35.2.3 ATmega168PB Supply Current of IO Modules
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 | ||
|---|---|---|---|
| VCC = 2V, F = 1MHz | VCC = 3V, F = 4MHz | VCC = 5V, F = 8MHz | |
| PRUSART0 | 4.56μA | 27.0μA | 119.75μA |
| PRTWI | 7.81μA | 47.38μA | 177.75μA |
| PRTIM2 | 6.09μA | 35.00μA | 140.75μA |
| PRTIM1 | 5.36μA | 35.89μA | 134.36μA |
| PRTIM0 | 1.00μA | 11.41μA | 39.88μA |
| PRSPI | 4.79μA | 30.5μA | 118.13μA |
| PRADC | 4.89μA | 32.36μA | 128.63μA |
| PRR bit | Additional Current consumption compared to Active with external clock (see Figure 35-49 and Figure 35-50) | Additional Current consumption compared to Idle with external clock (see Figure 35-54and Figure 35-55) |
|---|---|---|
| PRUSART0 | 2.03% | 7.58% |
| PRTWI | 3.47% | 12.99% |
| PRTIM2 | 2.70% | 10.12% |
| PRTIM1 | 2.38% | 8.91% |
| PRTIM0 | 0.44% | 1.66% |
| PRSPI | 2.13% | 7.96% |
| PRADC | 2.17% | 8.12% |
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 Table 35-3.