Microchip Technology ATSAMA5D21B-CU

Overview

ATSAMA5D21B-CU from Microchip Technology is an ultra-low-power Arm Cortex-A5-based microprocessor unit (MPU) operating at up to 500 MHz, featuring a 128-Kbyte configurable L2 cache, TrustZone security, and hardware crypto accelerators (AES-256, SHA-256, TRNG). It integrates a 10/100 Ethernet MAC, dual CAN-FD controllers, USB high-speed host/device ports, and supports DDR2/DDR3L/LPDDR2/LPDDR3 memory. It targets secure industrial HMI, IoT gateways, and point-of-sale terminals requiring real-time connectivity and tamper-resistant boot.

For engineers reviewing the ATSAMA5D21B-CU datasheet, ATSAMA5D21B-CU pinout, ATSAMA5D21B-CU application, or ATSAMA5D21B-CU equivalent, this page delivers verified technical context, validated package mapping (196-ball TFBGA, 11×11 mm), confirmed low-power modes (ULP0/ULP1/Backup), exact peripheral count (5 FLEXCOMs, 12-channel 12-bit ADC), and two validated alternative MPUs with documented functional differences.

Technical Context

The ATSAMA5D21B-CU implements an Armv7-A architecture Cortex-A5 core with NEON SIMD engine and floating-point unit (FPU), paired with a Memory Management Unit (MMU) and dual 32-Kbyte L1 caches. Its multilayer bus architecture supports 2×16-channel DMA controllers for zero-overhead data transfers between peripherals including GMAC, ISC, LCDC, and SDMMC.

Security is enforced via Arm TrustZone, 5-Kbyte scrambled SRAM (1-Kbyte nonerasable on tamper), eight tamper pins (PIOBU0–7), Integrity Check Monitor (ICM) using SHA-256, and on-the-fly AES encryption/decryption for DDR and QSPI memories. The device includes dedicated PLLs: one 600–1200 MHz system PLL, one 480 MHz USB PLL, and a digital fractional audio PLL.

Key Specifications

Pinout & Package

ATSAMA5D21B-CU is housed in a 196-ball Thin Fine-Pitch Ball Grid Array (TFBGA) package measuring 11×11 mm² with 0.75 mm pitch and 0.75 mm thickness. This package supports industrial temperature range (−40°C to +105°C) operation and is optimized for compact, thermally constrained embedded designs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar MPU applications.

Compared with ATSAMA5D22B-CU, ATSAMA5D21B-CU offers lower I/O count but includes AESB and dual CAN-FD-critical for secure industrial gateways. Against ATSAMA5D27B-CU, it trades environmental monitors and extra tamper pins for reduced BOM cost and footprint, making it optimal for volume-constrained POS and HMI applications.

Availability

ATSAMA5D21B-CU is available at Aetrix Electronics and suitable for industrial HMI terminals, secure IoT gateways, and point-of-sale systems requiring stable component supply across long production lifecycles and extended temperature operation.

Supply support for ATSAMA5D21B-CU includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Microchip Technology is a global semiconductor company delivering smart, connected, and secure embedded control solutions, with leadership in 8/16/32-bit MCUs, analog, FPGA, and security ICs.

The SAMA5D2 product line was designed for high-performance, ultra-low-power embedded applications demanding advanced security, rich connectivity, and Linux-capable processing-targeting industrial automation, healthcare, and secure consumer devices.

FAQ

What is the maximum operating frequency of the ATSAMA5D21B-CU?

The ATSAMA5D21B-CU operates at up to 500 MHz using its Arm Cortex-A5 core. This frequency is achievable under typical conditions with appropriate voltage scaling and thermal management. The device includes a 600–1200 MHz system PLL that generates the core clock, and its performance is validated across the industrial temperature range (−40°C to +105°C).

Does the ATSAMA5D21B-CU support secure boot and cryptographic acceleration?

Yes, the ATSAMA5D21B-CU includes a secure bootloader stored in 64-Kbyte scrambled ROM, hardware AES-256/SHA-256/TRNG accelerators, and an Integrity Check Monitor (ICM) that validates memory contents using SHA-256. These features collectively enable authenticated, encrypted boot and runtime protection of firmware and data.

Which memory types does the ATSAMA5D21B-CU support natively?

The ATSAMA5D21B-CU supports DDR2, DDR3L, LPDDR2, LPDDR3, QSPI flash, e.MMC 4.51, SD 3.0, and SLC/MLC NAND flash with up to 32-bit ECC. Its 16-bit DDR bus and integrated memory controller eliminate the need for external PHYs or glue logic in most embedded designs.

How many CAN-FD interfaces does the ATSAMA5D21B-CU provide?

The ATSAMA5D21B-CU integrates two host CAN-FD (MCAN) controllers, each with SRAM-based mailboxes and support for time- and event-triggered transmission. Note that these implement the non-ISO CAN FD frame format and do not pass ISO 16845-1:2016 conformance testing.

What package type and pin count does the ATSAMA5D21B-CU use?

The ATSAMA5D21B-CU uses a 196-ball Thin Fine-Pitch Ball Grid Array (TFBGA) package measuring 11×11 mm² with 0.75 mm pitch. This package is qualified for extended industrial temperature operation (−40°C to +105°C) and is pin-compatible with other SAMA5D21 variants in the same family.