ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 495

• Manufacturer Part Number: ATMEGA645A-AU
• Description: IC MCU AVR 64K FLASH 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA645A-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 54
• Program Memory Size: 64KB (32K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 2K x 8
• Ram Size: 4K 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: 64-TQFP
• Processor Series: ATmega
• Core: AVR
• Data Bus Width: 8 bit
• Data Ram Size: 4 KB
• Interface Type: SPI, USART
• Maximum Clock Frequency: 16 MHz
• Number Of Programmable I/os: 54
• Number Of Timers: 3
• Operating Supply Voltage: 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Operating Temperature Range: - 40 C to + 85 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

29.6.3.1
8285B–AVR–03/11
Example 1
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
are controlled by the Power Reduction Register. See
details.
Table 29-11. ATmega3250PA: Additional Current Consumption for the different I/O modules
Table 29-12. ATmega3250PA: Additional Current Consumption (percentage) in Active and Idle
It is possible to calculate the typical current consumption based on the numbers from
12
Calculate the expected current consumption in idle mode with USART0, TIMER1, and SPI
enabled at V
to add 13.1% for the USART0, 13.0% for the SPI, and 13.2% for the TIMER1 module. Reading
from
F = 1MHz. The total current consumption in idle mode with USART0, TIMER1, and SPI enabled,
gives:
PRR bit
PRADC
PRUSART0
PRSPI
PRTIM1
PRR bit
PRADC
PRUSART0
PRSPI
PRTIM1
for other V
Figure
29-311, we find that the idle current consumption is ~0.09 mA at V
CC
CC
(absolute values)
mode
= 3.0V and F = 1MHz. From
and frequency settings than listed in
Additional Current consumption
compared to Active with external clock
(see
Typical numbers
7 µA
6.9 µA
6.6 µA
7 µA
V
Figure 29-305
CC
I
CC
= 2V, F = 1MHz
total
≈
0.09mA
3.2%
3.4%
3.3%
3.4%
and
•
Figure
(
1
+
0.131
Table
44 µA
43.5 µA
47 µA
47 µA
29-306)
V
CC
+
29-11, second column, we see that we need
0.13
= 3V, F = 4MHz
”Power Reduction Register” on page 41
Table
+
0.132
Additional Current consumption
compared to Idle with external clock
(see
29-11.
Figure 29-310
)
≈
0.13mA
195 µA
210 µA
205 µA
206 µA
12.7%
13.1%
13.0%
13.2%
V
CC
and
= 5V, F = 8MHz
Figure
CC
= 3.0V and
Table 29-
29-311)
495
for