ATtiny20 Atmel Corporation, ATtiny20 Datasheet - Page 174

• Manufacturer Part Number: ATtiny20
• Manufacturer: Atmel Corporation

Specifications of ATtiny20

• Flash (kbytes): 2 Kbytes
• Pin Count: 14
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 5
• Hardware Qtouch Acquisition: Yes
• Max I/o Pins: 12
• Ext Interrupts: 12
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 8
• Adc Resolution (bits): 10
• Adc Speed (ksps): 15
• Analog Comparators: 1
• Resistive Touch Screen: No
• Temp. Sensor: Yes
• Crypto Engine: No
• Sram (kbytes): 0.12
• 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: 3
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20.3
20.4
20.4.1
Table 20-2.
174
Calibration
Method
Factory
Calibration
User
Calibration
Speed
Clock Characteristics
ATtiny20
Accuracy of Calibrated Internal Oscillator
Calibration Accuracy of Internal RC Oscillator
Fixed frequency within:
Target Frequency
The maximum operating frequency of the device is dependent on supply voltage, V
tionship between supply voltage and maximum operating frequency is piecewise linear, as
shown in
4.5V.
Figure 20-1. Maximum Operating Frequency vs. Supply Voltage
It is possible to manually calibrate the internal oscillator to be more accurate than default factory
calibration. Note that the oscillator frequency depends on temperature and voltage. Voltage and
temperature characteristics can be found in
page
Notes:
7.3 – 8.1 MHz
8.0 MHz
207.
12 MHz
1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
8 MHz
4 MHz
Figure
20-1, the Maximum Frequency vs. V
1.8V
Fixed voltage within:
1.8V – 5.5V
V
3V
CC
2.7V
Figure 21-53 on page 206
Fixed temp. within:
-40°C to +85°C
Temperature
25°C
CC
curve is linear between 1.8V < V
4.5V
Accuracy at given Voltage
& Temperature
and
5.5V
Figure 21-54 on
±10%
±1%
8235B–AVR–04/11
CC
. The rela-
(1)
CC
<