Rainbow-electronics ATmega8515L Manual do Utilizador descarregar pdf (Página 204)

204

ATmega8515(L)

2512A–AVR–04/02

ATmega8515 Typical

Characteristics –

Preliminary Data

The following chartsshow typicalbehavior.These figures are not testedduring manu-

facturing. All current consumption measurements are performedwith all I/Opins

configured as inputs andwith internalpull-ups enabled.Asine wave generatorwithrail-

to-rail output is used asclock source.

The powerconsumption in Power-downmodeis independent ofclock selection.

The current consumption is a function ofseveralfactors such as: Operating voltage,

operating frequency, loading ofI/Opins, switching rate ofI/Opins, codeexecuted and

ambient temperature. The dominating factors areoperating voltage andfrequency.

The current drawn from capacitive loadedpins maybeestimated(for one pin) as

*f where C

=loadcapacitance, V

= operating voltage andf=average switch-

ing frequency ofI/Opin.

The parts are characterized at frequencieshigher than test limits.Parts are not guaran-

teed to function properly at frequencieshigher than theordering codeindicates.

The difference between current consumption in Power-downmode withWatchdog

Timer enabled and Power-downmode withWatchdog Timerdisabledrepresents the dif-

ferentialcurrent drawn by the Watchdog Timer.

Figure 93. RCOscillatorFrequency vs.Temperature (the devices are calibrated to

1 MHz at Vcc = 5V, T=25c)

CALIBRATED 1MHz RC OSCILLATOR FREQUENCY

(MHz)

(˚C)

vs. TEMPERATURE

V = 2.7V

V = 5.5V

V = 5.0V

V = 4.5V

V = 4.0V

V = 3.6V

V = 3.3V

V = 3.0V

0.92

0.93

0.94

0.95

0.96

0.97

0.98

0.99

1.01

1.02

1.03

-40 -20 0 20 40 60 80

1 2 ... 199 200 201 202 203 204 205 206 207 208 209 ... 222 223

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