AT32UC3L0256 Atmel Corporation, AT32UC3L0256 Datasheet - Page 604

• Manufacturer Part Number: AT32UC3L0256
• Manufacturer: Atmel Corporation

Specifications of AT32UC3L0256

• Flash (kbytes): 256 Kbytes
• Pin Count: 48
• Max. Operating Frequency: 50 MHz
• Cpu: 32-bit AVR
• # Of Touch Channels: 17
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 36
• Ext Interrupts: 36
• Usb Speed: No
• Usb Interface: No
• Spi: 5
• Twi (i2c): 2
• Uart: 4
• Lin: 4
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 12
• Adc Speed (ksps): 460
• Analog Comparators: 8
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 16
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.62 to 3.6
• Operating Voltage (vcc): 1.62 to 3.6
• Fpu: No
• Mpu / Mmu: Yes / No
• Timers: 6
• Output Compare Channels: 18
• Input Capture Channels: 12
• Pwm Channels: 35
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

26. ADC Interface (ADCIFB)
26.1
26.2
32145A–12/2011
Features
Overview
Rev:1.1.0.1
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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 ADVREFP.
The ADCIFB supports 8-bit and 10-bit resolution mode, in addition to enhanced resolution mode
with 11-bit and 12-bit resolution. 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 (TRIGGER), or by an integrated programmable timer.
When the Resistive Touch Screen Mode is enabled, an integrated sequencer automatically con-
figures the pad control signals and performs resistive 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
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
– Resistive Touch Screen position measurement
– Pen detection and pen loss detection
– ADC Mode
– Resistive 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
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