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VNF9Q20F Datasheet(PDF) 32 Page - STMicroelectronics |
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VNF9Q20F Datasheet(HTML) 32 Page - STMicroelectronics |
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32 / 109 page  MCUext = 1 (default) Table 33. OTP memory map - MCUext = 1 OTP Memory Map Register (3Eh) bit 1, bit 0 bit 1, bit 0 bit 1, bit 0 bit 1, bit 0 00 01 10 11 CH3 DI1 DI0 DI1 OFF CH2 DI1 DI0 DI1 OFF CH1 DI0 DI0 DI1 OFF CH0 DI0 DI0 DI1 OFF In fail-safe mode, the device is configured in auto restart in case of harness protection triggering (automatic restart will occur when Counter down count will reach 0). ITOFFSRx will be set as soon as harness protection is triggered, it can be reset only by a R&C command (unlatching the channel, no counter reset). In normal mode, device is configured in latch. As soon as ITOFFSRx is set (at harness protection triggering), a R&C command is needed for unlatch. When the unlatch command is sent, the counter will retain the value reached during down counting (no counter reset). MCUext = 0 Table 34. OTP memory map - MCUext = 0 OTP Memory Map Register (3Eh) bit 1, bit 0 bit 1, bit 0 bit 1, bit 0 bit 1, bit 0 00 01 10 11 CHx ON ON OFF OFF • DI0: configured as STATUS (Global i²t fault indication active low => OR between all channels fault flag). • DI1: configured as F_CTRL (Unlatcher active high for all channels i²t protection at once). • DI0 configured as STATUS and DI1 configured as F_CTRL are enabled in both Fail Safe and Normal modes. • Harness protection latches OFF the corresponding channel. ITOFFSRx will be kept high till a R&C command is acquired. (ITOFFSRx bit remains high even if F_CTRL will unlatch all channels and even if counters reaches 0). • Unlatch through DI1 (F_CTRL) toggling, pulled high for at least 20 μs and then set low, or R&C on ITOFFSRx. All channels will be unlatched at once. Then, the counter will retain the value reached during down counting (no counters value reset). • F_CTRL = Low → Protection active. • F_CTRL = High To Low → Unlatch all channels harness protection, regardless of the counter value (no counters value reset). Further information about the OTP programming mode is provided in the dedicated user manual UM3275 (OTP programming for STi²Fuse devices). 4.4.2 Procedure to turn on the outputs with the direct input DIx By applying logic level high/low to the pin, it turns ON/OFF the associated OTP selected outputs in fail-safe mode. In normal mode, the DIx effect is ORed with SPI configuration when the DIENCR bit is set. Then this truth table specifies the output state: Table 35. Truth table DIENCR SOCRx Related DIx logic status OUTPUTx state 1 1 X ON VNF9Q20F SPI functional description DS13909 - Rev 6 page 32/109 |
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