This document is intended for system designers who require a hardware implementation overview of the development board features such as the power supply, the clock management, the reset control, the boot mode settings and the debug management. It shows how to use STM32L1xxx product families and describes the minimum hardware resources required to develop an STM32L1xxx application. Detailed reference design schematics are also contained in this document with descriptions of the main components, interfaces and modes.
This application note is intended for system designers requiring a hardware implementation overview of STM32L1xxx development board features, including power supply, clock management, reset control, boot mode settings, and debug management. It describes the minimum hardware resources required to develop an STM32L1xxx application and includes detailed reference design schematics with descriptions of main components and interfaces.
The document covers specific topics such as independent A/D converter and LCD supplies, voltage regulator configurations, power-on and brownout resets, clock sources (MSI, HSE, LSE), boot configuration modes, and SWJ debug port management. It also provides recommendations for printed circuit board design, component positioning, and ground/power supply connections.
| Operating voltage supply (Vpp) | 2.0 V to 3.6 V |
|---|---|
| Core voltage (Vcore) Range 1 | 1.8 V |
| Core voltage (Vcore) Range 2 | 1.5 V |
| Maximum CPU frequency (Range 1) | Full speed |
| Maximum CPU frequency (Range 2) | 16 MHz |
| Maximum CPU frequency (Range 3) | 4 MHz |
The device requires a 2.0 V to 3.6 V operating voltage supply (Vpp) to be fully functional at full speed.
Yes, to improve conversion accuracy, the ADC and the DAC have an independent power supply that can be filtered separately.
The internal voltage regulator can be configured to provide the core with three different voltage ranges from 1.2 V to 1.8 V (typical).