Datasheet

 2018 Microchip Technology Inc. Data Sheet Complete DS40002060A-page 130
ATtiny4/5/9/10
18. Typical Characteristics
The data contained in this section is largely based on simulations and characterization of similar devices in the same pro-
cess and design methods. Thus, the data should be treated as indications 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 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.
A sine wave generator with rail-to-rail output is used as clock source but current consumption in Power-Down mode is inde-
pendent of clock selection. 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.
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 f
SW
= average switching frequency of I/O pin.
18.1 Supply Current of I/O Modules
Tables and formulas below can be used to calculate additional current consumption for the different I/O modules in Active
and Idle mode. Enabling and disabling of I/O modules is controlled by the Power Reduction Register. See “Power Reduc-
tion Register” on page 34 for details.
Note: 1. The ADC is available in ATtiny5/10, only
Table 18-2 below can be used for calculating typical current consumption for other supply voltages and frequencies than
those mentioned in the Table 18-1 above.
Note: 1. The ADC is available in ATtiny5/10, only
Table 18-1. Additional Current Consumption for the different I/O modules (absolute values)
PRR bit Typical numbers
V
CC
= 2V, f = 1MHz V
CC
= 3V, f = 4MHz V
CC
= 5V, f = 8MHz
PRTIM0 6.6 uA 40.0 uA 153.0 uA
PRADC
(1)
29.6 uA 88.3 uA 333.3 uA
Table 18-2. Additional Current Consumption (percentage) in Active and Idle mode
PRR bit
Current consumption additional to
active mode with external clock
(see Figure 18-1 and Figure 18-2)
Current consumption additional to
idle mode with external clock
(see Figure 18-7 and Figure 18-8)
PRTIM0 2.3 % 10.4 %
PRADC
(1)
6.7 % 28.8 %
I
CP
V
CC
C
L
f
SW
