ATmega645P Atmel Corporation, ATmega645P Datasheet - Page 495
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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29.6.3.1
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 29-11. 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
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