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Рыбницкий Филиал Приднестровского Государственного Университета им.Т.Г.Шевченко

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AVR / datasheets / atmega_8.pdf

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ATmega8(L)

Pin Pull-up

Figure 143. I/O Pin Pull-up Resistor Current vs. Input Voltage (VCC = 5V)

I/O PIN PULL-UP RESISTOR CURRENT vs. INPUT VOLTAGE

				Vcc = 5V
	160
85°C
	140	25°C
		25°C
	120
	100	-40°C
	100
(uA)	80
	80
IO
I
	60
	40
	20
	0
	0	1	2	3	4	5	6

VOP (V)

Figure 144. I/O Pin Pull-up Resistor Current vs. Input Voltage (VCC = 2.7V)

I/O PIN PULL-UP RESISTOR CURRENT vs. INPUT VOLTAGE

				Vcc = 2.7V
	90
	80	25°C
85°C		25°C
	70
	60	-40°C
	60
(uA)	50
(uA)
IO	40
I	40
	30
	20
	10
	0
	0	0.5	1	1.5	2	2.5	3

VOP (V)

257

2486M–AVR–12/03

Figure 145. Reset Pull-up Resistor Current vs. Reset Pin Voltage (VCC = 5V)

RESET PULL-UP RESISTOR CURRENT vs. RESET PIN VOLTAGE

			Vcc = 5V
	100
- 40°C		25°C
	80	25°C
	80
		85°C
(uA)	60
(uA)
RESET	40
I

	20
	0
	0	1	2

VRESET (V)

Figure 146. Reset Pull-up Resistor Current vs. Reset Pin Voltage (VCC = 2.7V)

RESET PULL-UP RESISTOR CURRENT vs. RESET PIN VOLTAGE

				Vcc = 2.7V
	45
-40°C40		25°C
		25°C
	35
	30	85°C
	30
(uA)	25
(uA)
RESET	20
RESET
I
	15
	10
	5
	0
	0	0.5	1	1.5	2	2.5

VRESET (V)

258 ATmega8(L)

2486M–AVR–12/03

		ATmega8(L)


Pin Driver Strength	Figure 147. I/O Pin Source Current vs. Output Voltage (VCC = 5V)
Pin Driver Strength
	I/O PIN SOURCE CURRENT vs. OUTPUT VOLTAGE

IOH (mA)

Vcc = 5V

-40°C

25°C

85°C

VOH (V)

Figure 148. I/O Pin Source Current vs. Output Voltage (VCC = 2.7V)

IOH (mA)

I/O PIN SOURCE CURRENT vs. OUTPUT VOLTAGE

Vcc = 2.7V

-40°C

25°C

85°C

0.5

1.5

2.5

VOH (V)

259

2486M–AVR–12/03

Figure 149. I/O Pin Sink Current vs. Output Voltage (VCC = 5V)

I/O PIN SINK CURRENT vs. OUTPUT VOLTAGE

				Vcc = 5V
	90
	80					-40°C
						-40°C
	70					25°C
						25°C
	60					85°C
(mA)						85°C
	50

OL	40
I	40
	30
	20
	10
	0
	0	0.5	1	1.5	2	2.5
				VOL (V)

Figure 150. I/O Pin Sink Current vs. Output Voltage (VCC = 2.7V)

I/O PIN SINK CURRENT vs. OUTPUT VOLTAGE

				Vcc = 2.7V
	35
	30					-40°C
	30
	25					25°C
	25
						85°C
(mA)	20
(mA)
OL	15
I

	10
	5
	0
	0	0.5	1	1.5	2	2.5
				VOL (V)

260 ATmega8(L)

2486M–AVR–12/03

ATmega8(L)

Figure 151. Reset Pin as I/O – Pin Source Current vs. Output Voltage (VCC = 5V)

RESET PIN AS I/O - SOURCE CURRENT vs. OUTPUT VOLTAGE

				Vcc = 5V
	4
	3.5	-40°C
		-40°C
	3
		25°C
(mA)	2.5
(mA)		85°C
Current	2
Current	1.5
	1.5
	1
	0.5
	0
	2	2.5	3	3.5	4	4.5
				VOH (V)

Figure 152. Reset Pin as I/O – Pin Source Current vs. Output Voltage (VCC = 2.7V)

RESET PIN AS I/O - SOURCE CURRENT vs. OUTPUT VOLTAGE

				Vcc = 2.7V
	5
	4.5
25°C4		-40°C
25°C4
	3.5
(mA)	3
(mA)
Current	2.5	85°C
		85°C
	2
	1.5
	1
	0.5
	0
	0	0.5	1	1.5	2	2.5
				VOH (V)

261

2486M–AVR–12/03

Figure 153. Reset Pin as I/O – Pin Sink Current vs. Output Voltage (VCC = 5V)

RESET PIN AS I/O - SINK CURRENT vs. OUTPUT VOLTAGE

				Vcc = 5V
	14
	12					-40°C
	12
	10					25°C
	10
(mA)	8					85°C
	8

Current	6
Current
	4
	2
	0
	0	0.5	1	1.5	2	2.5
				VOL (V)

Figure 154. Reset Pin as I/O – Pin Sink Current vs. Output Voltage (VCC = 2.7V)

RESET PIN AS I/O - SINK CURRENT vs. OUTPUT VOLTAGE

				Vcc = 2.7V
	4.5
	4					-40°C
						-40°C
	3.5					25°C
	3					25°C
	3
(mA)	2.5					85°C
(mA)	2.5
Current	2
Current
	1.5
	1
	0.5
	0
	0	0.5	1	1.5	2	2.5
				VOL (V)

262 ATmega8(L)

2486M–AVR–12/03

ATmega8(L)

Pin Thresholds and

Hysteresis

Figure 155. I/O Pin Input Threshold Voltage vs. VCC (VIH, I/O Pin Read as “1”)

I/O PIN INPUT THRESHOLD VOLTAGE vs. VCC

VIH, IO PIN READ AS '1'

	2.5
							-40°C
	2						85°C
							25°C
(V)	1.5
Threshold	1
Threshold
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

Figure 156. I/O Pin Input Threshold Voltage vs. VCC (VIL, I/O Pin Read as “0”)

I/O PIN INPUT THRESHOLD VOLTAGE vs. VCC

VIL, IO PIN READ AS '0'

	2
	1.5						-40°C
	1.5						25°C
							85°C
(V)
Threshold	1
Threshold
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

263

2486M–AVR–12/03

Figure 157. I/O Pin Input Hysteresis vs. VCC

I/O PIN INPUT HYSTERESIS vs. VCC

	0.7
	0.6						85°C
							-40°C
(V)	0.5						25°C
(V)
Hysteresis	0.4
Hysteresis	0.3
Input	0.3
Input	0.2
	0.2
	0.1
	0
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 158. Reset Pin as I/O – Input Threshold Voltage vs. VCC (VIH, I/O Pin Read as “1”)

RESET PIN AS I/O - INPUT THRESHOLD VOLTAGE vs. VCC

VIH, RESET PIN READ AS '1'

	4						-40°C
							-40°C
	3.5						85°C
	3.5						25°C
							25°C
	3
(V)	2.5
(V)
Threshold	2
Threshold	1.5
	1.5
	1
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

264 ATmega8(L)

2486M–AVR–12/03

ATmega8(L)

Figure 159. Reset Pin as I/O – Input Threshold Voltage vs. VCC (VIL, I/O Pin Read as “0”)

RESET PIN AS I/O - INPUT THRESHOLD VOLTAGE vs. VCC

VIL, RESET PIN READ AS '0'

	2.5
							85°C
	2						25°C
	2						-40°C
(V)	1.5
Threshold	1
Threshold
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

Figure 160. Reset Pin as I/O – Pin Hysteresis vs. VCC

RESET PIN AS I/O - PIN HYSTERESIS vs. VCC

	2
	1.5						-40°C
(V)	1.5						85°C
(V)							25°C
Input Hysteresis	1
Input Hysteresis
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

265

2486M–AVR–12/03

Figure 161. Reset Input Threshold Voltage vs. VCC (VIH, Reset Pin Read as “1”)

RESET INPUT THRESHOLD VOLTAGE vs. VCC

VIH, RESET PIN READ AS '1'

	2.5
	2						-40°C
	2						25°C
							25°C
							85°C
(V)	1.5
Threshold	1
Threshold
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

Figure 162. Reset Input Threshold Voltage vs. VCC (VIL, Reset Pin Read as “0”)

RESET INPUT THRESHOLD VOLTAGE vs. VCC

VIL, RESET PIN READ AS '0'

	2.5
	2						85°C
							25°C
							-40°C
(V)	1.5
Threshold	1
Threshold
	0.5
	0
	2.5	3	3.5	4	4.5	5	5.5
				VCC (V)

266 ATmega8(L)

2486M–AVR–12/03

ATmega8(L)

Bod Thresholds and Analog

Comparator Offset

Figure 163. Reset Input Pin Hysteresis vs. VCC

RESET INPUT PIN HYSTERESIS vs. VCC

	1
	0.8	-40°C
		-40°C
(V)
Hysteresis	0.6
		25°C
	0.4
Input	0.4
Input		85°C
		85°C
	0.2
	0
	2	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 164. BOD Thresholds vs. Temperature (BOD Level is 4.0V)

BOD THRESHOLDS vs. TEMPERATURE

BODLEVEL IS 4.0V

	4.3
	4.3
	4.2
	4.2					Rising VCC
						Rising VCC
(V)	4.1
	4.1

Threshold	4
	4				Falling VCC
					Falling VCC
	3.9
	3.9
	3.8
	3.8
	3.7
	3.7
	-50 -40 -30 -20 -10	0	10	20		30	40	50	60	70	80	90 100
				Temperature (˚C)

267

2486M–AVR–12/03

Figure 165. BOD Thresholds vs. Temperature (BOD Level is 2.7v)

BOD THRESHOLDS vs. TEMPERATURE

Threshold (V)

BODLEVEL IS 2.7V

2.8

2.7

Rising VCC

2.6

Falling VCC

2.5

2.4

-50

-40

-30

-20

-10

100

Temperature (˚C)

Figure 166. Bandgap Voltage vs. VCC

BANDGAP VOLTAGE vs. VCC

	1.315
	1.31						-40°
(V)							85°
Voltage	1.305						85°
Voltage							25°
Bandgap	1.3
Bandgap
	1.295
	1.29
	2.5	3	3.5	4	4.5	5	5.5

Vcc (V)

268 ATmega8(L)

2486M–AVR–12/03

ATmega8(L)

Figure 167. Analog Comparator Offset Voltage vs. Common Mode Voltage (VCC = 5V)

ANALOG COMPARATOR OFFSET VOLTAGE vs. COMMON MODE VOLTAGE

						VCC = 5V
	0.003
	0.002
(V)	0.001
(V)
Voltage	0
Voltage	-0.001
Offset	-0.001										85°
											85°
	-0.002
Comparator	-0.002
	-0.003
	-0.004										25°


	-0.005
											-40°
	-0.006
	0	0.5	1	1.5	2	2.5	3	3.5	4	4.5	5

Common Mode Voltage (V)

Figure 168. Analog Comparator Offset Voltage vs. Common Mode Voltage (VCC = 2.7V)

ANALOG COMPARATOR OFFSET VOLTAGE vs. COMMON MODE VOLTAGE

				VCC = 2.7V
	0.003
	0.002
(V)	0.001
(V)
Voltage	0
Voltage
Offset	-0.001						85°
Offset
Comparator
	-0.002						25°
							25°
	-0.003
	-0.004						-40°
							-40°
	-0.005
	0	0.5	1	1.5	2	2.5	3
				Common Mode Voltage (V)

269

2486M–AVR–12/03

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Pin Pull-up

Pin Driver Strength