SPSB100 datasheet(19/213 Pages) STMICROELECTRONICS

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BUCK2 can be disabled by the SPI bit VBUCK2_ENA. (only after SPI_PROTECT_ACCESS has been set). In

active low power mode, the action of enable BUCK2 is not allowed.

The live bit VBUCK2_ENA_STATUS reflects the state of BUCK2 output.

Note:

After the first power up is needed to align the live bit associated in DSR18 (VBUCK2_ENA_STATUS) with the

current value associated in DCR1.

In active full power BUCK2 converter provides the following diagnostics:

•

UV detection to monitor the output voltage (flag is BUCK2_UV). BUCK2 is therefore switched off after

tbuck2_UV_TO except if SPI bit MASK_BUCK2_UV_POWER_OFF is set.

•

Undervoltage detection generates an IRQ except if MASK_BUCK2_IRQ is set.

•

OV detection to monitor the output voltage (flag is BUCK2_OV bit) BUCK2 is therefore switched off after

tbuck2_OV_TO. Status register bit BUCK2_OV must be read and cleared before switching ON the regulator

by SPI bit VBUCK2_ENA to allow a proper start-up (only when BUCK2 is not critical for MCU).

•

Overvoltage detection generates an IRQ except if MASK_BUCK2_IRQ is set.

•

Power-good used to signal BUCK power on success (flag is BUCK2_PG_OK bit and IRQ is generated

except if MASK_BUCK2_PG_IRQ is set):

–

If not, after TBUCK2_PG_TO timing, BUCK2 is switched off and flag BUCK2_PG_TIMEOUT is set.

•

Not successful power-good detection generates an IRQ except if MASK_BUCK2_PG_TIMEOUT_IRQ is

set.

•

Configurable overcurrent protection through U-NVM BUCK2_IPEAK(flag is BUCK2_OC bit). BUCK2 is

therefore switched off after tbuck2_OC_TO except if MASK_BUCK2_OC_POWER_OFF is set.

•

Overcurrent detection generates an IRQ except if MASK_BUCK2_OC_IRQ is set.

•

Warning temperature detection by a local thermal sensor (flag is TW_CL2).

•

Warning temperature detection generates an IRQ except if MASK_CL2_TW_IRQ is set.

•

Overtemperature detection by a local thermal sensor (flag is TSD_CL2, see also the

Section 4.7: Temperature monitoring) and BUCK2 is switched off.

•

BUCK2 internal regulators detection, flag is BUCK2_INT_FAIL and the BUCK2 is switched off.

•

Internal fail generates an IRQ except if MASK_BUCK2_IRQ is set.

•

BUCK2 Feedback (FB2) pin disconnection, flag is BUCK2_UV and the BUCK2 is switched off.

•

FB2 pin disconnection generates an IRQ except if MASK_BUCK2_IRQ is set.

•

After a fault detection (UV, OV,OC, FBLOSS, TSD_CL2 or PG timeout), BUCK2 can be re

‑enabled by

setting BUCK2_ENA = 0 followed by BUCK2_ENA = 1.

In active low power, BUCK2 converter provides the following diagnostics:

•

UV detection to monitor the output voltage (flag is BUCK2_UV). BUCK2 is therefore switched off except if

SPI bit MASK_BUCK2_UV_POWER_OFF is set.

•

Undervoltage detection generates an IRQ except if MASK_BUCK2_IRQ is set.

•

OV detection to monitor the output voltage (flag is BUCK2_OV bit) BUCK2 is therefore switched off.

•

Overvoltage detection generates an IRQ except if MASK_BUCK2_IRQ is set.

•

Overcurrent protection (flag is BUCK2_OC bit). BUCK2 is therefore switched off except if

MASK_BUCK2_OC_POWER_OFF is set.

•

Overcurrent detection generates an IRQ except if MASK_BUCK2_OC_IRQ is set.

•

BUCK2 feedback (FB2) pin disconnection, flag is BUCK2_FBLOSS and the BUCK2 is switched off.

•

FB2 pin disconnection generates an IRQ except if MASK_BUCK2_IRQ is set.

•

Overtemperature detection by a central thermal sensor (flag is TSD_CL0, see also the

Section 4.7: Temperature monitoring) and device is executed power down sequence.

In active and REC-1 states, when BUCK2_REGFAIL_GO_REC is set at 1 in USER-NVM, in case of PG timeout,

OV, UV, INT_FAIL, OC, FBLOSS or TSD events the device executes a power down sequence, enters in REC-2

state and makes an automatic retry. PG_TIMEOUT, OV, UV, OC, INT_FAIL, FBLOSS or TSD flags are not

blocking to re-enable the BUCK2 after a fail event.

It is not recommended to use MASK_BUCK2_OC_POWER_OFF and MASK_BUCK2_UV_POWER_OFF in the

same time.

3.3.3

BUCK3 converter

BUCK3 is a postregulator and needs to be supplied by BUCK1 or BUCK2 through the VIN3 pin.

SPSB100

Functional description

DS14640 - Rev 2

page 19/213

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