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L9965P Datasheet(PDF) 63 Page - STMicroelectronics |
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L9965P Datasheet(HTML) 63 Page - STMicroelectronics |
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63 / 104 page  3.13 Ground loss monitor (GNDMON) To detect failures in grounding, the IC integrates a ground loss monitor that is always enabled when it is in DIAG, NORMAL and ARM states. 3.13.1 Ground loss monitor diagnostics Table 38. Ground loss monitor diagnostics Fault type Assertion condition IC reaction to assertion Release condition IC reaction to flag clear Maskable PGND LOSS If a differential voltage greater than VPGND_LOSS_TH arises between GND and PGND for a time longer than tPGND_LOSS_FLT, the PGND loss fault is acknowledged The PGND_LOSS flag is set FAULTN line is asserted The “fire inhibit” signal is set If the differential voltage between GND and PGND falls below VPGND_LOSS_TH for a time longer than tPGND_LOSS_FLT, the fault flag can be cleared by MCU Pyro-fuse fire is possible again Non-maskable BSTGND LOSS If a differential voltage greater than VBSTGND_LOSS_TH arises between GND and BSTGND for a time longer than tBSTGND_LOSS_FLT, the BSTGND loss fault is acknowledged The BSTGND_LOSS flag is set FAULTN line is asserted If enabled, ERBST is disabled If disabled, ERBST is not turned-on (diagnostic is active thanks to IBSTGND_PU internal pull-up) The “fire inhibit” signal is set If the differential voltage between GND and BSTGND falls below VBSTGND_LOSS_TH for a time longer than tBSTGND_LOSS_FLT, the ERBST is automatically reenabled and the fault flag can be cleared by MCU Pyro-fuse fire is possible again BSTGND_LOSS_MSK masks the inhibition of pyro-fuse fire commands 3.13.2 Ground Loss monitor electrical parameters All parameters are tested and guaranteed in the following conditions, unless otherwise noted: all supplies according to the Table 3; TJ according to the Table 2. Table 39. Ground Loss monitor electrical parameters Symbol Parameter Test condition Min Typ Max Unit Pin VPGND_LOSS_TH PGND ground loss detection threshold 300 - 920 mV GND1, GND2, PGND tPGND_LOSS_FLT PGND ground loss detection filter time Tested by SCAN 46 50 54 µs GND1, GND2, PGND VBSTGND_LOSS_TH BSTGND ground loss detection threshold 300 - 920 mV GND1, GND2, BSTGND tBSTGND_LOSS_FLT BSTGND ground loss detection filter time Tested by SCAN 1.9 2.3 2.7 µs GND1, GND2, BSTGND IBSTGND_PU BSTGND pull-up current 25 40 55 µA BSTGND L9965P Functional description DS14702 - Rev 4 page 63/104 |
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