SPSB100 datasheet(34/214 Pages) STMICROELECTRONICS

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•

A fault on one of the regulators occurred and its REGFAIL_GO_REC configuration bit is set to 1.

•

FBB pin voltage falls below its power down threshold.

SPSB100 enters in RECOVERY-2 state from ACTIVE state and generates status register bit

REC2_FROM_DO_POWER_CYCLE = 01 in case of DO_POWER_CYCLE SPI command (only after

SPI_PROTECT_ACCESS has been set) REC2_FROM_DO_POWER_CYCLE can be cleared by

CLR_REC2_FROM_DO_POWER_CYCLE bit.

SPSB100 enters in RECOVERY-2 state from RECOVERY-1 state and generates status register bit

FSM_TO_REC2 = 1 in case of:

•

DO_POWER_CYCLE SPI command (only after SPI_PROTECT_ACCESS has been set).

•

The temperature of the central sensor overpassed the TSDC threshold.

•

A fault on one of the regulators occurred and its REGFAIL_GO_REC configuration bit is set to 1.

•

8 consecutive WD trigger faults.

•

FBB pin voltage falls below its power down threshold.

SPSB100 enters in RECOVERY-2 state from RECOVERY-1 state and generates status register bit

REC2_FROM_DO_POWER_CYCLE = 1X in case of DO_POWER_CYCLE SPI command (only after

SPI_PROTECT_ACCESS has been set) REC2_FROM_DO_POWER_CYCLE can be cleared by

CLR_REC2_FROM_DO_POWER_CYCLE bit.

When entering RECOVERY-2 state:

•

The NFSO1 output is asserted low.

•

FCCU monitoring is turned OFF.

•

NRST is asserted low and regulators are turned off according to the programmed power-down sequence.

•

In case of a TSD event the TSD counter is incremented and SPSB100 waits that the temperature cools

down.

From RECOVERY-2 state SPSB100 transits to DEEP-SLEEP state for unrecoverable fault, or to INIT state to

power-up again.

3.6.3.8

DEEP-SLEEP state - Unrecoverable faults

SPSB100 enters in DEEP-SLEEP state from ACTIVE-FULL-POWER mode or REC-1 states in case of:

•

DO_POWER_DOWN SPI command (only after SPI_PROTECT_ACCESS has been set).

•

Power ground lost.

SPSB100 enters in DEEP-SLEEP state from RECOVERY-1 state in case of:

•

DO_POWER_DOWN SPI command (only after SPI_PROTECT_ACCESS has been set).

•

Power ground lost.

•

15 consecutive WD trigger faults.

SPSB100 enters in DEEP-SLEEP state from RECOVERY-2 state in case of:

•

The temperature of one sensor overpassed the TSD threshold and the TSD counter (TSD_CNT_FAIL)

reached 3.

•

The counter of regulator (REG_FAIL_CNT) fail events reached 3.

When entering the DEEP-SLEEP state from ACTIVE or RECOVERY-1 states:

•

The NFSO1 output is asserted low.

•

FCCU monitoring is turned OFF.

•

NRST is asserted low and regulators are turned off according to the programmed power-down sequence.

SPSB100 remains in a DEEP-SLEEP state until a wake-up event occurs. The design of SPSB100 has been

optimized to offer a very-low power consumption while being wake-able by external events.

DEEP-SLEEP state is also entered:

•

In case of hardware low-level error, refer to the Section 4.8: HW low-level monitors for details.

•

From INIT state in case of safety check error, refer to the Section 4.17: Safety checks for details.

•

In case of repetitive power-up fault, refer to the Section 3.6.2.3: Power-up fault management.

SPSB100

Functional description

DS14640 - Rev 1

page 34/214

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