27. ATmega16/32/64/M1/C1 Typical Characteristics
All DC characteristics contained in this datasheet are based on simulations and characterization of similar devices in the
same process and design methods. These values are preliminary representing design targets, and will be updated after
characterization of actual automotive silicon data.
The 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 and with internal pull-ups enabled. A sine wave generator
with rail-to-rail output is used as clock source.
All active- and idle current consumption measurements are done with all bits in the PRR register set and thus, the
corresponding I/O modules are turned off. Also the analog comparator is disabled during these measurements. Table 27-1
on page 287 shows the additional current consumption compared to ICC active and ICC idle for every I/O module controlled by
the power reduction register. See Section 6.6 “Power Reduction Register” on page 36 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, 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 CL VCCf where CL = load capacitance,
VCC = 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 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 differential current drawn by the watchdog timer.
27.1 Active Supply Current
Figure 27-1. Active Supply Current versus Frequency (0.1 to 1.0MHz)
Figure 27-2. Active Supply Current versus Frequency (1 to 24MHz)
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ATmega16/32/64/M1/C1 [DATASHEET]
7647O–AVR–01/15
MICROCHIP [ MICROCHIP ]
