NINA-B1 series - System integration manual
UBX-15026175 - R16
System description
Page 12 of 63
C1-Public
1.8.1
Analog interfaces
8 out of the 19 digital GPIOs can be multiplexed to analog functions. The following analog functions
are available for use:
•
1x 8-channel ADC
•
1x Analog comparator*
•
1x Low-power analog comparator*
*Only one of the comparators can be used simultaneously.
ADC
The Analog to Digital Converter (ADC) samples up to 200 kHz using different inputs as sample
triggers. Table 5 shows the sample speed correlation with respect to the maximum source
impedance. It supports 8/10/12-bit resolution. Any of the 8 analog inputs can be used as single-ended
inputs and differential pairs to measure the input voltage. The ADC supports the full 0 V–VCC input
range.
Table 5: Acquisition versus source impedance
Comparator
The comparator compares voltages from any analog pin with different references, as shown in Table
6. It supports the full 0 V–VCC input range and can generate different software events for the rest of
the system.
Low power comparator
The low-power comparator operates in the same way as the normal comparator, with reduced
functionality. It can be used during system OFF modes as a wake-up source.
ACQ [us]
Maximum source resistance [k
Ω
]
3
10
5
40
10
100
15
200
20
400
40
800
