ZHCSCW1G September 2014 – January 2017 ISO7340C , ISO7340FC , ISO7341C , ISO7341FC , ISO7342C , ISO7342FC
PRODUCTION DATA.
- 1 特性
- 2 應用
- 3 說明
- 4 修訂歷史記錄
- 5 說明 （續）
- 6 Pin Configuration and Functions
-
7 Specifications
- 7.1 Absolute Maximum Ratings
- 7.2 ESD Ratings
- 7.3 Recommended Operating Conditions
- 7.4 Thermal Information
- 7.5 Power Ratings
- 7.6 Insulation Specifications
- 7.7 Safety-Related Certifications
- 7.8 Safety Limiting Values
- 7.9 Electrical Characteristics—5-V Supply
- 7.10 Supply Current Characteristics—5-V Supply
- 7.11 Electrical Characteristics—3.3-V Supply
- 7.12 Supply Current Characteristics—3.3-V Supply
- 7.13 Switching Characteristics—5-V Supply
- 7.14 Switching Characteristics—3.3-V Supply
- 7.15 Insulation Characteristics Curves
- 7.16 Typical Characteristics
- 8 Parameter Measurement Information
- 9 Detailed Description
- 10Application and Implementation
- 11Power Supply Recommendations
- 12Layout
- 13器件和文檔支持
- 14機械、封裝和可訂購信息
10 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.
10.1 Application Information
The ISO734x family of devices use single-ended TTL-logic switching technology. The supply voltage range is from 3 V to 5.5 V for both supplies, VCC1 and VCC2. When designing with digital isolators, keep in mind that because of the single-ended design structure, digital isolators do not conform to any specific interface standard and are only intended for isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data controller (that is, μC or UART), and a data converter or a line transceiver, regardless of the interface type or standard.
10.2 Typical Application
10.2.1 Isolated Data Acquisition System for Process Control
The ISO734x family of devices combined with Texas Instruments' precision analog-to-digital converter and mixed signal micro-controller can create an advanced isolated data acquisition system as shown in Figure 20.
Figure 20. Isolated Data-Acquisition System for Process Control
10.2.1.1 Design Requirements
Unlike optocouplers, which require external components to improve performance, provide bias, or limit current, the ISO734x family of devices only requires two external bypass capacitors to operate.
10.2.1.2 Detailed Design Procedure
10.2.1.2.1 Typical Supply Current Equations
For the equations in this section, the following is true:
- ICC1 and ICC2 are typical supply currents measured in mA
- f is data rate measured in Mbps
- CL is the capacitive load measured in pF
10.2.1.2.1.1 ISO7340x
At VCC1 = VCC2 = 5 V:
At VCC1 = VCC2 = 3.3 V:
10.2.1.2.1.2 ISO7341x
At VCC1 = VCC2 = 5 V:
At VCC1 = VCC2 = 3.3 V:
10.2.1.2.1.3 ISO7342x
At VCC1 = VCC2 = 5 V:
At VCC1 = VCC2 = 3.3 V:
Figure 21. Typical ISO7340x Circuit Hook-up
Figure 23. Typical ISO7342x Circuit Hook-up
Figure 22. Typical ISO7341x Circuit Hook-up
10.2.1.3 Application Curves
The typical eye diagrams of the ISO734x family of devices indicate low jitter and a wide open eye at the maximum data rate of 25 Mbps.
Figure 24. Eye Diagram at 25 Mbps, 5 V and 25°C
Figure 25. Eye Diagram at 25 Mbps, 3.3 V and 25°C
10.2.2 Typical Application for Module With 16 Inputs
The ISO7341x device and several other components from Texas Instruments can be used to create an isolated serial peripheral interface (SPI) for input module with 16 inputs.
Figure 26. Isolated SPI for an Analog Input Module With 16 Inputs
10.2.2.1 Design Requirements
Refer to Isolated Data Acquisition System for Process Control for the design requirements.
10.2.2.2 Detailed Design Procedure
Refer to Isolated Data Acquisition System for Process Control for the detailed design procedures.
10.2.2.3 Application Curves
Refer to Isolated Data Acquisition System for Process Control for the application curves.
10.2.3 Typical Application for RS-232 Interface
Typical isolated RS-232 interface implementation is shown in Figure 27.
Figure 27. Isolated RS-232 Interface
10.2.3.1 Design Requirements
Refer to Isolated Data Acquisition System for Process Control for the design requirements.
10.2.3.2 Detailed Design Procedure
Refer to Isolated Data Acquisition System for Process Control for the detailed design procedures.
10.2.3.3 Application Curves
Refer to Isolated Data Acquisition System for Process Control for the application curves.