AT90PWM1-16MU Atmel, AT90PWM1-16MU Datasheet - Page 45

• Manufacturer Part Number: AT90PWM1-16MU
• Description: IC AVR PWM 8KB FLASH 16MHZ 32QFN
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM1-16MU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 19
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 32-QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

9.0.5
4378C–AVR–09/08
Brown-out Detection
AT90PWM1 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
ing 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
longer 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
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 .
BOD
BOT
/2 and V
BODLEVEL Fuse Coding
Brown-out Characteristics
Parameter
Brown-out Detector Hysteresis
Min Pulse Width on Brown-out Reset
101
100
010
001
000
may be below nominal minimum operating voltage for some devices. For devices where
110
011
111
given in
9-5), the delay counter starts the MCU after the Time-out period t
BOT-
Table
= V
BOT
9-3.
- V
CC
HYST
decreases to a value below the trigger level (V
Min V
(1)(2)
/2.
(1)
BOT
CC
if the voltage stays below the trigger level for
CC
4.2
2.8
2.6
Typ V
= V
Min.
4.5
2.7
4.3
4.4
BOT
BOD Disabled
CC
CC
BOT
during the production test. This guar-
increases above the trigger level
drops to a voltage where correct
Typ.
70
2
Max V
AT90PWM1
Max.
BOT
BOT-
CC
level dur-
TOUT
in
Units
Units
mV
BOT+
Figure
V
V
V
V
V
V
V
µs
has
45
=