User's Manual

NINA-B1 series - Data Sheet
UBX-15019243 - R05 Early Production Information Interfaces
Page 13 of 35
2.6.4 Analog pin options
Table 5 shows the supported connections of the analog functions.
An analog pin may not be simultaneously connected to multiple functions.
Table 5: Possible uses of analog pin
2.7 NINA-B11x firmware features
This section describes the available features when using the u-blox NINA-B11x firmware. For additional
information, see the u-blox Short Range AT Commands Manual [3].
2.7.1 System status signals
The RED, GREEN and BLUE pins are used to signal the system status according to Table 6. They are active low
and are intended to be routed to an RGB LED.
Mode
Status
RGB LED Color
GREEN
BLUE
RED
Data mode
IDLE
Green
LOW
HIGH
HIGH
Command mode
IDLE
Orange
LOW
HIGH
LOW
Data mode, Command mode
CONNECTING*
Purple
HIGH
LOW
LOW
Data mode, Command mode
CONNECTED*
Blue
HIGH
HIGH
LOW
* = LED flashes on data activity
Table 6: System status indication
2.7.2 System control signals
The following input signals can be used to control the system.
 RESET_N is used to reset the system, see section 2.3.5.
 SWITCH_1 is used to enter the bootloader or to restore the UART serial settings to their default values.
 SWITCH_2 can be used to open a BLE connection to a peripheral device.
 If both SWITCH_1 and SWITCH_2 are driven low during start up, the system will restore all settings to
their factory defaults.
2.7.3 UART signals
In addition to the normal RXD, TXD, CTS, and RTS signals, the NINA-B11x firmware adds the DSR and DTR pins
to the UART interface. Note that they are not used as originally intended, but to control the state of the NINA
module. Depending on the current configuration, the DSR can be used to:
 Enter command mode
 Disconnect and/or toggle connectable status
 Enable/disable the rest of the UART interface
 Enter/wake up from sleep mode
Analog function
Can be connected to
ADC single-ended input
Any analog pin or VCC
ADC differential input
Any analog pin or VCC pair
Comparator IN+
Any analog pin
Comparator IN-
Pin 24 or 25, VCC, 1.2 V, 1.8 V, 2.4 V
Low-power comparator IN+
Any analog pin
Low-power comparator IN-
Pin 24 or 25, 1/16 to 15/16 VCC in steps of 1/16 VCC