Normally connected to the 5V regulator. Can be disconnected by cutting “5V:5V” solder jumper.
3.3V
Always connected to 3.3V regulator.
GND
Always connected to ground net.
Vin
Normally disconnected. Allows user to connect 5V regulator to Vin pin. This is needed for certain boards (pcDuino, Intel Galileo, ect.). Can be connected with 5V:Vin solder jumper.
RAW
This pin provides unregulated power from the battery that does not switch off. It also has a higher maximum current than the regulated pins. It is useful for powering parts of a project that need power even when the shield is switched off (example, an LCD screen).
EN
This pin allows the shield to be turned on without using the switch. Connect this pin to the RAW pin will activate the power outputs while the switch is in the OFF position. (1 kΩ Input)
All other pins on the energyShield 2 Basic are not connected. They serve as pass-throughs for the Arduino Headers.
Circuit Descriptions
Circuit Number/RefDes (Noted with blue boxes)
Description
1 / U101
USB Charger. This IC controls the USB charging of the LiPo battery.
2 / U201
5V Boost Switching Regulator
3 / U202
3.3V Linear Regulator
Power Pin Specifications
Description
Specification
USB Input Voltage
5V
USB Input Current
500mA Max
5V Output Current
1000mA Max
3.3V Output Current
300mA Max
RAW Pin Output Voltage
3V – 4.2V (Battery Voltage)
RAW Pin Output Current
1800mA Max
Logic Level Pin Specifications
Description
Specification
EN (Enable Pin) Logic Threshold
1.5V
EN (Enable Pin) Voltage Tolerance
0 – 5V
Power Flow Chart
This flow chart illustrates how power is handled in the energyShield 2 Basic.
