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STM32L471RG データシート(PDF) 20 Page - STMicroelectronics

部品番号 STM32L471RG
部品情報  Batch acquisition mode
PDF  218 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L471RG データシート(HTML) 20 Page - STMicroelectronics

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Functional overview
STM32L471xx
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DocID027226 Rev 1
Figure 2. Power supply overview
3.9.2
Power supply supervisor
The device has an integrated ultra-low-power brown-out reset (BOR) active in all modes
except Shutdown and ensuring proper operation after power-on and during power down.
The device remains in reset mode when the monitored supply voltage VDD is below a
specified threshold, without the need for an external reset circuit.
The lowest BOR level is 1.71V at power on, and other higher thresholds can be selected
through option bytes.The device features an embedded programmable voltage detector
(PVD) that monitors the VDD power supply and compares it to the VPVD threshold. An
interrupt can be generated when VDD drops below the VPVD threshold and/or when VDD is
higher than the VPVD threshold. The interrupt service routine can then generate a warning
message and/or put the MCU into a safe state. The PVD is enabled by software.
In addition, the devices embeds a Peripheral Voltage Monitor which compares the
independent supply voltages VDDA, VDDIO2 with a fixed threshold in order to ensure that the
peripheral is in its functional supply range.



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