ATtiny44 datasheet(185/236 Pages) ATMEL

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185

8006H–AVR–10/09

ATtiny24/44/84

21. Typical Characteristics

The data contained in this section is largely based on simulations and characterization of similar

devices in the same process and design methods. Thus, the data should be treated as indica-

tions of how the part will behave.

The following charts show typical behavior. These figures are not tested during manufacturing.

During characterisation devices are operated at frequencies higher than test limits but they are

not guaranteed to function properly at frequencies higher than the ordering code indicates.

All current consumption measurements are performed with all I/O pins configured as inputs and

with internal pull-ups enabled. Current consumption is a function of several factors such as oper-

ating 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.

A sine wave generator with rail-to-rail output is used as clock source but current consumption in

Power-Down mode is independent of clock selection. The difference between current consump-

tion 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.

The current drawn from pins with a capacitive load may be estimated (for one pin) as follows:

where V

CC = operating voltage, C

L = load capacitance and fSW = average switching frequency of

I/O pin.

21.1

Supply Current of I/O 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

is controlled by the Power Reduction Register. See “Power Reduction Register” on page 35 for

details.

Table 21-2 below can be used for calculating typical current consumption for other supply volt-

ages and frequencies than those mentioned in the Table 21-1 above.

≈

Table 21-1.

Additional Current Consumption for the different I/O modules (absolute values)

PRR bit

Typical numbers

VCC = 2V, f = 1MHz

VCC = 3V, f = 4MHz

VCC = 5V, f = 8MHz

PRTIM1

5.1 uA

31.0 uA

118.2 uA

PRTIM0

6.6 uA

40.0 uA

153.0 uA

PRUSI

3.7 uA

23.1 uA

92.2 uA

PRADC

29.6 uA

88.3 uA

333.3 uA

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