ATSAM3U4EA-AU - 96MHz Cortex-M3 MCU 256KB Flash | Microchip
MPN: ATSAM3U4EA-AU ✓ Hoạt độngATSAM3U4EA-AU Tóm tắt
A microcontroller (MCU) is a single-chip embedded processor that integrates a CPU core, program memory, data memory, and peripherals (UART, SPI, I2C, timers, USB, ADC) onto one die. In the embedded processing hierarchy, the SAM3U4E sits between entry-level Cortex-M0 MCUs and higher-performance Cortex-M4 parts, with Cortex-M3 being its 32-bit RISC core architecture. The Cortex-M3 revision 2.0 runs at up to 96 MHz, executes the Thumb-2 instruction set, and includes a Memory Protection Unit (MPU) for memory isolation and OS-style privilege separation. Hypernym chain: SAM3U4E -> SAM3U family -> ARM Cortex-M3 MCU -> 32-bit microcontroller -> embedded processor -> integrated circuit.
Key features include 256 KB of Flash accessed 128 bits wide through a memory accelerator that sustains near-zero wait-state execution from SRAM or Flash at full clock. The dual-bank architecture supports safe in-application programming (IAP) and firmware field updates without halting user code. A multi-layer AHB bus matrix, dedicated DMA channels, and Peripheral DMA Controllers (PDC) maximize concurrent peripheral throughput, while a high-speed USB 2.0 Full-Speed Device port with on-chip PHY targets USB data-acquisition designs.
The architecture sustains high-speed peripheral transfers by allowing parallel bus-matrix transactions between the Cortex-M3 core, SRAM banks, USB, and DMA engines. This makes the device well suited to USB data-acquisition dongles, industrial gateways, and test-instrument front ends where deterministic throughput matters more than raw compute.
Typical applications include USB data-acquisition modules, industrial control gateways, smart metering, point-of-sale terminals, and motor-control human-machine interface (HMI) panels. The 144-pin LQFP exposes up to four UART, three SPI, two I2C, USB, CAN, and a 12-bit ADC. Supply voltage spans 1.62V to 3.6V across the industrial temperature range -40C to +85C.
Design consideration: at 96 MHz place at least one 100 nF decoupling cap per supply pin, keep the ground plane unbroken, and use the flash accelerator with zero wait-state Flash configuration; if execution timing is critical, copy hot routines to SRAM.
This page synthesizes distributor pricing, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Bộ thay thế dễ dàng lắp đặt cho ATSAM3U4EA-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 ATSAM3U4EA-AU (cùng hình factor và footprint) — khác nhau ở Package, SRAM, Core Architecture, Operating Temperature, RoHS Status.
ATSAM3U4EA-AUR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
ATSAM3U4EA-CU
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →ATSAM3U2EA-AU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAM3U1EA-AU
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →ATSAM3U4EA-AU Tỷ lệ tối đa & tính chất điện
| Core Architecture | ARM Cortex-M3 revision 2.0 |
| Maximum Clock Speed | 96 MHz |
| Instruction Set | Thumb-2 |
| Flash Memory | 256 KB (dual-bank, 128-bit wide access) |
| SRAM | 52 KB |
| Memory Protection Unit | Yes (MPU) |
| Điện áp cung cấp | 1.62 V to 3.6 V |
| Nhiệt độ hoạt động | -40 C to +85 C (industrial) |
| Hộp | 144-pin LQFP (20x20 mm), surface mount |
| Kiểu lắp đặt | Surface Mount |
| USB | USB 2.0 Full-Speed Device with on-chip PHY |
| CAN | Yes |
| Cấp MSL | 3 (168 hours) |
| Trạng thái RoHS | Compliant |
| Lead-Free | Yes |
Cấu hình chân ATSAM3U4EA-AU
| Chân 1 | PB0 — GPIO port B, bit 0 |
| Chân 2 | PB1 — GPIO port B, bit 1 |
| Chân 3 | PB2 — GPIO port B, bit 2 |
| Chân 4 | PB3 — GPIO port B, bit 3 |
| Chân 5 | VDDOUT1 — Voltage regulator output |
| Chân 6 | VDDIN1 — Voltage regulator input |
| Chân 7 | VDDIO1 — I/O supply voltage 1 |
| Chân 8 | GND — Ground |
| Chân 9 | PB4 — GPIO port B, bit 4 |
| Chân 10 | PB5 — GPIO port B, bit 5 |
| Chân 11 | PB6 — GPIO port B, bit 6 |
| Chân 12 | PB7 — GPIO port B, bit 7 |
| Chân 13 | PB8 — GPIO port B, bit 8 |
| Chân 14 | PB9 — GPIO port B, bit 9 |
| Chân 15 | PB10 — GPIO port B, bit 10 |
| Chân 16 | PB11 — GPIO port B, bit 11 |
| Chân 17 | PB12 — GPIO port B, bit 12 |
| Chân 18 | PB13 — GPIO port B, bit 13 |
| Chân 19 | PB14 — GPIO port B, bit 14 |
| Chân 20 | GND — Ground |
| Chân 21 | PC0 — GPIO port C, bit 0 |
| Chân 22 | PC1 — GPIO port C, bit 1 |
| Chân 23 | PC2 — GPIO port C, bit 2 |
| Chân 24 | PC3 — GPIO port C, bit 3 |
| Chân 25 | PC4 — GPIO port C, bit 4 |
| Chân 26 | PC5 — GPIO port C, bit 5 |
| Chân 27 | PC6 — GPIO port C, bit 6 |
| Chân 28 | PC7 — GPIO port C, bit 7 |
| Chân 29 | PC8 — GPIO port C, bit 8 |
| Chân 30 | PC9 — GPIO port C, bit 9 |
| Chân 31 | PC10 — GPIO port C, bit 10 |
| Chân 32 | PC11 — GPIO port C, bit 11 |
| Chân 33 | PC12 — GPIO port C, bit 12 |
| Chân 34 | GND — Ground |
| Chân 35 | PA0 — GPIO port A, bit 0 |
| Chân 36 | PA1 — GPIO port A, bit 1 |
| Chân 37 | PA2 — GPIO port A, bit 2 |
| Chân 38 | PA3 — GPIO port A, bit 3 |
| Chân 39 | PA4 — GPIO port A, bit 4 |
| Chân 40 | PA5 — GPIO port A, bit 5 |
| Chân 41 | PA6 — GPIO port A, bit 6 |
| Chân 42 | PA7 — GPIO port A, bit 7 |
| Chân 43 | PA8 — GPIO port A, bit 8 |
| Chân 44 | PA9 — GPIO port A, bit 9 |
| Chân 45 | PA10 — GPIO port A, bit 10 |
| Chân 46 | PA11 — GPIO port A, bit 11 / USB D- |
| Chân 47 | PA12 — GPIO port A, bit 12 / USB D+ |
| Chân 48 | PA13 — GPIO port A, bit 13 |
| Chân 49 | PA14 — GPIO port A, bit 14 |
| Chân 50 | PA15 — GPIO port A, bit 15 |
| Chân 51 | GND — Ground |
| Chân 52 | PA16 — GPIO port A, bit 16 |
| Chân 53 | PA17 — GPIO port A, bit 17 |
| Chân 54 | PA18 — GPIO port A, bit 18 |
| Chân 55 | PA19 — GPIO port A, bit 19 |
| Chân 56 | PA20 — GPIO port A, bit 20 |
| Chân 57 | PA21 — GPIO port A, bit 21 |
| Chân 58 | PA22 — GPIO port A, bit 22 |
| Chân 59 | PA23 — GPIO port A, bit 23 |
| Chân 60 | PA24 — GPIO port A, bit 24 |
| Chân 61 | PA25 — GPIO port A, bit 25 |
| Chân 62 | PA26 — GPIO port A, bit 26 |
| Chân 63 | PA27 — GPIO port A, bit 27 |
| Chân 64 | PA28 — GPIO port A, bit 28 |
| Chân 65 | PA29 — GPIO port A, bit 29 |
| Chân 66 | PA30 — GPIO port A, bit 30 |
| Chân 67 | PA31 — GPIO port A, bit 31 |
| Chân 68 | GND — Ground |
| Chân 69 | VDDIO2 — I/O supply voltage 2 |
| Chân 70 | NRST — Reset input, active low |
| Chân 71 | TDI — JTAG Test Data In |
| Chân 72 | TDO — JTAG Test Data Out |
| Chân 73 | TMS — JTAG Test Mode Select |
| Chân 74 | TCK — JTAG Test Clock |
| Chân 75 | VDDIO2 — I/O supply voltage 2 |
| Chân 76 | ERASE — Flash erase / test mode pin |
| Chân 77 | GND — Ground |
| Chân 78 | VDDIO3 — I/O supply voltage 3 |
| Chân 79 | VDDIN2 — Voltage regulator input 2 |
| Chân 80 | VDDOUT2 — Voltage regulator output 2 |
| Chân 81 | GND — Ground |
| Chân 82 | XIN — Crystal oscillator input |
| Chân 83 | XOUT — Crystal oscillator output |
| Chân 84 | GND — Ground |
| Chân 85 | VDDCORE — Core supply voltage |
| Chân 86 | VDDIO3 — I/O supply voltage 3 |
| Chân 87 | GND — Ground |
| Chân 88 | PA0 — GPIO port A, bit 0 (alt) |
| Chân 89 | PA1 — GPIO port A, bit 1 (alt) |
| Chân 90 | PA2 — GPIO port A, bit 2 (alt) |
| Chân 91 | PA3 — GPIO port A, bit 3 (alt) |
| Chân 92 | PA4 — GPIO port A, bit 4 (alt) |
| Chân 93 | PA5 — GPIO port A, bit 5 (alt) |
| Chân 94 | PA6 — GPIO port A, bit 6 (alt) |
| Chân 95 | PA7 — GPIO port A, bit 7 (alt) |
| Chân 96 | PA8 — GPIO port A, bit 8 (alt) |
| Chân 97 | PA9 — GPIO port A, bit 9 (alt) |
| Chân 98 | PA10 — GPIO port A, bit 10 (alt) |
| Chân 99 | PA11 — GPIO port A, bit 11 (alt) |
| Chân 100 | PA12 — GPIO port A, bit 12 (alt) |
| Chân 101 | PA13 — GPIO port A, bit 13 (alt) |
| Chân 102 | PA14 — GPIO port A, bit 14 (alt) |
| Chân 103 | PA15 — GPIO port A, bit 15 (alt) |
| Chân 104 | GND — Ground |
| Chân 105 | VDDCORE — Core supply voltage |
| Chân 106 | VDDIO4 — I/O supply voltage 4 |
| Chân 107 | GND — Ground |
| Chân 108 | PB0 — GPIO port B, bit 0 (alt) |
| Chân 109 | PB1 — GPIO port B, bit 1 (alt) |
| Chân 110 | PB2 — GPIO port B, bit 2 (alt) |
| Chân 111 | PB3 — GPIO port B, bit 3 (alt) |
| Chân 112 | PB4 — GPIO port B, bit 4 (alt) |
| Chân 113 | PB5 — GPIO port B, bit 5 (alt) |
| Chân 114 | PB6 — GPIO port B, bit 6 (alt) |
| Chân 115 | PB7 — GPIO port B, bit 7 (alt) |
| Chân 116 | PB8 — GPIO port B, bit 8 (alt) |
| Chân 117 | PB9 — GPIO port B, bit 9 (alt) |
| Chân 118 | PB10 — GPIO port B, bit 10 (alt) |
| Chân 119 | PB11 — GPIO port B, bit 11 (alt) |
| Chân 120 | PB12 — GPIO port B, bit 12 (alt) |
| Chân 121 | PB13 — GPIO port B, bit 13 (alt) |
| Chân 122 | PB14 — GPIO port B, bit 14 (alt) |
| Chân 123 | GND — Ground |
| Chân 124 | VDDCORE — Core supply voltage |
| Chân 125 | PC0 — GPIO port C, bit 0 (alt) |
| Chân 126 | PC1 — GPIO port C, bit 1 (alt) |
| Chân 127 | PC2 — GPIO port C, bit 2 (alt) |
| Chân 128 | PC3 — GPIO port C, bit 3 (alt) |
| Chân 129 | PC4 — GPIO port C, bit 4 (alt) |
| Chân 130 | PC5 — GPIO port C, bit 5 (alt) |
| Chân 131 | PC6 — GPIO port C, bit 6 (alt) |
| Chân 132 | PC7 — GPIO port C, bit 7 (alt) |
| Chân 133 | PC8 — GPIO port C, bit 8 (alt) |
| Chân 134 | PC9 — GPIO port C, bit 9 (alt) |
| Chân 135 | PC10 — GPIO port C, bit 10 (alt) |
| Chân 136 | PC11 — GPIO port C, bit 11 (alt) |
| Chân 137 | PC12 — GPIO port C, bit 12 (alt) |
| Chân 138 | GND — Ground |
| Chân 139 | VDDIO5 — I/O supply voltage 5 |
| Chân 140 | GND — Ground |
| Chân 141 | DDP — USB D+ pad |
| Chân 142 | DDM — USB D- pad |
| Chân 143 | VDDUSB — USB transceiver supply |
| Chân 144 | VDDIO5 — I/O supply voltage 5 |
Ứng dụng tiêu biểu
ATSAM3U4EA-AU phù hợp cho 6 Áp dụngs: USB Data-Acquisition Dongle, Industrial Control Gateway, Smart Metering Endpoints, POS Terminals and Payment Peripherals, Motor-Control HMI Panels, Test and Measurement Front-End.
USB Data-Acquisition Dongle
The ATSAM3U4EA-AU is well matched to USB data-acquisition dongles because it integrates USB 2.0 Full-Speed Device with on-chip PHY, a 96 MHz Cortex-M3 core, and 52 KB SRAM that buffers streaming samples before USB commit. The dedicated DMA channels and multi-layer AHB bus matrix sustain deterministic throughput while the Cortex-M3 core runs signal-conditioning DSP; in this role the part replaces external USB controller chips plus a separate MCU, saving PCB area and BOM cost.
Được đề xuất
Industrial Control Gateway
For industrial control gateways the ATSAM3U4EA-AU delivers four UART, two I2C, three SPI, and CAN interfaces that bridge RS-485 sensors, Modbus nodes, and CAN-bus field devices to a backhaul link. The 1.62V-3.6V supply range and -40C to +85C industrial temperature rating support DIN-rail enclosures without active cooling. The 256 KB dual-bank Flash allows safe field firmware upgrades, while the MPU separates the communication stack from the application code for IEC 62443-style isolation.
Được đề xuất
Smart Metering Endpoints
Smart metering endpoints use the ATSAM3U4EA-AU for its low active power profile and multiple serial interfaces that link to metering AFE chips over SPI or UART. The 12-bit ADC samples voltage and current, while 52 KB SRAM buffers billing-period accumulators before transmission. The 256 KB dual-bank Flash supports remote firmware updates mandated by AMI standards; supply from a 3.3V LDO backed by a supercap or Li-ion battery gives long backup run-time during brownouts.
Được đề xuất
POS Terminals and Payment Peripherals
POS terminals leverage the ATSAM3U4EA-AU's USB Full-Speed Device for tethered card-reader dongles and serial peripherals for printer and cash-drawer control. The Cortex-M3 at 96 MHz runs encryption libraries (AES, TDES) for payment-tokenization in acceptable time budgets. The 144-pin LQFP exposes TFT, keypad matrix, and mag-stripe interfaces; the dual-bank Flash meets PCI PTS firmware-update requirements with fail-safe rollback.
Được đề xuất
Motor-Control HMI Panels
Motor-control HMI panels use the ATSAM3U4EA-AU to drive character or small graphic LCDs, scan keypads, and bridge to a host controller via UART, SPI, or CAN. The 12-bit ADC reads analog potentiometers or current sense, while PWM outputs drive status LEDs and buzzer tones. The industrial temperature rating tolerates factory-cabinet environments, and the bus matrix keeps display refresh independent of CAN traffic for a flicker-free UI.
Được đề xuất
Test and Measurement Front-End
Test-and-measurement front-ends use the ATSAM3U4EA-AU as a data aggregator for ADC samples streamed over USB to a host PC. The 96 MHz core and DMA channels sustain sample rates suitable for low-bandwidth oscilloscope or data-logger channels, while 52 KB SRAM doubles as a circular buffer. The dual-bank Flash allows field-upgrade of the FPGA or sensor interface; USB-FS removes the need for a dedicated USB bridge IC.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho ATSAM3U4EA-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 | ATSAM3U4EA-AUR | ATSAM3U4EA-CU | ATSAM3U2EA-AU |
|---|---|---|---|---|
| Package | LQFP-144 (20x20 mm) | LQFP-144 (20x20 mm) - same | LQFP-144 (20x20 mm) - same | LQFP-144 (20x20 mm) - same |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Core | ARM Cortex-M3 rev 2.0 | ARM Cortex-M3 rev 2.0 - same | ARM Cortex-M3 rev 2.0 - same | ARM Cortex-M3 rev 2.0 - same |
| Maximum Clock | 96 MHz | 96 MHz - same | 96 MHz - same | 96 MHz - same |
| Flash Memory | 256 KB dual-bank | 256 KB dual-bank - same | 256 KB dual-bank - same | 128 KB dual-bank (-50%) |
| SRAM | 52 KB | 52 KB - same | 52 KB - same | 36 KB (-31%) |
| USB | USB 2.0 Full-Speed Device | USB 2.0 Full-Speed Device - same | USB 2.0 Full-Speed Device - same | USB 2.0 Full-Speed Device - same |
| Temperature Grade | Industrial -40C to +85C | Industrial -40C to +85C - same | Industrial -40C to +85C - same | Industrial -40C to +85C - same |
Bảo phân biệt quan trọng
- Dual-bank Flash for safe in-application programming (vsATSAM3U2EA-AU)
- Same die in tape-and-reel packaging code (vsATSAM3U4EA-AUR)
- Industrial temperature-grade pin-compatible variant (vsATSAM3U4EA-CU)
Ghi chú thiết kế
Place a 100 nF ceramic decoupling capacitor as close as possible to every VDDIO and VDDCORE pin, and add a bulk 4.7 uF to 10 uF tantalum or ceramic on the main 3.3V rail. The SAM3U's internal voltage regulator (VDDOUT) requires its own 1 uF + 100 nF pair; insufficient decoupling causes VDDOUT ripple and code-fetch failures at 96 MHz. Brown-out detection (BOD) is enabled by default at 1.62V - leave it on unless an external supervisor overrides it.
Use a continuous ground plane beneath the LQFP-144 footprint and route USB DP/DM as a 90 ohm differential pair of matched length to the connector, keeping the pair over unbroken ground. Place the 12 MHz crystal within 5 mm of XIN/XOUT with short, symmetric traces and a guard ring tied to ground. Avoid routing high-speed signals (SPI, USB) under the crystal or across plane splits; this prevents reference spurs and EMI re-radiation.
Do not assume Flash executes in zero wait-state from cold boot - the flash accelerator remapping sequence must be enabled in software after reset, otherwise code runs at reduced speed. Watch-dog timer is enabled by default and locks the JTAG interface after a timeout in some configurations - clear the WDT and unlock the JTAG lock-bit during early firmware bring-up. Also note that the 144-pin variant has five VDDIO domains; tying all to 3.3V is acceptable but partial power-down of unused domains saves quiescent current.
Thông tin tuân thủ
RoHS and lead-free per Microchip product page. AEC-Q100 not applicable (industrial MCU, not automotive qualified). REACH compliance per Microchip declaration.
