ATtiny25/45/85 Auto

24.7BOD Thresholds and Analog Comparator Offset

Figure 24-31. BOD Thresholds vs. Temperature (BODLEVEL Is 4.3V)

BOD THRES HOLDS vs . TEMP ERATURE

BODLEVEL = 4.3V

Thres hold (V)

4.4

4.35
			Ris ing
4.3
			Falling
4.25
4.2
4.15
4.1
4.05
4
			10 20 30 40 50 60 70 80 90 100 110 120 130 140
-50 -40 -30 -20 -10 0
			Temperature (C)

Figure 24-32. BOD Thresholds vs. Temperature (BODLEVEL Is 2.7V)

BOD THRES HOLDS vs . TEMP ERATURE

BODLEVEL = 2.7V

Thres hold (V)

2.8

Ris ing

2.75

2.7

Falling

2.65

2.6

2.55

2.5 -50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Temperature (C)

177

7598C–AVR–09/06

Figure 24-33. BOD Thresholds vs. Temperature (BODLEVEL Is 1.8V)

BOD THRES HOLDS vs . TEMPERATURE

BODLEVEL at 1.8V

Thres hold (V)

1.9
1.85
	Ris ing Vcc
1.8	Falling Vcc
1.75

1.7

1.65

1.6

-50 -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Temperature (C)

24.8Internal Oscillator Speed

Figure 24-34. Watchdog Oscillator Frequency vs. VCC)

WATCHDOC OSCILLATOR FREQUENCY vs . VCC

	0.118
	0.116
	0.114								-40 ˚C
	0.112								25 ˚C
(MHz)	0.11
RC	0.108								85 ˚C
F
	0.106
	0.104
	0.102								125 ˚C
	0.1
	1.5	2	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

178 ATtiny25/45/85 Auto

7598C–AVR–09/06

ATtiny25/45/85 Auto

Figure 24-35. Watchdog Oscillator Frequency vs. Temperature

WATCHDOG OSCILLATOR FREQUENCY vs . TEMPERATURE

	0.118
	0.116
	0.114
	0.112
(MHz)	0.11
RC	0.108
F																	1.8 V
	0.106
																	2.7 V
	0.104																3.6 V
																	4.0 V
	0.102																5.5 V
	0.1
	-40	-30	-20	-10	0	10	20	30	40	50	60	70	80	90	100	110	120
									Temperature

Figure 24-36. Calibrated 8 MHz RC Oscillator Frequency vs. Temperature

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs . TEMPERATURE

	8.4
	8.3												5.0 V
													3.0 V
	8.2
	8.1
(MHz)	8
RC	7.9
F
	7.8
	7.7
	7.6
	7.5
	-40	-30	-20	-10	0	10	20 30 40 50 60	70	80	90	100	110	120
							Temperature

179

7598C–AVR–09/06

Figure 24-37. Calibrated 8 MHz RC Oscillator Frequency vs. VCC

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs . OPERATING VOLTAGE

	8.4								125 ˚C
	8.3
	8.2								85 ˚C
	8.1
(MHz)	8								25 ˚C
RC	7.9
F
	7.8								-40 ˚C
	7.7
	7.6
	7.5
	1.5	2	2.5	3	3.5	4	4.5	5	5.5

VCC (V)

Figure 24-38. Calibrated 8 MHz RC Oscillator Frequency vs. Osccal Value

CALIBRATED 8MHz RC OSCILLATOR FREQUENCY vs . OSCCAL VALUE

	14															125	˚C
																85	˚C
																25	˚C
	12															-40 ˚C
	10
(MHz)	8
RC
F
	6
	4
	2
	0	16	32	48	64	80	96	112	128	144	160	176	192	208	224	240

OSCCAL (X1)

180 ATtiny25/45/85 Auto

7598C–AVR–09/06