UBX-21008123 - R02
Board configuration
Page 19 of 42
C1-Public
Battery powered, 3.0 – 1.7 V
The configuration for using EVK-ANNA-B4 with a battery is shown Figure 9. In this configuration the
battery voltage is connected to
VCC_ANNA
, which in turn is connected to the ANNA-B4 VCC supply.
If necessary, add jumper to pins 2 and 4 of J22 to supply LEDs and other peripherals with power – but
only if this does not exceed the maximum current rating of the battery. If the ANNA module must be
configured, add jumper to pins 9 and 10 of J7 to connect the
VDD_MCU
net and enable
communications between a PC and the ANNA module.
☞
Pins 9 and10 of J7 and pins 2 and 4 of J22 must be connected to communicate with the ANNA
module from a PC. As connecting an extra board peripheral might deplete the battery, the EVB
power configuration should be switched to the default 3.3 V configuration.
⚠
To avoid damage to the battery, do not connect pins 5 and 6 and pins 7 and 8 on J7 at the same
time the battery is connected.
Figure 9: Jumper positions for battery powered operation, the jumpers shown in dashed lines are optional
Connector
Add jumper to pins
Description
J7
5, 6
Selects the battery connected to the battery holder as the source for the VCC_ANNA net
9, 10
(Optional) Powers up interfaces to the MCU, USB hub, and UART to USB converter with
3.3 V
J22
1, 3
Powers up the ANNA module. The ANNA VCC and VCC_IO pins are connected to the
chosen source for the VCC_ANNA net.
2, 4
(Optional) Powers up peripherals directly connected to the ANNA module, such as LEDs
and external memory, using the voltage supply to the module.
Table 4: Jumper positions for battery powered operation, two jumpers are optional
J7
B
OA
R
D
B
A
TT
3V3
3
4
2
1
J22
V
C
C_
IO
VC
C
5
6
9
10
ANNA module power
board I/O power
(optional)
J22: 2-4
J22: 1-3
PC communication
(optional)
MCU
J7: 9-10
Battery powered
J7: 5-6
