ATMEGA88-20MUR Atmel, ATMEGA88-20MUR Datasheet - Page 322

• Manufacturer Part Number: ATMEGA88-20MUR
• Description: MCU AVR 8K FLASH 20MHZ 32QFN
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA88-20MUR

• 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: 8KB (4K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 1K 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: *
• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Interface Type: SPI/TWI/USART
• Total Internal Ram Size: 1KB
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 2.7V
• On-chip Adc: 8-chx10-bit
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 32
• Package Type: MLF EP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

30.3.0.1
30.3.0.2
30.3.0.3
2545T–AVR–05/11
Example 1
Example 2
Example 3
Table 30-2.
It is possible to calculate the typical current consumption based on the numbers from
on page 321
Calculate the expected current consumption in idle mode with USART0, TIMER1, and TWI
enabled at V
we need to add 18% for the USART0, 26% for the TWI, and 11% for the TIMER1 module. Read-
ing from
= 3.0V and F = 1MHz. The total current consumption in idle mode with USART0, TIMER1, and
TWI enabled, gives:
Same conditions as in example 1, but in active mode instead. From
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
consumption is ~0.42mA at V
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 ~ 4.0mA (from
page 321
I
I
I
CC
CC
CC
PRR bit
PRTIM1
PRTIM0
PRSPI
PRADC
total
total
total
CC
≈
≈
≈
= 3.6V and F = 10MHz. We find the active current consumption without the I/O modules
0.075mA
0.42mA
4.0mA
Figure 30-7 on page
- second column, we find the total current consumption:
CC
for other V
•
Additional current consumption (percentage) in active and idle mode. (Continued)
•
(
Additional current consumption
compared to active with external clock
(see
Figure 30-2 on page
4.9%
= 3.0V and F = 1MHz. From
2.0%
1.6%
6.1%
•
1
(
1
(
+
1
+
0.033
+
Figure 30-1 on page 315
0.033
Figure 30-2 on page
0.18
CC
+
+
+
and frequency settings than listed in
0.048
0.26
0.048
318, we find that the idle current consumption is ~0.075mA at V
CC
+
+
+
= 3.0V and F = 1MHz. The total current consumption in idle
0.11
0.047
0.02
316)
)
Figure 30-1 on page
)
≈
+
≈
0.116mA
0.02
316). Then, by using the numbers from
0.46mA
and
Table 30-2 on page
+
0.016
+
0.061
Additional current consumption
compared to Idle with external clock
(see
Figure 30-8 on page
11%
8.5%
33%
26%
+
315, we find that the active current
Figure 30-7 on page 318
ATmega48/88/168
0.049
Table 30-1 on page
321, third column, we see that
)
≈
5.1mA
Table 30-2 on page
319)
Table 30-2 on
321.
and
Table 30-2
321,
322
CC