ATxmega128B1 Atmel Corporation, ATxmega128B1 Datasheet - Page 350

• 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

26. AC – Analog Comparator
26.1
26.2
8291A–AVR–10/11
Features
Overview
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The analog comparator (AC) compares the voltage levels on two inputs and gives a digital out-
put based on this comparison. The analog comparator may be configured to generate interrupt
requests and/or events upon several different combinations of input change.
The important property of the analog comparator’s dynamic behavior is the hysteresis. It can be
adjusted in order to achieve the optimal operation for each application.
The input selection includes analog port pins, several internal signals, and a 64-level program-
mable voltage scaler. The analog comparator output state can also be output on a pin for use by
external devices.
A constant current source can be enabled and output on a selectable pin. This can be used to
replace, for example, external resistors used to charge capacitors in capacitive touch sensing
applications.
The analog comparators are always grouped in pairs on each port. These are called analog
comparator 0 (AC0) and analog comparator 1 (AC1). They have identical behavior, but separate
control registers. Used as pair, they can be set in window mode to compare a signal to a voltage
range instead of a voltage level.
Selectable hysteresis
Analog comparator output available on pin
Flexible input selection
Interrupt and event generation on:
Window function interrupt and event generation on:
Constant current source with configurable output pin selection
– Small
– Large
– All pins on the port
– Bandgap reference voltage
– A 64-level programmable voltage scaler of the internal V
– Rising edge
– Falling edge
– Toggle
– Signal above window
– Signal inside window
– Signal below window
Atmel AVR XMEGA B
CC
voltage
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