Low current draw on standby mode

October 28, 2015 in 8 Channel PDU by Joshua Oster-Morris

The next generation Motobrain hardware will draw 6.4mA in standby mode. It does not scan it’s inputs for triggers in this mode. It only waits for the key signal to turn on or the Bluetooth to connect.

How it works in practice is that when the key signal is off and no outputs are on we turn off all non essential hardware and slow the main clock chip way down. then every 8 seconds we turn it back on and look for a Bluetooth connection request. If we see one, we turn the device back on and continue where we left off.

The image below shows the current draw over time where one mV equals one mA. My integration of those values gave a weighted average of 6.4mA.