NRF9160-SICA-R7 datasheet(198/400 Pages) NORDIC

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Peripherals

6.11.10 Electrical specification

6.12 SAADC — Successive approximation analog-to-

digital converter

The SAADC is a differential successive approximation register (SAR) analog-to-digital converter.

Listed here are the main features of SAADC:

• 8/10/12-bit resolution, 14-bit resolution with oversampling

• Multiple analog inputs:

• AIN0 to AIN7 pins

• VDD_GPIO pin

• Up to eight input channels:

• One channel per single-ended input and two channels per differential input

• Scan mode can be configured with both single-ended channels and differential channels

• Each channel can be configured to select any of the above analog inputs

• Full scale input range (0 to VDD_GPIO)

• Sampling triggered via a task from software or a PPI channel for full flexibility on sample frequency

source from low-power 32.768 kHz RTC or more accurate 1/16 MHz timers

• One-shot conversion mode to sample a single channel

• Scan mode to sample a series of channels in sequence with configurable sample delay

• Support for direct sample transfer to RAM using EasyDMA

• Interrupts on single sample and full buffer events

• Samples stored as 16-bit two’s complement values for differential and single-ended sampling

• Continuous sampling without the need of an external timer

• Internal resistor string

• On-the-fly limit checking

6.12.1 Overview

The ADC supports up to eight external analog input channels. It can be operated in One-shot mode with

sampling under software control, or Continuous mode with a programmable sampling rate.

The analog inputs can be configured as eight single-ended inputs, four differential inputs or a combination

of these. Each channel can be configured to select:

•

AIN0 to AIN7 pins

•

VDD_GPIO pin

Channels can be sampled individually in one-shot or continuous sampling modes, or, using scan mode,

multiple channels can be sampled in sequence. Channels can also be oversampled to improve noise

performance.

4418_1315 v2.0

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NRF9160-SICA-R7 Datasheet(PDF) 198 Page - Nordic Semiconductor