ATtiny88 Atmel Corporation, ATtiny88 Datasheet - Page 208

• Manufacturer Part Number: ATtiny88
• Manufacturer: Atmel Corporation

Specifications of ATtiny88

• Flash (kbytes): 8 Kbytes
• Pin Count: 32
• Max. Operating Frequency: 12 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 12
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 28
• Ext Interrupts: 28
• 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): 0.5
• Eeprom (bytes): 64
• Self Program Memory: YES
• Dram Memory: No
• Nand Interface: No
• Picopower: Yes
• 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

22.3
22.4
22.4.1
Table 22-1.
208
Calibration
Method
Factory Calibration
User Calibration
Speed
Clock Characterizations
ATtiny48/88
Calibrated Internal Oscillator Accuracy
Calibration Accuracy of Internal Oscillator
Fixed frequency within:
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 22-1. Maximum Operating Frequency vs. Supply Voltage
It is possible to manually calibrate the internal oscillator to be more accurate than default factory
calibration. Please note that the oscillator frequency depends on temperature and voltage. Volt-
age and temperature characteristics can be found in
page
Notes:
Target Frequency
7.3 – 8.1 MHz
247,
8.0 MHz
12 MHz
1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
8 MHz
4 MHz
Figure
Figure 23-112
22-1, the Maximum Frequency vs. V
1.8V
Fixed voltage within:
and
1.8V – 5.5V
Figure 23-113 on page
V
3V
CC
2.7V
Fixed temperature within:
-40°C to +85°C
Temperature
Figure 23-55 on page
275.
25°C
CC
curve is linear between 1.8V < V
4.5V
Voltage & Temperature
Accuracy at given
246,
5.5V
±10%
Figure 23-56 on
±1%
8008H–AVR–04/11
CC
. The rela-
CC
(1)
<