Linear Technology 461A-A Quick Start Manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 461A-A&B
DESCRIPTION
Demonstration circuit 461A-A is a circuit board
which demonstrates an application of the
LTC®1644CGN Compact PCI Hot Swap Con-
troller. DC 461A-B simulates the backplane of
a Compact PCI Bus system. Together the demo
boards demonstrate the Hot Swap controller
and how it allows a board to be safely inserted
or removed from an active (powered) Compact
PCI (CPCI) bus slot. In addition to demonstrat-
ing the Hot Swap capability, the DC461A also
demonstrates the ability of the LTC1644CGN to
monitor, control and protect the +5, +3.3, +12
and -12 volt power supplies, and bias the I/O
pins for minimal disruption during card insertion
and extraction.
External N-channel transistors control the
3.3V/5V supplies, while on-chip switches con-
trol the –12V and 12V supplies. The 3.3V and
Arrow.com.
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COMPACT PCI BUS HOT SWAP CONTROLLER & SYSTEM BACKPLANE
5V supplies can be ramped up at a program-
mable rate. Electronic circuit breakers protect
all four supplies against overcurrent faults. The
PWRGD output indicates when all of the supply
voltages are within tolerance. The OFF/ON pin
is used to cycle the board power or reset the
circuit breaker. The PRECHARGE output can
be used to bias the bus I/O pins during card in-
sertion and extraction. PCI_RST# is combined
on-chip with HEALTHY# in order to generate
LOCAL_PCI_RST#.
Design files for this circuit board are available.
Call the LTC factory.
, LTC and LT are registered trademarks of Linear Technology Cor-
poration
LTC1644CGN
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