Data Sheet

NUC123
May 3, 2017 Page 65 of 99 Rev.2.04
NUC123 SERIES DATASHEET
Analog-to-Digital Converter (ADC) 6.17
6.17.1 Overview
NuMicro
®
NUC123 Series contains one 10-bit successive approximation analog-to-digital
converters (SAR A/D converter) with 8 input channels. The A/D converter supports three
operation modes: single, single-cycle scan and continuous scan mode. The A/D converters can
be started by software, PWM center-aligned trigger and external STADC pin.
6.17.2 Features
 Conversion range : 0 to AV
DD
 10-bit resolution and 8-bit accuracy is guaranteed
 Up to 8 single-end analog input channels
 Maximum ADC clock frequency as 6 MHz (NUC123xxxANx Only)
 Maximum ADC clock frequency as 3 MHz (NUC123xxxAEx Only)
 Up to 166 kSPS (Samples Per Second) conversion rate (NUC123xxxANx Only)
 Up to 200 kSPS (Samples Per Second) conversion rate (NUC123xxxAEx Only)
 Three operating modes
– Single mode: A/D conversion is performed one time on a specified channel
– Single-cycle Scan mode: A/D conversion is performed one cycle on all specified
channels with the sequence from the lowest numbered channel to the highest
numbered channel
– Continuous Scan mode: A/D converter continuously performs Single-cycle scan mode
until software stops A/D conversion
 A/D conversion started by:
– Software writes 1 to ADST bit
– External pin STADC (PB.8)
– PWM center-aligned trigger
 Supports 8 data registers to stored conversion result with valid and overrun indicators
 Supports 2 sets of digital comparators to monitor conversion result of specified channel and
to generate an interrupt when conversion result matches comparison condition
 Channel 7 supports 2 input sources: external analog voltage and internal band-gap voltage
 Supports PDMA transfer