#12 CubeSat

Sensor / Functionality

Circuit Design

• Microcontroller: ESP32-S3-WROOM-1

• Power Source: LiPo battery + USB-C 5V + Solar Input

• Charging: MCP73871 (multi-source LiPo charger with power path)

• Regulation type: buck regulator (TPS62162)

• Power gating: TPS22917 load switches in every subsystem

• Power monitoring: INA228 (I2C) on 4 rails

• GNSS: u-blox MAX-M10S, I2C

• Wireless: LoRa, SPI with LC matching network

• Primary data bus: I2C - sensors, RTC, power monitors, GPIO expander

• Secondary data bus: SPI

• Filtering: Ferrite beads on SENSORS_3V3, LORA_3V3, GNSS_3V3 rails

• Security: ATECC608A hardware secure element (I2C)

• Storage: W25Q128 256Mb SPI NOR flash