Board Features
EPM-19 Hardware Reference Manual
19
O
PERATING THE
B
OARD WITHOUT A
B
ATTERY
The EPM-19 enables you to operate the board without a battery for applications when no battery
is required. Using this setting will delay the board’s booting process after power on for
approximately 5 seconds. This is an application requirement to give the RTC crystal time to start
up.
Table 7: No Battery Mode Jumper Truth Table
V2 Jumper Position
Condition
Pin 2-3 (default)
Battery is installed or will be used
Pin 1-2
Battery is not present and not in use
Figure 12. Location of the V2 No Battery Mode Jumper
To operate the board without the Lithium battery, perform the following steps:
1.
Power down the EPM-19.
2.
Remove the battery connection to the SoC RTC well. This is done by removing the V4
jumper leaving pins 1 and 2 unconnected if you want to keep the battery with the product
(otherwise the on-board battery would have to be unsoldered). You can store the V4
jumper in its default position connected only to pin 1.
3.
Make certain there are no other batteries connected to the board; that is, either attached
to the J11 external battery connector or on the CBR-4005B paddleboard. If you are
using the CBR-4005B paddleboard, remove the battery from its socket.
4.
Set the V2 jumper to pins 1-2. (Always make sure the battery is disconnected when this
jumper setting is used or it will drain the battery and delay booting of the board.)
5.
Power up the EPM-19. The board takes approximately five seconds to begin the boot
sequence after the power switch is turned on when the battery is not in use. This delay is
necessary for the RTC crystal operation to stabilize before the board reset is released.
