ATMega chip full datasheet - UCSD Department of Physics

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ATmega48A/PA/88A/PA/168A/PA/328/P30. Typical CharacteristicsThe 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 andwith internal pull-ups enabled. A square wave generator with rail-to-rail output is used as clocksource.All Active- and Idle current consumption measurements are done with all bits in the PRR registerset and thus, the corresponding I/O modules are turned off. Also the Analog Comparator is disabledduring these measurements. The ”ATmega88PA: Supply Current of IO Modules” on page413 and page 463 shows the additional current consumption compared to I CC Active and I CC Idlefor every I/O module controlled by the Power Reduction Register. See ”Power Reduction Register”on page 43 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, operatingfrequency, 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 whereC 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 guaranteed tofunction properly at frequencies higher than the ordering code indicates.The difference between current consumption in Power-down mode with Watchdog Timerenabled and Power-down mode with Watchdog Timer disabled represents the differential currentdrawn by the Watchdog Timer.8271D–AVR–05/11332
ATmega48A/PA/88A/PA/168A/PA/328/P30.1 ATmega48A Typical Characteristics30.1.1 Active Supply CurrentFigure 30-1.ICC (mA)10.80.60.40.2ATmega48A: Active Supply Current vs. Low Frequency (0.1-1.0MHz)5.5 V5.0 V4.5 V4.0 V3.3 V2.7 V1.8 V00 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1Frequency (MHz)Figure 30-2.12ATmega48A: Active Supply Current vs. Frequency (1-20MHz1085.5 V5.0 V4.5 VICC (mA)643.3 V4.0 V22.7 V1.8 V00 2 4 6 8 10 12 14 16 18 20Frequency (MHz)8271D–AVR–05/11333
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Atmel Corporation2325 Orchard Parkw
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ATMega chip full datasheet - UCSD Department of Physics

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