ATMega chip full datasheet - UCSD Department of Physics

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ATmega48A/PA/88A/PA/168A/PA/328/PFigure 30-339.ATmega328P: Idle Supply Current vs. Vcc (Internal RC Oscillator, 8MHz)2ICC (mA)1.61.20.885 °C25 °C-40 °C0.401.5 2 2.5 3 3.5 4 4.5 5 5.5V CC (V)30.8.3 ATmega328P Supply Current <strong>of</strong> IO ModulesThe tables and formulas below can be used to calculate the additional current consumption forthe different I/O modules in Active and Idle mode. The enabling or disabling <strong>of</strong> the I/O modulesare controlled by the Power Reduction Register. See ”Power Reduction Register” on page 43 fordetails.Table 30-15.PRR bitATmega328P: Additional Current Consumption for the different I/O modules(absolute values)Typical numbersV CC = 2V, F = 1MHz V CC = 3V, F = 4MHz V CC = 5V, F = 8MHzPRUSART0 3.20 µA 22.17 µA 100.25 µAPRTWI 7.34 µA 46.55 µA 199.25 µAPRTIM2 7.34 µA 50.79 µA 224.25 µAPRTIM1 6.19 µA 41.25 µA 176.25 µAPRTIM0 1.89 µA 14.28 µA 61.13 µAPRSPI 6.94 µA 43.84 µA 186.50 µAPRADC 8.66 µA 61.80 µA 295.38 µA8271D–AVR–05/11512
ATmega48A/PA/88A/PA/168A/PA/328/PTable 30-16.PRR bitATmega328P: Additional Current Consumption (percentage) in Active and IdlemodeAdditional Current consumptioncompared to Active with externalclock (see Figure 30-330 on page507 and Figure 30-331 on page508)Additional Current consumptioncompared to Idle with externalclock (see Figure 30-335 on page510 and Figure 30-336 on page510)PRUSART0 1.4% 7.8%PRTWI 3.0% 16.6%PRTIM2 3.3% 17.8%PRTIM1 2.7% 14.5%PRTIM0 0.9% 4.8%PRSPI 2.9% 15.7%PRADC 4.1% 22.1%It is possible to calculate the typical current consumption based on the numbers from Table 30-15 for other V CC and frequency settings than listed in Table 30-16.30.8.3.1 ExampleCalculate the expected current consumption in idle mode with TIMER1, ADC, and SPI enabledat V CC = 2.0V and F = 1MHz. From Table 30-16, third column, we see that we need to add14.5% for the TIMER1, 22.1% for the ADC, and 15.7% for the SPI module. Reading from Figure30-336 on page 510, we find that the idle current consumption is ~0.055 mA at V CC = 2.0V and F= 1MHz. The total current consumption in idle mode with TIMER1, ADC, and SPI enabled, gives:ICCtotal ≈0.045 mA ⋅ (1 + 0.145 + 0.221 + 0.157) ≈ 0.069 mA8271D–AVR–05/11513
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Atmel Corporation2325 Orchard Parkw
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ATMega chip full datasheet - UCSD Department of Physics

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