Rainbow-electronics AT90LS4433 Manual do Utilizador descarregar pdf (Página 101)

101

AT90S/LS4433

1042G–AVR–09/02

Typical

Characteristics

The following charts show typical behavior. These figures are not tested during manu-

facturing. 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

• V

• f, where C

= load capacitance, V

= operating voltage and f = average

switching frequency of I/O pin.

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

teed 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 dif-

ferential current drawn by the Watchdog Timer.

The difference between Power-down mode with Brown-out Detector enabled and

Power-down mode with Watchdog Timer disabled represents the differential current

drawn by the Brown-out Detector.

Figure 70. Active Supply Current vs. Frequency

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

ACTIVE SUPPLY CURRENT vs. FREQUENCY

= 25˚C

= 6V

= 5.5V

= 5V

= 4.5V

= 4V

= 3.6V

= 3.3V

= 3.0V

= 2.7V

Frequency (MHz)

(mA)

1 2 ... 96 97 98 99 100 101 102 103 104 105 106 ... 124 125

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Rainbow-electronics AT90LS4433 Manual do Utilizador Página 101