SLVSE46A November 2017 – January 2018 TPS65680
In BOOT state the logic core is reset and default values are loaded from non-volatile memory. BOOT state is entered upon VIN rising above the UVLODVDD threshold. No other input voltages are required at this stage. The I2C interface is not responsive, i.e. it does not send an ACK when addressed while in BOOT state. After the boot phase is completed, the state machine advances to STANDBY state.