Summit Microelectronics - Applications Note 29

Tech Support: Applications Note 29
SMH4804 -48V Programmable Hot Swap Sequencing Power Controller Windows GUI Users Guide and Configuration Register Descriptions

Application Note 29

1 2 3 4 5 6 7 8 9

10 11 12 13 14 15 16 17 18

SPECIAL NOTE: The HTML version of the application note has been divided into multiple pages to follow the PDF version. You may use the menu here to jump to any of the other pages. You may also download/view the entire application note in PDF format [PDF format].

SMH4804 - Windows GUI Users Guide and Configuration Register Descriptions

PAGE 17

Register R0C - Nonvolatile fault latch (NVFL) setting, I²C power on/off
This register is not a configuration register, but rather a nonvolatile fault latch (NVFL). If a circuit breaker fault condition is detected and the NVFL is enabled (Register 5, Bit 3 cleared), bit 0 of Register C is automatically set (written with a logic '1') when the circuit breaker trips. So long as the bit remains set, the SMH4804 is not able to drive VGATE or the PG[4:1]# outputs. The host or service center must access the register and clear the bit (write a '0') once the fault condition has been resolved. The bit can also be used as a nonvolatile Power on/off control to power the SMH4804 and system through the I²C bus.

Figure 16 - Register R0C Windows GUI

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.