ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 325

• 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

25.3.2
25.3.3
8291A–AVR–10/11
Differential Input with Gain
Single-ended Input
Figure 25-2. Differential measurement without gain.
When differential input with gain is enabled, all input pins can be selected as positive input, and
input pins 4 to 7 can be selected as negative input. When gain is enabled, the differential input is
first sampled and amplified by the gain stage before the result is converted. The ADC must be in
signed mode when differential input with gain is used.
The gain is selectable to 1/2x, 1x, 2x, 4x, 8x, 16x, 32x, and 64x gain.
Figure 25-3. Differential measurement with gain.
For single-ended measurements, all input pins can be used as inputs. Single-ended measure-
ments can be done in both signed and unsigned mode.
The negative input is connected to internal ground in signed mode.
INTGND
ADC15
ADC0
ADC4
ADC7
GND
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INTGND
ADC15
ADC0
ADC0
ADC3
GND
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½x - 64x
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-
Atmel AVR XMEGA B
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