EVK-NINA-B3 - User Guide
UBX-17056481 - R03
Product description
Page 10 of 31
Connector
annotation
Add jumper
to pins
Description
J7
7, 8
Selects the board regulated 3.3 V net as source for the VDD_NINA net.
9, 10
Powers up the Interface MCU, USB hub, and UART to USB converter with 3.3 V.
J22
1, 3
Powers up the NINA module. The NINA VCC and VCC_IO pins are connected to the selected
source for the VDD_NINA net.
2, 4
Powers up the peripherals directly connected to NINA such as LEDs and external memory with
the NINA supply voltage.
Table 3: Jumper positions for default power configuration
1.6.3
Battery powered, 3 V
When using a battery, Figure 7 shows the default configuration. The battery voltage is connected to
VDD_NINA, which in turn, is connected to the NINA-B3 VCC supply. If needed, a jumper can be added
to J22 pins 2 and 4 to supply LEDs and other peripherals with power, as long as this does not exceed
the maximum current rating of the battery. If the NINA module has to be configured, the VDD_MCU
net can be connected to enable PC communications by adding a jumper to J7 pins 9 and 10.
Figure 7: Jumper positions for battery powered operation, two jumpers are optional
Connector
annotation
Add jumper
to pins
Description
J7
5, 6
Selects the battery connected to the battery holder as source for the VDD_NINA net.
9, 10
(Optional) Powers up the Interface MCU, USB hub, and UART to USB converter with 3.3 V.
J22
1, 3
Powers up the NINA module. The NINA VCC and VCC_IO pins are connected to the selected
source for the VDD_NINA net.
2, 4
(Optional) Powers up the peripherals directly connected to NINA such as LEDs and external
memory with the NINA supply voltage.
Table 4: Jumper positions for battery powered operation, two jumpers are optional
1.6.4
Battery powered with protection diode, 2.7 V
This use case is meant to protect the battery from current back surges. When using the NFC
interface, there is a risk that the applied electromagnetic field can cause back surges that will typically
damage a non-chargeable battery. To prevent this damage, a schottky diode can be added in series
to the battery, which will block any back current surges. A jumper should then be added to J7 pins - 3
and 4 instead of 5 and 6.
The diode will lower the voltage level of the battery by about 0.3 V.
Figure 8: Jumper positions for battery powered operation with a protection diode, two jumpers are optional
