ATtiny87 Atmel Corporation, ATtiny87 Datasheet - Page 245

• Manufacturer Part Number: ATtiny87
• Manufacturer: Atmel Corporation

Specifications of ATtiny87

• Flash (kbytes): 8 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 16 MHz
• Cpu: 8-bit AVR
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 2
• Twi (i2c): 1
• Uart: 1
• Lin: 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 11
• 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): 512
• Self Program Memory: YES
• 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: 3
• Input Capture Channels: 1
• Pwm Channels: 9
• 32khz Rtc: Yes
• Calibrated Rc Oscillator: Yes

22.3
22.4
22.4.1
Table 22-1.
Notes:
22.4.2
8265B–AVR–09/10
Calibration
Method
Factory
Calibration
User
Calibration
Speed
Clock Characteristics
1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
Accuracy of Calibrated Internal Oscillator
External Clock Drive Waveforms
Calibration Accuracy of Internal Oscillator
Target Frequency
Figure 22-1. Maximum Frequency vs. V
It is possible to manually calibrate the internal oscillator to be more accurate than default fac-
tory calibration. Note that the oscillator frequency depends on temperature and voltage.
Voltage and temperature characteristics can be found in
Figure 22-2. External Clock Drive Waveforms
Fixed frequency
7.3 - 8.1 MHz
8.0 MHz
within:
16 MHz
8 MHz
4 MHz
V
IL1
V
1.8V
IH1
Fixed voltage within:
1.8 - 5.5V
V
3V
CC
2.7V
CC
, ATtiny87/167
Fixed temperature
-40°C to +85°C
Temperature
within:
25°C
4.5V
Figure 23-29 on page
voltage & temperature
Accuracy at given
5.5V
±10%
±1%
270.
(1)
245