AT90PWM2B-16SU View Datasheet(PDF) - Atmel Corporation

Part Name

Description

Manufacturer

AT90PWM2B-16SU

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

Atmel Corporation 

AT90PWM2/3/2B/3B

Table 9-2. BODLEVEL Fuse Coding(1)(2)

BODLEVEL 2..0 Fuses

010

Min VBOT

001

000

Typ VBOT

4.2

2.8

2.6

Max VBOT

Units

V

V

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 guar-

antees 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 9-3.

Symbol

VHYST

tBOD

Brown-out Characteristics(1)

Parameter

Brown-out Detector Hysteresis

Min Pulse Width on Brown-out Reset

Min.

Typ.

Max.

Units

70

mV

2

µs

Notes: 1. Values are guidelines only.

When the BOD is enabled, and VCC decreases to a value below the trigger level (VBOT- in Figure

9-5), the Brown-out Reset is immediately activated. When VCC increases above the trigger level

(VBOT+ in Figure 9-5), the delay counter starts the MCU after the Time-out period tTOUT has

expired.

The BOD circuit will only detect a drop in VCC if the voltage stays below the trigger level for lon-

ger than tBOD given in Table 9-3.

Figure 9-5. Brown-out Reset During Operation

VCC

VBOT-

VBOT+

RESET

TIME-OUT

tTOUT

9.0.6

INTERNAL

RESET

Watchdog Reset

When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On

the falling edge of this pulse, the delay timer starts counting the Time-out period tTOUT. Refer to

page 52 for details on operation of the Watchdog Timer.

49

4317K–AVR–03/2013

Share Link: