Microchip Technology AT91SAM9CN12B-CFU

Overview

AT91SAM9CN12B-CFU from Microchip Technology is a 32-bit Arm926EJ-S™-based embedded MPU with secure boot ROM, 400 MHz CPU core, 128 KB on-chip ROM, 32 KB SRAM, and hardware-accelerated AES-256/SHA256 cryptography. It integrates LCD controller, 12-channel 10-bit ADC with resistive touchscreen support, USB 2.0 Full-Speed Host/Device, SDIO, dual SPI, four USARTs, and DDR2/LPDDR/NAND Flash interfaces - deployed in industrial HMI and secure edge gateway applications.

For engineers reviewing the AT91SAM9CN12B-CFU datasheet, AT91SAM9CN12B-CFU pinout, AT91SAM9CN12B-CFU application, or AT91SAM9CN12B-CFU equivalent, key selection criteria include secure boot capability, 217-ball 0.8 mm pitch BGA package compatibility, cryptographic accelerator support for FIPS 197/180-2 compliance, and integrated peripheral mix for human-machine interface and data acquisition systems.

Technical Context

The AT91SAM9CN12B-CFU implements an Arm926EJ-S core with MMU, 16 KB instruction and 16 KB data caches, and runs at up to 400 MHz. Its system bus operates at 133 MHz with eight DMA channels and distributed memory architecture including 32 KB single-cycle SRAM.

It features dedicated hardware accelerators for AES-256, SHA1, and SHA256 with DMA support, plus a NIST SP 800-22–compliant True Random Number Generator (TRNG) and 256-bit fuse bank for crypto key storage. The device supports secure boot via on-chip ROM and includes JTAG disable functionality.

Key Specifications

Pinout & Package

AT91SAM9CN12B-CFU is housed in a 217-ball fine-pitch BGA package (0.8 mm pitch) with exposed thermal pad. Pin functions are organized across four parallel I/O controllers (PIOA–PIOD), EBI, USB, clock, reset, and debug domains. Power rails include VDDCORE (1.05–1.15 V), VDDIOP0/VDDIOP1 (1.65–3.6 V), VDDANA (3.0–3.6 V), VDDUSB (3.0–3.6 V), and VDDBU (battery backup).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT91SAM9X35-CU and i.MX283, the AT91SAM9CN12B-CFU uniquely combines secure boot, on-die crypto acceleration, and resistive touchscreen ADC in a 217-ball BGA - enabling compact, certified secure edge devices without external security co-processors or touch controllers.

Availability

AT91SAM9CN12B-CFU is available at Aetrix Electronics and suitable for industrial HMI terminals, secure edge gateways, medical data loggers, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for AT91SAM9CN12B-CFU 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, FPGA, and connectivity solutions, with deep expertise in secure embedded systems and long-lifecycle industrial components.

The SAM9CN family targets secure, resource-constrained edge applications demanding hardware-enforced trust, cryptographic acceleration, and rich peripheral integration - especially where regulatory compliance (e.g., IEC 62443, FDA) mandates tamper-resistant boot and data protection.

FAQ

What is the maximum operating frequency of the AT91SAM9CN12B-CFU CPU core?

The AT91SAM9CN12B-CFU features an Arm926EJ-S core rated for operation up to 400 MHz. This frequency is sustained under specified voltage (VDDCORE = 1.05–1.15 V) and temperature conditions per the DS60001517A datasheet. System bus speed is independently rated at 133 MHz, decoupled from core frequency via internal clock domain bridging.

Does the AT91SAM9CN12B-CFU support secure boot, and how is it implemented?

Yes, the AT91SAM9CN12B-CFU includes a dedicated secure Boot ROM that enforces cryptographic verification of the first-stage bootloader before execution. This ROM is immutable and leverages the on-chip TRNG and AES engine to validate digital signatures - preventing unauthorized firmware loading. The AT91SAM9CN12B-CFU is the only variant in the SAM9N/CN series with this feature.

Which memory types does the AT91SAM9CN12B-CFU's External Bus Interface support?

The AT91SAM9CN12B-CFU EBI supports DDR2, LPDDR, SDR, LPSDR, NAND Flash (with 24-bit PMECC), and static memories including NOR and PSRAM. It provides 32-bit data width, 26-bit addressing (A0–A25), and dedicated control signals like NCS0–NCS5, NRD, NWR0–NWR3, and NAND-specific lines (NANDALE/NANDCLE).

Can the AT91SAM9CN12B-CFU drive a resistive touchscreen directly, and what ADC resolution is available?

Yes, the AT91SAM9CN12B-CFU integrates a 12-channel, 10-bit successive-approximation ADC with dedicated pins (AD0–AD4) and logic for 4- or 5-wire resistive touchscreen measurement. It supports automatic coordinate acquisition, pen-down detection, and programmable trigger sources - eliminating need for external touch controller ICs.

What package options are available for the AT91SAM9CN12B-CFU, and which one corresponds to this part number?

The AT91SAM9CN12B-CFU is specifically the 217-ball BGA variant with 0.8 mm ball pitch. While the SAM9CN12 family also offers a 247-ball 0.5 mm pitch option, the "B" suffix in AT91SAM9CN12B-CFU denotes the 217-ball package. Pinout, thermal pad configuration, and mechanical dimensions differ between the two packages and are not interchangeable.