The tables and formulas below can be used to calculate the additional current consumption for the different I/O modules in Active and Idle mode. The enabling or disabling of the I/O modules are controlled by the Power Reduction Register. See ”Power Reduction Register” on page 43 for details.
| PRR bit | Typical numbers @ 25°C | ||
|---|---|---|---|
| VCC = 2V, F = 1MHz | VCC = 3V, F = 4MHz | VCC = 5V, F = 8MHz | |
| PRUSART0 | 4.66μA | 28.73μA | 103.38μA |
| PRTWI | 6.63μA | 41.89μA | 148.00μA |
| PRTIM2 | 6.64μA | 37.74μA | 137.36μA |
| PRTIM1 | 4.36μA | 29.65μA | 112.13μA |
| PRTIM0 | 1.61μA | 9.59μA | 32.13μA |
| PRSPI | 5.55μA | 37.15μA | 136.38μA |
| PRADC | 7.01μA | 43.31μA | 158.38μA |
| PRR bit | Additional Current consumption compared to Active with external clock (see Figure 1 and Figure 2) | Additional Current consumption compared to Idle with external clock (see Figure 1 and Figure 2) |
|---|---|---|
| PRUSART0 | 2.20% | 13.12% |
| PRTWI | 3.13% | 18.65% |
| PRTIM2 | 3.13% | 18.69% |
| PRTIM1 | 2.06% | 12.28% |
| PRTIM0 | 0.76% | 4.54% |
| PRSPI | 2.62% | 15.63% |
| PRADC | 3.31% | 19.74% |
It is possible to calculate the typical current consumption based on the numbers from the table above for other VCC and frequency settings than listed in the table Table 1.