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STM32G474PBY6XXX 数据表(PDF) 26 Page - STMicroelectronics |
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STM32G474PBY6XXX 数据表(HTML) 26 Page - STMicroelectronics |
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26 / 236 page ![]() Functional overview STM32G474xB STM32G474xC STM32G474xE 26/236 DS12288 Rev 5 3.11.6 VBAT operation The VBAT pin allows to power the device VBAT domain from an external battery, an external supercapacitor, or from VDD when there is no external battery and when an external supercapacitor is present. The VBAT pin supplies the RTC with LSE and the backup registers. Three anti-tamper detection pins are available in VBAT mode. The VBAT operation is automatically activated when VDD is not present. An internal VBAT battery charging circuit is embedded and can be activated when VDD is present. Note: When the microcontroller is supplied from VBAT, neither external interrupts nor RTC alarm/events exit the microcontroller from the VBAT operation. |
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