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STM32L4S5AII3 Datasheet(PDF) 24 Page - STMicroelectronics

Part # STM32L4S5AII3
Description  Ultra-low-power Arm® Cortex®-M4 32-bit MCUFPU, 150DMIPS, up to 2MB Flash, 640KB SRAM, LCD-TFT & MIPI DSI, AESHASH
PDF  275 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

STM32L4S5AII3 Datasheet(HTML) 24 Page - STMicroelectronics

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Functional overview
STM32L4S5xx, STM32L4S7xx and STM32L4S9xx
24/275
DocID030322 Rev 2
Figure 4. STM32L4S9xx power supply overview
3.10.2
Power supply supervisor
The STM32L4S5xx, STM32L4S7xx and STM32L4S9xx devices have an integrated ultra-
low-power Brownout reset (BOR) active in all modes (except for Shutdown mode). The BOR
ensures proper operation of the devices after power-on and during power down. The
devices remain 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 1.71 V at power on, and other higher thresholds can be selected
through option bytes.The devices feature 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.
MSv38488V1
VDDA domain
Backup domain
2 x D/A converters
3 x A/D converters
Standby circuitry
(Wakeup logic,
IWDG)
Voltage regulator
Low voltage detector
LSE crystal 32 K osc
BKP registers
RCC BDCR register
RTC
2 x comparators
2 x operational amplifiers
Voltage reference buffer
I/O ring
VCORE domain
Temp. sensor
Reset block
3 x PLL, HSI, MSI
Flash memory
DSI PHY
VDD12DSI
USB transceivers
VDDUSB
VDDIO2
VDDIO1
I/O ring
PG[15:2]
VDDIO2
VDDA
VSSA
VSS
VSS
VDDIO2 domain
VDD domain
VCORE
VSS
VDD
VBAT
DSI
voltage regulator
VCAPDSI
VDDDSI
Core
SRAM1
SRAM2
SRAM3
Digital
peripherals



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