SPRT813 December 2025 ISOM8110-Q1
PRODMIX
Figure 1 Isolated Wake
Circuit for Automotive Digital Audio Bus Using
ISOM8113-Q1Design Considerations
- [FAQ] What is an Opto-emulator? | [FAQ] Opto-Emulator FAQ's | [FAQ] What are the benefits?
- Allows for low-cost, isolated, relay weld detection OBC systems
- Performance upgrade from traditional optocouplers; allows tight CTR performance with no LED aging.
- Introduction to Opto-Emulators
- Opto-emulators explained: Why you should upgrade your optocoupler technology
- Upgrade photoMOS, SSR and Push-Pull, Totem-Pole, or Transistor Output Optocouplers With Opto-emulators
Need additional assistance? Ask our engineers a question on the TI E2E™ Isolation Support Forum.
Recommended Parts
| Catalog Part Number |
Automotive Part Number | Input Type | Output Type | VF (MAX) | CTR |
|---|---|---|---|---|---|
| ISOM8110 | ISOM8110-Q1 | DC Input | Open-collector / transistor output | 1.4V | 100% to 155% |
| ISOM8111 | ISOM8111-Q1 | 1.4V | 150% to 230% | ||
| ISOM8112 | ISOM8112-Q1 | 1.4V | 255% to 380% | ||
| ISOM8113 | ISOM8113-Q1 | 1.4V | 375% to 560% |
To find a pin-to-pin
alternative to the optocouplers in your design, search TI’s cross reference tool.
For more opto-emulators, browse
through the online parametric
tool.
Resistor selection
R1 limits the amount of current flowing into the opto-emulator input and outputs a wake-up signal when the Digital Audio Bias Negative and Positive lines have an active signal (ABIASN and ABIASP). IF min is 0.7mA, therefore the input current can be 1mA to allow for input sufficient margin. Therefore, R1 needs to satisfy:
R2 limits the maximum output current IC max and is set according to the current and voltage needed at enable. For more information, please see [FAQ] ISOM8110: How do I design ISOM8110 to have the best timing performance for switching applications?