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[FAQ] [H] Isolated Interfaces - Top Questions, Answered

Kenneth Arnold
Expert 8030 points

Quickly find solutions to common questions about isolated interface devices by clicking this link. This FAQ answers the most common questions asked about these devices …… ……… …

FAQ: Isolation >> Isolated Interfaces

Digital Isolators Isolated Interfaces Transformer Drivers
Opto-Emulators

I2C Isolators:

  1. [FAQ] Why is the logic LOW level output voltage, VOL1, up to 0.8V on Side 1 of the ISO1540 and ISO1541 bidirectional I2C isolators?
  2. [FAQ] ISO1640: Why are the maximum load capacitance and load current ratings for Side 1 of the ISO1640/ISO1641 less than Side 2?
  3. [FAQ] Can I connect two unidirectional channels on digital isolators to achieve a bidirectional channel for I2C communication?
  4. [FAQ] What are the recommended logic HIGH and LOW voltage levels that can be applied to the isolated I2C devices, ISO1540 and ISO1541?
  5. [FAQ] What is the current consumption of the isolated I2C devices, ISO1540 and ISO1541?

RS-485 Isolated Transceivers:

  1. [FAQ] How do you generate isolated power for an isolated RS-485 node?
  2. [FAQ] How do you configure a RS485 Full-duplex transceiver as Half-duplex?
  3. [FAQ] What kind of transient protection do you need with isolated RS-485 devices?
  4. [FAQ] What is the relationship between cable length and data rate for TI's isolated RS-485 transceivers?
  5. [FAQ] When is isolating an RS-485 bus necessary?
  6. [FAQ] What is the speed vs. length correlation for isolated RS-485?

Isolated Digital Inputs:

  1. [FAQ] How do you isolate multiple digital input channels with limited board space?
  2. [FAQ] How do you provide an LED status indicator with ISO121x digital input receiver devices?
  3. [FAQ] How do you set current limits and voltage thresholds in your system using digital input modules?

Isolated USB:

  1. [FAQ] ISOUSB111: Can I use ISOUSB111 as a replacement device for ADuM3160 / ADuM4160?
  2. [FAQ] ISOUSB211: I would like to order ISOUSB111 or ISOUSB211 samples, but they are out of stock on TI website. Is there any other way I can still order these parts?