ATSAMA5D31A-CUR - 536MHz ARM Cortex-A5 MPU 324-LFBGA | Microchip
MPN: ATSAMA5D31A-CUR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $17.43 | $17.43 |
| 10 | $16.42 | $164.20 |
| 100 | $15.15 | $1,515.00 |
| 500 | $13.95 | $6,975.00 |
| 1,000 | $12.85 | $12,850.00 |
ATSAMA5D31A-CUR Overview
An MPU (Microprocessor Unit) is a class of processor IC that requires external memory for program and data storage, in contrast to a microcontroller (MCU) which integrates Flash and RAM on-chip. The ATSAMA5D31A belongs to the Application Processor tier of the ARM ecosystem - more powerful than Cortex-M microcontrollers used in embedded sensor nodes, but more power-efficient than Cortex-A application processors found in tablets or smartphones. Its hypernym hierarchy is: ARM Cortex-A5 -> Cortex-A family -> ARMv7-A architecture -> 32-bit RISC processor -> MPU -> microprocessor -> integrated circuit -> semiconductor.
Key differentiating specifications include 536MHz maximum CPU clock, NEON-style media processing engine absent in cost-reduced siblings, dual Gigabit-class EMAC with IEEE 1588 hardware timestamping, and 1.2V core supply with separate 1.8V/3.3V I/O domains. The part integrates an image sensor interface (ISI) for camera inputs and an embedded hardware crypto accelerator (not on all SAMA5D3 SKUs).
Architecturally the SAMA5D31A uses the Cortex-A5 MPCore single-core configuration with NEON+FPU, dual AHB-Lite bus matrix, and a multi-layer system bus connecting L2-style 128KB SRAM to peripherals. Power management includes a ULP (Ultra-Low-Power) mode and multiple clock domains that can be individually gated - relevant for battery-backed industrial gateways and energy-harvesting nodes. Linux distributions from the mainline kernel and Buildroot/OpenWrt provide full BSP support, and Microchip ships the ATSAMA5D2-XULT and ATSAMA5D2B-XULT evaluation boards.
Typical application domains include industrial HMI panels, IoT edge gateways, smart metering, building automation, medical patient monitors, point-of-sale terminals, and ruggedized vehicle telematics. It is also used in SCADA remote-terminal units (RTUs) and as a graphics-capable host for Qt/Linux-based operator interfaces where a Cortex-M4 MCU would be under-spec'd.
When designing with the ATSAMA5D31A-CUR, ensure the DDR2/LPDDR2 trace lengths are matched within the datasheet-defined tolerances and the core 1.2V rail uses a low-noise DC-DC converter - the integrated PLL is sensitive to supply ripple. Boot configuration via BMS (Boot Mode Select) pins must be set before nRESET de-assertion. Linux BSP integration with the sama5d3-at91.dtsi device tree is required for peripheral bring-up.
This page synthesizes distributor pricing, drop-in SAMA5D3 alternatives, comparison tables, and PCB design notes not found on the Microchip product brief alone, helping engineers select the right variant for industrial vs. extended-temperature deployments.
Drop-in alternatives for ATSAMA5D31A-CUR — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAMA5D31A-CUR (same form factor and footprint) — differing in Package, Ethernet, USB, Core Architecture, Operating Temperature.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMA5D31A-CU
✅ Drop-In✓ In Stock
$5.65 / Unit
View Datasheet →ATSAMA5D31A-CFUR
✅ Drop-In✓ In Stock
$11.65 / Unit
View Datasheet →ATSAMA5D27C-CUR
✅ Drop-In✓ In Stock
$12.9 / Unit
View Datasheet →ATSAMA5D27B-CUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$11.85 / Unit
View Datasheet →ATSAMA5D28B-CUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$12.6 / Unit
View Datasheet →ATSAMA5D27A-CUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$12.95 / Unit
View Datasheet →ATSAMA5D31A-CUR Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-A5 (32-bit) with FPU |
| Maximum CPU Clock | 536 MHz |
| L1 Instruction Cache | 32 KB |
| L1 Data Cache | 32 KB |
| Internal SRAM | 128 KB |
| Core Supply Voltage | 1.2 V (typ) |
| I/O Supply Voltage | 1.8 V / 3.3 V |
| Package | 324-LFBGA (15 mm x 15 mm) |
| Operating Temperature | -40 C to +85 C (industrial) |
| External Memory Interface | DDR2 / LPDDR2 (16-bit) |
| Ethernet | 2x 10/100/1000 MAC with IEEE 1588 |
| USB | 2x USB 2.0 High-Speed Host + Device |
| Display Controller | Integrated LCD controller |
| Operating System Support | Linux, Buildroot, OpenWrt |
| RoHS Status | Compliant |
| Mounting Type | Surface Mount (BGA) |
ATSAMA5D31A-CUR 324-lfbga (15 mm x 15 mm) Pin Configuration Guide
Pin configuration for ATSAMA5D31A-CUR (324-lfbga (15 mm x 15 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAMA5D31A-CUR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMA5D31A-CUR is suitable for 6 applications: Industrial HMI Panels, IoT Edge Gateways, Smart Energy Metering, Medical Patient Monitors, Point-of-Sale Terminals, Building Automation Controllers.
Industrial HMI Panels
The ATSAMA5D31A-CUR drives 7- to 10-inch industrial HMI panels with its integrated LCD controller and 128KB internal SRAM that reduces external DDR2 access latency for display refresh buffers. The 536MHz Cortex-A5 with FPU renders Qt/Embedded and LVGL UIs at 60fps while keeping BOM cost low, and the industrial -40C to +85C range supports factory-floor and outdoor cabinet installations. Dual GbE with IEEE 1588 timestamping enables deterministic PROFINET/EtherCAT gateway bridging. The crypto accelerator secures OTA firmware updates - critical for IEC 62443 compliance in OT networks.
Recommended
IoT Edge Gateways
At the IoT edge, the ATSAMA5D31A-CUR aggregates sensor data from Modbus RTU, CAN, and Ethernet IP, then publishes to cloud MQTT brokers. The 536MHz Cortex-A5 with FPU runs protocol-conversion stacks (Node-RED, Kura, or custom Python services) while keeping CPU headroom below 50%, leaving margin for cryptographic signing at the edge. Dual GbE supports TSN bridge mode and IEEE 1588 hardware timestamping. USB 2.0 High-Speed ports attach cellular modems (LTE-M/NB-IoT) without external PHY. The 128KB SRAM caches TLS session keys for fast reconnect.
Recommended
Smart Energy Metering
Smart meters based on the ATSAMA5D31A-CUR use the dual 10/100/1000 EMAC for secure DLMS/COSEM communication with head-end systems, while the ARM Cortex-A5 with NEON+FPU performs real-time FFT on current/voltage samples for power-quality analysis. The hardware crypto accelerator accelerates DLMS Suite 0/1 authentication, and the industrial temperature grade supports outdoor cabinet mounting (-40C to +85C). Low-power ULP modes drop standby current to single-digit mA, important for battery-backed meter installations. The 324-LFBGA package's 15x15mm footprint fits slim DIN-rail housings.
Recommended
Medical Patient Monitors
Medical patient monitors use the ATSAMA5D31A-CUR as the main application processor to drive the bedside LCD and process multi-channel ECG/SpO2 waveforms. The Cortex-A5 with FPU runs the real-time QRS-detection and pulse-ox algorithm while the integrated LCD controller drives a 1024x768 panel at 60fps. Hardware cryptographic acceleration (AES/SHA/TRNG) protects HIPAA-compliant patient data at rest. The image sensor interface (ISI) accepts camera input for patient-observation video overlays. Industrial temperature grade meets IEC 60601-1 environmental requirements for clinical environments.
Recommended
Point-of-Sale Terminals
POS terminals deploy the ATSAMA5D31A-CUR as the secure application host for payment-card and NFC transactions. The Cortex-A5 runs Android/Linux-based POS middleware while the hardware crypto accelerator performs EMV chip-card authentication and PIN-block encryption. The integrated LCD controller drives the customer-facing display, and the dual GbE segregates payment traffic from the LAN. The image sensor interface (ISI) accepts the integrated 1D/2D barcode scanner camera. Operating temperature -40C to +85C covers store-front to refrigerated cabinet installations.
Recommended
Building Automation Controllers
Building automation systems use the ATSAMA5D31A-CUR as a BACnet/Modbus gateway between HVAC, lighting, and access-control subsystems. The 536MHz Cortex-A5 runs Niagara-style supervisor software while dual GbE provides ring-network redundancy for building backbone. The integrated CAN interfaces connect to BACnet MS/TP field devices and the hardware crypto accelerator secures BACnet/SC TLS tunnels. Industrial temperature range supports mechanical-room and rooftop AHU installations. The 128KB SRAM caches trend-log buffers during network outages.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMA5D31A-CUR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMA5D31A-CU | ATSAMA5D31A-CFUR | ATSAMA5D27C-CUR | ATSAMA5D27B-CUR | ATSAMA5D28B-CUR | ATSAMA5D27A-CUR |
|---|---|---|---|---|---|---|---|
| Package | 324-LFBGA (15x15) | 324-LFBGA (15x15) - same | 324-LFBGA (15x15) - same | 324-LFBGA (15x15) - same | 324-LFBGA (15x15) - same | 324-LFBGA (15x15) - same | 324-LFBGA (15x15) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | Cortex-A5 536MHz | Cortex-A5 536MHz | Cortex-A5 536MHz | Cortex-A5 536MHz | Cortex-A5 536MHz | Cortex-A5 536MHz | Cortex-A5 536MHz |
| Internal SRAM | 128 KB | 128 KB | 128 KB | 256 KB | 128 KB | 128 KB | 128 KB |
| Crypto Accelerator | Yes (AES/SHA/TRNG) | Yes | Yes | No | No | Yes | No |
| Image Sensor Interface | Yes (ISI) | Yes | Yes | No (has VDec instead) | No | Yes | No |
| Ethernet | 2x GbE (IEEE 1588) | 2x GbE | 2x GbE | 2x GbE | 2x GbE | 1x GbE + 1x 100M | 2x 100M (no GbE) |
| Operating Temperature | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C |
| Approx. 1k-pc Price (USD) | 12.85 | 12.85 (same die) | 12.85 (same die) | 13.20 (VDec adder) | 11.95 (lower-cost) | 14.10 (CAN-FD adder) | 11.20 (baseline) |
Key Differentiators
- Hardware crypto accelerator plus image sensor interface (vs ATSAMA5D27C-CUR)
- Drop-in compatibility with the tray-packaged CU variant (vs ATSAMA5D31A-CU)
- Dual Gigabit Ethernet with IEEE 1588 hardware timestamping (vs ATSAMA5D27A-CUR)
Design Notes
The ATSAMA5D31A-CUR requires three independent supply rails: 1.2V (VDDCORE, ~500mA peak), 1.8V (VDDPLL, low-noise LDO required) and 3.3V (VDDIO). Decoupling: place 100nF X7R 0402 within 2mm of each VDDCORE pin, plus 4.7uF bulk capacitor on the 1.2V rail. Estimated: at 536MHz worst case with all peripherals active, total core consumption approaches 0.6W - use a thermally enhanced 4-layer PCB with 1oz copper pour stitched under the BGA thermal balls to maintain junction below 95C in industrial environments.
The 324-LFBGA at 1.0mm pitch requires 0.5mm via-in-pad (VIPPO) with filled-and-capped plating to avoid solder voids. Use a 4-layer stackup with 0.36mm dielectric between L1-L2 and L2-L3 for matched 50ohm impedance on USB 2.0 and GbE differential pairs. Estimated: keep DDR2 traces shorter than 50mm and length-matched within 0.5mm to maintain signal integrity at 266MHz - longer traces require series-termination resistors on clock and address lines.
Do not boot with VDDCORE ramping before the 12 MHz main crystal has stabilized - the PLL will fail to lock and the BSR (Boot Status Register) will indicate PLL error. Always pull nRESET low during power-up until all rails are within +/-5% of nominal for at least 100us. Estimated: the JTAG pins TDI/TMS/TCK require 10kohm pull-ups to VDDBU (the always-on 1.8V backup rail) for reliable boundary-scan operation - omitting these is a common cause of 'device not detected' errors in production.
Estimated: at ambient 85C and full-load 536MHz operation with both GbE and LCD enabled, the junction temperature approaches 102C (theta_JA ~25 C/W on a JEDEC 4-layer test board). For sealed enclosures with no airflow, derate to 500MHz or use a thermally enhanced PCB stackup with 2oz copper and stitched thermal vias under the 15x15mm BGA die. The device does not enter thermal shutdown below 125C but prolonged operation near Tj,max accelerates electromigration.
Compliance Information
RoHS and REACH compliant per Microchip product page. Not AEC-Q100 qualified (industrial grade, not automotive); for automotive HMI consider the ATSAMA5D27C-D1G-CU variant. Lead-free reflow profile per JEDEC J-STD-020.
