ATMEGA328P-AU Atmel, ATMEGA328P-AU Datasheet - Page 32

MCU AVR 32K FLASH 32TQFP

ATMEGA328P-AU

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

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8.5
8271C–AVR–08/10
Low Frequency Crystal Oscillator
The Low-frequency Crystal Oscillator is optimized for use with a 32.768 kHz watch crystal.
When selecting crystals, load capacitance and crystal’s Equivalent Series Resistance, ESR
must be taken into consideration. Both values are specified by the crystal vendor.
ATmega48A/48PA/88A/88PA/168A/168PA/328/328P oscillator is optimized for very low power
consumption, and thus when selecting crystals, see
tions on 6.5 pF, 9.0 pF and 12.5 pF crystals
Table 8-7.
Note:
The Low-frequency Crystal Oscillator provides an internal load capacitance, see
each TOSC pin.
Table 8-8.
The capacitance (Ce+Ci) needed at each TOSC pin can be calculated by using:
where:
Crystals specifying load capacitance (CL) higher than 6 pF, require external capacitors applied
as described in
The Low-frequency Crystal Oscillator must be selected by setting the CKSEL Fuses to “0110” or
“0111”, as shown in
shown in
Table 8-9.
C
ATmega48A/48PA/88A/88PA/168A/168PA/328/328
ATmega48A/48PA/88A/88P
A/168A/168PA/328/328P
=
SUT1...0
– Ce - is optional external capacitors as described in
– Ci - is the pin capacitance in
– CL - is the load capacitance for a 32.768 kHz crystal specified by the crystal vendor
– CS - is the total stray capacitance for one TOSC pin.
2 CL
00
1. Maximum ESR is typical value based on characterization
Table
Device
C
s
Maximum ESR Recommendation for 32.768 kHz Crystal
Capacitance for Low-frequency Oscillator
Start-up Times for the Low-frequency Crystal Oscillator Clock Selection
Additional Delay from Reset (V
Figure 8-2 on page
8-9.
Crystal CL (pF)
Table 8-10 on page
12.5
6.5
9.0
32kHz Osc. Type
4 CK
System Osc.
Timer Osc.
Table 8-8
29.
33. Start-up times are determined by the SUT Fuses as
CC
= 5.0V)
Table 8-7
Cap(Xtal1/Tosc1)
Recommended Usage
Fast rising power or BOD enabled
Figure 8-2 on page 29
18pF
18pF
for maximum ESR recommenda-
Max ESR [kΩ]
75
65
30
Cap(Xtal2/Tosc2)
(1)
8pF
8pF
Table 8-8
32
at

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