EVK-NINA-B4 - User guide
UBX-19054587 - R03
Board configuration
Page 18 of 38
C1 - Public
Battery powered with protection diode, 2.7 – 1.7 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 on the module’s
power supply lines that will typically damage a non-chargeable battery. To prevent this damage, a
schottky diode is added in series to the battery, which will block any back current surges. A jumper
should 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 11: Jumper positions for battery powered operation with a protection diode (dashed lines show optional jumpers)
Connector
Add jumper to pins
Description
J7
3, 4
Selects the diode protected battery as a 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 5: Jumper positions for battery powered operation with a protection diode (with two optional jumpers)
J7
B
OA
R
D
B
A
TT D
IOD
E
3V3
3
4
2
1
J22
V
C
C
_I
O
VC
C
3
4
9
10
NINA module power
board I/O power
(optional)
J22: 2-4
J22: 1-3
PC communication
(optional)
MCU
J7: 9-10
J7: 3-4
Battery powered
with protection
