Microchip Technology AT91SAM9CN12-CFUR

Overview

AT91SAM9CN12-CFUR from Microchip Technology is a 32-bit ARM926EJ-S-based embedded MPU with secure boot ROM, 256-bit AES/SHA256 hardware crypto accelerators, 128 KB ROM, 32 KB SRAM, and support for DDR2/LPDDR and NAND Flash. It integrates LCD controller, resistive touchscreen interface, dual USB (Host/Device), SDIO, multiple UARTs/SPI/I²C, and a 12-channel 10-bit ADC - deployed in industrial HMIs and secure edge gateways.

For engineers reviewing the AT91SAM9CN12-CFUR datasheet, AT91SAM9CN12-CFUR pinout, AT91SAM9CN12-CFUR application, or AT91SAM9CN12-CFUR equivalent, key selection considerations include secure boot enforcement, on-chip TRNG and PMECC for NAND reliability, 105 GPIOs with configurable I/O voltage (1.8V/3.3V), and BGA217 0.8 mm pitch package compatibility with industrial layout constraints.

Technical Context

The AT91SAM9CN12-CFUR implements an Arm926EJ-S core running at up to 400 MHz with MMU, 16 KB instruction and 16 KB data caches, and a 133 MHz multi-layer AHB bus matrix backed by eight DMA channels. Its system architecture includes dual PLLs (system + USB-optimized), programmable clock outputs, and a dedicated backup section with 32 kHz RC oscillator and four 32-bit GPBRs.

Cryptographic functionality is hardware-accelerated via dedicated AES-256/192/128 and SHA-1/SHA256 engines compliant with FIPS 197 and FIPS 180-2, coupled with an NIST SP 800-22–compliant True Random Number Generator. Secure boot is enforced by a dedicated Boot ROM that validates signature before executing user code from external memory.

Key Specifications

Pinout & Package

AT91SAM9CN12-CFUR is packaged in a 217-ball BGA with 0.8 mm pitch, RoHS-compliant and green-qualified. The package supports industrial thermal profiles and high-density PCB routing.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT91SAM9X35-CU and ATSAMA5D36-CU, the AT91SAM9CN12-CFUR uniquely delivers certified hardware crypto, secure boot enforcement, and NAND PMECC in a cost-optimized ARM9 footprint - making it optimal for resource-constrained, security-critical industrial endpoints where certification and long-term NAND reliability are non-negotiable.

Availability

AT91SAM9CN12-CFUR is available at Aetrix Electronics and suitable for industrial HMIs, secure edge gateways, medical device controllers, and ruggedized data loggers requiring stable component supply across extended product lifecycles.

Supply support for AT91SAM9CN12-CFUR 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 microcontrollers, analog, FPGA, and security solutions with emphasis on reliability, longevity, and embedded control.

The SAM9CN series targets secure, low-power industrial and medical applications requiring certified cryptography, tamper-resistant boot, and long-lifecycle support - distinguishing it from general-purpose MPUs.

FAQ

What is the primary security feature differentiating AT91SAM9CN12-CFUR from AT91SAM9N12?

The AT91SAM9CN12-CFUR includes a secure Boot ROM that enforces cryptographic signature validation before executing external code, whereas the AT91SAM9N12 uses only a standard Boot ROM. Additionally, AT91SAM9CN12-CFUR integrates hardware AES-256/SHA256 accelerators and a NIST SP 800-22–compliant TRNG - features absent in AT91SAM9N12. These capabilities make AT91SAM9CN12-CFUR suitable for FIPS 140-2 Level 1–compliant designs.

Does AT91SAM9CN12-CFUR support DDR2 memory, and what is the maximum data rate?

Yes, AT91SAM9CN12-CFUR supports DDR2 memory via its 32-bit External Bus Interface with dedicated DDR2/LPDDR controller. It operates at up to 133 MHz system bus frequency, enabling sustained DDR2-266 (133 MHz clock, 266 MT/s) operation with full command/address/control signal support including DQS, DQM, and differential SDCK. The controller also supports LPDDR for ultra-low-power modes.

How many USB interfaces does AT91SAM9CN12-CFUR provide, and are external PHYs required?

AT91SAM9CN12-CFUR provides two independent USB interfaces: one Full-Speed USB Device port and one Full-Speed USB Host port, each with integrated on-chip transceivers. No external PHY is required - HDP/HDM (host) and DDP/DDM (device) pins connect directly to USB connectors. Both ports support standard USB 2.0 FS signaling and are electrically compliant without additional components.

What package type and ball count does AT91SAM9CN12-CFUR use?

AT91SAM9CN12-CFUR uses a 217-ball fine-pitch BGA package with 0.8 mm ball pitch, RoHS-compliant and qualified for industrial temperature range (–40°C to +85°C). This package is distinct from the 247-ball 0.5 mm variant and is explicitly designated in the CFUR suffix per Microchip's ordering nomenclature.

Can AT91SAM9CN12-CFUR execute Linux, and what memory configuration is recommended?

Yes, AT91SAM9CN12-CFUR is qualified to run Linux (e.g., Yocto Project, Buildroot) using its Arm926EJ-S core, MMU, and 32 KB SRAM. A typical configuration pairs it with 128 MB DDR2 and 512 MB NAND Flash (with PMECC enabled). The 128 KB ROM contains a validated bootstrap loader, and the 32 KB SRAM serves as initial stack and kernel decompression buffer - eliminating need for external SRAM in most deployments.