ATxmega32D4 Atmel Corporation, ATxmega32D4 Datasheet - Page 228
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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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8210B–AVR–04/10
V
Thus, V
Some of the internal signals need to be turned on before they can be used measured. 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 characteristics in the
device datasheets 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 20-6. 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 230
Figure 20-7. Internal measurements in unsigned mode
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
BANDGAP REF
BANDGAP REF
VCC SCALED
VCC SCALED
for details.
TEMP REF
TEMP REF
VREF
2
−
Δ
V
CC
of 3.6 V will be measured as 0.36 V.
+
+
-
-
ADC
ADC
XMEGA D
Figure 20-
228