Power Delivery Considerations; Lithium Battery - VersaLogic Iguana VL-EPIC-25 Reference Manual

P D
OWER ELIVERY
Using the VersaLogic approved power supply (VL-PS200-ATX) and power cable (VL-CBR-
2022) will ensure high quality power delivery to the board. Customers who design their own
power delivery methods should take into consideration the guidelines below to ensure good
power connections.
Also, the specifications for typical operating current do not include any off-board power usage
that may be fed through the VL-EPIC-25 power connector. Expansion boards and USB devices
plugged into the board will source additional power through the VL-EPIC-25 power connector.

Do not use wire smaller than 18 AWG. Use high quality UL 1007 compliant stranded
wire.

The length of the wire should not exceed 18".

Avoid using any additional connectors in the power delivery system.

The power and ground leads should be twisted together, or as close together as possible
to reduce lead inductance.

A separate conductor must be used for each of the power pins.

All power input pins and all ground pins must be independently connected between the
power source and the power connector.

Implement the remote sense feature on your power supply if it has one. Connect the
remote sense lines in tandem with one of the power input and ground pins. This is done
at the connector to compensate for losses in the power wires.
Use a high quality power supply that can supply a stable voltage while reacting to widely varying
current draws.
L B
ITHIUM 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 +3V. If the voltage drops below +2V, contact the
factory for a replacement (part number HB3/0-1). The life expectancy under normal use is
approximately 10 years. Battery voltage can be monitored on the
screen.
Storage temperature affects the life of the battery. The on-board Real-Time Clock (RTC)
continues to draw power even when the Iguana is powered off. The following graph shows that
battery life improves when the board is stored at a lower temperature.
VL-EPIC-25 Reference Manual
C
ONSIDERATIONS
System Features
H/W Monitor BIOS setup
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