L9965P-FN datasheet(47/104 Pages) STMICROELECTRONICS

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Table 26. Pyro igniter diagnostics

Fault

type

Assertion

condition

IC reaction to

assertion

Release condition

reaction

to flag

clear

Maskable

Pyro low

resistance

If the PF vs PR

converted voltage

is lower than

VRES_LOW_TH the

PYRO_LOW_RES

fault is

acknowledged

The

PYRO_LOW_RES

flag is set

FAULTN line is

asserted

Diagnostic routine

is stopped at the

end of PYRO RES

step

Cyclic diagnostic

triggers are

inhibited

The

PYRO_LOW_RES

flag can always be

cleared on read

FAULTN

line is

released

Cyclic

diagnostic

triggers

are

unmasked

PYRO_RES_EN = 0 masks cyclic

diagnostic trigger (but not the on-

demand one)

PYRO_LOW_RES_FAULTN_MSK

masks fault redirection on FAULTN

Pyro high

resistance

If the PF vs PR

converted voltage

is higher than

VRES_HIGH_TH the

PYRO_HIGH_RES

fault is

acknowledged

The

PYRO_HIGH_RES

flag is set

FAULTN line is

asserted

Diagnostic routine

is stopped at the

end of PYRO RES

step

Cyclic diagnostic

triggers are

inhibited

The

PYRO_HIGH_RES

flag can always be

cleared on read

FAULTN

line is

released

Cyclic

diagnostic

triggers

are

unmasked

PYRO_RES_EN = 0 masks cyclic

diagnostic trigger (but not the on-

demand one)

PYRO_HIGH_RES_FAULTN_MSK

masks fault redirection on FAULTN

L9965P

Functional description

DS14702 - Rev 4

page 47/104

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