https://www.ti.com/product/INA226

OBDH 2.0 repository: https://github.com/spacelab-ufsc/obdh2

With an interrupt GPIO, the slaves can signalize the master when data is ready to read.

Before release:

• Review BOM
• Review Gerbers
• Create draftsman
• Check DNP
• Run DRC (check main rules before)

Current names:

• MCU main
• MCU beacon
• Main radio
• Beacon radio

As used in OBDH 2.0, TCA4311A is a good choice for I2C buses.

Details such as: surface treatment, pcb color and specified no silkcreen need to be updated. Adding IPC class 3 specification may be useful.

• Apply the SpaceLab standard to the schematics and the layout
  • Improve labels
  • Improve the debug pins
  • Add status leds
  • Add version resistors
  • Fix footprints and components
• Add the TX pin to the EPS communication bus
• Change the RF connectors by the through-hole version
• Add a second microcontroller to control the downlink/uplink radio module
• Change the MSP430 microcontroller by a version with FRAM memory
• Add buffer to the communication buses
• Add more optional signals to the PC-104 bus
• Add voltage/current sensors (uC and radio modules)
• Add a CAN bus
• Isolate the SPI bus of the radio modules

Tip: Follow Kleber's checklist

Check if they have reasonable values and if are similar to the OBDH's rules.

Add current and voltage sensors to the power bus of the microcontrollers, and also, if possible, to the radio modules power sources.

Now is SSW-126-04-G-D but it must be TSW-126-07-G-D.

Remove the tactile switch presented in the first TTC version. As experienced during the TTC board usage, it is not necessary.

The OBDH 2.0 repository can be used as reference.

Some componentes are directly linked to old EPS and Floripasat libraries, full replacement may be needed to update the components symbol and footprint characteristics.

Reference: https://www.semtech.com/products/wireless-rf/lora-core/sx1278
Driver reference: https://www.nicerf.com/products/detail/sx1278-wireless-module-lora1278f30.html

This might be useful for some time of handshake operations, synchronization or redundancy.

Improve nomenclature and folder structure
Improve labels
Improve the debug pins
Improve the mechanical holes
Improve the layers organization
Improve the outputs and documentation
Add status leds
Fix footprints and components

Reference: https://www.amsat.org/amsat/articles/g3ruh/109.html

There are a lot of improvements for the labels:

• Placement
• Pinout
• Connectors purpose (e.g., ant interface)
• Testpoints
• GND quick access
• LEDs function