Internal Oscillator Speed

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Московский государственный технический университет им. H.Э.Баумана

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Микропроцессорные устройства систем управления

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08 семестр / Разное / Скамко / inform / ATmega8.pdf

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04.03.2014

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Internal Oscillator Speed	Figure 169. Watchdog Oscillator Frequency vs. VCC

WATCHDOG OSCILLATOR FREQUENCY vs. VCC

	1260						-40°C
							-40°C
	1240						25°C
	1240
	1220						85°C
	1220
(kHz)	1200
(kHz)	1180
RC	1180
RC
F	1160
	1160
	1140
	1120
	1100
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 170. Calibrated 8 MHz RC Oscillator Frequency vs. Temperature

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs. TEMPERATURE

	8.5
		5.5V
	8.3
	8.1	4.0V
		4.0V
	7.9
(MHz)	7.7
(MHz)	7.5	2.7V
RC		2.7V
F	7.3
	7.3
	7.1
	6.9
	6.7
	6.5
	-60	-40	-20	0	20	40	60	80	100

Temperature (˚C)

272 ATmega8(L)

2486O–AVR–10/04

ATmega8(L)

Figure 171. Calibrated 8 MHz RC Oscillator Frequency vs. VCC

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs. VCC

	8.5
							-40°C
	8.3
	8.1						25°C
	7.9						85°C
							85°C
(MHz)	7.7
(MHz)	7.5
RC
F	7.3
	7.3
	7.1
	6.9
	6.7
	6.5
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 172. Calibrated 8 MHz RC Oscillator Frequency vs. Osccal Value

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs. OSCCAL VALUE

	16
	14
	12
(MHz)	10
RC
F
	8
	6
	4
	0	16	32	48	64	80	96	112	128	144	160	176	192	208	224	240

OSCCAL VALUE

273

2486O–AVR–10/04

Figure 173. Calibrated 4 MHz RC Oscillator Frequency vs. Temperature

CALIBRATED 4MHz RC OSCILLATOR FREQUENCY vs. TEMPERATURE

	4.2
		5.5V
	4.1
	4	4.0V
	4
(MHz)	3.9
(MHz)		2.7V
RC	3.8
F	3.8
	3.7
	3.6
	3.5
	-60	-40	-20	0	20	40	60	80	100

Temperature (˚C)

Figure 174. Calibrated 4 MHz RC Oscillator Frequency vs. VCC

CALIBRATED 4MHz RC OSCILLATOR FREQUENCY vs. VCC

	4.2
	4.1						-40°C
	4.1
	4						25°C
	4
							85°C
(MHz)	3.9
(MHz)
RC	3.8
F	3.8
	3.7
	3.6
	3.5
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

274 ATmega8(L)

2486O–AVR–10/04

ATmega8(L)

Figure 175. Calibrated 4 MHz RC Oscillator Frequency vs. Osccal Value

CALIBRATED 4MHz RC OSCILLATOR FREQUENCY vs. OSCCAL VALUE

	8
	7
	6
(MHz)	5
RC
F
	4
	3
	2
	0	16	32	48	64	80	96	112	128	144	160	176	192	208	224	240

OSCCAL VALUE

Figure 176. Calibrated 2 MHz RC Oscillator Frequency vs. Temperature

CALIBRATED 2MHz RC OSCILLATOR FREQUENCY vs. TEMPERATURE

	2.1
		5.5V
	2.05
	2	4.0V
	2
(MHz)	1.95
RC
F		2.7V
		2.7V
	1.9
	1.85
	1.8
	-60	-40	-20	0	20	40	60	80	100

Temperature (˚C)

275

2486O–AVR–10/04

Figure 177. Calibrated 2 MHz RC Oscillator Frequency vs. VCC

CALIBRATED 2MHz RC OSCILLATOR FREQUENCY vs. VCC

	2.2
	2.1
							-40°C
							25°C
(MHz)	2
							85°C

RC
F	1.9
	1.9
	1.8
	1.7
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 178. Calibrated 2 MHz RC Oscillator Frequency vs. Osccal Value

CALIBRATED 2MHz RC OSCILLATOR FREQUENCY vs. OSCCAL VALUE

	3.8
	3.3
	2.8
(MHz)	2.3
RC
F
	1.8
	1.3
	0.8
	0	16	32	48	64	80	96	112	128	144	160	176	192	208	224	240

OSCCAL VALUE

276 ATmega8(L)

2486O–AVR–10/04

ATmega8(L)

Figure 179. Calibrated 1 MHz RC Oscillator Frequency vs. Temperature

CALIBRATED 1MHz RC OSCILLATOR FREQUENCY vs. TEMPERATURE

	1.04
		5.5V
	1.02
	1	4.0V
	1
(MHz)	0.98
(MHz)		2.7V
RC	0.96	2.7V
RC
F
	0.94
	0.92
	0.9
	-60	-40	-20	0	20	40	60	80	100

Temperature (˚C)

Figure 180. Calibrated 1 MHz RC Oscillator Frequency vs. VCC

CALIBRATED 1MHz RC OSCILLATOR FREQUENCY vs. VCC

	1.1
	1.05
							-40°C
(MHz)							25°C
(MHz)	1						85°C
RC							85°C
RC
F
	0.95
	0.9
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

277

2486O–AVR–10/04

Current Consumption of

Peripheral Units

Figure 181. Calibrated 1 MHz RC Oscillator Frequency vs. Osccal Value

CALIBRATED 1MHz RC OSCILLATOR FREQUENCY vs. OSCCAL VALUE

	1.9
	1.7
	1.5
(MHz)	1.3
(MHz)
RC	1.1
F	1.1
	0.9
	0.7
	0.5
	0	16	32	48	64	80	96	112	128	144	160	176	192	208	224	240

OSCCAL VALUE

Figure 182. Brown-out Detector Current vs. VCC

BROWN-OUT DETECTOR CURRENT vs. VCC

	30
	25
	20						-40°C
	20
							25°C
(uA)							85°C
(uA)	15
CC	15
CC
I
	10
	5
	0
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

278 ATmega8(L)

2486O–AVR–10/04

ATmega8(L)

Figure 183. ADC Current vs. VCC (AREF = AVCC)

ADC CURRENT vs. VCC

AREF = AVCC

	450
	400						25°C
						-40°C	25°C
						-40°C
	350
	300						85°C
	300
(uA)	250
(uA)
CC	200
I	200
	150
	100
	50
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

Figure 184. AREF External Reference Current vs. VCC

AREF EXTERNAL REFERENCE CURRENT vs. VCC

250
200						85°C
200
					25°C
150					-40°C
150
(uA)
CC
I
100
50
0
2.5	3	3.5	4	4.5	5	5.5

VCC (V)

279

2486O–AVR–10/04

Figure 185. 32 kHz TOSC Current vs. VCC (Watchdog Timer Disabled)

32 kHz TOSC CURRENT vs. VCC

WATCHDOG TIMER DISABLED

25
20
						25°C
15
(uA)
CC
I
10
5
0
2.5	3	3.5	4	4.5	5	5.5
			VCC (V)

Figure 186. Watchdog Timer Current vs. VCC

WATCHDOG TIMER CURRENT vs. VCC

	80
	70							85°C
								25°C
	60							-40°C
								-40°C
	50
(uA)	40
CC	40
CC
I
	30
	20
	10
	0
	2	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

280 ATmega8(L)

2486O–AVR–10/04

ATmega8(L)

Figure 187. Analog Comparator Current vs. VCC

ANALOG COMPARATOR CURRENT vs. VCC

	100
							85°C
	90						25°C
							25°C
	80						-40°C
							-40°C
	70
	60
(uA)	50
CC	50
CC
I	40
	40
	30
	20
	10
	0
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 188. Programming Current vs. VCC

PROGRAMMING CURRENT vs. VCC

	7
							-40°C
	6
	5						25°C
	5
(mA)	4						85°C
	4

CC	3
I

	2
	1
	0
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

281

2486O–AVR–10/04



Current Consumption in	Figure 189. Reset Supply Current vs. VCC (0.1 - 1.0 MHz, Excluding Current Through
Reset and Reset Pulsewidth	The Reset Pull-up)

RESET SUPPLY CURRENT vs. VCC

0.1 - 1 MHz, EXCLUDING CURRENT THROUGH THE RESET PULL-UP

	4
	3.5										5.5V
	3.5
	3										5.0V
	3
	2.5										4.5V
	2.5
(mA)											4.0V
(mA)	2										3.3V
CC											3.3V
I											3.0V
	1.5										3.0V
	1.5										2.7V
											2.7V
	1
	0.5
	0
	0	0.1	0.2	0.3	0.4	0.5	0.6	0.7	0.8	0.9	1
						Frequency (MHz)

Figure 190. Reset Supply Current vs. VCC (1 - 20 MHz, Excluding Current Through The

Reset Pull-up)

RESET SUPPLY CURRENT vs. VCC

1 - 20 MHz, EXCLUDING CURRENT THROUGH THE RESET PULL-UP

25
										5.5V
20										5.0V
										5.0V
										4.5V
15
(mA)
CC
I
10
								3.3V
5						3.0V
						3.0V
					2.7V
0
0	2	4	6	8	10	12	14	16	18	20

Frequency (MHz)

282 ATmega8(L)

2486O–AVR–10/04

ATmega8(L)

Figure 191. Reset Pulse Width vs. VCC

RESET PULSE WIDTH vs. VCC

	1400
	1200
	1000
(ns)	800
Pulsewidth	800
	600
							85°C
	400						25°C
							-40°C
	200
	0
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

283

2486O–AVR–10/04

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