ATSAME70N21B-AN - 300MHz Cortex-M7 MCU 2MB Flash | Microchip
MPN: ATSAME70N21B-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $18.45 | $18.45 |
| 10 | $16.92 | $169.20 |
| 100 | $14.75 | $1,475.00 |
| 500 | $13.2 | $6,600.00 |
| 1,000 | $11.85 | $11,850.00 |
ATSAME70N21B-AN Overview
An ARM Cortex-M7 microcontroller is a high-end 32-bit MCU core from Arm's Cortex-M family, designed for deterministic real-time control with DSP and SIMD capabilities. It sits above Cortex-M4 in the taxonomy: Cortex-M7 -> Cortex-M4 -> Cortex-M3 -> Cortex-M0, occupying the top tier of the mainstream MCU performance curve. It belongs to the broader category of embedded microcontrollers (MCU), within the integrated circuits hierarchy (MCU -> microcontroller -> semiconductor). SAME70 devices add high-speed peripherals including HS USB, Ethernet, CAN-FD, and image sensor interfaces, integrating them with the M7 core into a system-on-chip suitable for industrial, automotive aftermarket, and IoT gateway applications.
Key features include 2 MB Flash with ECC, 384 KB SRAM, dual 16-channel 12-bit 2 MSPS ADCs, high-speed USB with integrated PHY, 10/100 Ethernet MAC with 1588 PTP support, CAN-FD, up to 144 GPIO, and integrated image sensor interface (ISI). The device supports 1.62V to 3.6V core supply with separate I/O voltage domains and offers industrial-grade -40C to +85C operation. Hardware cryptographic accelerators (AES, TRNG) and secure boot features provide platform integrity.
The SAME70 architecture couples a 16 KB ICache and 16 KB DCache to the AXI bus, dramatically accelerating Flash execution and reducing wait states at 300 MHz. The peripheral DMA (PDMIC, XDMAC) supports scatter-gather transfers, while the Event System enables low-latency inter-peripheral signaling without CPU intervention. The Floating Point Unit is single and double precision IEEE 754 compliant, accelerating motor control and audio DSP math.
Typical applications include industrial motor drives, PLC controllers, IoT gateways with Ethernet, automotive aftermarket telematics, and high-resolution industrial imaging. Designers also deploy the ATSAME70N21B-AN in HVAC controllers, point-of-sale terminals, and medical instrumentation front-ends.
When designing with this MCU, ensure the 1.2V core rail is supplied by an LDO rated for at least 250 mA peak, and that decoupling is placed adjacent to every VDD pin. The high-speed USB and Ethernet PHYs require impedance-controlled routing and proper ground stitching for EMI compliance.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone, including SAME70 family cross-references and bench-tested power consumption figures.
Drop-in alternatives for ATSAME70N21B-AN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAME70N21B-AN (same form factor and footprint) — differing in ADC, Operating Temperature, Package, USB, SRAM.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAME70N20A-AN
✅ Drop-In✓ In Stock
$11.2 / Unit
View Datasheet →ATSAMV71Q21B-AN
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAMS70N20A-AN
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAME70N21B-AN Maximum Ratings & Electrical Characteristics
| Core | ARM Cortex-M7 with FPU |
| Maximum Clock Frequency | 300 MHz |
| CoreMark Performance | 1500 CoreMark |
| DMIPS Performance | 750 DMIPS |
| Program Flash Memory | 2 MB (2048 KB) |
| SRAM | 384 KB |
| Instruction Cache | 16 KB |
| Data Cache | 16 KB |
| Supply Voltage (VDDIO) | 1.62 V to 3.6 V |
| Supply Voltage (VDDCORE) | 1.2 V (typical) |
| Operating Temperature | -40 C to +85 C |
| Package | 100-LQFP (14x14 mm) |
| Mounting Type | Surface Mount |
| ADC | Dual 12-bit, 2 MSPS, up to 16 channels |
| Communication | HS USB, 10/100 Ethernet, CAN-FD, UART, SPI, TWI |
| RoHS Status | Compliant |
ATSAME70N21B-AN 100-lqfp (14x14 mm) Pin Configuration Guide
Pin configuration for ATSAME70N21B-AN (100-lqfp (14x14 mm) package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for ATSAME70N21B-AN.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAME70N21B-AN is suitable for 8 applications: Industrial Motor Control Drives, IoT Edge Gateway with Ethernet, Automotive Aftermarket Telematics, Industrial Machine Vision Systems, PLC and Process Controllers, Medical Instrumentation Front-End, Audio DSP and Sound Processing, Robotics and Drone Flight Controllers.
Industrial Motor Control Drives
The ATSAME70N21B-AN fits industrial motor drives due to its 300 MHz Cortex-M7 performance with double-precision FPU, enabling field-oriented control (FOC) algorithms at switching frequencies up to 20 kHz with single-cycle math. Its dual 12-bit 2 MSPS ADCs simultaneously sample phase currents and DC bus voltage, while the built-in PWM timers deliver complementary outputs with hardware dead-time insertion. The 384 KB SRAM accommodates control loops plus telemetry logging without external memory.
Recommended
IoT Edge Gateway with Ethernet
The ATSAME70N21B-AN powers IoT edge gateways thanks to its integrated 10/100 Ethernet MAC with hardware IEEE 1588 PTP timestamping, enabling sub-microsecond time synchronization for distributed sensor networks. The 2 MB Flash hosts full TLS-enabled TCP/IP stacks like lwIP or netX, while the 384 KB SRAM holds packet buffers and JSON parsing contexts. Its HS USB port connects to Wi-Fi or LTE modems for uplink, with CAN-FD bridging to industrial networks.
Recommended
Automotive Aftermarket Telematics
The ATSAME70N21B-AN suits automotive telematics head units with CAN-FD supporting modern vehicle bus standards up to 5 Mbps, processing OBD-II and proprietary OEM payloads in real time. Its 300 MHz Cortex-M7 with 384 KB SRAM runs data logging, GPS fusion algorithms, and BLE/Wi-Fi gateway code on a single chip. Industrial -40C to +85C operation handles under-dash thermal environments; for AEC-Q100 needs use the V71Q21B variant.
Recommended
Industrial Machine Vision Systems
The ATSAME70N21B-AN's integrated Image Sensor Interface (ISI) directly captures parallel camera streams up to WVGA resolution, while its 300 MHz Cortex-M7 with hardware SIMD performs edge detection, color conversion, and JPEG encoding at frame rates above 30 fps. The 384 KB SRAM doubles as a framebuffer, eliminating external SDRAM for cost-sensitive designs. Real-time Ethernet output streams results to PLC supervisors.
Recommended
PLC and Process Controllers
Programmable Logic Controllers benefit from the ATSAME70N21B-AN's Cortex-M7 deterministic interrupt latency, hardware AES, and EtherCAT/Modbus/Profinet-capable Ethernet. Its 144 GPIO handles dozens of discrete I/O plus encoder inputs through the AFEC (analog front-end) channels and TC capture modules. The 2 MB Flash supports IEC 61131-3 runtime plus application ladder logic with 384 KB SRAM as working memory.
Recommended
Medical Instrumentation Front-End
Medical devices such as portable patient monitors use the ATSAME70N21B-AN to interface with multiple ADCs and sensors while running signal conditioning, FFT analysis, and touchscreen UI concurrently. Its hardware AES plus TRNG supports HIPAA-compliant encryption of patient data at rest and in transit over Ethernet or USB. The Cortex-M7 DSP extensions accelerate biosignal filtering in patient-side firmware without external DSP chips.
Recommended
Audio DSP and Sound Processing
Audio processors and smart speakers leverage the ATSAME70N21B-AN's double-precision FPU and SIMD DSP to run beamforming, noise cancellation, and parametric EQ on multiple microphone channels in real time. Its HS USB supports class-compliant USB audio, while S/PDIF or I2S peripherals interface with external DACs. The 384 KB SRAM buffers multi-channel audio streams at 48 kHz with low latency under 5 ms.
Recommended
Robotics and Drone Flight Controllers
Drones and robotic platforms use the ATSAME70N21B-AN as the central flight/motion controller, processing 6-axis IMU data at 1 kHz with the Cortex-M7's hardware FPU running extended Kalman filter pose estimation. Its high-speed timers generate precise PWM at up to 24 MHz resolution for ESC motor control, while CAN-FD interfaces to companion boards like payload cameras or servos. Ethernet MAC enables telemetry downlink for high-bandwidth sensor data.
Recommended
Recommended Products Summary
Engineering reference data for ATSAME70N21B-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME70N20A-AN | ATSAMV71Q21B-AN | ATSAMS70N20A-AN |
|---|---|---|---|---|
| Package | 100-LQFP (14x14 mm) | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same | 100-LQFP (14x14) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M7 300 MHz | ARM Cortex-M7 300 MHz | ARM Cortex-M7 300 MHz | ARM Cortex-M7 300 MHz |
| Flash Memory | 2 MB | 2 MB | 2 MB | 2 MB |
| SRAM | 384 KB | 384 KB | 384 KB | 384 KB |
| Ethernet MAC | Yes (10/100, IEEE 1588) | Yes (10/100, IEEE 1588) | Yes (10/100, IEEE 1588) | No (no EMAC) |
| HS USB PHY | Yes (integrated) | Yes (integrated) | Yes (integrated) | No (no USB) |
| CAN-FD | Yes | Yes | Yes | Yes |
| Operating Temperature | -40C to +85C (industrial) | -40C to +85C | -40C to +105C (automotive) | -40C to +85C |
| AEC-Q100 | Not qualified | Not qualified | Qualified (automotive grade) | Not qualified |
Key Differentiators
- Latest N21B silicon revision with CAN-FD (vs ATSAME70N20A-AN)
- Automotive AEC-Q100 qualification (vs ATSAMV71Q21B-AN)
- Integrated HS USB with PHY (vs ATSAMS70N20A-AN)
Design Notes
Estimated: The ATSAME70N21B-AN draws approximately 200 mA peak at 300 MHz with all peripherals active, requiring a 1.2V LDO rated at least 250 mA on the VDDcore rail. Microchip recommends the MIC69502 or equivalent low-noise LDO with output tolerance under 2%. Decouple each VDDIO pin with 100 nF + 4.7 uF ceramic and provide bulk capacitance at the regulator output. Power-on reset requires VDDIO to ramp monotonically with no dropouts during MCU boot.
Use a 4-layer PCB with continuous ground plane directly under the 100-LQFP for thermal dissipation and signal reference. Route the HSUSB differential pair (D+/D-) with 90 ohm differential impedance, max length 50 mm, and avoid stubs. Place the 12 MHz crystal within 5 mm of XIN/XOUT pins with grounded guard traces. The image sensor interface data lines should be length-matched to within 1 mm across all 8/10/12 bits to prevent capture timing skew.
Keep the analog supply AVSS separately routed to a clean ground point, and isolate ADC reference decoupling on its own ground island connected at a single point to digital ground. The 100-LQFP exposed pad (if present, depends on package variant) should be soldered to a thermal pad with 9 thermal vias to inner ground plane for heatsinking at high ambient temperatures. Maintain 4 mm trace clearance between Ethernet magnetics and noisy switching nodes.
Do not enable the Brown-Out Detector (BOD) thresholds lower than 1.62V without ensuring the VDDIO regulator has adequate transient response. Programming via SWD requires the ERASE pin pulled high during reset to enter bootloader; forgetting this is a common bring-up issue. The N21B silicon revision has updated errata compared to N20A - consult DS80000721 before locking down firmware. The HSUSB VBUS pin needs 5V tolerant protection against shorts per USB 2.0 specification.
Compliance Information
RoHS and REACH compliant per Microchip product declaration. Standard E70N21B is not AEC-Q100 - choose V71Q21B variant for automotive. Lead-free matte tin plating.
