Good afternoon,
I'm encountering an issue with the TJA1103A ethernet transceiver when attempting to put it into sleep mode.
Starting with the electrical setup, the ETH PHY's VDDIO, VREGD_IN, VDD_CORE, and VREGA_IN are linked to buck converters, which I can deactivate. However, VDDAO_AO remains connected to a constant power source.
The INH pin and wakeup logic is clearly related to the always on supply domain. According to the datasheet's WISE_CONTROL register (Rev. 0.10 — 8 August 2022), the INH pin is naturally high "as long as the device has power." Consequently, I've turned off all the buck converters, cutting power to all the aforementioned domains except for VDDA_AO. The INH line, however, remains high.
I have two questions:
1. What does the term "device is powered" specifically mean? I assumed it relates to the non-permanent supply voltages and expected it to drop once the power is disconnected.
2. Assuming that turning off the power while maintaining the constant VDD is sufficient, what could be another reason for the INH pin to stay high?
Thanks,
Alessandro.
