AT90PWM2(2005) View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2
(Rev.:2005)

8-bit Microcontroller with 8K Bytes In-System Programmable Flash

Atmel Corporation 

Figure 20. External Reset During Operation

CC

AT90PWM2/3

Brown-out Detection

4317B–AVR–02/05

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

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

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

BODLEVEL 2..0 Fuses

111

Min VBOT

Typ VBOT

Max VBOT

BOD Disabled

Units

110

4.5

V

101

2.7

V

100

4.3

V

011

4.4

V

010

4.2

V

001

2.8

V

000

2.6

V

Notes:

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.

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

BODLEVEL = 101 for High Operating Voltage .

2. Values are guidelines only.

Table 16. Brown-out Characteristics(1)

Symbol

VHYST

tBOD

Parameter

Brown-out Detector Hysteresis

Min Pulse Width on Brown-out Reset

Min.

(TBD)

Typ.

(TBD)

TBD

TBD

Max.

(TBD)

Units

mV

µs

Notes: 1. Values are guidelines only.

47

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