ATXMEGA64A3-AU - 64KB Flash AVR XMEGA A3 MCU 32MHz TQFP-64 | Microchip
MPN: ATXMEGA64A3-AU ✓ Hoạt độngATXMEGA64A3-AU Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho ATXMEGA64A3-AU — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với ATXMEGA64A3-AU (cùng hình factor và footprint) — khác nhau ở Package.
ATXMEGA128A3-AU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATXMEGA256A3-AU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATXMEGA64A3-MH
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATXMEGA128A3U-AU
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATXMEGA64A3-AUR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
ATXMEGA64A3-AU Tỷ lệ tối đa & tính chất điện
| 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 |
| Hộp | 64-TQFP (14x14 mm) |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
Cấu hình chân ATXMEGA64A3-AU
| Chân 1 | AVCC — Analog supply voltage |
| Chân 2 | AREF — ADC reference voltage |
| Chân 3 | PA0 — Port A bit 0 (ADC0 input) |
| Chân 4 | RESET — Reset input, active low |
| Chân 5 | PDI_CLK — Program and Debug Interface clock |
| Chân 6 | PDI_DATA — Program and Debug Interface data |
| Chân 7 | VDD — Digital supply voltage |
| Chân 8 | VDDCORE — Internal core voltage decoupling |
| Chân 9 | GND — Ground |
| Chân 10 | PA1 — Port A bit 1 (ADC1 input) |
| Chân 11 | PA2 — Port A bit 2 (ADC2 input) |
| Chân 12 | PA3 — Port A bit 3 (ADC3 input) |
| Chân 13 | PA4 — Port A bit 4 (ADC4 input) |
| Chân 14 | PA5 — Port A bit 5 (ADC5 input) |
| Chân 15 | PA6 — Port A bit 6 (ADC6 input) |
| Chân 16 | PA7 — Port A bit 7 (ADC7 input) |
| Chân 17 | GND — Ground |
| Chân 18 | AVCC — Analog supply voltage |
| Chân 19 | PB0 — Port B bit 0 |
| Chân 20 | PB1 — Port B bit 1 |
| Chân 21 | PB2 — Port B bit 2 |
| Chân 22 | PB3 — Port B bit 3 |
| Chân 23 | PB4 — Port B bit 4 |
| Chân 24 | PB5 — Port B bit 5 |
| Chân 25 | PB6 — Port B bit 6 |
| Chân 26 | PB7 — Port B bit 7 |
| Chân 27 | GND — Ground |
| Chân 28 | VDD — Digital supply voltage |
| Chân 29 | PC0 — Port C bit 0 |
| Chân 30 | PC1 — Port C bit 1 |
| Chân 31 | PC2 — Port C bit 2 |
| Chân 32 | PC3 — Port C bit 3 |
| Chân 33 | PC4 — Port C bit 4 |
| Chân 34 | PC5 — Port C bit 5 |
| Chân 35 | PC6 — Port C bit 6 |
| Chân 36 | PC7 — Port C bit 7 |
| Chân 37 | PD0 — Port D bit 0 |
| Chân 38 | PD1 — Port D bit 1 |
| Chân 39 | PD2 — Port D bit 2 |
| Chân 40 | PD3 — Port D bit 3 |
| Chân 41 | PD4 — Port D bit 4 |
| Chân 42 | PD5 — Port D bit 5 |
| Chân 43 | PD6 — Port D bit 6 |
| Chân 44 | PD7 — Port D bit 7 |
| Chân 45 | PE0 — Port E bit 0 |
| Chân 46 | PE1 — Port E bit 1 |
| Chân 47 | PE2 — Port E bit 2 |
| Chân 48 | PE3 — Port E bit 3 |
| Chân 49 | PE4 — Port E bit 4 |
| Chân 50 | PE5 — Port E bit 5 |
| Chân 51 | GND — Ground |
| Chân 52 | VDD — Digital supply voltage |
| Chân 53 | VDDCORE — Internal core voltage decoupling |
| Chân 54 | GND — Ground |
| Chân 55 | PF0 — Port F bit 0 |
| Chân 56 | PF1 — Port F bit 1 |
| Chân 57 | PF2 — Port F bit 2 |
| Chân 58 | PF3 — Port F bit 3 |
| Chân 59 | PF4 — Port F bit 4 |
| Chân 60 | PF5 — Port F bit 5 |
| Chân 61 | PF6 — Port F bit 6 |
| Chân 62 | PF7 — Port F bit 7 |
| Chân 63 | PR0 — Port R bit 0 (XOSC) |
| Chân 64 | PR1 — Port R bit 1 (XOSC) |
Ứng dụng tiêu biểu
ATXMEGA64A3-AU phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATXMEGA64A3-AU — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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) |
Bảo phân biệt quan trọng
- Deterministic event-driven peripherals without CPU wake-up (vsATMEGA328P-AUR)
- Four-channel DMA controller with double buffering (vsATMEGA32U4-AU)
- Read-While-Write self-programmable Flash with 4 KB boot section (vsATMEGA4809-AUR)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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.
