AT32UC3L064_1 ATMEL [ATMEL Corporation], AT32UC3L064_1 Datasheet - Page 606

• Manufacturer Part Number: AT32UC3L064_1
• Description: AVR32 32-bit Microcontroller
• Manufacturer: ATMEL [ATMEL Corporation]

26. ADC Interface (ADCIFB)
26.1
26.2
32099A–AVR32–06/09
Features
Overview
Rev.:1.0.1.0
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The ADC Interface (ADCIFB) converts analog input voltages to digital values. The ADCIFB is
based on a Successive Approximation Register (SAR) 10-bit Analog-to-Digital Converter (ADC).
The conversions extend from 0V to ADVREF.
The ADCIFB supports 8-bit, 10-bit, 11-bit, or 12-bit resolution mode, and conversion results are
reported in a common register for all channels.
The 11-bit and 12-bit resolution modes are obtained by interpolating multiple samples to acquire
better accuracy. For 11-bit mode 4 samples are used, which gives an effective sample rate of
1/4 of the actual sample frequency. For 12-bit mode 16 samples are used, giving a effective
sample rate of 1/16 of actual. This arrangement allows conversion speed to be traded for better
accuracy.
Conversions can be started for all enabled channels, either by a software trigger, by detection of
a level change on the external trigger pin (ADTRG), or by an integrated programmable timer.
When the Touch Screen ADC Mode is enabled, an integrated sequencer automatically config-
ures the pad control signals and performs touch screen conversions.
The ADCIFB also integrates an ADC Sleep Mode, a Pen-Detect Mode, and an Analog Compare
Mode, and connects with one Peripheral DMA Controller channel. These features reduce both
power consumption and processor intervention.
Multi-channel Analog-to-Digital Converter with up to 12-bit resolution
Enhanced Resolution Mode
Pseudorandom Noise Generator used for Enhanced Resolution Mode
Glueless interface with resistive touch screen panel, allowing
Integrated enhanced sequencer
Numerous trigger sources
ADC Sleep Mode for low power ADC applications
Programmable ADC timings
– 11-bit resolution obtained by interpolating 4 samples
– 12-bit resolution obtained by interpolating 16 samples
– Touch Screen position measurement
– Pen detection and pen loss detection
– ADC Mode
– Touch Screen Mode
– Software
– Embedded 16-bit timer for periodic trigger
– Pen detect trigger
– Continuous trigger
– External trigger, rising, falling or any-edge trigger
– Peripheral event trigger
– Programmable ADC clock
– Programmable startup time
AT32UC3L
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