ATmega324P datasheet(338/377 Pages) ATMEL

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338

7674F–AVR–09/09

ATmega164P/324P/644P

27. ATmega644P Typical Characteristics

• 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*VCC*f

where C

L = load capacitance, VCC = 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.

Figure 27-1. Active Supply Current vs. Frequency (0.1 - 1.0 MHz)

ACTIVE S UP P LY CURRENT vs . LOW FREQUENCY

Te mperature = 125˚C

5.5 V

5.0 V

4.5 V

3.3 V

3.0 V

2.7 V

0.2

0.4

0.6

0.8

1.2

1.4

1.6

1.8

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Fre que nc y (MHz )

ATmega324P Datasheet(PDF) 338 Page - ATMEL Corporation

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