ATMEGA645A-AU Atmel, ATMEGA645A-AU Datasheet - Page 49
![IC MCU AVR 64K FLASH 64TQFP](/photos/12/13/121332/313-64-tqfp_sml.jpg)
ATMEGA645A-AU
Manufacturer Part Number
ATMEGA645A-AU
Description
IC MCU AVR 64K FLASH 64TQFP
Manufacturer
Atmel
Series
AVR® ATmegar
Specifications of ATMEGA645A-AU
Core Processor
AVR
Core Size
8-Bit
Speed
16MHz
Connectivity
SPI, UART/USART, USI
Peripherals
Brown-out Detect/Reset, POR, PWM, WDT
Number Of I /o
54
Program Memory Size
64KB (32K x 16)
Program Memory Type
FLASH
Eeprom Size
2K x 8
Ram Size
4K x 8
Voltage - Supply (vcc/vdd)
1.8 V ~ 5.5 V
Data Converters
A/D 8x10b
Oscillator Type
Internal
Operating Temperature
-40°C ~ 85°C
Package / Case
64-TQFP
Processor Series
ATmega
Core
AVR
Data Bus Width
8 bit
Data Ram Size
4 KB
Interface Type
SPI, USART
Maximum Clock Frequency
16 MHz
Number Of Programmable I/os
54
Number Of Timers
3
Operating Supply Voltage
3.3 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Operating Temperature Range
- 40 C to + 85 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Available stocks
Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
ATMEGA645A-AUR
Manufacturer:
HONEYWELL
Quantity:
101
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10.2.3
10.2.4
8285B–AVR–03/11
Brown-out Detection
Watchdog Reset
ATmega165A/165PA/325A/325PA/3250A/3250PA/6
ATmega165A/165PA/325A/325PA/3250A/3250PA/645A/645P/6450A/6450P has an On-chip
Brown-out Detection (BOD) circuit for monitoring the V
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
in
trigger level (V
t
The BOD circuit will only detect a drop in V
ger than t
Figure 10-5. Brown-out Reset During Operation
When the Watchdog times out, it will generate a short reset pulse of one CK cycle duration. On
the falling edge of this pulse, the delay timer starts counting the Time-out period t
page 50
Figure 10-6. Watchdog Reset During Operation
TOUT
HYST
Figure
has expired.
/2.When the BOD is enabled, and V
for details on operation of the Watchdog Timer.
BOD
10-5), the Brown-out Reset is immediately activated. When V
CC
given in
BOT+
INTERNAL
TIME-OUT
RESET
RESET
in
V
CC
”System and Reset Characteristics” on page
Figure
10-5), the delay counter starts the MCU after the Time-out period
V
CK
BOT-
CC
CC
decreases to a value below the trigger level (V
if the voltage stays below the trigger level for lon-
BOT+
CC
= V
level during operation by comparing it
BOT
V
t
TOUT
BOT+
+ V
326.
HYST
CC
/2 and V
increases above the
BOT-
TOUT
. Refer to
= V
BOT
BOT-
49
-
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