The ACTIVE_TO_WARM sequence can be triggered by
either a watchdog or ESM_MCU error. In the event of a trigger, the nRSTOUT and nRSTOUT_SOC
signals are driven low and the recovery count (register RECOV_CNT_REG_1) increments. Then,
all BUCKs and LDOs are reset to their default voltages. The PMICs remain in the ACTIVE
state.
Note: GPIOs do not reset during the sequence as shown in Figure 6-4.
At the beginning of the sequence the
following instructions are
executed:
//TPS6594141B
// Set FORCE_EN_DRV_LOW
REG_WRITE_MASK_IMM ADDR=0x82 DATA=0x08 MASK=0xF7
// Clear nRSTOUT and nRSTOUT_SOC
REG_WRITE_MASK_IMM ADDR=0x81 DATA=0x00 MASK=0xFC
// Increment the recovery counter
REG_WRITE_MASK_IMM ADDR=0xa5 DATA=0x01 MASK=0xFE
Note: The watchdog or ESM error is an indication of a significant error which has taken
place outside of the PMIC. The PMIC does not actually transition through the safe recovery
as with an MCU_POWER_ERR, however, in order to maintain consistency all of the regulators
are returned to the values stored in NVM and the recovery counter is incremented. If the
recovery counter exceeds the recovery count threshold the PMICs stay in the safe recovery
state.
Note: After the ACTIVE_TO_WARM sequence the MCU is responsible for managing the EN_DRV and
recovery counter. At the end of the sequence the 'FORCE_EN_DRV_LOW' bit is cleared so that
the MCU can set the ENABLE_DRV bit.
Figure 6-4 ACTIVE_TO_WARM Sequence
Note: The regulator transitions do not represent enabling of the regulators but the time at
which the voltages are restored to their default values. Since this sequence originates
from the ACTIVE state all of the regulators are on.