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| 型号： | SI8400AB-B-IS |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 18/34页 |
| 文件大小： | 0K |
| 描述： | IC ISOLATOR BIDIR I2C 8-SOIC |
| 视频文件： | Digital Isolation Overview Digital Isolators vs. Optocouplers |
| 标准包装： | 96 |
| 输入 - 1 侧/2 侧： | 2/2 |
| 通道数： | 2 |
| 电源电压： | 3 V ~ 5.5 V |
| 电压 - 隔离： | 2500Vrms |
| 数据速率： | 10Mbps |
| 输出类型： | 开路漏极 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
| 配用： | 336-1765-ND - KIT EVAL FOR SI84XXISO |
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Si840x
4. Typical Application Overview
4.1. I 2 C Background
In many applications, I 2 C, SMBus, and PMBus interfaces require galvanic isolation for safety or ground loop
elimination. For example, Power over Ethernet (PoE) applications typically use an I 2 C interface for communication
between the PoE power sourcing device (PSE), and the earth ground referenced system controller. Galvanic
isolation is required both by standard and also as a practical matter to prevent ground loops in Ethernet connected
equipment.
The physical interface consists of two wires: serial data (SDA) and serial clock (SCL). These wires are connected
to open collector drivers that serve as both inputs and outputs. At first glance, it appears that SDA and SCL can be
isolated simply by placing two unidirectional isolators in parallel, and in opposite directions. However, this
technique creates feedback that latches the bus line low when a logic low asserted by either master or slave. This
problem can be remedied by adding anti-latch circuits, but results in a larger and more expensive solution. The
Si840x products offer a single-chip, anti-latch solution to the problem of isolating I 2 C/SMBus applications and
require no external components except the I 2 C/SMBus pull-up resistors. In addition, they provide isolation to a
maximum of 2.5 kV RMS , support I 2 C clock stretching, and operate to a maximum I 2 C bus speed of 1.7 Mbps.
4.2. I 2 C Isolator Operation
Without anti-latch protection, bidirectional I 2 C isolators latch when an isolator output logic low propagates back
through an adjacent isolator channel creating a stable latched low condition on both sides. Anti-latch protection is
typically added to one side of the isolator to avoid this condition (the “A” side for the Si8400/01/02/05).
The following examples illustrate typical circuit configurations using the Si8400/01/02/05.
I2C/SMBus
Unit 1
Si8400/01/02/05
+
V IL
V OL
-
V IL
ISO1
I 2 C/SMBus
Unit 2
V OL
ISO2
Figure 15. Isolated Bus Overview (Bidirectional Channels)
The “A side” output low (V OL ) and input low (V IL ) levels are designed such that the isolator V OL is greater than the
isolator V IL to prevent the latch condition.
18
Rev. 1.6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SI8400AB-B-ISR | 功能描述:隔离器接口集成电路 2.5 kV Bidirectional I2C Isolator 1.7MHz RoHS:否 制造商:Texas Instruments 通道数量:2 传播延迟时间: 电源电压-最大:5.5 V 电源电压-最小:3 V 电源电流:3.6 mA 功率耗散: 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:SOIC-8 封装:Tube |
| SI-8400L | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type with Coil |
| SI-8401 | 制造商:SANKEN 制造商全称:Sanken electric 功能描述:Separate Excitation Switching Type with Coil |
| Si8401AA-B-IS | 功能描述:隔离器接口集成电路 1.0 kV Bidirectional I2C Isolator 1.7MHz RoHS:否 制造商:Texas Instruments 通道数量:2 传播延迟时间: 电源电压-最大:5.5 V 电源电压-最小:3 V 电源电流:3.6 mA 功率耗散: 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:SOIC-8 封装:Tube |
| SI8401AA-B-ISR | 功能描述:隔离器接口集成电路 1kV Bidirect I2C Iso 1.7MHz ADuM RoHS:否 制造商:Texas Instruments 通道数量:2 传播延迟时间: 电源电压-最大:5.5 V 电源电压-最小:3 V 电源电流:3.6 mA 功率耗散: 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:SOIC-8 封装:Tube |
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