ATMEGA324PA-AUR Atmel, ATMEGA324PA-AUR Datasheet - Page 347

• Manufacturer Part Number: ATMEGA324PA-AUR
• Description: MCU AVR 32KB FLASH 20 MHZ 44TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA324PA-AUR

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K x 8
• Voltage - Supply (vcc/vdd): 1.8 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

28.1.3
Example
8152G–AVR–11/09
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 49
Table 28-1.
Table 28-2.
It is possible to calculate the typical current consumption based on the numbers from
on page 347
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
to add 8.8% for the TIMER1, 20.9% for the ADC, and 13.8% for the SPI module. Reading from
Figure 28-6 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
Additional Current Consumption for the different I/O modules (absolute values)
Additional Current Consumption (percentage) in Active and Idle mode
Typical numbers
Additional Current consumption
compared to Active with external
clock (see
342
V
CC
344, we find that the idle current consumption is ~0.073 mA at V
I
CC
and
= 2V, F = 1 MHz
CC
total
11.7 µA
3.1 µA
2.9 µA
6.1 µA
5.9 µA
3.7 µA
1.4 µA
5.1 µA
Figure 28-2 on page
and frequency settings than listed in
ATmega164PA/324PA/644PA/1284P
≈
Figure 28-1 on page
0.073 mA (1+ 0.088 + 0.209 + 0.138)
1.5
1.5
3.2
2.9
1.8
0.7
4.4
2.9
%
%
%
%
%
%
%
%
Table 28-2 on page
⋅
V
CC
342)
= 3V, F = 4 MHz
20.9 µA
21.6 µA
40.1 µA
26.1 µA
55.5 µA
37.9 µA
9.4 µA
44 µA
Additional Current consumption
compared to Idle with external
clock (see
344
”PRR – Power Reduction Register” on
347, third column, we see that we need
and
Figure 28-7 on page
Table 28-1 on page
≈
Figure 28-6 on page
0.105 mA
V
15.4
14.0
20.9
13.8
7.4
7.5
8.8
3.1
CC
%
%
%
%
= 5V, F = 8 MHz
%
%
%
%
205.8 µA
113.2 µA
249.5 µA
195.5 µA
96.7 µA
38.8 µA
101 µA
182 µA
345)
347.
Table 28-2
CC
= 2.0V
347