AT90PWM2 datasheet(49/365 Pages) ATMEL

49 / 365 page

4317K–AVR–03/2013

AT90PWM2/3/2B/3B

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 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.

Notes:

1. Values are guidelines only.

When the BOD is enabled, and V

CC decreases to a value below the trigger level (VBOT- in Figure

9-5), the Brown-out Reset is immediately activated. When V

CC increases above the trigger level

BOT+ 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 V

CC if the voltage stays below the trigger level for lon-

ger than t

BOD given in Table 9-3.

Figure 9-5.

Brown-out Reset During Operation

9.0.6

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 t

TOUT. Refer to

page 52 for details on operation of the Watchdog Timer.

010

4.2

001

2.8

000

2.6

Table 9-3.

Brown-out Characteristics

(1)

Symbol

Parameter

Min.

Typ.

Max.

Units

HYST

Brown-out Detector Hysteresis

tBOD

Min Pulse Width on Brown-out Reset

µs

Table 9-2.

BODLEVEL Fuse Coding

(1)(2)

BODLEVEL 2..0 Fuses

Min VBOT

Typ VBOT

Max VBOT

Units

VCC

RESET

TIME-OUT

INTERNAL

RESET

VBOT-

VBOT+

tTOUT

AT90PWM2 Datasheet(PDF) 49 Page - ATMEL Corporation

AT90PWM2 Datasheet(HTML) 49 Page - ATMEL Corporation

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL