ATmega168A Atmel Corporation, ATmega168A Datasheet - Page 388

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ATmega168A

Manufacturer Part Number
ATmega168A
Description
Manufacturer
Atmel Corporation
Datasheets

Specifications of ATmega168A

Flash (kbytes)
16 Kbytes
Pin Count
32
Max. Operating Frequency
20 MHz
Cpu
8-bit AVR
# Of Touch Channels
16
Hardware Qtouch Acquisition
No
Max I/o Pins
23
Ext Interrupts
24
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
Yes
Crypto Engine
No
Sram (kbytes)
1
Eeprom (bytes)
512
Self Program Memory
YES
Dram Memory
No
Nand Interface
No
Picopower
No
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
6
Input Capture Channels
1
Pwm Channels
6
32khz Rtc
Yes
Calibrated Rc Oscillator
Yes
30.3.3
ATmega88A: Supply Current of IO 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
details.
Table 30-5.
PRR bit
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRSPI
PRADC
Table 30-6.
PRR bit
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRSPI
PRADC
It is possible to calculate the typical current consumption based on the numbers from
on page 413
30.3.3.1
Example
Calculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabled
at V
CC
to add 13.6% for the TIMER1, 26.3% for the ADC, and 21.5% for the SPI module. Reading from
Figure 30-147 on page
2.0V and F = 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI
enabled, gives:
I
CC
total
8271D–AVR–05/11
ATmega48A/PA/88A/PA/168A/PA/328/P
ATmega88PA: Additional Current Consumption for the different I/O modules
(absolute values)
Typical numbers
V
= 2V, F = 1MHz
CC
3.0uA
6.1uA
5.2uA
3.8uA
1.5uA
5.2uA
6.3uA
ATmega88PA: Additional Current Consumption (percentage) in Active and Idle
mode
Additional Current consumption
compared to Active with external
clock (see
Figure 30-142 on page
407
and
Figure 30-143 on page
408)
1.8%
3.9%
2.9%
2.1%
0.8%
3.5%
4.2%
for other V
and frequency settings than listed in
CC
= 2.0V and F = 1MHz. From
Table 30-8 on page
410, we find that the idle current consumption is ~0.027 mA at V
0.027 mA (1 + 0.136 + 0.263 + 0.215)
”Power Reduction Register” on page 43
V
= 3V, F = 4MHz
V
= 5V, F = 8MHz
CC
CC
21.3uA
97.9uA
45.4uA
219.0uA
35.2uA
149.5uA
25.6uA
110.0uA
9.8uA
39.6uA
40.0uA
199.6uA
48.7uA
247.0uA
Additional Current consumption
compared to Idle with external
clock (see
Figure 30-147 on page
410
and
Figure 30-148 on page
410)
11.4%
24.4%
18.6%
13.6%
5.2%
21.5%
26.3%
Table 30-7 on page
413, third column, we see that we need
0.043 mA
for
Table 30-8
413.
=
CC
388

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