STWBC2-HP datasheet(56/96 Pages) STMICROELECTRONICS

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2.2.10.2

Feature list

•

Fault event capture logic equipped with debounce filter

•

Individual enable control line

•

IO signals fault detection logic

•

GDLS signals fault detection logic

•

Notify the fault event to the interrupt controller logic (ITC)

2.2.10.3

Functional description

Here below is shown the internal Protection circuit block diagram.

Figure 55. Protection logic block diagram overview

This block detects the fault events raised in the AFE logic during functional operation; most of them are notified

directly to the FW for the error management handling sequence, while some of them are controlled by the

Protection block.

Once the IP is enabled, by configuring the PROT_CTRL_1 register, the error detection logic is allowed to trigger

the fault events. Two class of faults may be detected:

•

Hard fault: The highest priority faults due to the undervoltage lockout events; these are detected and

managed in the analog logic domain.

•

Soft fault: According to the fault type this may be detected by the protection logic and notified to the MCU or

may be recognized indirectly by the FW application through the ADC conversion process. In both cases the

fault recovery action is submitted to the FW application.

The configuration of the EN_FLTDIS_ANA and EN_FLTDIS_PWM fields of register PROT_CTRL_0 allows to

mask the enable functionality respectively of the Analog macros and the PWM signals when one of the following

fault events is triggered by the interrupt controller logic:

•

IO coherency[3:0]

•

GDLS coherency[2:0]

•

PLL unlock

•

DCDC error

The masking condition is active until the fault error event is recovered by FW.

2.2.10.4

IO fault detection

The IO coherence checker verifies that the state of an IO corresponds effectively to the configured value. This

allows detecting short-circuit on IO signals.

When enabled (IO data_oe), the cell compares a probed state of IO (data_in) with a reference state (IO data_out).

STWBC2-HP

Digital AFE functions

DS13825 - Rev 1.0

page 56/96

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