Rainbow Electronics ATtiny12 - Manual (Page 70)

70
ATtiny11/12
1006C–09/01
ATtiny12 Typical
Characteristics The following charts show typical behavior. These data are characterized, but not
tested. All current consumption measurements are performed with all I/O pins config-
ured as inputs and with internal pull-ups enabled. A sine wave generator with rail-to-rail
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
C
L
* V
CC
*f where C
L
= load capacitance, V
CC
= operating voltage and f = average switch-
ing frequency of I/O pin.
The parts are characterized at frequencies higher than test limits. Parts are not guaran-
teed 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 dif-
ferential current drawn by the Watchdog timer.
Figure 57. Active Supply Current vs. V
CC
, Device Clocked by Internal Oscillator
V
cc
(V)
I cc
(m
Α)
ACTIVE SUPPLY CURRENT vs. V
cc
DEVICE CLOCKED BY 1.2MHz INTERNAL RC OSCILLATOR
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
T = 85 ˚ C
A
T = 25 ˚ C
A