AT90CAN128-16AE ATMEL Corporation, AT90CAN128-16AE Datasheet - Page 51

• Manufacturer Part Number: AT90CAN128-16AE
• Description: 8-bit Avr Microcontroller With 128K Bytes of Isp Flash And CAN Controller.flash (Kbytes) 128 Vcc (V) 2.7-5.5 EEPROM (Kbytes) 4 SRAM (bytes) 4K CAN (mess. Obj.) 15
• Manufacturer: ATMEL Corporation

Brown-out Detection
4250C–CAN–03/04
Figure 25. External Reset During Operation
AT90CAN128 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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
Table 20. BODLEVEL Fuse Coding
Notes:
Table 21. Brown-out Characteristics
Notes:
When the BOD is enabled, and V
in Figure 26), the Brown-out Reset is immediately activated. When V
Symbol
V
t
BOD
HYST
BODLEVEL 2..0 Fuses
CC
1. V
2. Values are guidelines only.
1. Values are guidelines only.
devices where this is the case, the device is tested down to V
production test. This guarantees that a Brown-Out Reset will occur before V
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 .
BOT
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
101
100
010
001
000
111
110
011
BOT+
may be below nominal minimum operating voltage for some devices. For
= V
BOT
+ V
HYST
CC
/2 and V
Min V
(1)(2)
(1)
decreases to a value below the trigger level (V
BOT
BOT-
= V
Typ V
Min.
BOT
4.1
4.0
3.9
3.8
2.7
2.6
2.5
BOD Disabled
- V
BOT
HYST
Typ.
TBD
TBD
AT90CAN128
/2.
Max V
CC
CC
Max.
increases above
BOT
= V
BOT
during the
CC
Units
Units
mV
V
V
V
V
V
V
V
µs
drops
BOT-
51
CC