Datasheet ATtiny4, ATtiny5, ATtiny9, ATtiny10. Appendix A. Specification at 125C (Microchip) - 4
| Manufacturer | Microchip |
| Description | 8-bit AVR Microcontroller with 512/1024 Bytes In-System Programmable Flash |
| Pages / Page | 34 / 4 — 1.4. Clock Characteristics. 1.4.1. Accuracy of Calibrated Internal … |
| File Format / Size | PDF / 1.2 Mb |
| Document Language | English |
1.4. Clock Characteristics. 1.4.1. Accuracy of Calibrated Internal Oscillator. Table 1-2. Calibration. Accuracy at given Voltage
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Text Version of Document
link to page 24 link to page 24 link to page 4
1.4 Clock Characteristics 1.4.1 Accuracy of Calibrated Internal Oscillator
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 Figure 2-32 on page 24 and Figure 2-33 on page 24.
Table 1-2.
Calibration Accuracy of Internal RC Oscillator
Calibration Accuracy at given Voltage Method Target Frequency VCC Temperature & Temperature
(1)
Factory
8.0 MHz 3V 25°C ±10%
Calibration User
Fixed frequency within: Fixed voltage within: Fixed temp. within: ±1%
Calibration
7.3 – 8.1 MHz 1.8V – 5.5V -40°C – 125°C Note: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
1.4.2 External Clock Drive Figure 1-2.
External Clock Drive Waveform VIH1 VIL1
Table 1-3.
External Clock Drive Characteristics
VCC = 1.8 - 5.5V VCC = 2.7 - 5.5V VCC = 4.5 - 5.5V Symbol Parameter Min. Max. Min. Max. Min. Max. Units
1/tCLCL Clock Frequency 0 4 0 8 0 10 MHz tCLCL Clock Period 250 125 100 ns tCHCX High Time 100 50 33 ns tCLCX Low Time 100 50 33 ns tCLCH Rise Time 2.0 1 0.6 μs tCHCL Fall Time 2.0 1 0.6 μs ΔtCLCL Change in period from one clock cycle to the next 2 2 2 %
4 ATtiny4/5/9/10
8127D–Appendix A–AVR–08/11 Document Outline Appendix A – ATtiny4/5/9/10 Specification at 125°C 1. Electrical Characteristics 1.1 Absolute Maximum Ratings* 1.2 DC Characteristics 1.3 Speed 1.4 Clock Characteristics 1.4.1 Accuracy of Calibrated Internal Oscillator 1.4.2 External Clock Drive 1.5 System and Reset Characteristics 1.5.1 Power-On Reset 1.5.2 VCC Level Monitor 1.6 Analog Comparator Characteristics 1.7 ADC Characteristics (ATtiny5/10, only) 1.8 Serial Programming Characteristics 2. Typical Characteristics 2.1 Active Supply Current 2.2 Idle Supply Current 2.3 Power-down Supply Current 2.4 Pin Pull-up 2.5 Pin Driver Strength 2.6 Pin Threshold and Hysteresis 2.7 Analog Comparator Offset 2.8 Internal Oscillator Speed 2.9 VLM Thresholds 2.10 Current Consumption of Peripheral Units 2.11 Reset Pulsewidth 3. Ordering Information 3.1 ATtiny4 3.2 ATtiny5 3.3 ATtiny9 3.4 ATtiny10 4. Revision History
1.4 Clock Characteristics 1.4.1 Accuracy of Calibrated Internal Oscillator
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 Figure 2-32 on page 24 and Figure 2-33 on page 24.
Table 1-2.
Calibration Accuracy of Internal RC Oscillator
Calibration Accuracy at given Voltage Method Target Frequency VCC Temperature & Temperature
(1)
Factory
8.0 MHz 3V 25°C ±10%
Calibration User
Fixed frequency within: Fixed voltage within: Fixed temp. within: ±1%
Calibration
7.3 – 8.1 MHz 1.8V – 5.5V -40°C – 125°C Note: 1. Accuracy of oscillator frequency at calibration point (fixed temperature and fixed voltage).
1.4.2 External Clock Drive Figure 1-2.
External Clock Drive Waveform VIH1 VIL1
Table 1-3.
External Clock Drive Characteristics
VCC = 1.8 - 5.5V VCC = 2.7 - 5.5V VCC = 4.5 - 5.5V Symbol Parameter Min. Max. Min. Max. Min. Max. Units
1/tCLCL Clock Frequency 0 4 0 8 0 10 MHz tCLCL Clock Period 250 125 100 ns tCHCX High Time 100 50 33 ns tCLCX Low Time 100 50 33 ns tCLCH Rise Time 2.0 1 0.6 μs tCHCL Fall Time 2.0 1 0.6 μs ΔtCLCL Change in period from one clock cycle to the next 2 2 2 %
4 ATtiny4/5/9/10
8127D–Appendix A–AVR–08/11 Document Outline Appendix A – ATtiny4/5/9/10 Specification at 125°C 1. Electrical Characteristics 1.1 Absolute Maximum Ratings* 1.2 DC Characteristics 1.3 Speed 1.4 Clock Characteristics 1.4.1 Accuracy of Calibrated Internal Oscillator 1.4.2 External Clock Drive 1.5 System and Reset Characteristics 1.5.1 Power-On Reset 1.5.2 VCC Level Monitor 1.6 Analog Comparator Characteristics 1.7 ADC Characteristics (ATtiny5/10, only) 1.8 Serial Programming Characteristics 2. Typical Characteristics 2.1 Active Supply Current 2.2 Idle Supply Current 2.3 Power-down Supply Current 2.4 Pin Pull-up 2.5 Pin Driver Strength 2.6 Pin Threshold and Hysteresis 2.7 Analog Comparator Offset 2.8 Internal Oscillator Speed 2.9 VLM Thresholds 2.10 Current Consumption of Peripheral Units 2.11 Reset Pulsewidth 3. Ordering Information 3.1 ATtiny4 3.2 ATtiny5 3.3 ATtiny9 3.4 ATtiny10 4. Revision History
