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L9965P Datasheet(PDF) 49 Page - STMicroelectronics |
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L9965P Datasheet(HTML) 49 Page - STMicroelectronics |
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49 / 104 page  Table 27. HS/LS FETs diagnostics Fault type Assertion condition IC reaction to assertion Release condition IC reaction to flag clear Maskable PF FET STG fail If, during the HS ON phase, the VRCM current raises above ILEAK_SOURCE_TH for longer than tFET_TEST_FLT, the PF_FET_STG fault is acknowledged The PF_FET_STG flag is set FAULTN line is asserted Diagnostic routine is stopped immediately and the PF command will be set OFF Cyclic diagnostic triggers are inhibited The “fire inhibit” signal is set The fault flag can only be cleared in case the diagnostic is retriggered manually and gives a positive outcome FAULTN line is released Cyclic diagnostic triggers are unmasked HS_LS_FET_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) PF_FET_FAIL_FAULTN_MSK masks fault redirection on FAULTN pin PF_FET_FAIL_FIRE_MSK masks the inhibition of pyro-fuse fire commands PF FET fail If, during HS ON phase, the VRCM current does not exceed the threshold ILEAK_SINK_TH, after tFET_TEST_TO the test is terminated and the FET is turned-off The PF_FET_FAIL flag is set FAULTN line is asserted Diagnostic routine is stopped immediately Cyclic diagnostic triggers are inhibited The “fire inhibit” signal is set The fault flag can only be cleared in case the diagnostic is retriggered manually and gives a positive outcome FAULTN line is released Cyclic diagnostic triggers are unmasked HS_LS_FET_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) PF_FET_FAIL_FAULTN_MSK masks fault redirection on FAULTN pin PF_FET_FAIL_FIRE_MSK masks the inhibition of pyro-fuse fire commands PR FET STB fail If, during the LS ON phase, the VRCM current raises above ILEAK_SINK_TH for longer than tFET_TEST_FLT, the PR_FET_STB fault is acknowledged The PR_FET_STB flag is set FAULTN line is asserted Diagnostic routine is stopped immediately and the PR command will be set OFF Cyclic diagnostic triggers are inhibited The “fire inhibit” signal is set The fault flag can only be cleared in case the diagnostic is retriggered manually and gives a positive outcome FAULTN line is released Cyclic diagnostic triggers are unmasked HS_LS_FET_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) PR_FET_FAIL_FAULTN_MSK masks fault redirection on FAULTN pin PR_FET_FAIL_FIRE_MSK masks the inhibition of pyro-fuse fire commands PR FET fail If, during LS ON phase, the VRCM current does not exceed the threshold ILEAK_SOURCE_TH, after tFET_TEST_TO the test is terminated and the FET is turned-off The PR_FET_FAIL flag is set FAULTN line is asserted Diagnostic routine is stopped immediately Cyclic diagnostic triggers are inhibited The “fire inhibit” signal is set The fault flag can only be cleared in case the diagnostic is retriggered manually and gives a positive outcome FAULTN line is released Cyclic diagnostic triggers are unmasked HS_LS_FET_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) PR_FET_FAIL_FAULTN_MSK masks fault redirection on FAULTN pin PR_FET_FAIL_FIRE_MSK masks the inhibition of pyro-fuse fire commands L9965P Functional description DS14702 - Rev 4 page 49/104 |
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