ATMEGA329P-20MUR - 8-bit AVR MCU, 32KB Flash, 20MHz, 64-QFN | Microchip
N.º de pieza: ATMEGA329P-20MUR ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $8.42 | $8,42 |
| 10 | $7.58 | $75,80 |
| 100 | $6.74 | $674,00 |
| 500 | $6.05 | $3.025,00 |
| 1.000 | $5.4 | $5.400,00 |
ATMEGA329P-20MUR Descripción general
A microcontroller (MCU) is a single-chip computer containing a CPU core, program memory (Flash), working memory (SRAM), non-volatile data storage (EEPROM), and integrated peripherals such as timers, communication interfaces, and analog blocks. The AVR architecture used by the ATmega family is a Modified Harvard RISC design with single-cycle instruction execution, which simplifies deterministic timing for embedded control. AVR microcontrollers are widely used in industrial control, consumer electronics, automotive subsystems, IoT endpoints, and educational platforms because of their low power, predictable interrupt response, and rich toolchain support (GCC, Atmel Studio / Microchip Studio).
Key features of the ATMEGA329P-20MUR include its 20 MHz maximum CPU clock at 5V operation, picoPower technology for low-power applications, an LCD controller that directly drives segmented displays, JTAG debug support, and a 10-bit successive-approximation ADC. The device supports multiple sleep modes for battery-powered designs and operates over an industrial temperature range of -40C to +85C.
The ATmega329P uses a two-stage pipelined Harvard architecture with 32 general-purpose registers directly tied to the ALU, enabling single-cycle ALU operations. The 32 KB flash supports in-system programming (ISP) and read-while-write, which lets the firmware update one section while executing from another - a useful feature for bootloader designs and field-upgradable products.
Typical applications include industrial control panels with LCD readouts, home appliances with segmented display interfaces, white goods control boards, instrumentation, sensor hubs, and battery-powered metering. The integrated LCD controller and abundant GPIO make it well-suited for human-machine interface (HMI) applications where a numeric or alphanumeric LCD is needed without an external display driver IC.
When designing with this device, ensure that the 64-QFN exposed pad is soldered to a sufficient ground plane for thermal and electrical performance, and that decoupling capacitors (100 nF plus bulk) are placed close to the AVCC and VCC pins. The LCD segment pins share package balls with GPIO, so pin multiplexing must be considered early in PCB layout.
This page synthesizes distributor pricing, drop-in alternatives within the ATmega AVR family, application guidance, and practical design notes not found in a single manufacturer document.
Alternativas directas para ATMEGA329P-20MUR — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Variantes de esta serie
Modelos de la misma serie compatibles directamente con ATMEGA329P-20MUR (mismo factor de forma y huella) — difiere en Package, RoHS Status, ADC, LCD Controller, Supply Voltage (Vcc).
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATMEGA329A-MUR
✅ Sustitución directa✓ En stock
$3.61 / unidad
Ver hoja de datos →ATMEGA329P-20MU
✅ Sustitución directa✓ En stock
$4.78 / unidad
Ver hoja de datos →ATMEGA325PA-MUR
✅ Sustitución directa✓ En stock
$1.65 / unidad
Ver hoja de datos →ATMEGA325P-20MUR
✅ Sustitución directa✓ En stock
$2.86 / unidad
Ver hoja de datos →ATMEGA3290P-20AUR
✅ Sustitución directa✓ En stock
Consulte el precio
Ver hoja de datos →ATMEGA329P-20MUR Valores máximos y características eléctricas
| Core Architecture | 8-bit AVR RISC |
| Program Memory (Flash) | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Frequency | 20 MHz |
| Supply Voltage (Vcc) | 1.8 V to 5.5 V (5V operation at 20 MHz) |
| General-Purpose I/O | 54 |
| General-Purpose Registers | 32 |
| ADC | 10-bit successive approximation |
| Encapsulado | 64-QFN (9x9 mm) |
| Temperatura de funcionamiento | -40C to +85C (Industrial) |
| Tipo de montaje | Surface Mount |
| LCD Controller | Yes (integrated) |
| JTAG Interface | Yes |
| picoPower Technology | Yes |
| Estado RoHS | Compliant (Green) |
Configuración de pines de ATMEGA329P-20MUR
| Pin 1 | VCC — Digital supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | AVCC — Analog supply voltage |
| Pin 4 | AREF — ADC reference voltage |
| Pin 5 | PA0 — GPIO / ADC0 |
| Pin 6 | PA1 — GPIO / ADC1 |
| Pin 7 | PA2 — GPIO / ADC2 |
| Pin 8 | PA3 — GPIO / ADC3 |
| Pin 9 | PA4 — GPIO / ADC4 |
| Pin 10 | PA5 — GPIO / ADC5 |
| Pin 11 | PA6 — GPIO / ADC6 |
| Pin 12 | PA7 — GPIO / ADC7 |
| Pin 13 | PB0 — GPIO / SEG0 |
| Pin 14 | PB1 — GPIO / SEG1 |
| Pin 15 | PB2 — GPIO / OC1B / SEG2 |
| Pin 16 | PB3 — GPIO / OC1A / SEG3 |
| Pin 17 | PB4 — GPIO / SS / SEG4 |
| Pin 18 | PB5 — GPIO / SEG5 |
| Pin 19 | PB6 — GPIO / SEG6 |
| Pin 20 | PB7 — GPIO / SEG7 |
| Pin 21 | PC0 — GPIO / SEG8 |
| Pin 22 | PC1 — GPIO / SEG9 |
| Pin 23 | PC2 — GPIO / SEG10 |
| Pin 24 | PC3 — GPIO / SEG11 |
| Pin 25 | PC4 — GPIO / SEG12 |
| Pin 26 | PC5 — GPIO / SEG13 |
| Pin 27 | PC6 — GPIO / SEG14 |
| Pin 28 | PC7 — GPIO / SEG15 |
| Pin 29 | RESET — Reset input (active low) |
| Pin 30 | VCC — Digital supply voltage |
| Pin 31 | GND — Ground |
| Pin 32 | XTAL2 — Crystal oscillator output |
| Pin 33 | XTAL1 — Crystal oscillator input |
| Pin 34 | PD0 — GPIO / RXD |
| Pin 35 | PD1 — GPIO / TXD |
| Pin 36 | PD2 — GPIO / INT0 |
| Pin 37 | PD3 — GPIO / INT1 |
| Pin 38 | PD4 — GPIO / OC1B |
| Pin 39 | PD5 — GPIO / OC1A |
| Pin 40 | PD6 — GPIO / ICP1 |
| Pin 41 | PD7 — GPIO / OC2 |
| Pin 42 | PE0 — GPIO / COM0 / PDI |
| Pin 43 | PE1 — GPIO / COM1 / PDO |
| Pin 44 | PE2 — GPIO / COM2 |
| Pin 45 | PE3 — GPIO / COM3 |
| Pin 46 | PE4 — GPIO / COM4 |
| Pin 47 | PE5 — GPIO / COM5 |
| Pin 48 | PE6 — GPIO / COM6 |
| Pin 49 | PE7 — GPIO / COM7 |
| Pin 50 | PF0 — GPIO / SEG16 |
| Pin 51 | PF1 — GPIO / SEG17 |
| Pin 52 | PF2 — GPIO / SEG18 |
| Pin 53 | PF3 — GPIO / SEG19 |
| Pin 54 | PF4 — GPIO / SEG20 |
| Pin 55 | PF5 — GPIO / SEG21 |
| Pin 56 | PF6 — GPIO / SEG22 |
| Pin 57 | PF7 — GPIO / SEG23 |
| Pin 58 | PG0 — GPIO / SEG24 |
| Pin 59 | PG1 — GPIO / SEG25 |
| Pin 60 | PG2 — GPIO / SEG26 |
| Pin 61 | PG3 — GPIO / SEG27 |
| Pin 62 | PG4 — GPIO / SEG28 |
| Pin 63 | TDI — JTAG Test Data In |
| Pin 64 | EP — Exposed pad (connect to GND) |
Aplicaciones típicas
ATMEGA329P-20MUR es adecuado para 6 aplicacións: Industrial Control Panels with LCD, Home Appliance Control Boards, Battery-Powered Metering Devices, Human-Machine Interface (HMI) Modules, Sensor Hubs and Data Loggers, Educational and Prototyping Platforms.
Industrial Control Panels with LCD
The ATMEGA329P-20MUR fits industrial control panel designs because its integrated segmented LCD controller eliminates an external display driver, reducing BOM and PCB area. With 54 GPIO pins, the device can drive keypads, LEDs, relays, and sensors concurrently while the LCD peripheral handles real-time numeric readouts. The 20 MHz core and 32 KB flash comfortably run control loops with PID algorithms and HMI menu logic, and the 64-QFN 9x9 mm footprint fits within the typical 80 x 80 mm panel outline.
Recomendado
Home Appliance Control Boards
White goods such as washing machines, dishwashers, ovens, and microwaves benefit from the ATMEGA329P-20MUR's combination of segmented LCD, abundant GPIO, and picoPower efficiency. The integrated LCD controller directly drives 7-segment or icon displays for time, temperature, and status readouts. Its 1.8 V to 5.5 V supply range simplifies designs that share a single 5 V or 3.3 V rail, and the industrial temperature grade supports unheated appliance enclosures without derating.
Recomendado
Battery-Powered Metering Devices
The picoPower technology in the ATMEGA329P-20MUR makes it well-suited for battery-powered metering such as gas, water, or electricity meters that must run for years on a primary cell. The 32 KB flash stores calibration tables and accumulated usage data in EEPROM, while the LCD peripheral provides local readouts without external drivers. The multiple low-power sleep modes (idle, power-save, standby) combined with the 1.8 V minimum supply allow designs that operate from a single 3 V lithium coin cell.
Recomendado
Human-Machine Interface (HMI) Modules
HMI subsystems in industrial automation, building controls, and instrumentation benefit from the ATMEGA329P-20MUR's LCD controller plus 54 GPIO, which can simultaneously drive a segmented LCD, multiple pushbuttons, encoder inputs, and indicator LEDs. The 32 KB flash supports menu structures, multilingual strings, and graphical state machines. With JTAG debug support, firmware engineers can develop and validate HMI logic on the same chip used in production, reducing toolchain complexity.
Recomendado
Sensor Hubs and Data Loggers
The ATMEGA329P-20MUR can serve as a sensor hub or data logger for environmental, agricultural, or industrial monitoring. The 10-bit ADC interfaces with analog sensors (temperature, humidity, pressure transducers), and the 2 KB SRAM plus 1 KB EEPROM provide buffering for time-stamped readings. The 32 KB flash supports FAT-style logging tables or compressed sample storage. JTAG and ISP simplify field firmware updates over the same SPI pins used for external sensors.
Recomendado
Educational and Prototyping Platforms
The ATMEGA329P-20MUR's AVR architecture, generous GPIO, and JTAG debug interface make it suitable for university embedded courses and engineering prototypes. The 32 KB flash accommodates student projects that mix LCD output, ADC sampling, and serial communication. The same MCU is supported by open-source toolchains (avr-gcc, avrdude, Microchip Studio), so learners can transition from Arduino-style boards to bare-metal QFN designs without changing core.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATMEGA329P-20MUR — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATMEGA329A-MUR | ATMEGA329P-20MU | ATMEGA325PA-MUR | ATMEGA325P-20MUR | ATMEGA3290P-20AUR |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same | 64-QFN (9x9 mm) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Program Memory (Flash) | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum CPU Frequency | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Integrated LCD Controller | Yes (segmented) | Yes (segmented) | Yes (segmented) | Yes (segmented) | Yes (segmented) | Yes (TFT / color) |
| picoPower Low-Power Modes | Yes | No | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Diferenciadores clave
- Integrated segmented LCD controller eliminates external driver IC (frente a ATMEGA325P-20MUR)
- picoPower technology for battery-friendly sleep currents (frente a ATMEGA329A-MUR)
- Higher 20 MHz CPU clock at full 5V operation (frente a ATMEGA325PV-10MU)
Notas de diseño
Estimated: The ATMEGA329P-20MUR in the 64-QFN package has a typical theta_JA of approximately 30 C/W on a 4-layer JEDEC test board. At 20 MHz active mode drawing ~15 mA at 5V, dissipation is ~75 mW, yielding a junction rise of ~2.3C above ambient - well within the -40C to +85C industrial range. The exposed pad (EP) MUST be soldered to a continuous ground copper pour with thermal vias for production reliability.
Place a 100 nF decoupling capacitor as close as possible to each VCC and AVCC pin, plus a single 10 uF bulk capacitor near the package. The exposed pad requires a continuous copper plane with at least 4 thermal vias to the inner ground plane for heat sinking and electrical grounding. Route the analog AVCC trace away from digital switching signals to minimize ADC noise coupling.
The LCD segment pins (PB0-PB7, PC0-PC7, PF0-PF7, PG0-PG4) share package balls with GPIO functions, so the pin multiplexing must be configured before firmware brings up segments. Plan PCB layout to keep the LCD glass connector short and well away from switching power or digital clock traces. JTAG pins (TDI, TDO, TMS, TCK) should be accessible for in-circuit debugging on prototype boards.
Do not assume 20 MHz operation at voltages below 4.5 V - consult the speed-grade tables in the datasheet. The ISP programming pins (MOSI, MISO, SCK, RESET) must not be externally pulled low or driven by external circuitry during programming. For battery designs, use the picoBrown power-save mode (not idle mode) to achieve single-digit uA current.
Keep crystal traces short (under 5 mm) and surrounded by a ground guard ring for noise immunity. The ADC reference voltage (AREF) requires a low-impedance source; place a 100 nF + 10 nF capacitor pair on AREF. When using JTAG in noisy environments, add 10 kohm pull-ups on TMS and TDI to prevent spurious boundary-scan entry.
Información de cumplimiento
Green-compliant per Microchip product page (RoHS and lead-free). Not AEC-Q100 qualified - select ATmega automotive variants for vehicle applications. Industrial temperature range -40C to +85C.