Atmega16/32/64/M1/C1 Typical Characteristics - Atmel ATmega32M1 Manual

27. ATmega16/32/64/M1/C1 Typical Characteristics

7647H–AVR–03/12
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 repre-
senting 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 dis-
abled during these measurements.
consumption compared to I
Reduction Register. See "Power Reduction Register" on page 37 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 tempera-
ture. The dominating factors are operating voltage and frequency.
The current drawn from capacitive loaded pins may be estimated (for one pin) as C
C = load capacitance, V
L
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 cur-
rent drawn by the Watchdog Timer.
Atmel ATmega16/32/64/M1/C1
Table 27-1 on page 332
Active and I Idle for every I/O module controlled by the Power
CC CC
= operating voltage and f = average switching frequency of I/O pin.
CC
shows the additional current
V *f where
*
L
CC
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