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L9779WD-SPI Datasheet(PDF) 22 Page - STMicroelectronics |
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L9779WD-SPI Datasheet(HTML) 22 Page - STMicroelectronics |
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22 / 141 page  Functional description L9779WD-SPI 22/141 DocID027721 Rev 2 When the KEY_ON reaches a sufficient high voltage VKEYH, after a minimum deglitch filter time T_KEY the system is switched on. First of all the main relay driver is switched on, so the main relay connects VB pin to battery. Control current into pin KEY_ON is sufficient for basic functions such as filtering time, control of the main relay output stage, internal oscillator and internal bias currents. When the voltage at VB exceeds the under voltage-detection threshold for VB (VB_UV_H) the internal biasing circuits are activated. VDD5 regulator is activated Tdelay_REG seconds later. After VDD5 exceeds the VDD_UV threshold and with typ. 1.0 ms delay, the V3V3 is activated also. The sensor supplies VTRK1, 2 are turned on together with VDD5. Figure 7. Permanent supply power-up sequence In the case when VB is always connected, when the KEY_ON voltage exceeds VKEYH the internal biasing circuits are activated. VDD5 regulator is activated Tdelay_REG seconds after the tKEY filter time has expired. |
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