ATMEGA640 datasheet(373/436 Pages) MICROCHIP

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ATmega640/V-1280/V-1281/V-2560/V-2561/V [DATASHEET]

DS40002211A

32. 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

sine 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 registers set and thus, the

corresponding I/O modules are turned off. Also the Analog Comparator is disabled during these measurements.

Table 32-1 on page 378 and Table 32-2 on page 379 show the additional current consumption compared to ICC

Active and ICC Idle for every I/O module controlled by the Power Reduction Register. See “Power Reduction Regis-

ter” on page 52 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 CL × VCC × f where CL = 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 guaranteed 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.

32.1 Active Supply Current

Figure 32-1. Active Supply Current vs. frequency (0.1MHz - 1.0MHz)

5.5V

5.0V

4.5V

4.0V

3.3V

2.7V

1.8V

0.5

1.5

2.5

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Frequency (MHz)

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