ATXMEGA64A3-AU - 64KB Flash AVR XMEGA A3 MCU 32MHz TQFP-64 | Microchip
N.º de pieza: ATXMEGA64A3-AU ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $11.13 | $11,13 |
| 10 | $10.45 | $104,50 |
| 100 | $9.12 | $912,00 |
| 500 | $7.95 | $3.975,00 |
| 1.000 | $6.82 | $6.820,00 |
ATXMEGA64A3-AU Descripción general
An AVR XMEGA microcontroller is a high-performance 8/16-bit RISC architecture that extends the classic AVR core with a wider instruction set, hardware multiplier, and rich on-chip peripherals. Within the broader taxonomy, the ATXMEGA64A3 belongs to the XMEGA A3 family, which is the general-purpose branch of the XMEGA line designed for low-power embedded control with deterministic interrupt handling and event-driven peripherals. The XMEGA core architecture (AVR -> 8-bit MCU -> microcontroller -> semiconductor) achieves 1 MIPS per MHz efficiency, so a 32 MHz clock produces 32 MIPS of compute, an attractive ratio for power-constrained designs.
Key features include 50 general-purpose I/O lines, seven 16-bit Timer/Counters with PWM and compare modes, seven USARTs, two two-wire interfaces (TWI/I2C), two SPI peripherals, a 12-bit ADC and 12-bit DAC, a four-channel DMA controller, and a cryptographic AES/DES engine. The self-programmable Flash supports Read-While-Write, allowing firmware updates without halting application code execution, while the on-chip boot section enables secure bootloader-based field upgrades.
The 64-pin TQFP (14x14 mm) is a mature surface-mount package with reliable manufacturability and good thermal performance for moderate-power designs. The 1.6 V minimum supply extends the part into single-cell Li-ion (nominally 3.7 V) and energy-harvesting applications, while the on-chip peripherals reduce external component count. The architecture's deterministic interrupt latency and peripheral event system make it particularly well suited to real-time control loops.
Typical applications include industrial sensor hubs, building automation controllers, smart metering nodes, USB device bridges, HMI panels with TFT drives, and low-power wireless sensor nodes. Designers typically select this part when they need deterministic event handling, generous on-chip peripherals, and the flexibility of a self-programmable Flash with bootloader support, all at low supply voltage.
When designing with this device, ensure that VDDCORE is properly decoupled and that PDI/PDO programming lines are accessible on the board for in-system programming. The XMEGA event system routes peripheral triggers without CPU intervention, so designers should map out event channels before committing to a final pinout. Peripherals not in use should be clock-gated via the PR register to minimize power draw in sleep modes.
This page synthesizes distributor pricing, drop-in XMEGA A3 alternatives, package-aware comparison, and design notes not found in the standalone manufacturer datasheet.
Alternativas directas para ATXMEGA64A3-AU — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
ATXMEGA128A3-AU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATXMEGA256A3-AU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATXMEGA64A3-MH
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATXMEGA128A3U-AU
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATXMEGA64A3-AUR
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
ATXMEGA64A3-AU Valores máximos y características eléctricas
| Core Architecture | AVR XMEGA (8/16-bit RISC) |
| Family | XMEGA A3 |
| Program Memory (Flash) | 64 KB (32K x 16) |
| Boot Code Section | 4 KB |
| Data SRAM | 4 KB |
| EEPROM | 2 KB |
| Maximum CPU Speed | 32 MHz (32 MIPS) |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| General-Purpose I/O Pins | 50 |
| Timer/Counters | 7 x 16-bit with PWM and compare modes |
| USART | 7 |
| SPI | 2 |
| TWI (I2C) | 2 |
| ADC | 12-bit |
| DAC | 12-bit |
| DMA Channels | 4 |
| Event System Channels | 8 |
| Real-Time Counter (RTC) | 16-bit |
| Encapsulado | 64-TQFP (14x14 mm) |
| Temperatura de funcionamiento | -40 C to +85 C (industrial) |
| Tipo de montaje | Surface Mount |
| Estado RoHS | Compliant |
Configuración de pines de ATXMEGA64A3-AU
| Pin 1 | AVCC — Analog supply voltage |
| Pin 2 | AREF — ADC reference voltage |
| Pin 3 | PA0 — Port A bit 0 (ADC0 input) |
| Pin 4 | RESET — Reset input, active low |
| Pin 5 | PDI_CLK — Program and Debug Interface clock |
| Pin 6 | PDI_DATA — Program and Debug Interface data |
| Pin 7 | VDD — Digital supply voltage |
| Pin 8 | VDDCORE — Internal core voltage decoupling |
| Pin 9 | GND — Ground |
| Pin 10 | PA1 — Port A bit 1 (ADC1 input) |
| Pin 11 | PA2 — Port A bit 2 (ADC2 input) |
| Pin 12 | PA3 — Port A bit 3 (ADC3 input) |
| Pin 13 | PA4 — Port A bit 4 (ADC4 input) |
| Pin 14 | PA5 — Port A bit 5 (ADC5 input) |
| Pin 15 | PA6 — Port A bit 6 (ADC6 input) |
| Pin 16 | PA7 — Port A bit 7 (ADC7 input) |
| Pin 17 | GND — Ground |
| Pin 18 | AVCC — Analog supply voltage |
| Pin 19 | PB0 — Port B bit 0 |
| Pin 20 | PB1 — Port B bit 1 |
| Pin 21 | PB2 — Port B bit 2 |
| Pin 22 | PB3 — Port B bit 3 |
| Pin 23 | PB4 — Port B bit 4 |
| Pin 24 | PB5 — Port B bit 5 |
| Pin 25 | PB6 — Port B bit 6 |
| Pin 26 | PB7 — Port B bit 7 |
| Pin 27 | GND — Ground |
| Pin 28 | VDD — Digital supply voltage |
| Pin 29 | PC0 — Port C bit 0 |
| Pin 30 | PC1 — Port C bit 1 |
| Pin 31 | PC2 — Port C bit 2 |
| Pin 32 | PC3 — Port C bit 3 |
| Pin 33 | PC4 — Port C bit 4 |
| Pin 34 | PC5 — Port C bit 5 |
| Pin 35 | PC6 — Port C bit 6 |
| Pin 36 | PC7 — Port C bit 7 |
| Pin 37 | PD0 — Port D bit 0 |
| Pin 38 | PD1 — Port D bit 1 |
| Pin 39 | PD2 — Port D bit 2 |
| Pin 40 | PD3 — Port D bit 3 |
| Pin 41 | PD4 — Port D bit 4 |
| Pin 42 | PD5 — Port D bit 5 |
| Pin 43 | PD6 — Port D bit 6 |
| Pin 44 | PD7 — Port D bit 7 |
| Pin 45 | PE0 — Port E bit 0 |
| Pin 46 | PE1 — Port E bit 1 |
| Pin 47 | PE2 — Port E bit 2 |
| Pin 48 | PE3 — Port E bit 3 |
| Pin 49 | PE4 — Port E bit 4 |
| Pin 50 | PE5 — Port E bit 5 |
| Pin 51 | GND — Ground |
| Pin 52 | VDD — Digital supply voltage |
| Pin 53 | VDDCORE — Internal core voltage decoupling |
| Pin 54 | GND — Ground |
| Pin 55 | PF0 — Port F bit 0 |
| Pin 56 | PF1 — Port F bit 1 |
| Pin 57 | PF2 — Port F bit 2 |
| Pin 58 | PF3 — Port F bit 3 |
| Pin 59 | PF4 — Port F bit 4 |
| Pin 60 | PF5 — Port F bit 5 |
| Pin 61 | PF6 — Port F bit 6 |
| Pin 62 | PF7 — Port F bit 7 |
| Pin 63 | PR0 — Port R bit 0 (XOSC) |
| Pin 64 | PR1 — Port R bit 1 (XOSC) |
Aplicaciones típicas
ATXMEGA64A3-AU es adecuado para 6 aplicacións: Industrial Sensor Hub Controller, Smart Metering and Energy Monitoring, USB Device Bridge and HID Interface, Building Automation and HVAC Controllers, Human-Machine Interface (HMI) Panels, Low-Power Wireless Sensor Node.
Industrial Sensor Hub Controller
The ATXMEGA64A3-AU fits industrial sensor hubs because its 7 USARTs, 2 SPI, and 2 TWI ports aggregate data from multiple sensor front-ends simultaneously, while the 4-channel DMA offloads ADC and UART transfers so the 32 MIPS core can run Modbus RTU or wireless baseband stacks. The 12-bit ADC with internal reference and 1.6-3.6 V supply enables direct connection to 4-20 mA loop-powered transmitters with active conditioning. The -40 C to +85 C industrial temperature grade and 64 KB Flash accommodate Over-the-Air bootloader payloads, and the event system routes ADC-complete and timer triggers without CPU wake-up, reducing sleep current below 1 uA in power-down mode for battery-backed installations.
Recomendado
Smart Metering and Energy Monitoring
The ATXMEGA64A3-AU is suitable for smart metering endpoints because its 16-bit RTC provides time-of-use tariff scheduling while the 12-bit ADC samples current and voltage at rates compatible with Class 1 revenue metering accuracy. The 32 MIPS throughput executes IEC 62056 DLMS/COSEM protocol stacks in firmware, and the 50 GPIO lines support multiple meter interfaces (optical port, M-Bus, wireless M-Bus). The 1.6 V minimum supply extends battery life on remote metering nodes, while the 7 USARTs handle simultaneous cellular and RF module connections. The 4 KB SRAM and 64 KB Flash accommodate DLMS object dictionaries and metering firmware with margin for future tariff updates.
Recomendado
USB Device Bridge and HID Interface
The ATXMEGA64A3-AU serves USB device bridges when paired with an external USB transceiver, using its 32 MIPS throughput to handle USB 1.1 Full-Speed protocol stacks via bit-banged or USART-in-DM-state firmware. The 64 KB Flash accommodates CDC, HID, and vendor-class composite descriptors, and the 4 KB SRAM handles control endpoint buffers plus HID report FIFOs. The 7 USARTs bridge to multiple downstream RS-232, RS-485, or TTL serial devices, while the DMA engine moves serial data to USB endpoints without CPU overhead. For designs needing native USB, migrating to the ATXMEGA128A3U-AU adds an integrated USB 2.0 Full-Speed controller on the same 64-TQFP footprint.
Recomendado
Building Automation and HVAC Controllers
The ATXMEGA64A3-AU supports building automation controllers because its 50 GPIO lines drive relays, triacs, and 0-10 V dimmer outputs for lighting and HVAC actuators, while the 7 16-bit Timer/Counters generate PWM signals for variable-speed fan and damper control. The event system synchronizes ADC sampling with zero-cross detection on the AC mains, eliminating CPU jitter in dimmer calculations. The 1.6-3.6 V supply tolerates brownouts from inductive loads, and the 32 MIPS throughput runs BACnet MS/TP or Modbus stacks alongside control loops. The 64 KB Flash stores BACnet object databases and schedule tables.
Recomendado
Human-Machine Interface (HMI) Panels
The ATXMEGA64A3-AU drives HMI panels with segmented LCDs or small TFT displays by using its 50 GPIO to bit-bang LCD segment drivers or to interface with external TFT controllers via SPI. The 4 KB SRAM provides display buffer headroom for 128x64 monochrome panels, while the 32 MIPS throughput renders text and icons without perceptible lag. The 7 USARTs connect to barcode scanners, NFC readers, and RS-485 fieldbus ports common in industrial HMI installations. Designers needing TFT support can migrate to the ATXMEGA128A1-AU which adds a parallel bus interface for higher-resolution displays on the same family architecture.
Recomendado
Low-Power Wireless Sensor Node
The ATXMEGA64A3-AU fits low-power wireless sensor nodes because its six software-selectable sleep modes drop below 1 uA in Power-Down with RTC running, while the 32 MHz active mode gives 32 MIPS for periodic sensor aggregation and transmit bursts. The 4-channel DMA handles SPI transfers to radios without CPU wake-up, and the event system triggers ADC sampling directly from timer compare events. The 1.6 V minimum supply operates from a single-cell Li-ion or two AA batteries, and the 64 KB Flash accommodates 6LoWPAN or BLE application-layer stacks with room for over-the-air firmware updates.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para ATXMEGA64A3-AU — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | ATXMEGA128A3-AU | ATXMEGA256A3-AU | ATXMEGA64A3-MH | ATXMEGA128A3U-AU |
|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-TQFP (14x14 mm) | 64-TQFP (14x14 mm) - same | 64-TQFP (14x14 mm) - same | 64-QFN (9x9 mm) - same die | 64-TQFP (14x14 mm) - same |
| Flash Memory | 64 KB | 128 KB | 256 KB | 64 KB | 128 KB |
| SRAM | 4 KB | 8 KB | 16 KB | 4 KB | 8 KB |
| EEPROM | 2 KB | 2 KB | 4 KB | 2 KB | 2 KB |
| Maximum Clock | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| Operating Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| GPIO Count | 50 | 50 | 50 | 50 | 50 |
| USB Controller | No (external required) | No | No | No | Yes (USB 2.0 FS) |
Diferenciadores clave
- Deterministic event-driven peripherals without CPU wake-up (frente a ATMEGA328P-AUR)
- Four-channel DMA controller with double buffering (frente a ATMEGA32U4-AU)
- Read-While-Write self-programmable Flash with 4 KB boot section (frente a ATMEGA4809-AUR)
Notas de diseño
Decouple VDD with a 100 nF X7R ceramic placed within 5 mm of pins 7/28/52, and add a 4.7 uF bulk capacitor on the same rail. VDDCORE (pins 8 and 53) requires its own 100 nF + 1 uF decoupling pair and must NOT be driven externally - the internal 1.8 V regulator generates this rail from VDD. AVCC and AREF need separate filtered decoupling (10 uH ferrite + 100 nF) to keep ADC noise below 1 LSB at 12-bit resolution. Reverse-polarity protection via a Schottky diode on VDD prevents field failures when batteries are installed backwards.
Route PDI_CLK and PDI_DATA traces together as a differential pair with matched length, keeping them short (<50 mm) and away from switching signals. Place the 32.768 kHz crystal within 5 mm of pins 63/64 with a guard ring tied to GND to reduce RTC jitter below 5 ppm. For USB applications, route D+/D- as a 90-ohm differential pair; for ADC accuracy, isolate analog traces (PA0-PA7, AREF) from digital switching nodes by at least 3x the trace-to-trace spacing. Keep the exposed pad of any QFN-variant pin-compatible part soldered to a continuous ground pour for thermal dissipation.
Do not enable the DMA controller before configuring the source and destination pointers and the transfer count - the XMEGA DMA does not zero-init its registers and a stale trigger can corrupt memory. When using Read-While-Write self-programming, the boot section must be at least 4 KB or the BLD instruction will trap. The 12-bit ADC's internal 1.0 V reference must be enabled via the REFCTRL register with adequate startup time (typically 40 us) before conversions begin, otherwise first samples read zero. Always issue the PR.PRGEN, PR.PRPA, etc. peripheral-sleep bits before entering Power-Down to minimize leakage.
Información de cumplimiento
RoHS and REACH compliant per Microchip product page. Industrial -40 C to +85 C temperature grade. Not AEC-Q100 qualified - this is an industrial-grade part; AEC-Q100 automotive variants are not available in the XMEGA A3 family.
