EVAL6470H Datasheet, PDF (33/70 Pages) STMicroelectronics – dSPIN fully integrated microstepping motor driver with motion engine and SPI

L6470
6.18
Functional description
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.
Doc ID16737 Rev 5
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