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Hardware Reference - energyShield 2 Basic

Hardware Overview

Pin Descriptions

Pin NameDescription
5VNormally connected to the 5V regulator. Can be disconnected by cutting “5V:5V” solder jumper.
3.3VAlways connected to 3.3V regulator.
GNDAlways connected to ground net.
VinNormally 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 / U101USB Charger. This IC controls the USB charging of the LiPo battery.
2 / U2015V Boost Switching Regulator
3 / U2023.3V Linear Regulator

Power Pin Specifications

USB Input Voltage5V
USB Input Current500mA Max
5V Output Current1000mA Max
3.3V Output Current300mA Max
RAW Pin Output Voltage3V – 4.2V (Battery Voltage)
RAW Pin Output Current1800mA Max

Logic Level Pin Specifications

EN (Enable Pin) Logic Threshold1.5V
EN (Enable Pin) Voltage Tolerance0 – 5V


Power Flow Chart

This flow chart illustrates how power is handled in the energyShield 2 Basic.


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