ATmega48 Atmel Corporation, ATmega48 Datasheet - Page 321

• Manufacturer Part Number: ATmega48
• Manufacturer: Atmel Corporation

Specifications of ATmega48

• Flash (kbytes): 4 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 20 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• 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: No
• Crypto Engine: No
• Sram (kbytes): 0.5
• Eeprom (bytes): 256
• Self Program Memory: NO
• 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
2545T–AVR–05/11
Supply current of I/O modules
Figure 30-12. Idle supply current vs. V
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 30-1.
Table 30-2.
PRR bit
PRUSART0
PRTWI
PRTIM2
PRTIM1
PRTIM0
PRSPI
PRADC
PRR bit
PRUSART0
PRTWI
PRTIM2
30
25
20
15
10
5
0
1.5
Additional current consumption for the different I/O modules (absolute values).
Additional current consumption (percentage) in active and idle mode.
Additional current consumption
compared to active with external clock
(see
Figure 30-2 on page
4.8%
3.3%
4.7%
2
Figure 30-1 on page 315
V
CC
= 2V, F = 1MHz
2.5
8.0µA
5.0µA
4.0µA
12µA
11µA
15µA
12µA
3
316)
CC
V
(32kHz external oscillator).
CC
3.5
and
(V)
V
Typical numbers
CC
4
= 3V, F = 4MHz
“Power reduction register” on page 41
51µA
75µA
72µA
32µA
24µA
95µA
75µA
Additional current consumption
compared to Idle with external clock
(see
Figure 30-8 on page
18%
26%
25%
4.5
Figure 30-7 on page 318
ATmega48/88/168
5
V
CC
5.5
319)
25°C
= 5V, F = 8MHz
220µA
315µA
300µA
130µA
100µA
400µA
315µA
and
321
for