STPM098C datasheet(96/110 Pages) STMICROELECTRONICS

Part #	STPM098C

Description	Automotive dual digital 8-phase controller with PMBus™

PDF	110 Pages

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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96 / 110 page

3.16.2

Safe state activation

The safe state activation is established through two separate paths.

Figure 80. Safe states activation paths

VRn_EN

PWMn

CLK1_TIME_OUT

Logic Activation Path

Damage Protected Activation Path

Safe

Switch-off

Main Logic

SAFE_SW_ECHO

Fault

Management

Unit

PWMn

…..

Logic activation path: safe state activation is carried out entirely by the main logic. This path is used to enter

SAFE

‑HIZ state except if it is determined by CLK1_TIME_OUT and VREF1_UV/OV.

Damage protected activation path: in case of device failure where the internal main logic integrity is compromised,

STPM098C implements an isolated safe switch off structure which allows it to activate through a separated path.

This path is used to generate:

•

VREF1_OV

•

VREF1_UV

•

CLK1_TIME_OUT

The safe state activation through the damage protected path is signaled by setting to ‘1’ the dedicated PMBus™

read only register SAFE_HIZ_ECHO.

STPM098C

Functional description

DS14440 - Rev 1

page 96/110

STPM098C Datasheet(PDF) 96 Page - STMicroelectronics