Intel Celeron M or Pentium M CPU. The SMBus is connected to a dedicated thermal
alert pin in the ADM1023 and the other devices on the SMBus.
Oops! Jumper (BIOS Recovery)
The Oops! jumper is provided in the event the BIOS settings you have selected prevent you from booting the
system. By using the Oops! jumper you can prevent the current BIOS settings in the EEPROM from being
loaded, forcing the use of the default settings. Connect the DTR pin to the RI pin on serial port 1 (COM 1)
prior to boot up to prevent the present BIOS settings from loading. After booting with the Oops! jumper in
place, remove the Oops! jumper and go into BIOS Setup. Change the desired BIOS settings, or select the
default settings, and save changes before rebooting the system.
To convert the Serial A interface to an Oops! jumper, short together the DTR (7) and RI (8) pins on Serial A
(J11) header for Serial Port 1. As an alternate, short the equivalent pins, 4 and 9, on the Serial Port 1 DB9
connector as shown in
Figure 3-2
.
Figure 3-2. Oops! Jumper Connection
Serial Console
The LittleBoard 800 supports the serial console (or console redirection) feature. This I/O function is
provided by an ANSI-compatible serial terminal, or the equivalent terminal emulation software running on
another system. This can be very useful when setting up the BIOS on a production line for systems that are
not connected to a keyboard and display.
NOTE
The LittleBoard 800 requires a heatsink for both Celeron M CPUs and a
heatsink for the Pentium M CPU below 70
°
C.
Serial A Interface (J11)
for Serial Port 1
(or COM1 Port)
1
2
3
4
5
6
7
8
9
10
20
19
Top View
5
4
3
2
1
9
8
7
6
Standard DB9 Serial
Port Connector (Female)
Rear View
Or
Summary of Contents for LitleBoard 800
Page 1: ...LittleBoard 800 Single Board Computer Reference Manual P N 5001816B Revision A ...
Page 6: ...Contents vi Reference Manual LittleBoard 800 ...
Page 22: ...Chapter 2 Product Overview 16 Reference Manual LittleBoard 800 ...
Page 44: ...Chapter 3 Hardware 38 Reference Manual LittleBoard 800 ...
Page 48: ...Appendix A Technical Support 42 Reference Manual LittleBoard 800 ...
