AT90USB1286-16MU ATMEL [ATMEL Corporation], AT90USB1286-16MU Datasheet - Page 61

• Manufacturer Part Number: AT90USB1286-16MU
• Description: Microcontroller with 64/128K Bytes of ISP Flash and USB Controller
• Manufacturer: ATMEL [ATMEL Corporation]

7593A–AVR–02/06
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
V
Table 8-2.
Note:
Table 8-3.
When the BOD is enabled, and V
8-5), the Brown-out Reset is immediately activated. When V
(V
expired.
The BOD circuit will only detect a drop in V
longer than t
Figure 8-5.
Symbol
V
t
BOT
BOD
BOT+
HYST
+ V
BODLEVEL 2..0 Fuses
in
1. V
HYST
Figure
this is the case, the device is tested down to V
antees that a Brown-Out Reset will occur before V
operation of the microcontroller is no longer guaranteed. The test is performed using
BODLEVEL = 110 for AT90USB64/128 and BODLEVEL = 101 for AT90USB64/128L.
BOD
BOT
/2 and V
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
BODLEVEL Fuse Coding
Brown-out Characteristics
Brown-out Reset During Operation
110
101
100
011
010
001
000
111
INTERNAL
TIME-OUT
may be below nominal minimum operating voltage for some devices. For devices where
given in
8-5), the delay counter starts the MCU after the Time-out period t
RESET
RESET
V
CC
BOT-
Table
= V
BOT
8-1.
- V
CC
HYST
Min V
decreases to a value below the trigger level (V
V
BOT-
(1)
/2.
BOT
CC
if the voltage stays below the trigger level for
Typ V
CC
2.0
2.2
2.4
2.6
3.4
3.5
4.3
BOD Disabled
= V
BOT
CC
Min
BOT
drops to a voltage where correct
CC
V
t
during the production test. This guar-
TOUT
BOT+
increases above the trigger level
Typ
AT90USB64/128
50
Max V
BOT
Max
Units
Units
mV
ns
V
BOT-
TOUT
in
BOT+
Figure
has
61
=