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L9965P Datasheet(PDF) 41 Page - STMicroelectronics |
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L9965P Datasheet(HTML) 41 Page - STMicroelectronics |
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41 / 104 page  The diagnostic for PF vs PR path (differential ADC) works as follows: the pins are disconnected from the inputs and, applying different internal reference voltages (short-circuit, VREF1 and VREF2), the circuitry checks ADC error (vs VOFFSET_HWSC_TH) and ADC gain (vs VGAIN_HWSC_TH). In the specific case of VRCM path, a direct VRCM output conversion takes place to verify the regulator output is in the expected range. The HWSC diagnostic step duration is tHWSC. Table 23. ADC HWSC diagnostics Fault type Assertion condition IC reaction to assertion Release condition IC reaction to flag clear Maskable PF vs PR pre- deploy HWSC fail If either an offset or gain error is detected during the PF vs PR pre-deployment HWSC, the pre- deploy HWSC fail is acknowledged The PF_PR_PRE_HWSC_FAIL flag is set FAULTN line is asserted Diagnostic routine is stopped at the end of ADC HWSC step Cyclic diagnostic triggers are inhibited The fault flag can always be cleared on read FAULTN line is released Cyclic diagnostic triggers are unmasked ADC_HWSC_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) PF_PR_PRE_HWSC_FAULTN_MSK masks fault redirection on FAULTN pin PF vs PR post- deploy HWSC fail If either an offset or gain error is detected during the PF vs PR post- deployment HWSC, the post-deploy HWSC fail is acknowledged The PF_PR_POST_HWSC_FAIL flag is set FAULTN line is asserted Diagnostic routine is stopped at the end of ADC HWSC step Cyclic diagnostic triggers are inhibited The fault flag can always be cleared on read FAULTN line is released Cyclic diagnostic triggers are unmasked ADC_HWSC_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) PF_PR_POST_HWSC_FAULTN_MSK masks fault redirection on FAULTN pin VRCM HWSC fail If an error is detected during the VRCM vs PGND HWSC, the VRCM HWSC fail is acknowledged The VRCM_HWSC_FAIL flag is set FAULTN line is asserted Diagnostic routine is stopped at the end of ADC HWSC step Cyclic diagnostic triggers are inhibited The fault flag can always be cleared on read FAULTN line is released Cyclic diagnostic triggers are unmasked ADC_HWSC_EN = 0 masks cyclic diagnostic trigger (but not the on- demand one) VRCM_HWSC_FAULTN_MSK masks fault redirection on FAULTN pin L9965P Functional description DS14702 - Rev 4 page 41/104 |
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