SAM3U Series Microcontroller

Atmel’s SAM3U series is the first 32-bit ARM Cortex™-M3 microcontroller with high-speed 480 Mbps USB + Phy

Image of Atmel's SAM3U Series MicrocontrollerWith today’s exponential growth in data rates, system designers demand solutions capable of moving more data faster and more efficiently than ever before. Atmel’s Cortex® M3-based SAM3U delivers high-speed interfaces combined with an innovative high data bandwidth architecture that make it the ideal device for applications with intensive communication requirements.

The 96 MHz SAM3U integrates multiple high-speed peripherals, including an on-chip high-speed USB device and Phy at 480 Mbps. A combination of a 5-layer system bus matrix, 23 DMA channels and distributed memory prevents bottlenecks with minimum processor overhead. With sophisticated power management techniques and an operating voltage down to 1.62V, the SAM3U maximizes battery usage and provides true 1.8V operation. The SAM3U is available in Flash memory densities of 64 K, 128 K and 256 Kbytes with 100- and 144-pin QFP and BGA package options.


High-Speed Bridging

  • The SAM3U is designed to sustain 100+ Mpbs data rates between multiple high-speed peripherals, including HS USB 2.0, SDIO/SDCard 2.0, MMC 4.3, External Bus Interface and SPI.

Data Speedway

  • To exploit the SAM3U’s high-speed communications peripherals fully, the device is built around a high data-bandwidth architecture that enables one to run tasks in parallel and ensures uninterrupted internal and external data flows with minimum processor overhead. The device can be put in backup mode with the core and peripherals powered down, in which power consumption is only 2.5μA.

Safety and Security

  • The SAM3U ensures robust operation thanks to multiple system functions, including a Memory Protection Unit, dual-bank Flash and backup clock mechanism. A 128-bit unique ID enables traceability or seed for encryption.

Low Power Consumption

  • The SAM3U incorporates power management techniques that minimize power consumption under all conditions of use, whether in active mode or low-power modes.

SAM3U Ecosystem

  • Atmel's SAM3U Flash MCU is supported by a rapidly growing number of development tools, real-time operating systems (RTOS), middleware products and technical support services from industry-leading third parties. Atmel provides a dedicated software package for the SAM3U with register descriptions and device drivers for all peripherals, along with project examples that ease the use of the microcontroller.

SAM3U Series Diagram


ImageManufacturer Part NumberDescriptionAvailable Quantity
ATSAM3U2CA-AU datasheet linkIC MCU 32BIT 128KB FLASH 100LQFPATSAM3U2CA-AUIC MCU 32BIT 128KB FLASH 100LQFP4131 - Immediate
ATSAM3U2CA-AU product page link
ATSAM3U2CA-CU datasheet linkIC MCU 32BIT 128KB FLASH 100BGAATSAM3U2CA-CUIC MCU 32BIT 128KB FLASH 100BGA1552 - Immediate
ATSAM3U2CA-CU product page link
ATSAM3U4CA-AU datasheet linkIC MCU 32BIT 256KB FLASH 100LQFPATSAM3U4CA-AUIC MCU 32BIT 256KB FLASH 100LQFP3284 - Immediate
ATSAM3U4CA-AU product page link
ATSAM3U4EA-CU datasheet linkIC MCU 32BIT 256KB FLASH 144BGAATSAM3U4EA-CUIC MCU 32BIT 256KB FLASH 144BGA1071 - Immediate
ATSAM3U4EA-CU product page link
ATSAM3U4EA-AU datasheet linkIC MCU 32BIT 256KB FLASH 144LQFPATSAM3U4EA-AUIC MCU 32BIT 256KB FLASH 144LQFP986 - Immediate
ATSAM3U4EA-AU product page link
ATSAM3U1CB-AU datasheet linkIC MCU 32BIT 64KB FLASH 100LQFPATSAM3U1CB-AUIC MCU 32BIT 64KB FLASH 100LQFP743 - Immediate
ATSAM3U1CB-AU product page link
ATSAM3U2EA-AU datasheet linkIC MCU 32BIT 128KB FLASH 144LQFPATSAM3U2EA-AUIC MCU 32BIT 128KB FLASH 144LQFP264 - Immediate
ATSAM3U2EA-AU product page link
ATSAM3U4CA-CU datasheet linkIC MCU 32BIT 256KB FLASH 100BGAATSAM3U4CA-CUIC MCU 32BIT 256KB FLASH 100BGA781 - Immediate
ATSAM3U4CA-CU product page link
ATSAM3U2EA-CU datasheet linkIC MCU 32BIT 128KB FLASH 144BGAATSAM3U2EA-CUIC MCU 32BIT 128KB FLASH 144BGA289 - Immediate
ATSAM3U2EA-CU product page link
ATSAM3U1CB-CU product page link
ATSAM3U1EB-CU datasheet linkIC MCU 32BIT 64KB FLASH 144BGAATSAM3U1EB-CUIC MCU 32BIT 64KB FLASH 144BGA236 - Immediate
ATSAM3U1EB-CU product page link
ATSAM3U1EB-AU datasheet linkIC MCU 32BIT 64KB FLASH 144LQFPATSAM3U1EB-AUIC MCU 32BIT 64KB FLASH 144LQFP299 - Immediate
ATSAM3U1EB-AU product page link
ATSAM3U1CA-AU datasheet linkIC MCU 32BIT 64KB FLASH 100LQFPATSAM3U1CA-AUIC MCU 32BIT 64KB FLASH 100LQFP150 - Immediate
ATSAM3U1CA-AU product page link
ATSAM3U1CA-CU product page link
ATSAM3U1EA-AU datasheet linkIC MCU 32BIT 64KB FLASH 144LQFPATSAM3U1EA-AUIC MCU 32BIT 64KB FLASH 144LQFP126 - Immediate
ATSAM3U1EA-AU product page link
ATSAM3U1EA-CU datasheet linkIC MCU 32BIT 64KB FLASH 144BGAATSAM3U1EA-CUIC MCU 32BIT 64KB FLASH 144BGA132 - Immediate
ATSAM3U1EA-CU product page link
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Published: 2012-06-29