L9908 datasheet(19/152 Pages) STMICROELECTRONICS

No. de pieza	L9908

Descripción Electrónicos	Automotive 3-Phase motor gate driver unit

PDF	152 Pages

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Fabricante Electrónico	STMICROELECTRONICS [STMicroelectronics]

Página de inicio	http://www.st.com

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4.2

Safe state activation

Depending on the safe state its activation is performed through one between two separate paths.

Figure 6. Safe states activation paths

Logic activation path: safe state activation is carried out entirely by the main logic.

This path is used to develop:

•

SAFE HIZ (except if determined by CLK1_TIME_OUT)

•

SAFE DIS

•

SAFE OFF

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

L9908 implements an isolated Safe Switch Off structure which allows to activate an isolated Safe Switch Off

structure which can be activated through a separated path.

This path is used to develop:

•

SAFE OFF (only if determined by NDIS = 0)

•

CLK1_TIME_OUT

The Safe State activation through the damage protected path is signaled by setting the dedicated SPI read only

bit SAFE_STATE (GEN_STATUS1[2]).

L9908

Functional safety

DS13546 - Rev 5

page 19/152

L9908 Datasheet(PDF) 19 Page - STMicroelectronics