The SMH4042A is a fully integrated hot swap controller that
provides complete power control for add-in cards ranging in
use for basic hot swap systems to high availability
CompactPCI systems. It detects proper insertion of the
card and senses valid supply voltage levels at the
backplane. Utilizing external low on-resistance N-channel
MOSFETs, card power is ramped by two high-side driver
outputs that are slew-rate limited at 250V/s.
The SMH4042A continuously monitors the host supplies,
the add-in card supplies and the add-in card current. If
the SMH4042A detects the current is higher than the
programmed value it will shut down the MOSFETs and
issue a fault status back to the host.
The internal 512 × 8 E2PROM can be used as configuration
memory for the individual card or as general purpose
memory. The proprietary Data Download mode provides
a more direct interface to the E2PROM, simplifying
access by the add-in card’s controller or ASIC.
Programming of configuration, control and calibration
values by the user can be simplified with the interface
adapter and Windows GUI software obtainable from
2070 9.1 5/27/03
SUMMIT MICROELECTRONICS, Inc.