ATxmega32A4 Atmel Corporation, ATxmega32A4 Datasheet - Page 293
ATxmega32A4
Manufacturer Part Number
ATxmega32A4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega32A4
Flash (kbytes)
32 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
34
Ext Interrupts
34
Usb Speed
No
Usb Interface
No
Spi
7
Twi (i2c)
2
Uart
5
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
2000
Analog Comparators
2
Resistive Touch Screen
No
Dac Channels
2
Dac Resolution (bits)
12
Temp. Sensor
Yes
Crypto Engine
AES/DES
Sram (kbytes)
4
Eeprom (bytes)
1024
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
5
Output Compare Channels
16
Input Capture Channels
16
Pwm Channels
16
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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25.4
8077H–AVR–12/09
ADC Channels
temperature sensor, and the value is store in the production calibration row and can be used for
temperature sensor calibration.
The bandgap voltage is an accurate voltage reference inside the microcontroller that is the
source for other internal voltage references.
V
Thus, V
The output from the DAC module can also be measured by the ADC. It is the output directly from
the DAC, and not the Sample and Hold (S/H) outputs, that is available for the ADC.
Some of the internal signals need to be turned on specifically before they can be used mea-
sured. Refer to the manual for these modules for details of how to turn them on. The sample rate
for the internal signals is lower than the maximum speed for the ADC, refer to the ADC charac-
teristics in the device data sheets for details on sample rate of the internal signals.
When measuring the internal signals, the negative input is connected to internal ground in
signed mode.
Figure 25-6. Internal measurements in signed mode
In unsigned mode the negative input is connected to a fixed value which is half of the voltage ref-
erence (VREF) minus a fixed offset as it is for single ended unsigned input. Refer to
11 on page 296
Figure 25-7. Internal measurements in unsigned mode
To facilitate the use of the ADC, the design implements four separate MUX control registers with
corresponding result registers. The MUX/result register pair is called an ADC channel, and this
is shown in
different input sources, use different start conversion triggers, and they use different events and
interrupts. The result is stored in different result registers.
CC
can be measured directly by scaling it down and dividing it by 10 before the ADC input.
CC
of 1.8 V will be measured as 0.18 V and V
Figure 25-1 on page
BANDGAP REF
BANDGAP REF
VCC SCALED
VCC SCALED
for details.
TEMP REF
TEMP REF
DAC
DAC
290. Each ADC channel can be set up individually to measure
VREF
2
−
Δ
V
CC
of 3.6 V will be measured as 0.36 V.
+
+
-
-
ADC
ADC
XMEGA A
Figure 25-
293
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