SLYT834 March   2023 ISOUSB211

 

  1. 1 Introduction
  2. 2 Existing implementation of OTG USB applications
  3. 3  On-the-go operation
  4. 4 Implementation of isolated OTG
  5. 5 Demonstration of OTG with ISOUSB211 EVM
  6. 6 Scenario A: Isolated OTG module connected to a USB-drive (bus-powered)
  7. 7  Scenario B: Isolated OTG module connected to a laptop (host)
  8. 8 Demonstration
  9. 9 Connect phone to laptop
  10. 10Connect phone to USB-drive
  11. 11Summary

7 Scenario B: Isolated OTG module connected to a laptop (host)

ID pin connected to the isolated OTG module (B-device) is floating, and is transmitted through the reverse channel of ISO6721 as a high. OTG module retains the status of the VBUSON to low, which retains the turned off state of switch as the host connected is self-powered. V2OK goes high as soon as the connect is established given that the host is self-powered and the pull-ups are initiated as per the USB2.0 standard.