ATxmega32D4 Atmel Corporation, ATxmega32D4 Datasheet - Page 227
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ATxmega32D4
Manufacturer Part Number
ATxmega32D4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega32D4
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
4
Twi (i2c)
2
Uart
2
Graphic Lcd
No
Video Decoder
No
Camera Interface
No
Adc Channels
12
Adc Resolution (bits)
12
Adc Speed (ksps)
200
Analog Comparators
2
Resistive Touch Screen
No
Temp. Sensor
Yes
Crypto Engine
No
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
4
Output Compare Channels
14
Input Capture Channels
14
Pwm Channels
14
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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Company
Part Number
Manufacturer
Quantity
Price
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20.3.4
8210B–AVR–04/10
Internal inputs
The negative input is connected to internal ground in signed mode.
Figure 20-4. Single-ended measurement in signed mode
In unsigned mode the negative input is connected to half of the voltage reference (VREF) volt-
age minus a fixed offset. The nominal value for the offset is:
Since the ADC is differential, unsigned mode is achieved by dividing the reference by two inter-
nally, resulting in an input range from VREF to zero for the positive single ended input. The
offset enables the ADC to measure zero cross detection in unsigned mode, and to calibrate any
positive offset where the internal ground in the device is higher than the external ground. See
Figure 20-11 on page 230
Figure 20-5. Single ended measurement in unsigned mode
Three internal analog signals can be selected as input and measured by the ADC.
The voltage output from an internal temperature reference can be measured with the ADC and
the voltage output will give an ADC result representing the current temperature in the microcon-
troller. During production test, the ADC measures a fixed temperature using the internal
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.
• Temperature sensor
• Bandgap voltage
• V
CC
scaled
ADC14
ADC15
ADC14
ADC15
ADC...
ADC0
ADC1
ADC2
ADC3
ADC0
ADC1
ADC2
ADC3
...
...
...
for details.
ΔV
VREF
=
2
VREF 0.05
−
Δ
V
×
+
-
+
-
ADC
ADC
XMEGA D
227