XMEGAD datasheet(84/309 Pages) ATMEL

84 / 309 page

8210B–AVR–04/10

XMEGA D

8.4.2

Brown-Out Detection

The Brown-Out Detection (BOD) circuit monitors that the V

CC level is kept above a configurable

trigger level, V

BOT. When the BOD is enabled, a BOD reset will be given if the VCC level falls bel-

low the trigger level for a minimum time, t

BOD. The reset is kept active until the VCC level rises

above the trigger level again.

Figure 8-4.

Brown-out Detection reset.

For characterization data on t

BOD consult the device datasheet. The trigger level is determined

by a programmable BODLEVEL setting, see Table 8-2.

Note:

1. The values here are nominal values only. For typical, maximum and minimum numbers consult

the device datasheet.

The BOD circuit has 3 modes of operation:

• Disabled: In this mode there is no monitoring of the V

CC level, and hence it is only

recommended for applications where the power supply is stable.

• Enabled: In this mode the V

CC level is continuously monitored, and a drop in VCC below VBOT

for at least t

BOD will give a brown-out reset.

Table 8-2.

Programmable BODLEVEL setting

BODLEVEL[2:0] (1)

BOT

UNIT

111

1.6

110

1.8

101

2.0

100

2.2

011

2.4

010

2.6

001

2.8

000

3.0

VCC

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

tBOD

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