ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 402

• 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

29.3.3.1
402
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/645
Example 1
are controlled by the Power Reduction Register. See
details.
Table 29-5.
Table 29-6.
It is possible to calculate the typical current consumption based on the numbers from
for other V
Calculate the expected current consumption in idle mode with USART0, TIMER1, and SPI
enabled at V
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
Figure
CC
CC
29-6, we find that the idle current consumption is ~0.09 mA at V
and frequency settings than listed in
ATmega325A: Additional Current Consumption for the different I/O modules
(absolute values)
ATmega325A: Additional Current Consumption (percentage) in Active and Idle
mode
= 3.0V and F = 1MHz. From
Additional Current consumption
compared to Active with external clock
(see
Typical numbers
7 µA
6.9 µA
6.6 µA
7 µA
V
Figure 29-1
CC
I
CC
= 2V, F = 1MHz
total
≈
0.09mA
and
3.2%
3.4%
3.3%
3.4%
Figure
•
(
1
+
Table
0.131
29-2)
44 µA
43.5 µA
47 µA
47 µA
V
CC
+
Table
29-2, second column, we see that we need to
0.13
= 3V, F = 4MHz
”Power Reduction Register” on page 41
+
29-1.
Additional Current consumption
compared to Idle with external clock
(see
0.132
Figure 29-6
)
≈
0.13mA
195 µA
210 µA
205 µA
206 µA
12.7%
13.1%
13.0%
13.2%
and
V
CC
Figure
= 5V, F = 8MHz
CC
8285B–AVR–03/11
= 3.0V and
29-7)
Table 29-2
for