II Stack Hardware in Detail

MCU/PWR Board - REV D

Hardware Features

Data Connections:

• I2C
• UART3
• GPIO 0, 1

Power Connections:

• +3V3
• +5V
• SRAD BATT

Key ICs:

• Raspberry Pi 4B 4Gb
• 3.3V Linear regulator (TBD)
• 5V linear regulator (TBD)
• Battery charge detection IC (TBD) (I2C Address: TBD)
• Thermistor interface IC (TBD) (I2C Address: TBD)

Outline of Operation

The MCU board shall perform the following tasks: *

Approx Operating +3V3 current draw

• TBD Charge Detection: *** mA
• TBD Thermistor Interface: *** mA
• M24C02: 1 mA

RF Board - REV F

Hardware Features

Data Connections: UART I2C

Power Connections:

• 3V3
• USB-C

Key ICs:

• RN2483-A LoRa Transceiver
• M24C02 I2C Board ID EEPROM (I2C Address: 0x54)

Outline of Operation

The RF board shall perform the following tasks: * Approx Operating +3V3 current draw

• RN2483: 40 mA
• M24C02: 1 mA

SEN Board - REV B

Hardware Features

Data Connections:

• I2C

Power Connections:

• +3V3

Key ICs:

• 2 x MS5611 Barometric Pressure Sensor (I2C Address: 0x76 + 0x77)
• MAX-M10S GPS Module (I2C Address: 0x42)
• LSM6DSO32 Accelerometer + Gyroscope (I2C Address: 0x6B)
• SHT41 Temperature + Humidity sensor (I2C Address: 0x44)
• M24C02 I2C Board ID EEPROM (I2C Address: 0x50)

Outline of Operation

The SEN board shall perform the following tasks: *

Approx +3V3 current draw

• MS5611: 2 x 10 uA
• MAX-M10S: 10 mA, max 100 mA
• LSM6DSO32: 1 mA
• SHT41: 0.5 uA
• M24C02: 1 mA

All I2C addresses are 7 bit addresses with the 8 bit a read/write selector.