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STM32L151VCH7D View Datasheet(PDF) - STMicroelectronics

Part Name
Description
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STM32L151VCH7D Datasheet PDF : 136 Pages
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STM32L151xC STM32L152xC
Functional overview
The memory protection unit (MPU) improves system reliability by defining the memory
attributes (such as read/write access permissions) for different memory regions. It provides
up to eight different regions and an optional predefined background region.
Owing to its embedded ARM core, the STM32L151xC and STM32L152xC devices are
compatible with all ARM tools and software.
Nested vectored interrupt controller (NVIC)
The ultra-low-power STM32L151xC and STM32L152xC devices embed a nested vectored
interrupt controller able to handle up to 53 maskable interrupt channels (not including the 16
interrupt lines of ARM® Cortex®-M3) and 16 priority levels.
• Closely coupled NVIC gives low-latency interrupt processing
• Interrupt entry vector table address passed directly to the core
• Closely coupled NVIC core interface
• Allows early processing of interrupts
• Processing of late arriving, higher-priority interrupts
• Support for tail-chaining
• Processor state automatically saved on interrupt entry, and restored on interrupt exit,
with no instruction overhead
This hardware block provides flexible interrupt management features with minimal interrupt
latency.
3.3
3.3.1
3.3.2
Reset and supply management
Power supply schemes
• VDD = 1.65 to 3.6 V: external power supply for I/Os and the internal regulator. Provided
externally through VDD pins.
• VSSA, VDDA = 1.65 to 3.6 V: external analog power supplies for ADC, reset blocks, RCs
and PLL (minimum voltage to be applied to VDDA is 1.8 V when the ADC is used). VDDA
and VSSA must be connected to VDD and VSS, respectively.
Power supply supervisor
The device has an integrated ZEROPOWER power-on reset (POR)/power-down reset
(PDR) that can be coupled with a brownout reset (BOR) circuitry.
The device exists in two versions:
• The version with BOR activated at power-on operates between 1.8 V and 3.6 V.
• The other version without BOR operates between 1.65 V and 3.6 V.
After the VDD threshold is reached (1.65 V or 1.8 V depending on the BOR which is active or
not at power-on), the option byte loading process starts, either to confirm or modify default
thresholds, or to disable the BOR permanently: in this case, the VDD min value becomes
1.65 V (whatever the version, BOR active or not, at power-on).
When BOR is active at power-on, it ensures proper operation starting from 1.8 V whatever
the power ramp-up phase before it reaches 1.8 V. When BOR is not active at power-up, the
power ramp-up should guarantee that 1.65 V is reached on VDD at least 1 ms after it exits
the POR area.
DocID022799 Rev 13
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