Power output

[charlespax]

I want the board to be able to output as much power as possible. I may need to select another 3.3V regulator.

• What can we draw from the battery?
• What can the 3.3V regulator output?

[electrokean]

If you gave up one of the ground pins on the modules, you could route VBAT or VBUS to them.

Or just allow for a pad on one of these for people wanting to hack to easily wire a jumper across to a module.

[charlespax]

It turns out the CAN and USB use the same memory and cannot be used together. Thus, I'm dropping CAN from the interface. Not a big deal. This frees up two pins. The fourteen pin connector will have the following pins.

• 3V3
• 3V3
• VBUS
• GND
• GND
• SPI_MISO
• SPI_MOSI
• SPI_SCK
• GPIO1
• GPIO2
• USART_RX
• USART_TX
• I2C_SD
• I2C_SCL

With the addition of VBUS to the module a design could draw directly from USB power or from the battery. Anything beyond that and a design could have an independent power input.

[charlespax]

Each connector has a pin for VBUS. Closing issue.