ATxmega128D4 Atmel Corporation, ATxmega128D4 Datasheet - Page 229
ATxmega128D4
Manufacturer Part Number
ATxmega128D4
Description
Manufacturer
Atmel Corporation
Specifications of ATxmega128D4
Flash (kbytes)
128 Kbytes
Pin Count
44
Max. Operating Frequency
32 MHz
Cpu
8-bit AVR
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)
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
4
Output Compare Channels
14
Input Capture Channels
14
Pwm Channels
14
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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20.4
20.5
8210B–AVR–04/10
Voltage reference selection
Conversion Result
The following voltages can be used as the voltage reference (VREF) for the ADC:
•
•
•
•
Figure 20-8. ADC voltage reference selection
The ADC can be set up to be either in signed or in unsigned mode.
In signed mode, both negative and positive voltages can be measured, both for single ended
and differential input. With 12-bit resolution, the TOP value of a signed result is 2047 and the
results will be in the range -2048 to +2047 (0xF800 - 0x07FF). In unsigned mode the TOP value
is 4095 and results will be in the range 0 - 4095 (0 - 0x0FFF).
Signed mode must be used when any of the ADC inputs are set up for differential measure-
ments. In unsigned mode only single ended or internal signals can be measured.
The result of the analog to digital conversion is written to the result registers, RES.
In signed mode the ADC transfer function can be written as:
VINP and VINN are the positive and negative inputs to the ADC. GAIN is 1 unless differential
measurement with gain is used.
In unsigned mode the ADC transfer functions can be written as:
VINP is the single ended or internal input.
The application software selects if an 8- or 12-bit result should be generated. A result with lower
resolution will be available faster. See the
a description on how to calculate the propagation delay for.
The result register is 16-bit. An 8-bit result is always represented right adjusted in the 16-bit
result registers. Right adjusted means that the 8 LSB is found in the low byte. A 12-bit result can
Accurate internal 1.00 V voltage.
Internal V
External voltage applied to AREF pin on PORTA.
External voltage applied to AREF pin on PORTB.
RES
RES
=
CC
VINP - VINN
-------------------------------- - GAIN TOP
/1.6 voltage.
=
VREF
VINP - (-ΔV )
--------------------------------- - TOP
VREF
⋅
⋅
Internal VCC/1.6
Internal 1.00V
⋅
AREFA
AREFB
”ADC Clock and Conversion Timing” on page 231
VREF
XMEGA D
229
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