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L6474 数据表(PDF) 25 Page - STMicroelectronics |
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L6474 数据表(HTML) 25 Page - STMicroelectronics |
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25 / 51 page  L6474 Functional description Doc ID 022529 Rev 2 25/51 Figure 8. Internal 3 V linear regulator 6.16 SYNC pin This pin works as a synchronization signal: the output status is an echo of one of the bits of the EL_POS register according to a SYNC_SEL and STEP_SEL parameter combination (see paragraph 9.1.10). 6.17 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 ● 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 paragraph 9.1.11, 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 case of daisy-chain configuration, FLAG pins of different ICs can be or-wired to save host controller GPIOs. |
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