Hi,
a wakeup event on pin WAKE or via the bus, a LOW-to-HIGH transition on pin STBN (provided that VIO is present) or a battery reconnection (PWON flag) lead to reset the undervoltage detection flag UVNOM. Thus the transceiver wakes up (INH switched on) along with trying to ramp up VCC and/or VIO again. If there is still an undervoltage condition on VCC and/or VIO, the transceiver is forced into Sleep Mode again after the undervoltage detection time tdet(uv).
Best regrads,
Ladislav
