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L9965P Datasheet(PDF) 47 Page - STMicroelectronics

Part # L9965P
Description  Automotive single channel pyro-fuse driver
PDF  104 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L9965P Datasheet(HTML) 47 Page - STMicroelectronics

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Table 26. Pyro igniter diagnostics
Fault
type
Assertion
condition
IC reaction to
assertion
Release condition
IC
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
pin
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
pin
L9965P
Functional description
DS14702 - Rev 4
page 47/104



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