ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 324

• 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

Figure 25-1. ADC overview.
25.3
25.3.1
8291A–AVR–10/11
Input Sources
Differential Input
ADC15
ADC0
ADC0
ADC7
•
•
•
•
•
•
Internal
signals
Input sources are the voltage inputs that the ADC can measure and convert. Four types of mea-
surements can be selected:
The input pins are used for single-ended and differential input, while the internal inputs are
directly available inside the device. In devices with two ADCs, PORTA pins can be input to
ADCA and PORTB pins can be input to ADCB. For the devices with only one ADC, input pins
may be available for ADCB on both PORTA and PORTB.
The ADC is differential, and so for single-ended measurements the negative input is connected
to a fixed internal value. The four types of measurements and their corresponding input options
are shown in
When differential input is enabled, all input pins can be selected as positive input, and input pins
0 to 3 can be selected as negative input. The ADC must be in signed mode when differential
input is used.
• Differential input
• Differential input with gain
• Single-ended input
• Internal input
CH0.CTRL
CH0.MUXCTRL
Internal VCC/1.6V
Internal VCC/2
Internal 1.00V
Figure 25-2 on page 325
V
V
INP
INN
AREFA
AREFB
REFCTRL
V
IN
ADC
Reference
Voltage
S&H
Digital Correction Logic
2 bits
clk
DAC
ADC
Stage
CTRLA
CTRLB
2
Enable
Start
Mode
Resolution
1
Σ
to
Stage
2
2
2x
Figure 25-6 on page
EVCTRL
Action
Select
V
OUT
CH0 Result
Compare
Register
Atmel AVR XMEGA B
327.
<
>
Threshold
(Int Req)
324