ATmega1284 Atmel Corporation, ATmega1284 Datasheet - Page 532

• Manufacturer Part Number: ATmega1284
• Manufacturer: Atmel Corporation

Specifications of ATmega1284

• Flash (kbytes): 128 Kbytes
• Pin Count: 44
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 16
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 32
• Ext Interrupts: 32
• Usb Speed: No
• Usb Interface: No
• Spi: 3
• Twi (i2c): 1
• Uart: 2
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: No
• Crypto Engine: No
• Sram (kbytes): 16
• Eeprom (bytes): 4096
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 3
• Output Compare Channels: 6
• Input Capture Channels: 1
• Pwm Channels: 6
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

29.8.3
Example
8272C–AVR–06/11
Supply Current of I/O modules
The tables and formulas below can be used to calculate the additional current consumption for
the different I/O modules in Active and Idle mode. The enabling or disabling of the I/O modules
are controlled by the Power Reduction Register. See
page 48
Table 29-15. Additional Current Consumption for the different I/O modules (absolute values)
Table 29-16. Additional Current Consumption (percentage) in Active and Idle mode
It is possible to calculate the typical current consumption based on the numbers from
12 on page 480
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 8.0% for the TIMER1, 19.8% for the ADC, and 13.2% for the SPI module. Reading from
Figure 29-301 on page 504
and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled,
gives:
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM3
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM3
PRTIM2
PRTIM1
PRTIM0
PRTADC
PRSPI
CC
= 2.0V and F = 1MHz. From
for details.
ATmega164A/PA/324A/PA/644A/PA/1284/P
for other V
Typical numbers in
Additional Current consumption
compared to Active with external
clock (see
and
V
CC
Figure 29-296 on page
, we find that the idle current consumption is ~0.075 mA at V
= 2V, F = 1MHz
CC
13.5 µA
3.0 µA
2.9 µA
7.5 µA
4.0 µA
6.0 µA
4.2 µA
1.7 µA
5.7 µA
and frequency settings than listed in
Figure 29-295 on page 501
Table 29-12 on page
0.9%
0.9%
2.3%
1.1%
1.8%
1.2%
0.5%
3.0%
2.0%
501)
V
CC
= 3V, F = 4MHz
19.2 µA
19.2 µA
49.3 µA
24.7 µA
39.7 µA
26.4 µA
11.6 µA
54.7 µA
40.6 µA
”PRR0 – Power Reduction Register 0” on
480, third column, we see that we need
Additional Current consumption
compared to Idle with external clock
(see
Figure 29-301 on page
Figure 29-300 on page 503
Table 29-11 on page
15.4%
12.1%
19.8%
13.2%
V
6.0%
6.0%
7.5%
8.0%
3.6%
CC
= 5V, F = 8MHz
230.3 µA
105.5 µA
176.3 µA
113.7 µA
212.2 µA
87.7 µA
88.5 µA
54.3 µA
273 µA
504)
Table 29-
CC
480.
= 2.0V
and
532