Microchip Technology ATSAMA5D21C-CU

Overview

ATSAMA5D21C-CU from Microchip Technology is an ultra-low-power Arm Cortex-A5-based microprocessor unit (MPU) operating at up to 500 MHz, integrating a 128-Kbyte configurable L2 cache, TrustZone security, AES/SHA/TRNG crypto accelerators, and a 12-channel 12-bit ADC with resistive touchscreen support. It supports DDR2/DDR3L/LPDDR2/LPDDR3, QSPI, e.MMC, and NAND Flash, and targets secure industrial HMI, IoT edge gateways, and point-of-sale terminals requiring real-time connectivity and tamper resistance.

For engineers reviewing the ATSAMA5D21C-CU datasheet, ATSAMA5D21C-CU pinout, ATSAMA5D21C-CU application, or ATSAMA5D21C-CU equivalent, this page delivers verified technical context, exact package mapping (196-ball TFBGA, 11×11 mm, 0.75 mm pitch), confirmed low-power modes (ULP0/ULP1/Backup), validated peripheral set (1 × EMAC, 2 × QSPI, 5 × FLEXCOM, 2 × CAN-FD), and two documented alternative MPUs for functional migration paths.

Technical Context

The ATSAMA5D21C-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 integrates two 16-channel 64-bit Central DMA controllers and dedicated peripheral DMAs to sustain high-bandwidth transfers without CPU intervention.

Security is enforced via hardware-enforced TrustZone isolation, on-the-fly AES encryption/decryption for DDR and QSPI memories (AESB), Integrity Check Monitor (ICM) using SHA-256, and 5-Kbyte scrambled SRAM with tamper-detection erasure. The device supports IEEE 802.1AS timestamping, AVB traffic shaping (IEEE 802.1Qav), and PTP v2 for deterministic Ethernet timing.

Key Specifications

Pinout & Package

ATSAMA5D21C-CU is housed in a 196-ball Thin Fine-Pitch Ball Grid Array (TFBGA) package measuring 11×11 mm² with 0.75 mm ball pitch and 0.75 mm thickness. This package supports 72 general-purpose I/O lines, each configurable for up to eight peripheral functions including UART, SPI, TWI, PWM, and ADC inputs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATSAMA5D21C-CU, ATSAMA5D22C-CU offers greater I/O density and LCD resolution support but omits AESB; ATSAMA5D27C-CU adds extended temperature qualification and environmental monitoring at the cost of larger footprint and higher BOM cost - choice depends on security, thermal, and interface requirements.

Availability

ATSAMA5D21C-CU is available at Aetrix Electronics and suitable for industrial HMI terminals, secure IoT gateways, and point-of-sale systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing from authorized channels.

Supply support for ATSAMA5D21C-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 leading provider of microcontrollers, analog components, and Flash-IP solutions, with deep expertise in secure embedded systems and industrial-grade reliability.

The SAMA5D2 series was designed specifically for secure, ultra-low-power Linux-capable applications in industrial automation, IoT edge nodes, and human-machine interfaces - emphasizing hardware-enforced security, deterministic real-time performance, and energy efficiency.

FAQ

What is the maximum operating frequency of the ATSAMA5D21C-CU?

The ATSAMA5D21C-CU operates at a maximum CPU frequency of 500 MHz. This is achieved using the internal 600–1200 MHz system PLL, with the core clock derived via programmable dividers. The device maintains full functionality-including DDR interface, crypto acceleration, and peripheral operation-at this rated speed under typical thermal conditions, as validated in Microchip's DS60001476H datasheet.

Does the ATSAMA5D21C-CU support CAN FD, and what are its limitations?

Yes, the ATSAMA5D21C-CU integrates two MCAN controllers supporting CAN FD frame formats. However, Microchip explicitly states that these implement the *non-ISO* CAN FD format and do not pass the ISO 16845-1:2016 conformance test. Therefore, ATSAMA5D21C-CU is suitable for proprietary or vendor-specific CAN FD networks but not for ISO-standard automotive or industrial CAN FD deployments requiring formal compliance certification.

What package type and dimensions does the ATSAMA5D21C-CU use?

The ATSAMA5D21C-CU uses a 196-ball Thin Fine-Pitch Ball Grid Array (TFBGA) package measuring 11×11 mm² with 0.75 mm ball pitch and 0.75 mm thickness. This package is documented in Table 1-1 and Figure 3-1 of the DS60001476H datasheet and is distinct from the 256-ball and 289-ball variants used by other SAMA5D2 family members.

Which memory types does the ATSAMA5D21C-CU support natively?

The ATSAMA5D21C-CU natively supports DDR2, DDR3L, LPDDR2, LPDDR3, QSPI NOR Flash, e.MMC 4.51, SD 3.0, and SLC/MLC NAND Flash with up to 32-bit BCH ECC. Its 16-bit DDR bus is optimized for cost-sensitive industrial designs, and the QSPI interface enables XIP (execute-in-place) operation for fast boot and reduced RAM footprint - all confirmed in the "Memory Architecture" section of DS60001476H.

How does the ATSAMA5D21C-CU implement hardware security for secure boot?

The ATSAMA5D21C-CU implements secure boot via a 64-Kbyte scrambled and maskable ROM containing a hardened bootloader, TrustZone-enforced isolation between secure/non-secure worlds, and integrity checking via the SHA-256-based Integrity Check Monitor (ICM). Upon reset, the ROM bootloader verifies the digital signature of the first-stage application code before loading it into secure RAM - a process detailed in Microchip's SAMA5D2 Series Secure Boot Strategy document.