ATMEGA328P-AU Atmel, ATMEGA328P-AU Datasheet - Page 50

• Manufacturer Part Number: ATMEGA328P-AU
• Description: MCU AVR 32K FLASH 32TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA328P-AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: I²C, SPI, UART/USART
• Peripherals: Brown-out Detect/Reset, POR, PWM, WDT
• Number Of I /o: 23
• Program Memory Size: 32KB (16K x 16)
• Program Memory Type: FLASH
• Eeprom Size: 1K x 8
• Ram Size: 2K 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: 32-TQFP, 32-VQFP
• Processor Series: ATMEGA32x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 2 KB
• Interface Type: 2-Wire, SPI, USART
• Maximum Clock Frequency: 20 MHz
• Number Of Programmable I/os: 23
• Number Of Timers: 3
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 10 bit, 8 Channel
• Cpu Family: ATmega
• Device Core: AVR
• Device Core Size: 8b
• Frequency (max): 20MHz
• Total Internal Ram Size: 2KB
• # I/os (max): 23
• Number Of Timers - General Purpose: 3
• Operating Supply Voltage (typ): 2.5/3.3/5V
• Operating Supply Voltage (max): 5.5V
• Operating Supply Voltage (min): 1.8V
• Instruction Set Architecture: RISC
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 32
• Package Type: TQFP
• Controller Family/series: AVR MEGA
• No. Of I/o's: 23
• Eeprom Memory Size: 1KB
• Ram Memory Size: 2KB
• Cpu Speed: 20MHz
• Rohs Compliant: Yes
• For Use With: ATSTK600 - DEV KIT FOR AVR/AVR32770-1007 - ISP 4PORT ATMEL AVR MCU SPI/JTAGATAVRDRAGON - KIT DRAGON 32KB FLASH MEM AVR
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: ATMEGA328P-20AU; ATMEGA328P-20AU; Q3790246

11.4
11.5
8271D–AVR–05/11
External Reset
Brown-out Detection
Figure 11-3. MCU Start-up, RESET Extended Externally
An External Reset is generated by a low level on the RESET pin. Reset pulses longer than the
minimum pulse width (see
reset, even if the clock is not running. Shorter pulses are not guaranteed to generate a reset.
When the applied signal reaches the Reset Threshold Voltage – V
delay counter starts the MCU after the Time-out period – t
can be disabled by the RSTDISBL fuse, see
Figure 11-4. External Reset During Operation
ATmega48A/PA/88A/PA/168A/PA/328/P has an On-chip Brown-out Detection (BOD) circuit for
monitoring the V
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 inter-
preted as V
decreases to a value below the trigger level (V
Reset is immediately activated. When V
5 on page
The BOD circuit will only detect a drop in V
ger than t
INTERNAL
TIME-OUT
RESET
RESET
BOD
V
51), the delay counter starts the MCU after the Time-out period t
CC
CC
BOT+
given in
= V
CC
level during operation by comparing it to a fixed trigger level. The trigger level
BOT
ATmega48A/PA/88A/PA/168A/PA/328/P
”System and Reset Characteristics” on page
+ V
HYST
V
”System and Reset Characteristics” on page
POT
/2 and V
BOT-
CC
increases above the trigger level (V
CC
= V
Table 28-7 on page
if the voltage stays below the trigger level for lon-
V
BOT
BOT-
RST
t
- V
TOUT
in
HYST
Figure 11-5 on page
TOUT
/2.When the BOD is enabled, and V
– has expired. The External Reset
299.
RST
324.
– on its positive edge, the
TOUT
324) will generate a
51), the Brown-out
BOT+
has expired.
in
Figure 11-
50
CC