Microchip Technology AT91SAM9G46B-CU

Overview

AT91SAM9G46B-CU from Microchip Technology (formerly Atmel) is an ARM926EJ-S-based embedded microprocessor unit (eMPU) operating at 400 MHz, integrating DDR2/LPDDR and NAND Flash controllers, a 8-channel 10-bit touchscreen ADC, LCD controller supporting up to 1280×860, and dual high-speed USB 2.0 ports with on-chip transceivers. It targets industrial HMI, portable medical devices, and networked edge gateways requiring integrated connectivity and user interface capability.

For engineers reviewing the AT91SAM9G46B-CU datasheet, AT91SAM9G46B-CU pinout, AT91SAM9G46B-CU application, or AT91SAM9G46B-CU equivalent, key selection considerations include its 324-ball TFBGA package with 0.8 mm pitch, independent 1.8 V / 3.3 V I/O voltage domains, hardware AES-256/SHA256 cryptographic accelerators, and support for boot from NAND Flash, SD card, or DataFlash.

Technical Context

The AT91SAM9G46B-CU implements a 133 MHz multi-layer AHB bus matrix with 39 DMA channels, enabling concurrent high-bandwidth transfers between its ARM926EJ-S core, DDR2/LPDDR memory interface, and peripherals including EMAC, ISI, and LCDC. Its memory subsystem includes 64 KB internal SRAM configurable as instruction/data TCM and 64 KB ROM with bootstrap firmware.

Power management integrates clock gating, a battery-backed section with VDDBU supply, and dual PLLs-one system PLL and one 480 MHz USB-optimized PLL-supporting active, standby, and backup modes with sub-µA retention current. All I/Os are independently configurable for 1.8 V or 3.3 V operation, eliminating external level shifters.

Key Specifications

Pinout & Package

The AT91SAM9G46B-CU is housed in a 324-ball TFBGA package (15 × 15 × 1.2 mm, 0.8 mm pitch) with exposed thermal pad. Pin functions are multiplexed across five 32-bit PIO controllers and dedicated peripheral signal groups including DDR2, EBI, USB UTMI+, ISI, LCDC, and EMAC interfaces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ATSAMA5D36-CU and STM32MP157C-DK2, the AT91SAM9G46B-CU delivers lower-cost, single-chip integration for LCD-driven industrial HMIs with resistive touch, while trading off raw CPU performance and modern GPU features for proven reliability and mature Linux BSP support.

Availability

AT91SAM9G46B-CU is available at Aetrix Electronics and suitable for industrial HMI, portable medical monitoring, networked edge gateways, smart energy meters, and embedded vision systems requiring stable component supply and long-term lifecycle assurance.

Supply support for AT91SAM9G46B-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 microcontrollers, analog, FPGA, and memory solutions with focus on reliability, security, and longevity for industrial and automotive markets.

The AT91SAM9G46B-CU belongs to Microchip's SMART ARM9-based eMPU product line, designed specifically for cost-sensitive, high-integration embedded applications requiring rich peripheral sets-including LCD, touchscreen, USB, Ethernet, and hardware cryptography-in a single-package solution.

FAQ

What is the maximum resolution supported by the LCD controller in the AT91SAM9G46B-CU?

The AT91SAM9G46B-CU LCD controller (LCDC) supports TFT and STN displays up to 1280×860 pixels with programmable dot clock, vertical/horizontal sync, and data enable timing. It includes dedicated LCDD[0:23] data bus, LCDVSYNC, LCDHSYNC, and LCDDOTCK outputs, enabling direct interface to common industrial LCD panels without external timing logic.

Does the AT91SAM9G46B-CU support boot from NAND Flash with hardware ECC?

Yes, the AT91SAM9G46B-CU includes a dedicated NAND Flash controller with on-the-fly hardware ECC generation and correction for SLC NAND devices. The ECC engine supports configurable polynomial codes and corrects multi-bit errors per sector, enabling reliable boot and firmware storage directly from NAND without external ECC IC or software overhead.

What are the power supply sequencing requirements for the AT91SAM9G46B-CU?

The AT91SAM9G46B-CU requires strict power-up sequencing: VDDIOP and VDDIOM must reach VIH/VOH within 66 µs and 418 µs respectively after VDDCORE crosses VT+ (1.0 V). VDDOSC, VDDPLL, and VDDUTMII must be stable before VDDCORE ramps. Power-down requires holding NRST active before removing supplies-no specific order among other rails is mandated.

Can the AT91SAM9G46B-CU operate its DDR2 interface and peripheral I/Os at different voltages simultaneously?

Yes, the AT91SAM9G46B-CU supports independent voltage domains: VDDIOM0 (1.65–1.95 V) powers DDR2/LPDDR I/Os, while VDDIOP0/1/2 (1.65–3.6 V) power peripheral I/Os. This allows concurrent 1.8 V DDR2 operation and 3.3 V UART/USB/EMAC signaling without external level shifters, simplifying power design and reducing BOM count.

How many USB ports does the AT91SAM9G46B-CU integrate, and what speeds do they support?

The AT91SAM9G46B-CU integrates two high-speed USB 2.0 ports: one USB Device port (UDPHS) and one USB Host port (UHPHS), both with on-chip UTMI+ transceivers. Each supports full-speed (12 Mbps) and high-speed (480 Mbps) operation. The UHPHS port supports dual-role operation via external switch, enabling flexible host/device configurations in field-deployable equipment.