Modifications

{{underline|'''Important facts:'''}}

{{underline|'''Important facts:'''}}

# The MCU board is responsible of its own voltage regulation.

# The MCU board is responsible of its own voltage regulation.

# The MCU board regulated voltages '''are not shared''' with the Cansat Base board.

# The MCU board regulated voltages '''are not shared''' with the Cansat Base board.

{{underline|'''When USB plugged on MCU board :'''}} The "MCU board" is powered and generates its 3.3V. VBus is also at 5V and feed the '''Lipo Charger''' that charges the Lipo. On the other hand the Lipo being connected, its current voltages (say 4.2V at full charge) feed the '''Lipo 3V3 Reg''' and the '''Vsys''' on the MCU board. As a result, the "Cansat Base" is also powered with 3.3V (including the radio module).  

{{underline|'''When USB plugged on MCU board :'''}}<br />The "MCU board" is powered and generates its 3.3V. VBus is also at 5V and feed the '''Lipo Charger''' that charges the Lipo. On the other hand the Lipo being connected, its current voltages (say 4.2V at full charge) feed the '''Lipo 3V3 Reg''' and the '''Vsys''' on the MCU board. As a result, the "Cansat Base" is also powered with 3.3V (including the radio module).  

Remarks:

Remarks:

{{underline|'''When USB unplugged :'''}} the Lipo is not charging. The Lipo will discharge into the '''Lipo 3V3 Reg''' and MCU board '''Vsys'''. The MCU board and Cansat Base are powered.  

{{underline|'''When USB unplugged :'''}}<br />the Lipo is not charging. The Lipo will discharge into the '''Lipo 3V3 Reg''' and MCU board '''Vsys'''. The MCU board and Cansat Base are powered.  

Remarks:

Remarks:

{{underline|'''When Lipo is unconnected :'''}} no power can be charged into the Lipo and Lipo cannot get discharged into the voltage regulators. When plugged onto USB the power flow from Vbus to '''Lipo 3V3 Reg''' (bypassing the '''Lipo charger''' circuitry). So, the Cansat project can be powered from USB for testing purpose.

{{underline|'''When Lipo is unconnected :'''}}<br />no power can be charged into the Lipo and Lipo cannot get discharged into the voltage regulators. When plugged onto USB the power flow from Vbus to '''Lipo 3V3 Reg''' (bypassing the '''Lipo charger''' circuitry). So, the Cansat project can be powered from USB for testing purpose.

Remarks:

Remarks:

{{underline|'''When another voltage required :'''}} xxx

{{underline|'''When another voltage required :'''}}<br />The Vbat pads are available for you to connect a step-up voltage regulator to produce higher voltage from the Lipo battery. Just keep in mind that General Lipo cannot be discharged over 1*C (meaning 1200mAh battery cannot discharge over 1*1200mA before getting the protection activated).

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