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SMH4802
-48V Programmable Hot Swap Power
Controller Windows GUI Users
Guide and Configuration Register
Descriptions
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Register
R5 - Latch function, FS# pin function.
Register
5 controls the function of the nonvolatile fault
latch and provides general control for the FS#
input. Bit 3 controls the enabling of the
non-volatile latch. Bits 2:0 configure the FS#
input. The FS# pin has the following function: it
can be programmed to act as an auxiliary enable
input controlling the PG# output which in turn can
be used as an event monitor during the power-up
sequence. When programmed as an enable to PG# (any
selection other than 'Function Disabled'), FS#
effectively becomes the enable input for PG#. The
event monitor is generally implemented in
conjunction with a monitoring device on the
secondary side of the DC/DC converters, such as the
SMS44, SMT4004 or SMS64. If FS# is not pulled high
before the programmed condition then the PG# and
VGATE outputs are shut down. As an example, if the
binary value is 110b, VGATE and PG# are shut down
if FS# is not pulled high before tPGD has elapsed
after PG# is true. If a failure occurs due to the
lapse of the event monitor timer, cycling the power
resets the device.
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SUMMIT
Microelectronics, Inc. reserves the right
to make changes to the products contained
in this publication in order to improve
design, performance or reliability. SUMMIT
Microelectronics, Inc. assumes no
responsibility for the use of any circuits
described herein, conveys no license under
any patent or other right, and makes no
representation that the circuits are free
of patent infringement. Charts and
schedules contained herein reflect
representative operating parameters, and
may vary depending upon a user's specific
application. While the information in this
publication has been carefully checked,
SUMMIT Microelectronics, Inc. shall not be
liable for any damages arising as a result
of any error or omission
SUMMIT Microelectronics, Inc. does not
recommend the use of any of its products
in life support or aviation applications
where the failure or malfunction of the
product can reasonably be expected to
cause any failure of either system or to
significantly affect their safety or
effectiveness. Products are not authorized
for use in such applications unless SUMMIT
Microelectronics, Inc. receives written
assurances, to its satisfaction, that: (a)
the risk of injury or damage has been
minimized; (b) the user assumes all such
risks; and (c) potential liability of
SUMMIT Microelectronics, Inc. is
adequately protected under the
circumstances.
Revision 1.0 - This document supersedes
all previous versions and covers Status
Tracking Codes up to 10 and Windows GUI
revision 2.39.3 and later. Please check
the Summit Microelectronics, Inc. web site
at www.summitmicro.com
for data sheet updates.
I2C is a trademark of Philips
Corporation.
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Copyright
© 2003 SUMMIT MICROELECTRONICS, Inc.
Power Management for Communications™
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