ata5773 ATMEL Corporation, ata5773 Datasheet - Page 238

• Manufacturer Part Number: ata5773
• Description: Microcontroller With Uhf Ask/fsk Transmitter
• Manufacturer: ATMEL Corporation

21. Typical Characteristics
21.1
186
Supply Current of I/O Modules
ATtiny24/44/84
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
I/O pin.
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
details.
Table 21-1.
Table 21-2
ages and frequencies than those mentioned in the
Table 21-2.
I
CP
PRR bit
PRTIM1
PRTIM0
PRUSI
PRADC
PRR bit
PRTIM1
≈
V
CC
CC
×
= operating voltage, C
C
below can be used for calculating typical current consumption for other supply volt-
L
×
Additional Current Consumption for the different I/O modules (absolute values)
Additional Current Consumption (percentage) in Active and Idle mode
f
SW
Typical numbers
5.1 uA
29.6 uA
Current consumption additional to
active mode with external clock
(see
1.8 %
6.6 uA
3.7 uA
V
CC
Figure 21-1
= 2V, F = 1MHz
L
= load capacitance and f
and
Figure
31.0 uA
40.0 uA
23.1 uA
88.3 uA
21-2)
V
CC
Table 21-1
= 3V, F = 4MHz
“Power Reduction Register” on page 34
Current consumption additional to
idle mode with external clock
(see
8.0 %
SW
above.
= average switching frequency of
Figure 21-6
118.2 uA
153.0 uA
92.2 uA
333.3 uA
V
and
CC
= 5V, F = 8MHz
Figure
8006G–AVR–01/08
21-7)
for