ATtiny40 Atmel Corporation, ATtiny40 Datasheet - Page 171

• Manufacturer Part Number: ATtiny40
• Manufacturer: Atmel Corporation

Specifications of ATtiny40

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 18
• Ext Interrupts: 18
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 12
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.25
• Self Program Memory: NO
• Dram Memory: No
• Nand Interface: No
• Picopower: No
• Temp. Range (deg C): -40 to 85
• I/o Supply Class: 1.8 to 5.5
• Operating Voltage (vcc): 1.8 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Input Capture Channels: 1
• Pwm Channels: 2
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

22. Typical Characteristics
22.1
8263A–AVR–08/10
Supply Current of I/O Modules
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
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 22-1.
I
CP
PRR bit
PRTIM0
PRTIM1
PRADC
PRSPI
PRTWI
≈
V
CC
CC
×
C
= operating voltage, C
L
×
Additional Current Consumption for different I/O modules (absolute values)
f
SW
V
CC
= 2V, f = 1MHz
190 µA
4 µA
5 µA
3 µA
5 µA
L
= load capacitance and f
V
Typical numbers
CC
= 3V, f = 4MHz
“Power Reduction Register” on page 28
260 µA
25 µA
35 µA
15 µA
35 µA
SW
= average switching frequency of
V
CC
= 5V, f = 8MHz
110 µA
150 µA
470 µA
160 µA
75 µA
171
for