ATMEGA329P-20MU - 8-bit AVR MCU, 32KB Flash, 20MHz | Microchip
Référence : ATMEGA329P-20MU ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $7.85 | $7,85 |
| 10 | $7.05 | $70,50 |
| 100 | $6.15 | $615,00 |
| 500 | $5.42 | $2 710,00 |
| 1 000 | $4.78 | $4 780,00 |
ATMEGA329P-20MU Présentation
An 8-bit microcontroller (MCU) is a single-chip computer that integrates a CPU core, program memory, data memory, I/O peripherals, and timers onto one die, executing instructions fetched from on-chip Flash. Within the broader taxonomy, the ATMEGA329P belongs to the AVR family of RISC microcontrollers, itself a subset of the picoPower low-power MCU category, which sits under the embedded computing / power-managed semiconductor hierarchy. The AVR core uses a Harvard-style architecture with separate program and data buses and a large register file of 32 general-purpose working registers directly tied to the ALU, enabling most instructions to complete in a single clock cycle.
Key features that differentiate the ATMEGA329P-20MU include 131 powerful instructions (most single-cycle execution), a hardware multiplier, two 8-bit timer/counters plus two 16-bit timer/counters with PWM, 8-channel 10-bit ADC, a USART, SPI and TWI (I2C-compatible) peripherals, an integrated LCD controller capable of driving segment displays up to 4 common and 32 segment lines, and a 4-channel PWM with programmable dead-time generators. Six sleep modes (Idle, Power-down, Power-save, Standby, Extended Standby, and ADC Noise Reduction) plus the picoPower 0.1uA real-time-clock operation make it attractive for battery-backed applications.
Architecturally, the ATMEGA329P-20MU adds the 'P' picoPower enhancements on top of the legacy ATmega329 die, lowering active current and supporting ultra-low-power RTC backup. The QFN-64 (MLF) package with exposed pad gives a low theta-JA for thermal dissipation and a small PCB footprint. It is pin-compatible with the ATmega169/329 family and shares the same peripheral mix for migration paths.
Typical applications include industrial control panels with integrated LCD segment displays, battery-powered metering and instrumentation, white-goods HMI, e-bike dashboards, medical handheld terminals, and remote sensor readout heads. The combination of LCD controller and picoPower sleep modes suits mains-line or battery-driven user-interface products. For designs requiring graphical TFT instead of segment LCD, consider the ATmega3290P or an external display controller.
When designing with this part, observe that '20MU' denotes the 20MHz speed grade at 5V operation; at lower Vcc the maximum clock must be derated per the datasheet DC characteristics. Place decoupling capacitors as close as possible to each VCC/GND pair and ensure the exposed pad is soldered to a sufficient ground copper pour for both thermal and electrical performance.
This page synthesizes distributor pricing as of 2026-09-17, drop-in same-package alternatives drawn from the same ATmega329/325 QFN-64 family, and practical design notes not aggregated on any single distributor product page.
Alternatives de remplacement direct pour ATMEGA329P-20MU — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec ATMEGA329P-20MU (même facteur de forme et même empreinte) — différant par Package, ADC, RoHS Status, Core Architecture, Supply Voltage (Vcc).
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
ATMEGA325P-20MU
✅ Remplacement direct✓ En stock
$2.21 / unité
Voir la fiche technique →ATMEGA325PA-MUR
✅ Remplacement direct✓ En stock
$1.65 / unité
Voir la fiche technique →ATMEGA329P-20AU
✅ Remplacement direct✓ En stock
$4.71 / unité
Voir la fiche technique →ATMEGA329P-20MUR
✅ Remplacement direct✓ En stock
$5.4 / unité
Voir la fiche technique →ATMEGA329P-20MU Valeurs maximales et caractéristiques électriques
| Core | 8-bit AVR RISC |
| Flash Program Memory | 32 KB (16K x 16) |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Maximum CPU Clock | 20 MHz |
| Supply Voltage (Vcc) | 2.7 V to 5.5 V |
| General-Purpose I/O Pins | 54 |
| Boîtier | 64-QFN / MLF (9 x 9 mm) with exposed pad |
| Type de montage | Surface Mount |
| ADC | 8-channel, 10-bit |
| Timer/Counters | Two 8-bit + Two 16-bit with PWM |
| PWM Channels | 6 channels |
| Communication Interfaces | USART, SPI, TWI (I2C-compatible) |
| LCD Controller | Up to 4x32 segment driver (integrated) |
| On-chip Debug | JTAG |
| Plage de température de fonctionnement | -40C to +85C (Industrial) |
| Instruction Set | 131 instructions, mostly single-cycle |
| Working Registers | 32 x 8-bit |
| Watchdog Timer | Yes, programmable |
| Brown-out Detector | Yes |
| Sleep Modes | 6 (Idle, Power-down, Power-save, Standby, Ext Standby, ADC Noise Reduction) |
| Niveau MSL | 3 (168 hours) |
| Statut RoHS | Compliant (Green) |
Configuration des broches de ATMEGA329P-20MU
| Broche 1 | VCC — Digital supply voltage |
| Broche 2 | GND — Ground |
| Broche 3 | PORTA0 — Port A bit 0 (digital I/O / ADC0) |
| Broche 4 | PORTA1 — Port A bit 1 (digital I/O / ADC1) |
| Broche 5 | PORTA2 — Port A bit 2 (digital I/O / ADC2) |
| Broche 6 | PORTA3 — Port A bit 3 (digital I/O / ADC3) |
| Broche 7 | PORTA4 — Port A bit 4 (digital I/O / ADC4) |
| Broche 8 | PORTA5 — Port A bit 5 (digital I/O / ADC5) |
| Broche 9 | PORTA6 — Port A bit 6 (digital I/O / ADC6) |
| Broche 10 | PORTA7 — Port A bit 7 (digital I/O / ADC7) |
| Broche 11 | AVCC — Analog supply voltage |
| Broche 12 | AREF — Analog reference voltage |
| Broche 13 | GND — Ground (analog) |
| Broche 14 | PORTB0 — Port B bit 0 (digital I/O) |
| Broche 15 | PORTB1 — Port B bit 1 (digital I/O) |
| Broche 16 | PORTB2 — Port B bit 2 (SS/OC1B) |
| Broche 17 | PORTB3 — Port B bit 3 (MOSI/OC1A) |
| Broche 18 | PORTB4 — Port B bit 4 (MISO) |
| Broche 19 | PORTB5 — Port B bit 5 (SCK) |
| Broche 20 | PORTB6 — Port B bit 6 (OC2B/PCINT6) |
| Broche 21 | PORTB7 — Port B bit 7 (OC2A/PCINT7) |
| Broche 22 | PORTC0 — Port C bit 0 (LCD SEG0) |
| Broche 23 | PORTC1 — Port C bit 1 (LCD SEG1) |
| Broche 24 | PORTC2 — Port C bit 2 (LCD SEG2) |
| Broche 25 | PORTC3 — Port C bit 3 (LCD SEG3) |
| Broche 26 | PORTC4 — Port C bit 4 (LCD SEG4) |
| Broche 27 | PORTC5 — Port C bit 5 (LCD SEG5) |
| Broche 28 | PORTC6 — Port C bit 6 (LCD SEG6) |
| Broche 29 | PORTC7 — Port C bit 7 (LCD SEG7) |
| Broche 30 | RESET — Reset input (active low) |
| Broche 31 | VCC — Digital supply voltage |
| Broche 32 | GND — Ground |
| Broche 33 | XTAL2 — Crystal oscillator output |
| Broche 34 | XTAL1 — Crystal oscillator input |
| Broche 35 | PORTD0 — Port D bit 0 (RXD/INT0) |
| Broche 36 | PORTD1 — Port D bit 1 (TXD/INT1) |
| Broche 37 | PORTD2 — Port D bit 2 (INT2) |
| Broche 38 | PORTD3 — Port D bit 3 (INT3) |
| Broche 39 | PORTD4 — Port D bit 4 (OC1B) |
| Broche 40 | PORTD5 — Port D bit 5 (OC1A) |
| Broche 41 | PORTD6 — Port D bit 6 (OC2B/ICP) |
| Broche 42 | PORTD7 — Port D bit 7 (OC2A) |
| Broche 43 | PORTE0 — Port E bit 0 (RXD0/PCINT8) |
| Broche 44 | PORTE1 — Port E bit 1 (TXD0) |
| Broche 45 | PORTE2 — Port E bit 2 (XCK0/AIN0) |
| Broche 46 | PORTE3 — Port E bit 3 (OC3A/AIN1) |
| Broche 47 | PORTE4 — Port E bit 4 (OC3B/INT4) |
| Broche 48 | PORTE5 — Port E bit 5 (OC3C/INT5) |
| Broche 49 | PORTE6 — Port E bit 6 (TOSC1) |
| Broche 50 | PORTE7 — Port E bit 7 (TOSC2) |
| Broche 51 | PORTF0 — Port F bit 0 (ADC0/TDI) |
| Broche 52 | PORTF1 — Port F bit 1 (ADC1/TDO) |
| Broche 53 | PORTF2 — Port F bit 2 (ADC2/TMS) |
| Broche 54 | PORTF3 — Port F bit 3 (ADC3/TCK) |
| Broche 55 | PORTF4 — Port F bit 4 (ADC4) |
| Broche 56 | PORTF5 — Port F bit 5 (ADC5) |
| Broche 57 | PORTF6 — Port F bit 6 (ADC6) |
| Broche 58 | PORTF7 — Port F bit 7 (ADC7) |
| Broche 59 | PORTG0 — Port G bit 0 (WR) |
| Broche 60 | PORTG1 — Port G bit 1 (RD) |
| Broche 61 | PORTG2 — Port G bit 2 (ALE) |
| Broche 62 | PORTG3 — Port G bit 3 |
| Broche 63 | PORTG4 — Port G bit 4 (TOSC1 alt) |
| Broche 64 | PORTG5 — Port G bit 5 (OC0B) |
Applications typiques
ATMEGA329P-20MU convient pour 6 applications: Industrial Metering & Sub-metering with Segment LCD, Battery-Powered Sensor / Data Logger Heads, White Goods / Appliance HMI Panels, E-Bike / Scooter Dashboard & Battery Display, Medical Handheld / Point-of-Care Devices, Industrial Control Panels with Segment Display.
Industrial Metering & Sub-metering with Segment LCD
The ATMEGA329P-20MU's integrated 4x32 segment LCD controller eliminates the need for an external driver IC in electricity, water, gas, or heat meters. Its 32KB Flash holds metering firmware plus IEC 62056-21 / DLMS protocol stacks, and 2KB SRAM handles measurement buffers. The picoPower active current (~1mA per MHz at 3.3V) plus 0.1uA RTC backup enables battery-augmented designs for retrofit meters. Place the QFN-64 exposed pad over a generous ground copper pour for thermal stability during 24/7 operation.
Recommandé
Battery-Powered Sensor / Data Logger Heads
With six software-selectable sleep modes drawing as little as 0.1uA in Power-save with RTC running, the ATMEGA329P-20MU is ideal for remote sensor heads that wake periodically, sample, log to EEPROM, and return to sleep. The 8-channel 10-bit ADC reads sensor voltages directly; the on-chip bandgap reference simplifies ratiometric measurements. Battery life of multiple years is achievable when duty-cycling the ADC and USART. The QFN-64 9x9mm footprint suits small enclosures.
Recommandé
White Goods / Appliance HMI Panels
Washing machines, ovens, dishwashers, and microwaves use the ATMEGA329P-20MU to drive a 4-digit segment display, read capacitive or resistive touch buttons, control relays via GPIO, and communicate with the main appliance controller over UART. The 20MHz clock handles real-time UI updates without perceptible lag, while the integrated LCD driver reduces BOM cost compared to designs using an external HT1621. Industrial -40 to +85C operation handles under-counter or garage environments.
Recommandé
E-Bike / Scooter Dashboard & Battery Display
The ATMEGA329P-20MU drives a segment-LCD speed, battery, and trip display, reads wheel-reed pulses and throttle position via ADC, and updates the user in real time. Its 2.7V minimum operating voltage is well-suited for 1S Li-ion packs with onboard 3.3V regulators. Six PWM channels drive indicator LEDs or control a buzzer. JTAG debug enables rapid firmware iteration during product development.
Recommandé
Medical Handheld / Point-of-Care Devices
Handheld glucose meters, INR readers, and pulse-oximeter displays benefit from the ATMEGA329P-20MU's combination of segment-LCD controller, picoPower sleep, and industrial temperature range. The 32KB Flash holds the measurement algorithm plus a full alphanumeric UI state machine. 1KB EEPROM retains calibration constants across battery swaps. SPI/TWI interfaces connect to external ADC, EEPROM, or Bluetooth modules. QFN-64 keeps the PCB small enough to fit a pen-style housing.
Recommandé
Industrial Control Panels with Segment Display
Control panels for HVAC, pumps, motor starters, and building automation use the ATMEGA329P-20MU to display operating state on a segment LCD, scan keypads, drive relays or triacs via GPIO and PWM, and report telemetry over RS-485 / Modbus via the on-chip USART. The 20MHz core handles background polling of inputs while servicing the LCD controller via DMA-free polled updates. Wide 2.7V to 5.5V supply range simplifies designs that tap 3.3V or 5V rails.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ATMEGA329P-20MU — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ATMEGA325P-20MU | ATMEGA325PA-MU | ATMEGA329P-20AU | ATMEGA329P-20MUR |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-QFN (MLF) 9x9mm | 64-QFN (MLF) 9x9mm - same | 64-QFN (MLF) 9x9mm - same | 64-TQFP 14x14mm - different footprint | 64-QFN (MLF) 9x9mm - same |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 2 KB | 2 KB | 2 KB |
| EEPROM | 1 KB | 1 KB | 1 KB | 1 KB | 1 KB |
| Maximum Clock | 20 MHz | 20 MHz | 20 MHz | 20 MHz | 20 MHz |
| Integrated LCD Controller | Yes (4x32 segments) | No | No | Yes (4x32 segments) | Yes (4x32 segments) |
| picoPower Low-Power Features | Yes | No | Yes | Yes | Yes |
| Operating Voltage | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V | 2.7V to 5.5V |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
Principaux différenciateurs
- Integrated 4x32 segment LCD controller with no external driver IC required (vs ATMEGA325P-20MU)
- picoPower low-power architecture with 6 sleep modes and 0.1uA RTC backup (vs ATMEGA325P-20MU)
- QFN-64 9x9mm package footprint for compact, thermally-efficient layouts (vs ATMEGA329P-20AU (TQFP-64))
- On-chip JTAG debug and boundary-scan for production test (vs ATMEGA328P-MU (32-pin QFN))
Notes de conception
Place a 100nF decoupling capacitor as close as possible to each VCC pin pair (pins 1 and 31), plus a 10uF bulk capacitor on the AVCC pin (pin 11). The QFN-64 exposed thermal pad MUST be soldered to a continuous ground copper pour with at least 8 thermal vias to the inner ground plane for both thermal dissipation and electrical grounding. Failing to solder the EP will result in excessive junction temperature and erratic analog ADC readings.
The '20' speed grade guarantees 20MHz operation only at 4.5V to 5.5V Vcc. Below 4.5V, the maximum clock frequency must be derated per the speed-grade tables in section 29 of the datasheet - for example at 2.7V the maximum is 10MHz. To use a low-tick 32.768kHz crystal on the TOSC1/TOSC2 pins (PE6/PE7) for RTC operation, configure the asynchronous timer correctly and select the appropriate fuse bits. Power-save mode with Timer2 running asynchronously can achieve 0.1uA typical RTC backup current.
Do not assume all 54 I/O pins are 5V-tolerant at 3.3V operation - any pin configured as an input has high-impedance and may need a pull-up. The JTAG pins (PF0-PF3) are multiplexed with the JTAG controller; disable JTAG via fuses if those pins are needed as standard GPIO in production. The LCD controller's segment pins (PC0-PC7 and PORTG) drive the glass directly - check segment load current limits in the datasheet LCD electrical characteristics when designing the display interface.
Informations de conformité
RoHS and Green compliant per Microchip product page (formerly Atmel). Not AEC-Q100 qualified - for automotive applications consult Microchip automotive-grade ATmega equivalents. Halogen-free and lead-free per ordering information.
