ATmega645P Atmel Corporation, ATmega645P Datasheet - Page 402
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ATmega645P
Manufacturer Part Number
ATmega645P
Description
Manufacturer
Atmel Corporation
Specifications of ATmega645P
Flash (kbytes)
64 Kbytes
Pin Count
64
Max. Operating Frequency
16 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
54
Ext Interrupts
17
Usb Speed
No
Usb Interface
No
Spi
2
Twi (i2c)
1
Uart
1
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)
4
Eeprom (bytes)
2048
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
Yes
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
4
Input Capture Channels
1
Pwm Channels
4
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
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29.3.3.1
8285D–AVR–06/11
Example 1
ATmega165A/PA/325A/PA/3250A/PA/645A/P/6450A/P
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
+
0.131
29-2)
Table
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
13.1%
13.0%
13.2%
12.7%
and
V
CC
Figure
= 5V, F = 8MHz
CC
= 3.0V and
29-7)
Table 29-2
402
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