
© Copyright ARM Limited 2016. All rights reserved.
WH000
ARM-EPM-1017464.0
Confidential
Page 7
3.2.2
Battery Supplies
The Eval board may be powered by one of three on-
board batteries. First, the “Power Mode Switch” along the
center right edge of the board must be slid towards the bottom of the board in the “Battery” position (towards the 3
battery slide switches).
You may now select one of three batteries to power the board via the 3 Battery switches along the right lower side
of the board.
3.3V Lithium Coin cell
1.5 V AAA Alkaline cell
1.2V Zinc/Air Button battery
A given battery is selected by sliding a switch to t
he “ON” position (towards the center of the board).
PLEASE NOTE:
Only one battery switch may be ON at any time
. To prevent multiple power sources being
applied at the same time, if two or more of the 3 battery switches are “ON” at the same time, all 3 battery sources
will be disabled.
When the board is not in use, or is being transported, place all 3 battery switches in the “OFF” position (towards
the edge of the board) to conserve battery life. Simply placing the main Power Mode Switch in the “Line” position
does not disable the batteries from powering their respective regulators.
3.2.3
1v / 3V Mode Switch
The Cordio BT4 IP block can be powered via either a 1 volt or 3 volt rail. Switch S11, labeled
as “BT4 Power” on
the top right corner of the board, selects what power mode the BT4 IP block will be run in.
The 1 volt mode can be selected regardless if the board is being powered by line power or any one of the 3
different battery supplies.
The 3 volt mode is only valid when powering the board via 5v line power or by the 3.3v Lithium battery. 3 volt
mode is not functional when powering the board via the 1.5v AAA or 1.2 Zinc/Air batteries.
PLEASE NOTE: DO NOT SWITCH POWER MODES WHEN POWER IS SUPPLIED TO THE BOARD AS THIS
MAY PERMENTANTLY DAMAGE THE SOC. Always power-down the board prior to moving this switch
position!