Datasheet

ATmega32A
 2018 Microchip Technology Inc. Data Sheet Complete DS40002072A-page 296
29. Typical Characteristics
The following charts show typical behavior. These figures are not tested during manufacturing. All current con-
sumption measurements are performed with all I/O pins configured as inputs and with internal pull-ups enabled. A
square 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 capac-
itance, 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 ensured to function properly at fre-
quencies 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.
29.1 Active Supply Current
Figure 29-1. Active Supply Current vs. Low Frequency (0.1 - 1.0 MHz)
5.5 V
5.0 V
4.5 V
4.0 V
3.6 V
3.3 V
2.7 V
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Frequency (MHz)
I
CC
(mA)