ATmega324P datasheet(332/377 Pages) ATMEL

332 / 377 page

332

7674F–AVR–09/09

ATmega164P/324P/644P

26.4

System and Reset Characteristics

Notes: 1. Values indicated represent typical data from design simulation.

2. The Power-on Reset will not work unless the supply voltage has been below VPOT (falling)

3. This is the limit to which VDD can be lowered without losing RAM data.

Note:

1. VBOT may be below nominal minimum operating voltage for some devices. For devices where this is the case, the device is

tested down to VCC = VBOT during the production test. This guarantees that a Brown-Out Reset will occur before VCC drops to

a voltage where correct operation of the microcontroller is no longer guaranteed.

Table 26-4.

Reset, Brown-out and Internal Voltage Reference Characteristics

Symbol

Parameter

Condition

Min

Typ

Max

Units

tRST

(1)

Minimum pulse width on RESET Pin

2.5

VHYST

Brown-out Detector Hysteresis

RAM

(3)

RAM Retention Voltage(1)

BOD

(1)

Min Pulse Width on Brown-out Reset

VBG

Bandgap reference voltage

VC C= 2.7V, TA = 25° C1.0

1.1

1.2

tBG

(1)

Bandgap reference start-up time

C C= 2.7V, TA = 25° C40

µs

IBG

(1)

Bandgap reference current consumption

C C= 2.7V, TA = 25° C10

µA

Table 26-5.

BODLEVEL Fuse Coding

(1)

BODLEVEL 2:0 Fuses

Min V

BOT

Typ V

BOT

Max V

BOT

Units

111

BOD Disabled

110

Reserved

101

2.5

2.7

2.9

100

4.1

4.3

4.5

011

Reserved

010

001

000

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