User Guide • SC3-LARGO • CompactPCI
®
Serial CPU Board • Intel
®
Core
TM
5xxx Processor
SC3-LARGO w. Coin Cell Holder
Real-Time Clock
The SC3-LARGO has a time-of-day clock and 100-year calendar, integrated into the QM87 PCH. A
battery on the board supplies the clock circuitry whenever the computer main power is turned off.
The SC3-LARGO uses a holder to retain a BR2032 lithium coin cell, giving an autonomy of more than
5 years. Under normal conditions, replacement should be superfluous during lifetime of the board.
Alternately a leaded BR2032 battery can be soldered directly to the board for increased ruggedness,
or if the SC3-LARGO PCB shall be coated.
In applications were the use of a battery is not permitted, a SuperCap can be soldered instead of the
battery.
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