Summit Microelectronics - Applications Note 30

Tech Support: Applications Note 30
SMH4804 -48V Programmable Hot Swap Sequencing Power Controller -48V Hot-Swap Controller Features Simple Software I²C Power-On/Off Interface

Application Note 30

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SMH4804 -48V Programmable Hot Swap Sequencing Power Controller

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Introduction

Inrush current-limiting is employed in systems requiring live insertion or removal of printed circuit cards. Telecom systems are particularly sensitive to the live-insertion event, often requiring a fairly sophisticated means of limiting the card's in-rush current, sensing and reacting to undervoltage/overvoltage conditions, etc.

Integrated circuits are rapidly replacing discrete solutions, offering many user-settable or user-programmable features thereby simplifying the circuit design and allowing simple tweaks to compensate for later system modifications or production variances.

Summit Microelectronics SMH4804: Non-Volatile, Quad Hot-Swap Controller

The SMH4804 Hot-Swap Controller monitors, manages and reacts to the printed circuit card's input current, input voltage and enables up to four DC-DC converters. Unlike other integrated circuit solutions, the SMH4804 contains on-board non-volatile EEPROM making it truly user programmable. A unique feature of the SMH4804 allows the part to be shutdown via a simple software command thus allowing system cards to be removed from service during non-peak usage or for maintenance purposes. This same feature brings the system card back 'online' as required.

Configuring the NV Fault Register:

In systems requiring the -48V be shutdown in the event of a fault, the SMH4804 is configured as displayed in Figure 1. Highlight the 'Enabled' selection of the 'Non-Volatile Fault Latch Enable/Disable' dropdown menu and click on the 'Write Config' radio button to enable the internal fault-latching feature (Register 5, bit 3 = '0').

Figure 1 - Configuring the SMH4804 to Record Fault Events.

NOTICE

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 Windows GUI revision 2.3.0 and later. Please check the Summit Microelectronics, Inc. web site at www.summitmicro.com for updates.

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