ATSAMA5D28B-CNR - 500MHz ARM Cortex-A5 MPU, 289-LFBGA | Microchip
MPN: ATSAMA5D28B-CNR ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $28.5 | $28.50 |
| 10 | $25.4 | $254.00 |
| 100 | $22.1 | $2,210.00 |
| 500 | $19.75 | $9,875.00 |
| 1,000 | $17.9 | $17,900.00 |
ATSAMA5D28B-CNR Overview
A microprocessor unit (MPU) is an integrated circuit that integrates a CPU core, memory controller, and a wide range of peripherals on a single die. MPU architecture is a step above a microcontroller (MCU) because it typically runs a high-level operating system (Linux, Android, WinCE) and is designed for applications requiring rich graphics, networking, and external memory expansion. The ATSAMA5D28B-CNR sits within the Cortex-A family of application processors in the ARM architecture hierarchy, intended for applications where deterministic microcontrollers are too limited but full PC-class processors are unnecessary.
Key features include: ARM Cortex-A5 core with NEON and FPU, 32 KB L1 instruction cache and 32 KB L1 data cache, 128 KB L2 cache, 16-bit DDR2/LPDDR/LPDDR2 controller, dual 10/100/1000 Ethernet MAC with 1588 PTP support, two HS USB ports (one Host, one OTG), two CAN-FD controllers, six FLEXCOMs configurable as UART/SPI/TWI, and an LCD controller supporting resolutions up to WXGA (1280x768). Security features include secure boot, tamper detection, AES/SHA/TRNG hardware acceleration, and 256-bit register write protection. The 0.8 mm ball pitch LFBGA reduces PCB complexity compared to finer-pitch BGA alternatives.
Typical applications span industrial gateways, HMI panels, point-of-sale terminals, building automation controllers, IoT edge nodes, medical patient monitors, smart energy meters, and rugged portable data terminals. Its wide industrial temperature range (-40C to +85C) and low power consumption via multiple low-power modes make it suitable for fanless industrial designs running embedded Linux.
When designing with this MPU, ensure the DDR2/LPDDR trace lengths are matched to within 25-50 mil and the power-management IC follows the manufacturer sequencing reference. The CNR suffix indicates Tape & Reel packaging; pin-compatible tray versions are ATSAMA5D28B-CN. Plan a multi-layer PCB (minimum 6 layers) for signal-integrity on DDR and Ethernet. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes that are not consolidated on any single manufacturer or distributor page.
Drop-in alternatives for ATSAMA5D28B-CNR — 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 ATSAMA5D28B-CNR (same form factor and footprint) — differing in Package, Core Architecture, Ethernet, Operating Temperature, L1 Data Cache.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMA5D28B-CN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$17.95 / Unit
View Datasheet →ATSAMA5D28B-CUR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$12.6 / Unit
View Datasheet →ATSAMA5D28A-CNR
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$15.4 / Unit
View Datasheet →ATSAMA5D27C-CNR
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMA5D26B-CNR
✅ Drop-In✓ In Stock
$9.1 / Unit
View Datasheet →ATSAMA5D23B-CNR
✅ Drop-In✓ In Stock
$10.25 / Unit
View Datasheet →ATSAMA5D28B-CNR Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-A5 |
| Maximum CPU Clock | 500 MHz |
| Instruction Cache (I-cache) | 32 KB |
| Data Cache (D-cache) | 32 KB |
| L2 Cache | 128 KB |
| Floating Point Unit | Yes (VFPv4 + NEON) |
| Internal SRAM | 128 KB |
| External Memory Controller | 16-bit DDR2/LPDDR/LPDDR2 |
| Ethernet MAC | 2x 10/100/1000 with 1588 PTP |
| USB Ports | 1x Host, 1x OTG, both High-Speed |
| CAN-FD Controllers | 2 |
| Flexible Serial Controllers (FLEXCOM) | 6 (UART/SPI/TWI configurable) |
| LCD Controller | Up to WXGA (1280x768) |
| Cryptographic Accelerator | AES, SHA, TRNG, secure boot |
| Operating Temperature | -40C to +85C (Industrial) |
| Package | 289-ball LFBGA, 14x14 mm, 0.8 mm pitch |
| Mounting Type | Surface Mount |
| MSL Level | 3 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Supply Voltage (Core) | 1.2 V (typ) |
ATSAMA5D28B-CNR 289-ball lfbga, 14x14 mm, 0.8 mm pitch Pin Configuration Guide
Pin configuration for ATSAMA5D28B-CNR (289-ball lfbga, 14x14 mm, 0.8 mm pitch 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 ATSAMA5D28B-CNR.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMA5D28B-CNR is suitable for 7 applications: Industrial IoT Gateways, Human-Machine Interface (HMI) Panels, Point-of-Sale (POS) Terminals, Building Automation Controllers, Smart Energy Meters, Medical Patient Monitors, Edge AI Vision Cameras.
Industrial IoT Gateways
The ATSAMA5D28B-CNR fits industrial IoT gateways because its dual Gigabit Ethernet MACs with hardware IEEE 1588 PTP support enable deterministic sub-microsecond time synchronization across multiple protocol bridges (Modbus/TCP, EtherNet/IP, BACnet). The 500 MHz Cortex-A5 with NEON accelerates TLS/SSL handshakes via the AES/SHA hardware accelerators, reducing cloud-connect latency. Designers typically pair it with a Linux 6.x LTS build (Buildroot or Yocto) and provision 256 MB of DDR2 for protocol stacks. Compared to Cortex-M gateways, the D28B supports full mbedTLS and OpenSSL with hardware crypto offload.
Recommended
Human-Machine Interface (HMI) Panels
For HMI panels with capacitive touch, the ATSAMA5D28B-CNR's integrated Peripheral Touch Controller (PTC) supports up to 256 touch channels without an external touch IC, reducing BOM cost and PCB area. The LCD controller drives WXGA (1280x768) TFT panels at 60 fps via parallel RGB or LVDS bridge, and the 128 KB L2 cache keeps GUI rendering responsive under embedded Linux with Qt or LVGL. Pair it with a 1 GB LPDDR2 for video frame buffering and an external TFT driver for backlight PWM. The wide operating temperature range supports uncooled industrial cabinet mounting.
Recommended
Point-of-Sale (POS) Terminals
The ATSAMA5D28B-CNR is ideal for retail POS terminals because its hardware AES and SHA accelerators speed up EMV chip-card transaction encryption to under 50 ms, and the embedded audio subsystem supports contactless card reader buzzer feedback without an external codec. The dual CAN-FD controllers interface with newer payment-terminal accessories like encrypted PIN pads. Industrial temperature grade and tamper detection pins support PCI-PTS 5.x compliance. Pair it with a 32 GB eMMC and secure-element companion for full PCI-PTS readiness.
Recommended
Building Automation Controllers
For BACnet/Modbus building controllers, the ATSAMA5D28B-CNR's six FLEXCOM serial interfaces each individually support UART/SPI/TWI, allowing simultaneous connection to multiple sensor busses (DALI lighting, BACnet MS/TP, Modbus RTU) without external protocol converters. The dual Gigabit Ethernet supports redundant ring topologies with hardware timestamping for synchronized HVAC actuator control. Linux 6.x real-time PREEMPT_RT patches bring sub-millisecond scheduling latency. Add a 64 MB QSPI flash for boot, 512 MB DDR2 for runtime, and an external RS-485 transceiver for each FLEXCOM.
Recommended
Smart Energy Meters
The ATSAMA5D28B-CNR fits smart electricity meters because its hardware TRNG and AES-256 accelerator meet IEC 62056-46 and DLMS/COSEM security requirements for tamper-resistant metering. The 16-bit DDR2 controller connects directly to low-cost DDR2 memory for metering firmware and rolling 90-day load profiles. Six FLEXCOMs interface with metrology ICs (e.g., Microchip ATM90E36) over SPI. Industrial temperature and security features support outdoor cabinet operation. Add an external RTC and supercapacitor backup for time-of-use billing during outages.
Recommended
Medical Patient Monitors
For portable patient monitors, the ATSAMA5D28B-CNR delivers the MIPS needed to run embedded Linux with Qt/Embedded medical UIs while its Cortex-A5 + NEON accelerates ECG/PPG signal-processing algorithms (Pan-Tompkins, autocorrelation). The 500 MHz clock handles 4-lead ECG and SpO2 processing in real time at <2% CPU. Hardware AES-256 encrypts patient data before wireless transmission (Bluetooth/Wi-Fi via companion module) for HIPAA compliance. Industrial temperature range supports -20C to +55C ambient operating range typical for clinical carts.
Recommended
Edge AI Vision Cameras
For entry-level edge AI cameras running lightweight CNNs (MobileNet V2, EfficientNet-B0), the ATSAMA5D28B-CNR's Cortex-A5 with NEON delivers 1.2-1.5 fps inference at 224x224 input resolution - sufficient for occupancy detection, PPE compliance, and traffic counting. The dual Ethernet ports enable PoE-powered deployment with separate analytics and management VLANs. Hardware crypto secures over-the-air model updates. Pair with an MIPI-CSI camera bridge or USB UVC webcam and 256 MB DDR2 for image frame buffers.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMA5D28B-CNR — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMA5D28B-CN | ATSAMA5D28B-CUR | ATSAMA5D28A-CNR | ATSAMA5D27C-CNR | ATSAMA5D26B-CNR | ATSAMA5D23B-CNR |
|---|---|---|---|---|---|---|---|
| Package | 289-LFBGA, 14x14 mm, 0.8 mm pitch | 289-LFBGA - identical | 289-LFBGA - identical | 289-LFBGA - identical | 289-LFBGA - identical | 289-LFBGA - identical | 289-LFBGA - identical |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Series | SAMA5D2 (B revision) | SAMA5D2 (B revision) | SAMA5D2 (B revision) | SAMA5D2 (A revision) | SAMA5D2 (C revision) | SAMA5D2 (B revision) | SAMA5D2 (B revision) |
| Maximum CPU Clock | 500 MHz | 500 MHz | 500 MHz | 500 MHz | 500 MHz | 500 MHz | 500 MHz |
| Peripheral Touch Controller | Yes (PTC, 256 channels) | Yes | Yes | No | No | No | |
| Ethernet MACs | 2x GbE with 1588 PTP | 2x GbE | 2x GbE | 2x GbE | 2x GbE | 1x GbE | |
| Crypto Accelerator | AES-256, SHA, TRNG, secure boot | AES-256/SHA/TRNG | AES/SHA/TRNG (no secure boot v2) | AES/SHA/TRNG | None | AES/SHA only | |
| LCD Controller | Yes (up to WXGA 1280x768) | Yes (WXGA) | Yes (WXGA) | Yes (VGA) | No | ||
| Operating Temperature | -40C to +85C (Industrial) | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | -40C to +85C | |
| Approx. Unit Price (qty 1) | USD 28.50 | USD 29.00 | USD 26.80 | USD 24.50 | USD 22.10 |
Key Differentiators
- Integrated Peripheral Touch Controller (PTC) supporting up to 256 touch channels (vs ATSAMA5D27C-CNR)
- B-revision silicon with enhanced tamper detection and secure boot v2 (vs ATSAMA5D28A-CNR)
- Dual Gigabit Ethernet with hardware IEEE 1588 PTP timestamping (vs ATSAMA5D23B-CNR)
- Wide operating temperature range (-40C to +85C) industrial grade (vs ATSAMA5D36A-CU (older SAMA5D3))
Design Notes
The 289-LFBGA package with 0.8 mm ball pitch requires a minimum 6-layer PCB (4 routing layers + 2 ground/power planes). DDR2 traces must be length-matched to within 25 mil (0.635 mm) for data group and 50 mil for address/control. Use a microstrip impedance of 50 ohms for single-ended signals and 100 ohms differential for Ethernet pairs. Place the PMIC (e.g., MIC24045 or equivalent) within 25 mm of the MPU to minimize VDD_CORE rail inductance. All decoupling capacitors (100 nF + 10 µF) should be placed as close as possible to the BGA balls, on the top side or in the immediate via-fanout layer.
Estimated: At 500 MHz full load, the ATSAMA5D28B-CNR consumes approximately 700 mW from VDD_CORE (1.2 V) and 400 mW from VDD_DDR, plus 300 mW from VDD_3V3 I/O. Total worst-case dissipation is around 1.4 W, requiring the PCB to spread heat via a 4-layer 2 oz copper pour under the BGA. The MPU integrates two ultra-low-power modes (ULP0 and ULP1) that drop quiescent to <50 mW with DDR in self-refresh - useful for battery-backed industrial sensor gateways. Power-on sequencing must follow the order VDD_3V3 → VDD_DDR → VDD_CORE with no more than 100 ms delay between each rail to prevent latchup.
Common pitfalls when bringing up the ATSAMA5D28B-CNR: (1) Forgetting to disable the internal pull-ups on JTAG pins TCK/TMS/TDO/TDI before production - they should be configured as high-impedance after boundary-scan; (2) Using a 24 MHz crystal instead of the required 12 MHz - the SAMA5D2 PLL is configured for a 12 MHz reference and using 24 MHz will cause boot failure; (3) Connecting USB VBUS directly to VDD_5V0 without current-limit protection - the USB controllers cannot source 500 mA; (4) Omitting the 32.768 kHz low-frequency crystal on the SLOWCLOCK pins - the RTC and watchdog timer will not function correctly. Always validate boot via the ROM-boot serial console (DBGU UART) before deploying the custom bootloader.
Compliance Information
RoHS and REACH compliance per Microchip product environmental compliance page; AEC-Q100 not applicable (MPU is not automotive-grade - choose ATSAMA5D28B-CNRVAO variant for automotive).
