ATmega1281R231 Atmel Corporation, ATmega1281R231 Datasheet - Page 385

• Manufacturer Part Number: ATmega1281R231
• Manufacturer: Atmel Corporation

Specifications of ATmega1281R231

• Flash (kbytes): 128 Kbytes
• Max. Operating Frequency: 16 MHz
• Max I/o Pins: 54
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Crypto Engine: AES
• Sram (kbytes): 8
• Eeprom (bytes): 4096
• Operating Voltage (vcc): 1.8 to 3.6
• Timers: 6
• Frequency Band: 2.4 GHz
• Max Data Rate (mb/s): 2
• Antenna Diversity: Yes
• External Pa Control: Yes
• Power Output (dbm): 3
• Receiver Sensitivity (dbm): -101
• Receive Current Consumption (ma): 13.2
• Transmit Current Consumption (ma): 14.4
• Link Budget (dbm): 104

32. Typical Characteristics
32.1
2549N–AVR–05/11
Active Supply Current
The following charts show typical behavior. These figures are not tested during manufacturing.
All current consumption measurements are performed with all I/O pins configured as inputs and
with internal pull-ups enabled. A sine wave generator with rail-to-rail output is used as clock
source.
All Active- and Idle current consumption measurements are done with all bits in the PRR regis-
ters set and thus, the corresponding I/O modules are turned off. Also the Analog Comparator is
disabled during these measurements.
show the additional current consumption compared to I
ule controlled by the Power Reduction Register. See
details.
The power consumption in Power-down mode is independent of clock selection.
The current consumption is a function of several factors such as: operating voltage, operating
frequency, loading of I/O pins, switching rate of I/O pins, code executed and ambient tempera-
ture. The dominating factors are operating voltage and frequency.
The current drawn from capacitive loaded pins may be estimated (for one pin) as C
where C
pin.
The parts are characterized at frequencies higher than test limits. Parts are not guaranteed to
function properly at frequencies higher than the ordering code indicates.
The difference between current consumption in Power-down mode with Watchdog Timer
enabled and Power-down mode with Watchdog Timer disabled represents the differential cur-
rent drawn by the Watchdog Timer.
Figure 32-1. Active Supply Current vs. frequency (0.1MHz - 1.0MHz)
2.5
1.5
0.5
L
2
1
0
= load capacitance, V
0
0.1
0.2
0.3
CC
ATmega640/1280/1281/2560/2561
= operating voltage and f = average switching frequency of I/O
0.4
Frequency (MHz)
Table 32-1 on page 390
0.5
0.6
“Power Reduction Register” on page 54
CC
0.7
Active and I
0.8
and
0.9
CC
Table 32-2 on page 391
Idle for every I/O mod-
1
5.5V
5.0V
4.5V
4.0V
3.3V
2.7V
1.8V
L
×
V
CC
385
× f
for