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AT90USB646 датащи(PDF) 60 Page - ATMEL Corporation

номер детали AT90USB646
подробное описание детали  8-bit Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
PDF  459 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT90USB646 датащи(HTML) 60 Page - ATMEL Corporation

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60
7593H–AVR–11/08
ATmega32U6/AT90USB64/128
Figure 8-4.
External Reset During Operation
8.0.5
Brown-out Detection
ATmega32U6/AT90USB64/128 has an On-chip Brown-out Detection (BOD) circuit for monitor-
ing the V
CC 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..
When the BOD is enabled, and V
CC decreases to a value below the trigger level (VBOT- in Figure
8-5), the Brown-out Reset is immediately activated. When V
CC increases above the trigger level
(V
BOT+ in Figure 8-5), 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 8-1.
CC
Table 8-2.
BODLEVEL Fuse Coding
BODLEVEL 2..0 Fuses
Min V
BOT
Typ V
BOT
Max V
BOT
Units
111
BOD Disabled
110
1.8
2.0
2.2
V
101
2.0
2.2
2.4
100
2.2
2.4
2.6
011
2.4
2.6
2.8
010
3.2
3.4
3.6
001
3.3
3.5
3.7
000
4.1
4.3
4.5
Table 8-3.
Brown-out Characteristics
Symbol
Parameter
Min
Typ
Max
Units
V
HYST
Brown-out Detector Hysteresis
50
mV
t
BOD
Min Pulse Width on Brown-out Reset
ns
Ibod
Brown-out Detector Consumption
25
µA



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