Tool/software:
The datasheet of TCAN1043A updated the condition how Sleep Mode transfer to Normal Mode.
The control signal is different between toggling nSTB or EN.
Our design was only having nSTB under control. Could you explain where the change came from? Did it change from earlier version parts?
Hi Jin,
Thanks for reaching out about TCAN1043A on E2E!
The physical device nSTB functionality did not change between datasheet revisions. The latest datasheet revision (2023) is just more accurately reflecting how to change modes (particularly exiting Sleep mode with EN and nSTB).
If TCAN1043A is experiencing issues, feel free to share more details about your system, and we can work towards a solution.
Let me know if that answers your question, or if you still need assistance!
Best,
Ethan
Hi Ethan,
Based on Rev C datasheet April 2022, our design VEK280, which is an AMD evaluation board, only had nSTB controlled by processor.
With the statement of latest datasheet, our design can't transfer device from Sleep mode to Normal mode. Any suggestion?
Thanks,
Jin
Hi Jin,
There is one software solution, and there is one hardware solution for this issue since your system can only control nSTB.
The software solution is to prevent the TCAN1043A state machine from ever entering Sleep mode due to the Sleep Wake Error (SWE) timer, which would prevent footnote 5 from occurring. TCAN1043A should not be in Standby mode for longer than 3 minutes for SWE to be avoided:
This can be achieved by making the device switch from Standby -> Normal -> Standby every 3 minutes to avoid setting off the SWE timer. Depending on your system, it could also be possible to minimize Standby mode usage altogether.
If the SWE timer is never triggered, then only nSTB is needed to exit Sleep mode.
The hardware solution is to switch from TCAN1043A to TCAN1043N. The N-version of this device was designed for customers that did not want the SWE feature as it simply removes it: https://www.ti.com/product/TCAN1043N-Q1
With TCAN1043N, there is no risk of SWE being triggered of course, and only nSTB is necessary to exit Sleep mode (assuming EN=high, VIO > UVIO). If this device interests you, let me know and I can email some resources on how to migrate over.
Also note that the image you uploaded is not displaying correctly. If it is giving you trouble, uploading an excel or powerpoint file with the images inserted will always work.
Best,
Ethan
