ATtiny13A datasheet(124/174 Pages) ATMEL

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8126D–AVR–11/09

ATtiny13A

19. 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.

19.1 Supply Current of I/O Modules

Using Table 19-1, the typical characteristics of this section and the equation given one can cal-

culate the additional current consumption for peripheral modules in active and idle mode.

Peripheral modules are enabled and disabled via control bits in the Power Reduction Register.

See “Power Reduction Register” on page 31 for details.

19.1.1

Example

Estimate current consumption in idle mode, with Timer/Counter0 and ADC enabled, the device

running at 2V and with 1MHz external clock.

From Figure 19-7 on page 128 we find idle supply current ICC = 0.03mA. Using Figure 19-55 on

page 152 we find ADC supply current IADC = 0.18mA, and using Table 19-1 we find

Timer/Counter0 supply current ITC0 = 0.004mA. The total current consumption in idle mode is

therefore ICCTOT = 0.214mA, approximately 0.21mA.

ICP VCC CL f

≈

Table 19-1.

Additional Current Consumption (Absolute) for Peripherals

PRR bit

Typical numbers

VCC = 2V, f = 1MHz

VCC = 3V, f = 4MHz

VCC = 5V, f = 8MHz

PRTIM0

4 µA

25 µA

115 µA

PRADC

180 µA

260 µA

460 µA

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