AT90PWM2 datasheet(47/365 Pages) ATMEL

47 / 365 page

AT90PWM2/3

4317B–AVR–02/05

Figure 20. External Reset During Operation

Brown-out Detection

AT90PWM2/3 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V

level during operation by comparing it to a fixed trigger level. The trigger level for the

BOD can be selected by the BODLEVEL Fuses. The trigger level has a hysteresis to

ensure spike free Brown-out Detection. The hysteresis on the detection level should be

interpreted as V

BOT+ = VBOT + VHYST/2 and VBOT- = VBOT - VHYST/2.

Notes:

1. V

BOT may be below nominal minimum operating voltage for some devices. For

devices where this is the case, the device is tested down to V

CC = 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.

The test is performed using BODLEVEL = 010 for Low Operating Voltage and

BODLEVEL = 101 for High Operating Voltage .

2. Values are guidelines only.

Notes:

1. Values are guidelines only.

Table 15. BODLEVEL Fuse Coding(1)(2)

BODLEVEL 2..0 Fuses

Min VBOT

Typ VBOT

Max VBOT

Units

111

BOD Disabled

110

4.5

101

2.7

100

4.3

011

4.4

010

4.2

001

2.8

000

2.6

Table 16. Brown-out Characteristics(1)

Symbol

Parameter

Min.

(TBD)

Typ.

(TBD)

Max.

(TBD)Units

HYST

Brown-out Detector Hysteresis

TBD

tBOD

Min Pulse Width on Brown-out Reset

TBD

µs

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