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L6470 bảng dữ liệu(PDF) 33 Page - STMicroelectronics

tên linh kiện L6470
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L6470 bảng dữ liệu(HTML) 33 Page - STMicroelectronics

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L6470
Functional description
Doc ID16737 Rev 4
33/70
6.18
FLAG pin
By default, an internal open drain transistor pulls the FLAG pin to ground when at least one
of the following conditions occurs:
●
Power-up or standby/reset exit
●
Stall detection on A bridge
●
Stall detection on B bridge
●
Overcurrent detection
●
Thermal warning
●
Thermal shutdown
●
UVLO
●
Switch turn-on event
●
Wrong command
●
Non-performable command.
It is possible to mask one or more alarm conditions by programming the ALARM_EN
register (see Section 9.1.20, Table 21). If the corresponding bit of the ALARM_EN register is
low, the alarm condition is masked and it does not cause a FLAG pin transition; all other
actions imposed by alarm conditions are performed anyway. In the case of daisy chain
configuration, FLAG pins of different ICs can be or-wired to save host controller GPIOs.



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