ATAVRSB202 Atmel, ATAVRSB202 Datasheet - Page 45

• Manufacturer Part Number: ATAVRSB202
• Description: KIT BATT MGMT FOR ATMEGA32HVB
• Manufacturer: Atmel

Specifications of ATAVRSB202

• Main Purpose: *
• Embedded: *
• Utilized Ic / Part: *
• Primary Attributes: *
• Secondary Attributes: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

11.2.4
11.3
8042B–AVR–06/10
Reset and the Voltage Reference
Brown-out Detection
Figure 11-4. Watchdog Reset During Operation
ATmega16HVB/32HVB has an On-chip Brown-out Detection (BOD) circuit for monitoring the
V
hysteresis to ensure spike free Brown-out Detection. The hysteresis on the detection level
should be interpreted as V
The BOD is automatically enabled in all modes of operation, except in Power-off mode.
When the BOD is enabled, and V
11-5), the Brown-out Reset is immediately activated. When V
level (V
expired.
Figure 11-5. Brown-out Reset During Operation
The Voltage Reference is important for the performance of the system as the VREF voltage will
be used as reference voltage for several modules. It is therefore important to notice that after a
reset condition the Voltage Reference needs calibration and settling before the VREF voltage is
accurate. For details on Voltage Reference calibration and settling time, See
and Temperature Sensor” on page
CC
level during operation by comparing it to a fixed trigger level V
BOT+
INTERNAL
TIME-OUT
RESET
RESET
in
FET
V
Figure
CC
11-5), the delay counter starts the MCU after the Time-out period t
BOT+
= V
CC
BOT
123.
V
decreases to a value below the trigger level (V
BOT-
+ V
CK
HYST
/2 and V
ATmega16HVB/32HVB
BOT-
= V
BOT
CC
V
t
TOUT
BOT+
- V
increases above the trigger
BOT
HYST
. The trigger level has a
/2.
”Voltage Reference
BOT-
in
TOUT
Figure
has
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