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STM32H747AI Datasheet(PDF) 27 Page - STMicroelectronics

Part # STM32H747AI
Description  Dual 32-bit Arm® Cortex®-M7 up to 480MHz and -M4 MCUs, up to 2MB Flash, 1MB RAM, 46 com. and analog interfaces, SMPS, DSI
PDF  252 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32H747AI Datasheet(HTML) 27 Page - STMicroelectronics

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DS12930 Rev 1
17/242
STM32H747xI/G
Functional overview
46
Figure 4. Power-up/power-down sequence
1. VDDx refers to any power supply among VDDA, VDD33USB, VDD50USB and VDDDSI.
2. VDD and VDDSMPS must be wired together into order to follow the same voltage sequence.
3.5.2
Power supply supervisor
The devices have an integrated power-on reset (POR)/ power-down reset (PDR) circuitry
coupled with a Brownout reset (BOR) circuitry:
•
Power-on reset (POR)
The POR supervisor monitors VDD power supply and compares it to a fixed threshold.
The devices remain in Reset mode when VDD is below this threshold,
•
Power-down reset (PDR)
The PDR supervisor monitors VDD power supply. A reset is generated when VDD drops
below a fixed threshold.
The PDR supervisor can be enabled/disabled through PDR_ON pin.
•
Brownout reset (BOR)
The BOR supervisor monitors VDD power supply. Three BOR thresholds (from 2.1 to
2.7 V) can be configured through option bytes. A reset is generated when VDD drops
below this threshold.
MSv47490V1
0.3
1
VBOR0
3.6
Operating mode
Power-on
Power-down
time
V
VDDX
(1)
VDD
Invalid supply area
VDDX < VDD + 300 mV
VDDX independent from VDD



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