EVK-NINA-B3 - User Guide
UBX-17056481 - R03
Product description
Page 18 of 31
1.9
Buttons and LEDs
Figure 13: Position of the push-buttons and LEDs on the evaluation board
Annotation
Function
Description
SW0
Reset button
Connected directly to the NINA RESET_N pin.
SW1
User button
Push button for application use. Connected directly to the NINA SWITCH_1
(GPIO_7) pin
SW2
User button
Push button for application use. Connected directly to the NINA SWITCH_2
(GPIO_18) pin
Table 11: EVK-NINA-B3 buttons
Annotation
Function
Description
Color
DS1
UART CTS LED
Connected to the NINA UART_CTS (GPIO_21) pin via jumper header J9
DS2
UART RTS LED
Connected to the NINA UART_RTS (GPIO_20) pin via jumper header J9
DS3
Interface MCU LED
Blinks on USB enumeration and activity, lit when the Interface MCU is
connected via USB
DS4
Interface MCU LED
Error LED
DS5
UART DTR LED
Connected to the NINA UART_DTR (GPIO_16) pin via jumper header J9
DS6
UART DSR LED
Connected to the NINA UART_DSR (GPIO_17) pin via jumper header J9
DS7
UART TXD LED
Connected to the NINA UART_TXD (GPIO_22) pin via jumper header J9
DS8
UART RXD LED
Connected to the NINA UART_RXD (GPIO_23) pin via jumper header J9
DS9
RGB LED
Connected to the NINA RED (GPIO_1), GREEN (GPIO_7) and BLUE (GPIO_8)
pins via jumper header J19
Table 12: EVK-NINA-B3 LED indicators
1.10
Disconnecting NINA signals from board peripherals
All evaluation board peripherals, such as level shifters, LEDs, and the interface MCU will be connected
to the NINA-B3 module by default. This might not suit all evaluation scenarios. All peripherals can be
switched off by disconnecting their power supplies (see section 1.6), but if only specific signals have
to be isolated, it will require finer control. All the NINA module signals that are connected to board
peripherals have thus been routed via jumper headers, so that jumpers can be pulled or added as
needed by the evaluation board user, isolating, or connecting specific signals. Figure 14 shows the
layout of these jumper headers.
