ATMEGA3208 datasheet(14/68 Pages) MICROCHIP

14 / 68 page

Table 5-10. Brownout Detection (BOD) Characteristics

Symbol Description

Condition

Min. Typ. Max. Unit

VBOD

BOD detection level (falling) BODLEVEL=1.8V

1.71 1.78 1.85 V

BODLEVEL=2.7V

2.45 2.60 2.75

BODLEVEL=4.3V

4.05 4.25 4.45

VHYS

Hysteresis

BODLEVEL=1.8V

BODLEVEL=2.7V

BODLEVEL=4.3V

tBOD

Detection time

Continuous

µs

Sampled, 1 kHz

Sampled, 125 Hz

tstartup

Start-up time

Time from enable to ready

µs

ΔVLVD

Interrupt level 0

Percentage above the selected BOD

level

Interrupt level 1

Interrupt level 2

5.7

External Reset Characteristics

Table 5-11. External Reset Characteristics

Mode

Description

Condition

Min.

Typ. Max.

Unit

VVIH_RST

Input Voltage for RESET

0.7×VDD

VDD+0.2

VVIL_RST

Input Low Voltage for RESET

-0.2

0.3×VDD

tMIN_RST

Minimum pulse width on RESET pin

300

Rp_RST

RESET pull-up resistor

VReset=0V

kΩ

5.8

Oscillators and Clocks

Operating conditions:

•

VDD=3V, except where specified otherwise.

Table 5-12. 20 MHz Internal Oscillator (OSC20M) Characteristics

Symbol Description

Condition

Min. Typ.

Max. Unit

fOSC20M

Factory calibration

frequency

FREQSEL=0

TA=25°C, 3.0V

MHz

FREQSEL=1

fCAL

Frequency calibration range OSC16M(2)

14.5

17.5 MHz

OSC20M(2)

18.5

21.5 MHz

ATmega3208/4808 – 32-pin Data Sheet

Electrical Characteristics

Datasheet Preliminary

DS40002017A-page 14

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