ATmega1284 Atmel Corporation, ATmega1284 Datasheet - Page 402
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ATmega1284
Manufacturer Part Number
ATmega1284
Description
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
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29.3.3
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 29-5.
Table 29-6.
It is possible to calculate the typical current consumption based on the numbers from
on page 428
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 6.0% for the TIMER1, 14.8% for the ADC, and 10.3% for the SPI module. Reading from
Figure 29-153 on page
and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled,
gives:
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
PRR bit
PRUSART1
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRADC
PRSPI
CC
= 2.0V and F = 1MHz. From
for details.
for other V
ATmega164A/PA/324A/PA/644A/PA/1284/P
Additional Current Consumption for the different I/O modules (absolute values)
Additional Current Consumption (percentage) in Active and Idle mode
Typical numbers in
Additional Current consumption
compared to Active with external
clock (see
423
423)
V
CC
I
and
CC
425, we find that the idle current consumption is ~0.078mA at V
= 2V, F = 1MHz
CC
total
11.8µA
3.1µA
3.0µA
6.4µA
5.6µA
3.6µA
1.7µA
5.3µA
Figure 29-149 on page
and frequency settings than listed in
≈
Figure 29-148 on page
0.078mA (1+ 0.060 + 0.148 + 0.103)
1.4%
1.4%
3.0%
2.5%
1.6%
0.7%
4.2%
2.7%
Table 29-8 on page
⋅
V
CC
= 3V, F = 4MHz
21.5µA
21.0µA
45.7µA
37.7µA
24.8µA
10.4µA
59.2µA
40.1µA
Additional Current consumption
compared to Idle with external
clock (see
425
426)
”PRR0 – Power Reduction Register 0” on
428, third column, we see that we need
and
Figure 29-154 on page
Table 29-7 on page
≈
Figure 29-153 on page
0.102mA
V
11.3%
14.8%
10.3%
5.3%
5.2%
9.1%
6.0%
2.5%
CC
= 5V, F = 8MHz
100.0µA
214.5µA
165.8µA
107.0µA
257.0µA
206.8µA
98.2µA
43.2µA
428.
Table 29-8
CC
= 2.0V
402
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