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L9396 数据表(PDF) 35 Page - STMicroelectronics |
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L9396 数据表(HTML) 35 Page - STMicroelectronics |
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35 / 109 page  DS12539 Rev 10 35/109 L9396 Power supply 109 3.11 Power up and power down sequences Wake-up signal turns on the device and initiates the regulator power up sequence as in the figure below. Figure 6. Power up sequence from wake up input The device provides three different possibilities to stay in ON state: • a persistent high signal on IGN pin, • the setting of the POWERHOLD bit through SPI, • the refreshing of the KEEPALIVE bit through SPI within a specified time frame. At each transition H->L on the wake-up pin the device enters the keep-alive mode for one keep-alive period (KA_period). - Shutdown delay time - 90 - 110 µs Ileak Off state leakage current VB_SW off -1 - 1 µA Table 15. Protected battery switch electrical characteristics (continued) Symbol Parameter Conditions Min Typ Max Units VBATP IGN ON VPREREG VCORE VPREREG _UV RESET OFF Ton RESET VCC GADG1901171330PS VCC5_UV VCORE_UV VCC_UV VCC_dly VCC5_dly WAKE_FLT_up St-by VCC 5 |
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