Rainbow Electronics ATmega8515L - Manual (Page 204)

204
ATmega8515(L)
2512A–AVR–04/02
ATmega8515 Typical
Characteristics –
Preliminary Data
The following charts show typical behavior. These figures are not tested during manu-
facturing. 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.
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 93. RC Oscillator Frequency vs. Temperature (the devices are calibrated to
1 MHz at Vcc = 5V, T=25c)
CALIBRATED 1MHz RC OSCILLATOR FREQUENCY
F Rc
(MHz)
T
a
(˚C)
vs. TEMPERATURE
V = 2.7V
cc
V = 5.5V
cc
V = 5.0V
cc
V = 4.5V
cc
V = 4.0V
cc
V = 3.6V
cc
V = 3.3V
cc
V = 3.0V
cc
0.92
0.93
0.94
0.95
0.96
0.97
0.98
0.99
1
1.01
1.02
1.03
-40 -20 0 20 40 60 80