Datasheet

34. Typical Characteristics (T
A
= -40°C to 105°C)
The following charts show typical behavior. These figures are not tested during manufacturing. All current
consumption measurements are performed with all I/O pins configured as inputs and with internal pull-
ups enabled. A sine wave generator with rail-to-rail output is used as clock source.
The power consumption in Power-Down mode is independent of clock selection.
The current consumption is a function of several factors such as: operating voltage, operating frequency,
loading of I/O pins, switching rate of I/O pins, code executed and ambient temperature. The dominating
factors are operating voltage and frequency.
The current drawn from capacitive loaded pins may be estimated (for one pin) as C
L
*V
CC
*f where C
L
=
load capacitance, V
CC
= operating voltage and f = average switching frequency of I/O pin.
The parts are characterized at frequencies higher than test limits. Parts are not recommended to function
properly at frequencies higher than the ordering code indicates.
The difference between current consumption in Power-Down mode with watchdog timer enabled and
Power-Down mode with watchdog timer disabled represents the differential current drawn by the
watchdog timer.
34.1 ATmega48PA Typical Characteristics
34.1.1 Active Supply Current
Figure 34-1. ATmega48PA: Active Supply Current vs. Low Frequency (0.1 MHz - 1.0 MHz)
5.5V
5.0V
4.5V
4.0V
3.6V
3.3V
2.7V
1.
8V
0
0.1
0.2
0.
3
0.4
0.5
0.6
0.7
0.
8
0.9
1
0.1 0.2 0.
3 0.4 0.5 0.6 0.7 0.8 0.9 1
Frequency (MHz)
I
CC
(mA)
ATmega48PA/88PA/168PA
Typical Characteristics (TA = -40°C to 105°C)
© 2018 Microchip Technology Inc.
Datasheet Complete
DS40002011A-page 398