ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 323

• Manufacturer Part Number: ATxmega128B1
• Manufacturer: Atmel Corporation

Specifications of ATxmega128B1

• Flash (kbytes): 128 Kbytes
• Pin Count: 100
• Max. Operating Frequency: 32 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 53
• Ext Interrupts: 53
• Usb Transceiver: 1
• Usb Speed: Full Speed
• Usb Interface: Device
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Segment Lcd: 160
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 16
• Adc Resolution (bits): 12
• Adc Speed (ksps): 2000
• Analog Comparators: 4
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: AES/DES
• Sram (kbytes): 8
• Eeprom (bytes): 2048
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.6 to 3.6
• Operating Voltage (vcc): 1.6 to 3.6
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 10
• Input Capture Channels: 10
• Pwm Channels: 10
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

25. ADC – Analog-to-Digital Converter
25.1
25.2
8291A–AVR–10/11
Features
Overview
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The ADC converts analog signals to digital values. The ADC has 12-bit resolution and is capable
of converting up to 300 thousand samples per second (kSPS). The input selection is flexible,
and both single-ended and differential measurements can be done. For differential measure-
ments, an optional gain stage is available to increase the dynamic range. In addition, several
internal signal inputs are available. The ADC can provide both signed and unsigned results.
The ADC measurements can either be started by application software or an incoming event from
another peripheral in the device. The ADC measurements can be started with predictable timing,
and without software intervention. It is possible to use DMA to move ADC results directly to
memory or peripherals when conversions are done.
Both internal and external reference voltages can be used. An integrated temperature sensor is
available for use with the ADC. The V
the ADC.
The ADC has a compare function for accurate monitoring of user defined thresholds with mini-
mum software intervention required.
12-bit resolution
Up to 300 thousand samples per second
Differential and single-ended input
Built-in differential gain stage
Single, continuous and scan conversion options
Three internal inputs
Internal and external reference options
Compare function for accurate monitoring of user defined thresholds
Optional DMA transfer of conversion results
Optional event triggered conversion for accurate timing
Optional interrupt/event on compare result
– Down to 2.3µs conversion time with 8-bit resolution
– Down to 3.35µs conversion time with 12-bit resolution
– Up to 16 single-ended inputs
– 16x4 differential inputs without gain
– 16x4 differential input with gain
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– Internal temperature sensor
– V
– 1.1V bandgap voltage
1/2
CC
x, 1x, 2x, 4x, 8x, 16x, 32x, and 64x gain options
voltage divided by 10
CC
/10 and the bandgap voltage can also be measured by
Atmel AVR XMEGA B
323