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L9300 Datasheet(PDF) 46 Page - STMicroelectronics |
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L9300 Datasheet(HTML) 46 Page - STMicroelectronics |
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46 / 182 page  9.1.3 Reset outputs error handling Table 18. Reset outputs type of error Type of error Detection condition Action Clear SPI flag Restart condition RES1 output low ON state SPI register reset, as described in SPI register map N.D. Automatic after fault disappears, SPI configuration to be reinitialized RES1 input low ON state SPI register reset, as described in SPI register map, set RES1 to digital SPI bit (16) in SERVFLT register On read Automatic after fault disappears, SPI configuration to be reinitialized RES2 output low ON state No action N.D. N.A. 9.2 Ground Loss 9.2.1 Ground Loss Functional Description The device provides the ground loss detection for GND and GND_A ground pins. At device start-up, once internal logic is out of POR state, two dedicated comparators monitor the voltage of each ground pin using the other ground pin as 0 V reference. If the voltage of at least one of the two ground pins is higher than Ground Loss threshold for a time longer than Ground Loss filter time then Ground Loss fault is detected. In case of Ground Loss detection the logic takes the following actions: • Bit19 (Ground Loss) in Service Fault register is set “high” • All the device outputs (see Functional Table) are turned off The device is forced in this condition until the ground loss fault is present. If the fault is removed and both the voltages on GND and GND_A pins become lower than Ground Loss threshold then all the outputs are automatically restarted by the logic. 9.2.2 Ground Loss electrical characteristics 5.5 V ≤ VBATP ≤ 19 V; -40 °C ≤ Tj ≤ 175 °C unless otherwise noticed. All voltages refer to GND pin. Table 19. Ground Loss electrical characteristics Symbol Parameter Test condition Min Typ Max Unit Pin GND Monitors GND_loss_th Ground Loss threshold 100 200 350 mV GND GND_A_loss_th Digital Ground Loss threshold 100 200 350 mV GND_A GND_loss_filt Ground Loss filter time 8 16 24 µs GND, GND_A 9.2.3 Ground Loss error handling Table 20. Ground Loss type of error Type of error Detection condition Action Clear SPI flag Restart condition GND_loss ON state Outputs OFF as in Functional Table, set Ground Loss bit (19) in SPI SERVFLT register On read Automatic after fault disappears GND_A_loss ON state Outputs OFF as in Functional Table, set Ground Loss bit (19) in SPI SERVFLT register On read Automatic after fault disappears L9300 Ground Loss DS12258 - Rev 4 page 46/182 |
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