STSPIN32F0 datasheet(20/40 Pages) STMICROELECTRONICS

20 / 40 page

Device description

STSPIN32F0

20/40

DocID029806 Rev 2

6.1.1

UVLO on supply voltages

The STSPIN32F0 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 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 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 (e.g. Hall-effect sensors).

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.

An overcurrent and short-circuit protection is provided.

STSPIN32F0 データシート(PDF) 20 Page - STMicroelectronics