SMH4042A

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 SMH4042A 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.

SMH4042A Programming of configuration, control and calibration values by the user can be simplified with the interface adapter and Windows GUI software obtainable from Summit Microelectronics.