Power Supply
VSBC-8 Reference Manual
Reference
–
17
P
OWER
R
EQUIREMENTS
The VSBC-8 requires only +5 volts (±5%) for proper operation. The voltage required for the RS-
232 ports and analog input sections are generated with a DC/DC converter. A variable low-
voltage supply circuit provides power to the CPU and other on-board devices.
The exact power requirement of the VSBC-8 depends on several factors, including memory
configuration, CPU speed, peripheral connections, type and number of expansion modules, and
attached devices. For example, PS/2 keyboards typically draw their power directly from the
VSBC-8, and driving long RS-232 lines at high speed can increase power demand.
L
ITHIUM
B
ATTERY
Warning!
To prevent shorting, premature failure, or damage to the lithium battery, do not
place the board on a conductive surface such as metal, black conductive foam, or
the outside surface of a metalized ESD protective pouch. The lithium battery may
explode if mistreated. Do not recharge, disassemble, or dispose of in fire. Dispose
of used batteries promptly.
Normal battery voltage should be at least 3.0V. If the voltage drops below 3.0V, contact the
factory for a replacement (part number T-HB3/5-
3
). Life expectancy under normal use is
approximately 10 years.
Note!
The VSBC-8 is designed to boot even with a dead or removed battery. See page 20
for further information.
