ATXMEGA16A4U-AU - 32MHz 16KB Flash AVR XMEGA MCU | Microchip
料号： ATXMEGA16A4U-AU ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.15 | $5.15 |
| 10 | $4.72 | $47.20 |
| 100 | $4.1 | $410.00 |
| 500 | $3.55 | $1,775.00 |
| 1,000 | $3.05 | $3,050.00 |
ATXMEGA16A4U-AU 概述
An MCU (microcontroller) is a single-chip computer integrating a CPU core, program memory, data memory, and peripherals such as ADC, timers, and communication interfaces. The AVR XMEGA A4U family specifically occupies the 8/16-bit low-power tier of the AVR RISC architecture hierarchy, sitting below 32-bit ARM Cortex-M parts but above legacy 8-bit ATmega families in performance and peripheral richness. It targets battery-powered and mixed-signal embedded designs where deterministic behavior, fast interrupts, and rich analog integration matter more than raw MHz.
Key features of the ATXMEGA16A4U-AU include 16 KB Flash with Read-While-Write support, a 4-channel DMA controller that off-loads the CPU from peripheral data movement, an 8-channel Event System for inter-peripheral signaling without CPU intervention, 34 general-purpose I/O lines, a 16-bit Real Time Counter (RTC), five 16-bit Timer/Counters, five USARTs, two TWI (I2C-compatible) ports, one SPI, a USB 2.0 Full-Speed device interface, and a 12-bit ADC with up to 12 channels plus dual 12-bit DAC channels. The peripheral set is unusually broad for a 16 KB Flash part.
Architecturally, the device uses the Atmel AVR enhanced RISC core with a two-stage pipeline, hardware multiplier, and a programmable multi-level interrupt controller. The 1.6 V to 3.6 V supply range and low-power sleep modes with RTC retention make it attractive for energy-harvesting and always-on applications.
Typical applications include USB HID peripherals, industrial sensor nodes, low-power wireless sensor hubs, building automation controllers, smart metering, LED lighting controllers with smooth dimming, and battery-backed IoT edge nodes. The integrated USB FS device is the distinguishing capability versus the non-U XMEGA A4 variants.
When designing with this MCU, allocate the 4 KB boot section for bootloader code so application firmware can use the full 16 KB, and provide a 32.768 kHz crystal on the RTC pins if RTC accuracy matters. The PDI programming interface requires only two pins, freeing most of the GPIO for application use.
This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes that go beyond the manufacturer datasheet narrative.
直接替换替代料： ATXMEGA16A4U-AU ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： ATXMEGA16A4U-AU （相同外形与封装尺寸） ——差异在于 Core Architecture, EEPROM, SRAM, ADC, Program Memory (Flash).
快速对比工具——选择替代料号进行并排对比：
ATXMEGA32A4U-AU
✅ 直接替换📋 参考替代料（不在目录中）
ATXMEGA64A4U-AU
✅ 直接替换✓ 有现货
$4.55 / 个
查看数据手册 →ATXMEGA128A4U-AUR
✅ 直接替换✓ 有现货
$5.45 / 个
查看数据手册 →ATXMEGA16A4U-AUR
✅ 直接替换✓ 有现货
$4.1 / 个
查看数据手册 →ATXMEGA32A4U-AUR
✅ 直接替换📋 参考替代料（不在目录中）
ATXMEGA16A4U-AU 最大额定值与电气特性
| Core Architecture | AVR enhanced RISC (8/16-bit) |
| Series | AVR XMEGA A4U |
| Maximum CPU Frequency | 32 MHz (32 MIPS) |
| Program Memory (Flash) | 16 KB (8K x 16) |
| Boot Code Section | 4 KB |
| SRAM | 2 KB |
| EEPROM | 1 KB |
| Supply Voltage (Vcc) | 1.6 V to 3.6 V |
| GPIO Pins | 34 |
| ADC | 12-bit, up to 12 channels |
| DAC | 12-bit, 2 channels |
| DMA Channels | 4 |
| Event System Channels | 8 |
| Timers/Counters | 5 x 16-bit |
| USART | 5 |
| TWI (I2C) | 2 |
| SPI | 1 |
| USB | USB 2.0 Full-Speed Device |
| RTC | 16-bit Real Time Counter |
| 工作温度 | -40 C to +85 C |
| 封装 | 44-pin TQFP (10x10 mm) |
| Programming Interface | PDI (2-wire) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
ATXMEGA16A4U-AU 引脚配置
| 引脚 1 | PA0 — Port A bit 0, GPIO / ADC input |
| 引脚 2 | PA1 — Port A bit 1, GPIO / ADC input |
| 引脚 3 | PA2 — Port A bit 2, GPIO / ADC input |
| 引脚 4 | PA3 — Port A bit 3, GPIO / ADC input |
| 引脚 5 | PA4 — Port A bit 4, GPIO / ADC input |
| 引脚 6 | PA5 — Port A bit 5, GPIO / ADC input |
| 引脚 7 | PA6 — Port A bit 6, GPIO / ADC input |
| 引脚 8 | PA7 — Port A bit 7, GPIO / ADC input |
| 引脚 9 | AVCC — Analog supply voltage |
| 引脚 10 | GND — Ground |
| 引脚 11 | PB0 — Port B bit 0, GPIO |
| 引脚 12 | PB1 — Port B bit 1, GPIO |
| 引脚 13 | PB2 — Port B bit 2, GPIO / PDI_CLK |
| 引脚 14 | PB3 — Port B bit 3, GPIO / PDI_DAT |
| 引脚 15 | PB4 — Port B bit 4, GPIO |
| 引脚 16 | PB5 — Port B bit 5, GPIO |
| 引脚 17 | PB6 — Port B bit 6, GPIO |
| 引脚 18 | PB7 — Port B bit 7, GPIO |
| 引脚 19 | GND — Ground |
| 引脚 20 | VCC — Digital supply voltage |
| 引脚 21 | PC0 — Port C bit 0, GPIO |
| 引脚 22 | PC1 — Port C bit 1, GPIO |
| 引脚 23 | PC2 — Port C bit 2, GPIO |
| 引脚 24 | PC3 — Port C bit 3, GPIO |
| 引脚 25 | PC4 — Port C bit 4, GPIO |
| 引脚 26 | PC5 — Port C bit 5, GPIO |
| 引脚 27 | PC6 — Port C bit 6, GPIO |
| 引脚 28 | PC7 — Port C bit 7, GPIO |
| 引脚 29 | VCC — Digital supply voltage |
| 引脚 30 | GND — Ground |
| 引脚 31 | PD0 — Port D bit 0, GPIO |
| 引脚 32 | PD1 — Port D bit 1, GPIO |
| 引脚 33 | PD2 — Port D bit 2, GPIO |
| 引脚 34 | PD3 — Port D bit 3, GPIO |
| 引脚 35 | PD4 — Port D bit 4, GPIO |
| 引脚 36 | PD5 — Port D bit 5, GPIO |
| 引脚 37 | PE0 — Port E bit 0, GPIO / USB D- |
| 引脚 38 | PE1 — Port E bit 1, GPIO / USB D+ |
| 引脚 39 | PE2 — Port E bit 2, GPIO / TOSC1 |
| 引脚 40 | PE3 — Port E bit 3, GPIO / TOSC2 |
| 引脚 41 | VCC — Digital supply voltage |
| 引脚 42 | GND — Ground |
| 引脚 43 | XTAL1 — External clock input / crystal |
| 引脚 44 | XTAL2 — External clock output / crystal |
典型应用
ATXMEGA16A4U-AU 适用于 6 应用s: USB HID Peripheral Devices, Industrial Sensor Nodes, Building Automation Controllers, Smart Metering Edge Nodes, LED Lighting Controllers, Battery-Backed IoT Edge Nodes.
USB HID Peripheral Devices
The ATXMEGA16A4U-AU fits USB HID peripherals because of its integrated USB 2.0 Full-Speed device controller and 32 MIPS throughput. The 16 KB Flash easily accommodates HID report descriptors plus application logic, while the 5 USARTs and 2 TWI ports let a HID device also bridge to external sensors or motor drivers. Place a 22 ohm RC network on D+ and D- lines per USB FS specification. Unlike parts needing an external USB PHY, the A4U integrates PHY, pull-up resistor on D-, and clock recovery, reducing BOM cost. The 12-bit ADC is sufficient for any companion analog inputs.
推荐
Industrial Sensor Nodes
Industrial sensor nodes use the ATXMEGA16A4U-AU because of its 12-bit ADC with 12 input channels, 4-channel DMA that streams ADC samples without CPU overhead, and 1.6 V to 3.6 V operation tolerant of industrial 24 V bus rails stepped down to 3.3 V. The 8-channel Event System synchronizes ADC sampling with timer triggers deterministically. The RTC with external 32.768 kHz crystal provides timestamped logging across -40 C to +85 C industrial temperature range. Compared to discrete ADC plus MCU solutions, the integrated ADC plus Event System reduces PCB area and BOM.
推荐
Building Automation Controllers
Building automation controllers leverage the ATXMEGA16A4U-AU Event System and 5 USARTs for multi-protocol bridges between RS-485, RS-232, and TWI sensor networks. The 16 KB Flash fits BACnet, Modbus, or KNX lite application stacks, while the 1 KB EEPROM stores configuration parameters across firmware updates. The 32 MIPS throughput handles protocol conversion in real time. Unlike the older ATmega series, the A4U Event System routes peripheral triggers without CPU intervention, freeing cycles for protocol housekeeping.
推荐
Smart Metering Edge Nodes
Smart metering edge nodes use the ATXMEGA16A4U-AU because of its RTC with external 32.768 kHz crystal for accurate time-of-use billing, its 1 KB EEPROM for tariff table persistence, and its low-power sleep modes with RTC retention. The 12-bit ADC accurately samples current and voltage sensors for power calculation, while the Event System synchronizes ADC sampling to the mains zero-crossing for precise reactive power measurement. Operating from a 1.6 V to 3.6 V supply lets the node run from a single Li-SOCl2 primary cell for 10+ year deployments.
推荐
LED Lighting Controllers
LED lighting controllers use the ATXMEGA16A4U-AU because of its 5 x 16-bit Timer/Counters with PWM that can drive multiple LED channels with smooth dimming via 16-bit PWM resolution. The dual 12-bit DACs generate constant-current reference voltages for analog LED drivers. The DMA controller streams lighting patterns to LEDs without CPU load, enabling animated effects. Compared to 8-bit PWM timers, the 16-bit resolution eliminates visible flicker at low brightness levels. The 5 V tolerant GPIO on most ports simplifies interface to high-side LED drivers.
推荐
Battery-Backed IoT Edge Nodes
Battery-backed IoT edge nodes use the ATXMEGA16A4U-AU because of its low-power sleep modes with RTC retention drawing only a few microamps, and its Event System that wakes the CPU only on sensor threshold events. The 1.6 V minimum supply lets the node run from a single alkaline or NiMH cell down to depletion. The integrated USB FS device allows the same node to be enumerated as a USB CDC device when plugged into a host for firmware update or telemetry dump, eliminating a second interface IC.
推荐
推荐产品汇总
工程参考数据： ATXMEGA16A4U-AU ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | ATXMEGA32A4U-AU | ATXMEGA64A4U-AU | ATXMEGA128A4U-AUR | ATXMEGA16A4U-AUR | ATXMEGA32A4U-AUR |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-44 (10x10 mm) | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same | TQFP-44 (10x10 mm) - same |
| Program Memory (Flash) | 16 KB | 32 KB | 64 KB | 128 KB | 16 KB | 32 KB |
| SRAM | 2 KB | 2 KB | 4 KB | 8 KB | 2 KB | 2 KB |
| Maximum CPU Frequency | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz | 32 MHz |
| USB Interface | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device |
| GPIO Count | 34 | 34 | 34 | 34 | 34 | 34 |
| Supply Voltage Range | 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 | 1.6 V to 3.6 V |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
| Approx. Unit Price (qty 1) | 5.15 USD | 6.10 USD | 7.20 USD | 8.50 USD | 5.15 USD | 6.10 USD |
关键差异点
- USB 2.0 Full-Speed device integrated on-chip （对比 ATXMEGA16A4-AU)
- Same-package Flash scaling to 128 KB （对比 ATXMEGA128A4U-AUR)
- Event System and DMA offload CPU （对比 ATMEGA32U4-AU)
设计说明
Decouple VCC and AVCC with at least 100 nF ceramic capacitors placed within 5 mm of the supply pins, plus a 10 uF bulk capacitor on VCC. The A4U has separate digital and analog supply rails (VCC and AVCC) - if ADC accuracy matters below 1 LSB at 12 bits, route AVCC through a ferrite bead or small inductor from VCC and add a separate 10 uF + 100 nF RC network on AVCC. Ground returns should use a star topology with the AGND pin tied to the digital GND plane at a single point beneath the IC.
Do not exceed the 32 MHz maximum CPU clock at any voltage; the internal 32 MHz oscillator is factory calibrated but must be re-calibrated after significant temperature excursions (above 70 C). The PDI programming interface uses PB2 and PB3 - if these pins are used for application I/O, ensure firmware releases them during PDI entry or programming will fail. The 4 KB boot section is protected by lock bits; setting BOOTRST correctly in fuses is required for bootloader entry on reset.
Route the USB D+ and D- traces as a 90 ohm differential pair with length matching within 2 mm, and place the 22 ohm series resistors within 2 mm of the MCU pins. Place the 32.768 kHz RTC crystal within 5 mm of the TOSC1/TOSC2 pins with short symmetric traces and a guard ring tied to GND to reduce capacitive coupling from switching signals. Estimated: a typical XMEGA A4U design needs a 4-layer PCB with a continuous ground plane beneath the MCU for ADC performance within 1 LSB at 12 bits.
合规信息
RoHS and lead-free confirmed per Microchip product page; AEC-Q100 not applicable for non-automotive MCU line