ATtiny43U Atmel Corporation, ATtiny43U Datasheet - Page 157

• Manufacturer Part Number: ATtiny43U
• Manufacturer: Atmel Corporation

Specifications of ATtiny43U

• Flash (kbytes): 4 Kbytes
• Pin Count: 20
• Max. Operating Frequency: 8 MHz
• Cpu: 8-bit AVR
• # Of Touch Channels: 8
• Hardware Qtouch Acquisition: No
• Max I/o Pins: 16
• Ext Interrupts: 16
• Usb Speed: No
• Usb Interface: No
• Spi: 1
• Twi (i2c): 1
• Graphic Lcd: No
• Video Decoder: No
• Camera Interface: No
• Adc Channels: 4
• 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
• 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: 0.7 to 5.5
• Operating Voltage (vcc): 0.7 to 5.5
• Fpu: No
• Mpu / Mmu: no / no
• Timers: 2
• Output Compare Channels: 4
• Pwm Channels: 4
• 32khz Rtc: No
• Calibrated Rc Oscillator: Yes

20.4
20.4.1
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.
Table 20-2.
Notes:
20.4.2
Figure 20-2. External Clock Drive Waveforms
Table 20-3.
8048B–AVR–03/09
Calibration
Method
Factory
Calibration
User
Calibration
Symbol
1/t
t
t
t
t
t
Δ
CLCL
CHCX
CLCX
CLCH
CHCL
t
CLCL
CLCL
Clock Characteristics
1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
Calibrated Internal Oscillator Accuracy
External Clock Drive
Calibration Accuracy of Internal Oscillator
External Clock Drive Characteristics
Parameter
Clock Frequency
Clock Period
High Time
Low Time
Rise Time
Fall Time
Period change from clock cycle to next
Fixed frequency within:
V
Target Frequency
IL1
7.3 - 8.1 MHz
V
8.0 MHz
IH1
Fixed voltage within:
1.8V - 5.5V
V
3V
CC
Min.
Fixed temperature within:
250
100
100
V
0
CC
= 1.8 - 5.5V
Temperature
-40°C - 85°C
25°C
Max.
2.0
2.0
4
2
Min.
125
V
50
50
0
CC
Accuracy at given Voltage
= 2.7 - 5.5V
& Temperature
Max.
1.6
1.6
8
2
±10%
±1%
Units
(1)
MHz
ns
ns
μs
μs
ns
%
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