SPSB100 datasheet(22/214 Pages) STMICROELECTRONICS

22 / 214 page

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Overtemperature detection by local thermal sensor (flag is TSD_CL4, see also the

Section 4.7: Temperature monitoring) and LDO2 is switched off.

•

After a fault detection (UV, OV, TSD_CL4 or PG timeout), LDO2 can be re

‑enabled by setting LDO2_ENA =

0 followed by LDO2_ENA = 1, even if fail flags are not cleared.

•

LDO2 is switched off if a fault on the track regulator is detected.

•

In active and REC-1 states, when LDO2_REGFAIL_GO_REC is set at 1 in USER-NVM, in case of PG

timeout, OV, UV or TSD events the device executes a power down sequence, enters in REC-2 state and

makes an automatic retry.

3.5

Operating modes

The device can work in a normal operation mode (ACTIVE state - FULL-POWER mode) or in a reduced operation

mode (ACTIVE state - LOW-POWER mode).

The transition between FULL-POWER and LOW-POWER mode is managed by SPI command (LOW_POWER_

SET control bit, only after SPI_PROTECT_ACCESS has been set).

In ACTIVE state the device is fully controllable and configurable through SPI.

Moreover, a DEEP-SLEEP state is available to minimize current consumption during not-operating time frames by

SPI command DO_POWER_DOWN (only after SPI_PROTECT_ACCESS has been set). Status bits DEEP-

SLEEP_FROM_DO_POWER_DOWN will be set at “01” if transition from active state or “1x” if transition from

REC-1 state.

DEEP-SLEEP_FROM_DO_POWER_DOWN can be cleared by

CLR_DEEP_SLEEP_FROM_DO_POWER_DOWN bit.

3.5.1

Wake-up from DEEP-SLEEP to ACTIVE state

A wake-up from DEEP-SLEEP state will transit the device to INIT state as described in the Section 3.6.3: States

and transitions description.

To avoid disabling all wake-up capability, a hard protection is implemented: the SPI writing to disable the last

wake-up possibility define in the Table 7 is not taken into account and a status register bit

SPI_ALL_WAKEUP_DISABLE is set and generates an IRQ except if MASK_SPI_ERROR_IRQ is set.

Current consumption in DEEP-SLEEP mode is calculated as IVS_DP + wake-up current consumption

contributions.

This can be initiated by one or more of the following events:

Table 7. Wake-up events description

Wake up source

Description

Flag

Level change of wake-up (WU) Can be configured by SPI (WU_ENA(1) bit)

WU_WAKE

Level change of wake-up (IGN) Can be configured by SPI (IGN_ENA(1) bit)

IGN_WAKE

Cyclic monitoring (WU)

Can be configured by SPI (WU_FILT bit with TIMER_ENA = 1)

WU_WAKE

Cyclic monitoring (IGN)

Can be configured by SPI (IGN_FILT bit with TIMER_ENA = 1)

IGN_WAKE

Timer

Can be configured by SPI (TIMER_WAKE_ENA bit with TIMER_ENA = 1)

TIMER_WAKE

1. Wake-up event can be missed during SPI writing to DO_POWER_DOWN = 1.

3.5.2

Wake-up events in ACTIVE mode

All enabled wake-up events described in the Table 7 in ACTIVE mode are signaled to the microcontroller by an

interrupt request on IRQ pin.

3.6

Functional overview - State machine

To make the reading easier the State machine description has been split in three parts: first the state diagram is

presented with the normal transitions (see the Section 3.6.1: State machine without fault transitions), then

transitions resulting to a fault event detection are exposed (see the Section 3.6.2: State machine focusing on fault

transitions), finally the full state machine is described and states and transitions detailed (see the

Section 3.6.3: States and transitions description).

SPSB100

Functional description

DS14640 - Rev 1

page 22/214

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