ATMEGA329P-20AN Atmel, ATMEGA329P-20AN Datasheet - Page 8

• Manufacturer Part Number: ATMEGA329P-20AN
• Description: IC MCU AVR 32K 20MHZ 64TQFP
• Manufacturer: Atmel
• Series: AVR® ATmegar

Specifications of ATMEGA329P-20AN

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 20MHz
• Connectivity: SPI, UART/USART, USI
• Peripherals: Brown-out Detect/Reset, LCD, POR, PWM, WDT
• Number Of I /o: 54
• 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): 2.7 V ~ 5.5 V
• Data Converters: A/D 8x10b
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 64-TQFP, 64-VQFP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

2.3.12
2.3.13
2.3.14
2.3.15
2.3.16
2.3.17
8021GS–AVR–03/11
RESET
XTAL1
XTAL2
AVCC
AREF
LCDCAP
Reset input. A low level on this pin for longer than the minimum pulse length will generate a
reset, even if the clock is not running. The minimum pulse length is given in
Characteristics” on page
Input to the inverting Oscillator amplifier and input to the internal clock operating circuit.
Output from the inverting Oscillator amplifier.
AVCC is the supply voltage pin for Port F and the A/D Converter. It should be externally con-
nected to V
through a low-pass filter.
This is the analog reference pin for the A/D Converter.
An external capacitor (typical > 470nF) must be connected to the LCDCAP pin as shown in
ure
as a reservoir for LCD power (V
the time until V
23-2, if the LCD module is enabled and configured to use internal power. This capacitor acts
CC
, even if the ADC is not used. If the ADC is used, it should be connected to V
LCD
reaches its target value.
336. Shorter pulses are not guaranteed to generate a reset.
LCD
). A large capacitance reduces ripple on V
ATmega329P/3290P
”System and Reset
LCD
but increases
Fig-
CC
8