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L6472 数据表(PDF) 32 Page - STMicroelectronics |
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L6472 数据表(HTML) 32 Page - STMicroelectronics |
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32 / 69 page  Functional description L6472 32/69 Doc ID 022729 Rev 1 6.17.2 SYNC operation mode The pin works as a synchronization signal when the SYNC_EN bit is set high. In this mode a step-clock signal is provided on the output according to a SYNC_SEL and STEP_SEL parameter combination (see Section 9.1.16). 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 occur: ● Power-up or standby/reset exit ● 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 Table 22). 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, the FLAG pins of different ICs can be OR-wired to save host controller GPIOs. |
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