AT90PWM216-16SE ATMEL [ATMEL Corporation], AT90PWM216-16SE Datasheet - Page 47

• Manufacturer Part Number: AT90PWM216-16SE
• Description: 8-bit Microcontroller with 16K Bytes In-System Programmable flash
• Manufacturer: ATMEL [ATMEL Corporation]

9.0.5
7710D–AVR–08/09
Brown-out Detection
AT90PWM216/316 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
V
Table 9-2.
Notes:
Table 9-3.
Notes:
When the BOD is enabled, and V
9-5), the Brown-out Reset is immediately activated. When V
(V
expired.
The BOD circuit will only detect a drop in V
ger than t
Symbol
V
t
BOT
BOD
BOT+
HYST
+ V
BODLEVEL 2..0 Fuses
in
1. V
2. Values are guidelines only.
1. Values are guidelines only.
HYST
BOD
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 = 010 for Low Operating Voltage and BODLEVEL = 101 for High Operating Volt-
age .
BOT
/2 and V
given in
BODLEVEL Fuse Coding
Brown-out Characteristics
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
may be below nominal minimum operating voltage for some devices. For devices where
111
110
101
100
011
010
001
000
9-5), the delay counter starts the MCU after the Time-out period t
BOT-
Table
= V
9-3.
BOT
- V
CC
HYST
decreases to a value below the trigger level (V
Min V
(1)(2)
/2.
(1)
CC
BOT
if the voltage stays below the trigger level for lon-
CC
= V
Typ V
CC
Min.
4.5
2.7
4.3
4.4
4.2
2.8
2.6
BOT
drops to a voltage where correct
BOD Disabled
CC
BOT
AT90PWM216/316
during the production test. This guar-
increases above the trigger level
Typ.
70
2
Max V
Max.
BOT
BOT-
TOUT
in
Units
Units
mV
BOT+
Figure
V
V
V
V
V
V
V
µs
has
47
CC
=