ATMEGA48-20MI Atmel, ATMEGA48-20MI Datasheet - Page 321

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ATMEGA48-20MI

Manufacturer Part Number
ATMEGA48-20MI
Description
IC AVR MCU 4K 5V 20MHZ 32-QFN
Manufacturer
Atmel
Series
AVR® ATmegar
Datasheets

Specifications of ATMEGA48-20MI

Core Processor
AVR
Core Size
8-Bit
Speed
20MHz
Connectivity
I²C, SPI, UART/USART
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
23
Program Memory Size
4KB (2K x 16)
Program Memory Type
FLASH
Eeprom Size
256 x 8
Ram Size
512 x 8
Voltage - Supply (vcc/vdd)
2.7 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
32-VQFN Exposed Pad, 32-HVQFN, 32-SQFN, 32-DHVQFN
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
Other names
ATMEGA48-24MI
ATMEGA48-24MI
29.3.0.1
29.3.0.2
29.3.0.3
2545S–AVR–07/10
Example 1
Example 2
Example 3
Table 29-2.
It is possible to calculate the typical current consumption based on the numbers from Table 2 for
other V
Calculate the expected current consumption in idle mode with USART0, TIMER1, and TWI
enabled at V
18% for the USART0, 26% for the TWI, and 11% for the TIMER1 module. Reading from Figure
3, we find that the idle current consumption is ~0,075 mA at V
current consumption in idle mode with USART0, TIMER1, and TWI enabled, gives:
Same conditions as in example 1, but in active mode instead. From Table 2, second column we
see that we need to add 3.3% for the USART0, 4.8% for the TWI, and 2.0% for the TIMER1
module. Reading from Figure 1, we find that the active current consumption is ~0,42 mA at V
= 3.0V and F = 1 MHz. The total current consumption in idle mode with USART0, TIMER1, and
TWI enabled, gives:
All I/O modules should be enabled. Calculate the expected current consumption in active mode
at V
to be ~ 4.0 mA (from Figure 2). Then, by using the numbers from Table 2 - second column, we
find the total current consumption:
I
I
I
CC
CC
CC
PRR bit
PRTIM1
PRTIM0
PRSPI
PRADC
total
total
total
CC
= 3.6V and F = 10 MHz. We find the active current consumption without the I/O modules
CC
0.075mA
0.42mA
4.0mA
and frequency settings than listed in Table 1.
CC
Additional Current Consumption (percentage) in Active and Idle mode
(
= 3.0V and F = 1 MHz. From Table 2, third column, we see that we need to add
1
(
1
(
+
1
+
Additional Current consumption
compared to Active with external
clock
(see
2.0%
1.6%
6.1%
4.9%
0.033
+
0.033
0.18
Figure 29-1
+
+
+
0.048
0.26
0.048
+
+
+
0.11
0.047
and
0.02
)
)
Figure
+
0.116mA
0.02
0.46mA
+
29-2)
0.016
+
0.061
Additional Current consumption
compared to Idle with external clock
(see
11%
8.5%
33%
26%
+
CC
ATmega48/88/168
0.049
Figure 29-7
= 3.0V and F = 1 MHz. The total
)
5.1mA
and
Figure
29-8)
321
CC

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