AT90PWM81-16SN Atmel, AT90PWM81-16SN Datasheet - Page 52

• Manufacturer Part Number: AT90PWM81-16SN
• Description: IC MCU AVR 8K FLASH ISP 20SOIC
• Manufacturer: Atmel
• Series: AVR® 90PWM Lightingr

Specifications of AT90PWM81-16SN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 16MHz
• Connectivity: SPI
• Peripherals: Brown-out Detect/Reset, PWM, WDT
• Number Of I /o: 16
• Program Memory Size: 8KB (8K x 8)
• Program Memory Type: FLASH
• Eeprom Size: 512 x 8
• Ram Size: 256 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b; D/A 1x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 20-SOIC (7.5mm Width)
• Data Bus Width: 8 bit
• Data Ram Size: 256 B
• Interface Type: SPI
• Maximum Clock Frequency: 16 MHz
• Number Of Timers: 1
• Maximum Operating Temperature: + 105 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• On-chip Dac: 10 bit, 1 Channel
• Height: 2.35 mm
• Length: 13 mm
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 2.7 V
• Width: 7.6 mm
• For Use With: ATSTK600-SOIC - STK600 SOCKET/ADAPTER FOR SOIC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

7.1.5
52
AT90PWM81
Brown-out Detection
AT90PWM81 has an On-chip Brown-out Detection (BOD) circuit for monitoring the V
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 hys-
teresis on the detection level should be interpreted as V
V
Table 7-2.
Notes:
Table 7-3.
Notes:
When V
immediately activated. When V
ter starts the MCU after the Time-out period t
The BOD circuit will only detect a drop in V
t
BOD
Symbol
V
t
HYST
BOD
HYST
given in
/2.
BODLEVEL 2..0 Fuses
CC
1. V
2. Values are guidelines only.
1. Values are guidelines only.
( default configuration)
decreases to a value below the trigger level (V
case, the device is tested down to V
Out Reset will occur before V
longer guaranteed. The test is performed using BODLEVEL = 010 for Low Operating Voltageand
BODLEVEL = 101for High Operating Voltage.
Table
BOT
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 this is the
110
101
100
011
010
001
000
111
7-3.
CC
increases above the trigger level (V
CC
drops to a voltage where correct operation of the microcontroller is no
(1)
(1)(2)
Min V
CC
CC
TOUT
3.9
2.5
= V
if the voltage stays below the trigger level for longer than
BOT
BOT
has expired.
during the production test. This guarantees that a Brown-
Forbidden, BOD must be enabled
BOT+
BOT-
Typ V
Min.
= V
4.5
2.7
4.3
4.4
4.2
2.8
2.7
in
BOT
Figure
BOT
BOT+
+ V
Typ.
in
70
7-5), the Brown-out Reset is
2
HYST
Figure
Max V
/2 and V
4.6
2.9
7-5), the delay coun-
Max.
BOT
CC
7734P–AVR–08/10
BOT-
level during
= V
Units
Units
mV
V
V
V
V
V
V
V
µs
BOT
-