欢迎访问ic37.com |
会员登录 免费注册
发布采购

SMH4814SR04 参数 Datasheet PDF下载

SMH4814SR04图片预览
型号: SMH4814SR04
PDF下载: 下载PDF文件 查看货源
内容描述: 双路馈电有源或门可编程热插拔控制器 [Dual Feed Active-ORing Programmable Hot Swap Controller]
分类和应用: 控制器
文件页数/大小: 44 页 / 926 K
品牌: SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
 浏览型号SMH4814SR04的Datasheet PDF文件第9页浏览型号SMH4814SR04的Datasheet PDF文件第10页浏览型号SMH4814SR04的Datasheet PDF文件第11页浏览型号SMH4814SR04的Datasheet PDF文件第12页浏览型号SMH4814SR04的Datasheet PDF文件第14页浏览型号SMH4814SR04的Datasheet PDF文件第15页浏览型号SMH4814SR04的Datasheet PDF文件第16页浏览型号SMH4814SR04的Datasheet PDF文件第17页  
SMH4814  
Preliminary Information  
APPLICATIONS INFORMATION  
CHASSIS  
CARD  
100k  
RD  
General Purpose EEPROM  
The SMH4814 has 256 bytes of general-purpose  
EEPROM memory available to the user. These 2k-  
bits of EEPROM are accessible via the I2C interface at  
slave address 1010 or 1011, beginning at word  
address 0 (0x000) and ending at word address 255  
(0x0FF). Refer to the I2C 2-Wire Serial Interface  
section for more information.  
-48V Ret  
PD1  
Configuration Registers  
SMH4814  
PD0  
-48V A  
-48V B  
There are also 20 user-programmable, non-volatile  
configuration registers on the SMH4814. The  
configuration registers are accessible via the IIC  
interface at the same slave address as the general  
purpose EEPROM, beginning at word address 256  
(0x100) and ending at address 271 (0x113). These  
locations will be referred to throughout this document  
as registers R00 through R13. Individual bits or  
ranges of bits will be further denoted with square  
brackets. For example, R00[3:0] refers to Register  
0x100, bits 3 through 0. R0D[6,2] refers to Register  
0x10D, bits 6 and 2. The configuration registers are  
responsible for setting all of the programmable  
parameters described within this document. Refer to  
the Configuration Register Tables for more detailed  
information about all the register settings.  
100k  
Short Pins  
Figure 8 - PD1 and PD0 Inputs, Physical Offset  
Two shorter pins, arranged at opposite ends of the  
connector, force the card to be fully seated before both  
pin detects are enabled. It is important to use limiting  
resistors (typically 100k to 1M) in series with the PD  
inputs to avoid damaging them. An internal shunt  
prevents the voltage on those pins from reaching  
unsafe levels.  
Pin Detection  
The PD inputs may be disabled using R0F[2];  
however, even if the Pin Detect inputs are disabled or  
tied directly to 5V, the device must still wait a pin  
detect delay period before starting up. The pin detect  
delay (tPDD) timing parameter is controlled by bits  
R00[3:0]. Refer to Register R00 and R0F for detailed  
programming information.  
There are several enabling inputs that allow the host  
to control the SMH4814. The Pin Detect signals (PD1  
and PD0) are two active high enables that are  
generally used to indicate that the add-in circuit card is  
properly seated. These inputs must be held high for a  
pin-detect delay period of tPDD before a power-up  
sequence may be initiated. This is typically done by  
clamping the inputs to 5v through the implementation  
of an ejector switch, or alternatively through the use of  
staggered pins at the card-cage interface.  
EN/TS Input  
The EN/TS input provides an active high comparator  
input that may be used as a master enable or  
temperature sense input. This input signal must  
exceed 2.5V to enable the FET turn-on sequence. If  
EN/TS drops below the 2.5V sense level, the device  
may be configured to set the FAULT# output or not,  
and initiates either a Forced Shutdown or Power Down  
sequence. These options are set using R0D[6,2].  
Summit Microelectronics, Inc  
2080 2.0 07/21/05  
13