SAM4L Datasheet, PDF (989/1185 Pages) ATMEL Corporation – ATSAM ARM-based Flash MCU

ATSAM4L4/L2
38. ADC Interface (ADCIFE)
Rev. 1.0.0.0
38.1 Features
• Multi-channel Analog-to-Digital Converter with 12-bit resolution
• Selectable single ended or differential input voltage
• Programmable gain per conversion
• selectable ADC voltage input reference per conversion
• Numerous trigger sources
– Software
– Embedded 16-bit timer for periodic trigger
– Continuous trigger
– Peripheral Event trigger
– External trigger, rising, falling or any-edge trigger
• Multiple sequencer modes:
– Run multiple sequences using DMA transfer
– Run a single conversion on a start-of-conversion
• Start of conversion or sequence without CPU intervention
• ADC Power Reduction Mode for low power ADC applications
• Window monitor, with selectable channel per conversion
• Programmable Sample & Hold time per conversion
38.2 Overview
The ADC interface (ADCIFE) converts analog input voltages to digital values. The ADCIFE is
based on a 12-bit Cyclic Pipeline topology to achieve sampling rates up to 300 KSPS (In differ-
ential mode without gain).
The ADC conversion results are reported in a common register for all channels. Conversions
can be started for all enabled channels, either by a software trigger, by detection of a level
change on the external trigger pin or event system, or by an integrated programmable 16-bit
timer.
This ADC has selectable single-ended or fully differential inputs and takes benefits from a pro-
grammable gain from x0.5 to x64 included.
The conversions extend from -Vref to +Vref. 16 external channels on both positive and negative
inputs can be managed.
The ADCIFE also integrates an Power Reduction mode, a Window Monitor mode, and connects
with two Peripheral DMA Controller channels (One Rx for configuration and one Tx for transfer-
ing results). These features reduce both power consumption and processor intervention.
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