23.5Calibrated RC Oscillator Accuracy
Table 23-3. Calibration Accuracy of Internal RC Oscillator
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Frequency |
Vcc |
Temperature |
Calibration |
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Accuracy |
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Factory |
8.0 MHz |
3V |
25°C |
±1% |
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Calibration |
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User Calibration |
7.3 - 8.1 MHz |
2.7V - 5.5V |
-40°C - +125°C |
±14% |
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24. Typical Characteristics
The data contained in this section is extracted from actual silicon characterization and should be treated as indications of how the part will behave.
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 railtorail output is used as clock source.
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*VCC*f 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.
160 ATtiny25/45/85 Auto 
7598C–AVR–09/06
ATtiny25/45/85 Auto
24.1Active Supply Current
Figure 24-1. Active Supply Current vs. Frequency (0.1 - 1.0 MHz)
ACTIVE S UP P LY CURRENT vs . LOW FREQUENCY
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0.1 - 1.0 MHz |
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0.040 |
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5.5 V |
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0.035 |
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5.0 V |
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0.030 |
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4.5 V |
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0.025 |
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4.0 V |
(mA) |
0.020 |
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3.3 V |
CC |
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2.7 V |
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I |
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0.015 |
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0.010 |
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1.8 V |
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0.005 |
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0.000 |
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0 |
0.1 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1 |
Frequency (MHz)
Figure 24-2. Active Supply Current vs. Frequency (1 - 20 MHz)
ACTIVE S UP P LY CURRENT vs . FREQUENCY
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1 - 20MHz |
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14 |
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5.5 V |
12 |
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5.0 V |
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10 |
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4.5 V |
8 |
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CC(mA) |
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4.0 V |
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I |
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6 |
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4 |
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3.3 V |
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2.7 V |
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2 |
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0 |
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1.8 V |
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0 |
2 |
4 |
6 |
8 |
10 |
12 |
14 |
16 |
18 |
20 |
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Frequency (MHz) |
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161
7598C–AVR–09/06
Figure 24-3. Active Supply Current vs. VCC (Internal RC Oscillator, 128 kHz)
ACTIVE SUPPLY CURRENT vs . VCC
INTERNAL RC OSCILLATOR, 128 KHz
0.25 |
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125 ˚C |
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85 ˚C |
0.2 |
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25 ˚C |
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-40 ˚C |
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0.15 |
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(mA) |
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CC |
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I |
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0.1 |
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0.05 |
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0 |
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1.5 |
2 |
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
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VCC (V) |
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Figure 24-4. Active Supply Current vs. VCC (Internal RC Oscillator, 1 MHz)
ACTIVE SUPPLY CURRENT vs . VCC
INTERNAL RC OSCILLATOR, 1 MHz
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1.8 |
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1.6 |
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1.4 |
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125 ˚C |
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85 ˚C |
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1.2 |
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25 ˚C |
(mA) |
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-40 ˚C |
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1 |
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CC |
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I |
0.8 |
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0.6 |
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0.4 |
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0.2 |
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0 |
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1.5 |
2 |
2.5 |
3 |
3.5 |
4 |
4.5 |
5 |
5.5 |
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VCC (V) |
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162 ATtiny25/45/85 Auto 
7598C–AVR–09/06