Datasheet

ATmega48A/PA/88A/PA/168A/PA/328/P
 2018 Microchip Technology Inc. Data Sheet Complete DS40002061A-page 326
31. Typical Characteristics – (T
A
= -40°C to 85°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 square wave generator with rail-to-rail output is used as clock source.
All Active- and Idle current consumption measurements are done with all bits in the PRR register set and thus,
the corresponding I/O modules are turned off. Also the Analog Comparator is disabled during these
measurements. The ”ATmega88PA: Supply Current of IO Modules” on page 407 and page 457 shows the
additional current consumption compared to I
CC
Active and I
CC
Idle for every I/O module controlled by the Power
Reduction Register. See ”Power Reduction Register” on page 51 for details.
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 ensured 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.