If the LM3645 enters a fault condition, the device sets the appropriate flag in the Volt_Fault_Reg and Therm_Fault_Reg Registers (0x15 and 0x16), and places the device into standby by clearing the Dx_EN Bits ([3:0]) in CTRL_REG2 (0x01). The LM3645 remains in standby until an I²C read of the fault registers is completed. Upon clearing the flags/faults, the device can be restarted (Flash, Torch, IR, etc.). If the fault is still present, the LM3645 re-enters the fault state and enters standby again. When a fault flag bit is present in either of the fault registers, the D_MODE register (0x02) becomes read only.