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參數(shù)資料
| 型號： | SMH4042ASAGN |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Distributed Power Hot-Swap Controller for CompactPCI |
| 中文描述： | 分布式電源熱插拔控制器的CompactPCI |
| 文件頁數(shù)： | 20/28頁 |
| 文件大小： | 1822K |
| 代理商： | SMH4042ASAGN |
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20
SMH4042A
2070 9.1 5/27/03
SUMMIT MICROELECTRONICS, Inc.
I/O Pre-charge
The
CompactPCI
specs require the add-in board to pre-
charge the board’s I/Os before making contact with bus
pins, and sets the pre-charge voltage at 1V ±0.1V. The
SMH4042A provides an accurate 1V reference output that
SPECIAL CONSIDERATIONS
The example application shown in Figure 11 shows both
of the BD_SEL inputs being used independently. These
two inputs are effectively ANDed internally and they must
both be low before any sequencing will proceed. In most
design cases the BD_SEL1# connection to an injector
switch is redundant and realistically can be grounded.
The
CompactPCI
Hot Swap specification does provide a
mechanism for implementing high availability systems
using “Full Hot Swap” boards. This capability entails
integrating the injector/ejector handle, the blue LED and
a board status signal. Section 2.3.2 of the
CompactPCI
Hot Swap specification states the following.
host that either a board has been freshly inserted or is
about to be extracted.”
“A signal (ENUM#) is provided to notify the system
the board, is used to signal the insertion or impending
extraction of a board.”
“A switch, actuated with the lower ejector handle of
is accurate and stable prior to the medium length pins
making contact. The 1VREF output should be the
reference input to a unity gain op amp circuit. Figure 17
is a typical implementation utilizing a common op amp.
Figure 17. I/O Pre-charge Circuit
it is permissible to extract a board.”
“A blue LED, located on the board is illuminated when
Figure 18 illustrates a possible implementation of the
circuits needed. It should be noted this will require a
status register that works in conjunction with the switch
logic to generate the ENUM# signal. Notice the blue LED
circuit and the active high reset output used to activate a
current boost circuit for the LED. The sequence of
operations is as follows:
The long pins engage.
the BD_SEL pull-up resistor.
Power is supplied to the SMH4042A, the LED and
dependent upon the interface operating levels.
V(I/O) is either the early 5V or the early 3V,
going low.
The LED is illuminated by LOCAL_PCI_RST#
+
–
LMV321
2070 Fig17
V
CC
5
1V
REF
SMH4042A
Resistor Array
T
B
Early Power
T
B
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SMH4042AGBKN | Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042AGBGM | Aluminum Polymer SMT Capacitor; Capacitance: 82uF; Voltage: 6.3V; Case Size: 10x12.7 mm; Packaging: Tape & Reel |
| SMH4042AGBGN | Aluminum Polymer SMT Capacitor; Capacitance: 120uF; Voltage: 10V; Case Size: 8x7 mm; Packaging: Tape & Reel |
| SMH4042AGBHM | Aluminum Polymer SMT Capacitor; Capacitance: 150uF; Voltage: 10V; Case Size: 10x8 mm; Packaging: Tape & Reel |
| SMH4042AGBKM | Aluminum Polymer SMT Capacitor; Capacitance: 470uF; Voltage: 6.3V; Case Size: 8x7 mm; Packaging: Tape & Reel |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SMH4042ASAHM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042ASAHN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042ASAKM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042ASAKN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
| SMH4042ASALM | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Distributed Power Hot-Swap Controller for CompactPCI |
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