M263 datasheet(335/398 Pages) NUVOTON

335 / 398 page

M261/M262/M263

Mar 25, 2020

Page 335 of 398

Rev 1.02

6.34

Enhanced 12-bit Analog-to-Digital Converter (EADC)

6.34.1

Overview

The chip contains one 12-bit successive approximation analog-to-digital converter (SAR ADC

converter) with 16 external input channels and 3 internal channels. The ADC converter can be started

by software trigger, EPWM0/1 triggers, BPWM0/1 triggers, timer0~3 overflow pulse triggers, ADINT0,

ADINT1 interrupt EOC (End of conversion) pulse trigger and external pin (EADC0_ST) input signal.

6.34.2

Features



Analog input voltage range: 0~ VREF (Max to 3.6V)



Reference voltage from VREF pin



12-bit resolution and 10-bit accuracy is guaranteed



Up to 16 single-end analog external input channels or 8 pair differential analog input

channels



Up to 3 internal channels, they are band-gap voltage (VBG), temperature sensor (VTEMP),

and Battery power (VBAT)



Four ADC interrupts (ADINT0~3) with individual interrupt vector addresses



Maximum ADC clock frequency is 48 MHz



Up to 3.43 MSPS conversion rate



Configurable ADC internal sampling time.



12-bit, 10-bit, 8-bit, 6-bit configurable resolution.



Supports calibration and load calibration words capability.



Supports internal reference voltage VREF: 1.6V, 2.0V, 2.5V, and 3.0V.



Supports three power saving modes:

–

Deep Power-down mode

–

Power-down mode

–

Standby mode



Up to 19 sample modules

–

Each of sample modules which is configurable for ADC converter channel

EADC_CH0~15 and trigger source

–

Sample module 16~18 is fixed for ADC channel 16, 17, 18 input sources as band-gap

voltage, temperature sensor, and battery power (VBAT)

–

Double buffer for sample control logic module 0~3

–

Configurable sampling time for each sample module

–

Conversion results are held in 19 data registers with valid and overrun indicators



An ADC conversion can be started by:

–

Write 1 to SWTRGn (EADC_SWTRG[n], n = 0~18)

–

External pin EADC0_ST

–

Timer0~3 overflow pulse triggers

–

ADINT0 and ADINT1 interrupt EOC (End of conversion) pulse triggers

–

EPWM/BPWM triggers

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