STEVAL-HARVEST1 Circuit Schematic
This document provides the circuit schematic for the STEVAL-HARVEST1 development board from STMicroelectronics. The schematic illustrates the detailed interconnections of various electronic components, including the main microcontroller, sensors, power management circuitry, and passive components, enabling a comprehensive understanding of the board's design and functionality.
Key Components and Connectivity
- Main Microcontroller: The schematic shows connections to an STM32 microcontroller, utilizing numerous pins for peripheral control, communication, and general I/O.
- Sensors:
- SHT40: Temperature and humidity sensor, connected via I2C (SCL/SDA) to microcontroller pins PA12 and PA15.
- STTS22H1: Temperature sensor, also connected via I2C (SCL/SDA) to PA12 and PA15.
- STHS34: Temperature sensor, connected via I2C (SCL/SDA) to PA12 and PA15.
- LIS2DU12TR: Accelerometer, with interrupt outputs (INT1, INT2) connected to microcontroller pins.
- Power Management & Components:
- Diodes (BAT60J): Likely used for power protection or routing.
- Capacitors (C1-C17): Various values (e.g., 100nF, 10uF, 2200uF) are used for power supply filtering and decoupling across different parts of the circuit.
- Resistors (R1, R3, R17-R33): Used for pull-ups, pull-downs, current limiting, or as part of filter circuits. Many are marked as "N.M." (Not Mounted) or "OR".
- Connectors (J1-J23): Various connectors are present for board expansion, debugging interfaces, and power input.
- Solder Jumpers (JP1-JP18): Configurable points on the board, often pre-bridged ("SolderJumper_2_Bridged") to set default operating modes or select signal paths.
- Unused GPIOs: The schematic notes that certain microcontroller GPIO pins are not used on this board: PA7, PA9, PB3, PB5, PB10.
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Document Version: STEVAL-HARVEST1 - Rev 1 - July 2025
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