STSPIN32F0ATR datasheet(22/41 Pages) STMICROELECTRONICS

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Device description

STSPIN32F0A

22/41

DocID030766 Rev 2.0

6.1.1

UVLO on supply voltages

The STSPIN32F0A device provides UVLO protections on all power supplies.

The device enters into the undervoltage condition when the power supply voltage falls

below the off threshold voltage and expires when the motor supply voltage goes over the

on threshold voltage.

Table 9: "UVLO and OT protection management" shows the UVLO protection

management: which blocks are switched off after an UVLO event.

Figure 6: Power-up and power-down sequence

6.1.2

Thermal protection

The device embeds an overtemperature shut-down protection. The thermal sensors are

placed next to the DC/DC and linear regulator blocks.

When the OT protection is triggered the correspondent block is switched off, the thermal

shut-down condition only expires when the temperature goes below the “TSD - Thys”

temperature (auto-restart).

Table 9: "UVLO and OT protection management" shows the thermal protection

management which blocks are switched off after an overtemperature event.

6.2

DC/DC buck regulator

The internal DC/DC buck converter provides the 3.3 V supply voltage suitable to supply the

MCU and other external devices.

The regulator operates in the discontinuous current mode (DCM).

A soft-start function with fixed start-up time is implemented to minimize the inrush current at

the start-up, refer to Figure 8: "Soft-start timing".

An overcurrent and short-circuit protection is provided.

If the failure event occurs on the SW pin and the IOVC threshold is reached the regulator is

latched off. To restart the DC/DC regulator a power-down and power-up cycle of device

supply voltage (VM) is mandatory.

VDD

VREG

VMOn

VDDOn

PWR_OK

tss

13 V typ.

PWR_OK

The DC/DC Reg

stops to work

The actualVDD voltage falls to 0V

discharging the output capacitan ce

The Lin Reg

stops to work

The actualVREG voltage falls to 0V

discharging the output capacitan ce

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