PWRS-0026 User Manual
Page 11 of 19
B. UPS Option
The UPS option provides battery backup, up to 5 minutes, in
order to allow the operating system to safely shut down upon
a power failure. This system consists of two major
components:
LOGIC
is a mezzanine board to the PS card. It contains
cPCI backplane connections through J1 and J5. J1 is used
for PCI interface to the HOST, and J5 is used for power
signal transition between the battery and the charger, and
also used to route the control signal for power sequence
between HOST and UPS control when in serial handshake
mode.
BACKUP
is a cPCI card which is inserted from the back
side of the cage behind the second slot and contains the
battery and serial port handshake connector.
C. Functionality
The UPS provides backup power during a power loss. The
logic is dependent upon the driver installed. A driver for
serial handshake and for a full PCI mode is available. In
either case, a charge circuit continually monitors the battery
and provides charging when needed. The charge point has
built in hysteresis. During a standard operating system
shutdown, the UPS is not activated. During power loss, a
shutdown under battery power is completed.
