ATXMEGA256A3-AU Atmel, ATXMEGA256A3-AU Datasheet - Page 111

• Manufacturer Part Number: ATXMEGA256A3-AU
• Description: MCU AVR 256K FLASH 1.8V 64-TQFP
• Manufacturer: Atmel
• Series: AVR® XMEGAr

Specifications of ATXMEGA256A3-AU

• Core Processor: AVR
• Core Size: 8/16-Bit
• Speed: 32MHz
• Connectivity: I²C, IrDA, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, DMA, POR, PWM, WDT
• Number Of I /o: 50
• Program Memory Size: 256KB (128K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 4K x 8
• Ram Size: 16K x 8
• Voltage - Supply (vcc/vdd): 1.6 V ~ 3.6 V
• Data Converters: A/D 16x12b; D/A 2x12b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Package: 64TQFP
• Device Core: AVR
• Family Name: XMEGA
• Maximum Speed: 32 MHz
• Operating Supply Voltage: 1.8|2.5|3.3 V
• Data Bus Width: 8|16 Bit
• Number Of Programmable I/os: 50
• Interface Type: SPI/TWI/USART
• On-chip Adc: 2(8-chx12-bit)
• On-chip Dac: 2-chx12-bit
• Number Of Timers: 7
• Processor Series: ATXMEGA256x
• Core: AVR8
• Data Ram Size: 16 KB
• Maximum Clock Frequency: 32 MHz
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• For Use With: ATSTK600-TQFP64 - STK600 SOCKET/ADAPTER 64-TQFPATAVRONEKIT - KIT AVR/AVR32 DEBUGGER/PROGRMMR770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAG770-1004 - ISP 4PORT FOR ATMEL AVR MCU SPIATAVRISP2 - PROGRAMMER AVR IN SYSTEM
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

8068T–AVR–12/10
Figure 36-4. Analog Comparator Voltage Scaler vs. Scalefac
3.
4. ADC gain stage output range is limited to 2.4 V
Problem fix/Workaround
Use external voltage input for the analog comparator if accurate voltage levels are needed
ADC has increased INL error for some operating conditions
Some ADC configurations or operating condition will result in increased INL error.
In signed mode INL is increased to:
– 6LSB for sample rates above 1Msps, and up to 8 LSB for 2Msps sample rate.
– 6LSB for reference voltage below 1.1V when VCC is above 3.0V.
– 20LSB for ambient temperature below 0 degree C and reference voltage below 1.3V.
In unsigned mode, the INL error cannot be guaranteed, and this mode should not be used.
Problem fix/Workaround
None, avoid using the ADC in the above configurations in order to prevent increased INL
error. Use the ADC in signed mode also for single ended measurements.
The amplified output of the ADC gain stage will never go above 2.4 V, hence the differential
input will only give correct output when below 2.4 V/gain. For the available gain settings, this
gives a differential input range of:
–
–
–
–
–
–
–
16x
32x
64x
3.5
2.5
1.5
0.5
1x
2x
4x
8x
3
2
1
0
0
T = 25°C
gain:
gain:
gain:
gain:
gain:
gain:
gain:
5
10
300
150
2.4
1.2
0.6
75
38
15
V
V
V
mV
mV
mV
mV
20
25
SCALEFAC
30
35
40
45
50
55
XMEGA A3
60
65
3.3 V
2.7 V
1.8 V
111