NINA-B1 series - System Integration Manual
UBX-15026175 - R06 System description
Page 13 of 48
External pull up resistors are required for the I
2
C interface. The value of the pull up resistor should be selected
depending on the speed and capacitance of the bus.
1.7 GPIO pins
The NINA-B1 series module can provide up to 19 pins, which can be configured as general purpose input or
output. 7 GPIO pins are capable of handling analog functionality. All pins are capable of handling interrupt.
Function Description Default
NINA-B1 pin
Configurable
GPIOs
General purpose input Digital input with configurable edge detection and interrupt generation. Any
General purpose output Digital output with configurable drive strength, pull-up, pull-down, open-
source, open-drain and/or slew rate.
Any
Pin disabled Pin is disconnected from input buffers and output drivers. All* Any
Timer/ counter High precision time measurement between two pulses/ Pulse counting with
interrupt/event generation.
Any
Interrupt/ Event trigger Interrupt/event trigger to the software application/ Wake up event. Any
ADC input 8/10/12-bit analog to digital converter Any analog
Analog comparator input Compare two voltages, capable of generating wake-up events and
interrupts
Any analog
PWM output Output complex pulse width modulation waveforms Any
Connection status
indication
Indicates if a BLE connection is maintained BLUE** Any
* = If left unconfigured ** = If using u-blox connectivity software
Table 5: GPIO custom functions configuration
1.7.1 Analog interfaces
7 out of the 19 digital GPIOs can be multiplexed to analog functions. The following analog functions are
available for use:
• 1x 7-channel ADC
• 1x Analog comparator*
• 1x Low-power analog comparator*
*Only one of the comparators can be used simultaneously.
1.7.1.1 ADC
The Analog to Digital Converter (ADC) can sample up to 200 kHz using different inputs as sample triggers.
Table 6 shows the sample speed in correlation to the maximum source impedance. It supports 8/10/12-bit
resolution. Any of the 7 analog inputs can be used both as single-ended inputs and as differential pairs for
measuring the voltage across them. The ADC supports full 0 V to VCC input range.
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