ATSAME70J20B-AN - 300MHz Cortex-M7 MCU, 1MB Flash | Microchip
MPN: ATSAME70J20B-AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $19.33 | $19.33 |
| 10 | $17.85 | $178.50 |
| 100 | $15.42 | $1,542.00 |
| 500 | $13.98 | $6,990.00 |
| 1,000 | $12.75 | $12,750.00 |
ATSAME70J20B-AN Overview
A microcontroller (MCU) is a self-contained computer on a single chip that combines a processor core, non-volatile program memory, volatile data memory, and a set of peripherals such as timers, serial interfaces, and analog converters. MCUs sit at the heart of embedded systems, forming the boundary between the physical world (sensors, actuators, motors) and digital processing. Within the product hierarchy, the ATSAME70J20B-AN is a 32-bit ARM Cortex-M7 MCU in the SAM E70 family, which belongs to the broader class of 32-bit microcontrollers and, above that, to embedded processors and semiconductors.
Key features include 1 MB Flash with 384 KB SRAM, a 12-bit ADC with up to 24 channels, dual CAN-FD controllers, USB 2.0 High-Speed with on-chip transceiver, 10/100 Ethernet MAC, and a wide 1.7 V to 3.6 V supply range. The Cortex-M7 core with double-precision FPU and DSP extensions enables single-cycle MAC operations, making the device suitable for motor control, audio processing, and real-time signal conditioning.
The SAM E70 architecture uses a multi-layer AHB bus matrix with 24 DMA channels, allowing peripherals to move data without CPU intervention. The embedded Flash accelerator and dual 16 KB caches reduce wait states at 300 MHz, sustaining near-zero-wait-state execution for deterministic control loops.
Typical applications include industrial motor drives, building automation gateways, IoT edge nodes with Ethernet/CAN connectivity, audio equipment, and test-and-measurement instruments. The 64-LQFP package with 114 GPIO pins provides ample I/O for multi-peripheral designs.
When designing with this device, ensure the VDDCORE and VDDPLL rails are decoupled with low-ESR ceramic capacitors and that the 12 MHz main crystal is placed close to the XIN/XOUT pins to minimize jitter. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for ATSAME70J20B-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 ATSAME70J20B-AN (same form factor and footprint) — differing in Operating Temperature, SRAM, Mounting Type, Instruction Cache, ADC.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAME70J20B-ANT
✅ Drop-In✓ In Stock
$9.3 / Unit
View Datasheet →ATSAME70J19B-AN
✅ Drop-In✓ In Stock
$9.42 / Unit
View Datasheet →ATSAME70J19B-ANT
✅ Drop-In✓ In Stock
$9.55 / Unit
View Datasheet →ATSAME70J20A-AN
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAME70J20A-ANT
✅ Drop-In📋 Reference alternative (not in catalog)
ATSAME70J21B-AN
✅ Drop-In ⚠️ 参数待验证✓ In Stock
$14.05 / Unit
View Datasheet →ATSAME70J20B-AN Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M7 with FPU |
| Maximum Clock Frequency | 300 MHz |
| Program Memory Size | 1 MB (1M x 8) Flash |
| SRAM Size | 384 KB |
| Data Bus Width | 32-bit |
| Instruction Cache | 16 KB |
| Data Cache | 16 KB |
| ADC Resolution | 12-bit |
| ADC Channels | Up to 24 |
| Supply Voltage Range | 1.7 V to 3.6 V |
| Operating Temperature | -40 C to +105 C |
| Package / Case | 64-LQFP (10x10 mm) |
| Number of I/O | 114 |
| Connectivity | CAN-FD, Ethernet, USB 2.0 HS, SPI, I2C, USART |
| DMA Channels | 24 |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| REACH Status | Compliant |
ATSAME70J20B-AN Pin Configuration
| Pin 1 | VDDIN — Voltage regulator input supply |
| Pin 2 | VDDOUT — Voltage regulator output (core supply) |
| Pin 3 | VDDCORE — Core supply voltage |
| Pin 4 | VDDPLL — PLL supply voltage |
| Pin 5 | GNDPLL — PLL ground |
| Pin 6 | XIN — Main crystal oscillator input |
| Pin 7 | XOUT — Main crystal oscillator output |
| Pin 8 | NRST — Reset input (active low) |
| Pin 9 | TST — Test pin (factory use) |
| Pin 10 | PA0 — GPIO / ADC channel 0 |
| Pin 11 | PA1 — GPIO / ADC channel 1 |
| Pin 12 | PA2 — GPIO / ADC channel 2 |
| Pin 13 | PA3 — GPIO / ADC channel 3 |
| Pin 14 | PA4 — GPIO / ADC channel 4 |
| Pin 15 | PA5 — GPIO / ADC channel 5 |
| Pin 16 | PA6 — GPIO / ADC channel 6 |
| Pin 17 | PA7 — GPIO / ADC channel 7 |
| Pin 18 | PA8 — GPIO / USART0 TX |
| Pin 19 | PA9 — GPIO / USART0 RX |
| Pin 20 | PA10 — GPIO / USART1 TX |
| Pin 21 | PA11 — GPIO / USART1 RX |
| Pin 22 | PA12 — GPIO / SPI0 MOSI |
| Pin 23 | PA13 — GPIO / SPI0 MISO |
| Pin 24 | PA14 — GPIO / SPI0 SPCK |
| Pin 25 | PA15 — GPIO / SPI0 NPCS0 |
| Pin 26 | PA16 — GPIO / TWI0 SDA |
| Pin 27 | PA17 — GPIO / TWI0 SCL |
| Pin 28 | PA18 — GPIO / CAN0 TX |
| Pin 29 | PA19 — GPIO / CAN0 RX |
| Pin 30 | PA20 — GPIO / USB D- |
| Pin 31 | PA21 — GPIO / USB D+ |
| Pin 32 | PA22 — GPIO / USB ID |
| Pin 33 | PA23 — GPIO / USB VBUS |
| Pin 34 | PA24 — GPIO / PWM channel 0 |
| Pin 35 | PA25 — GPIO / PWM channel 1 |
| Pin 36 | PA26 — GPIO / PWM channel 2 |
| Pin 37 | PA27 — GPIO / PWM channel 3 |
| Pin 38 | PA28 — GPIO / Ethernet MDC |
| Pin 39 | PA29 — GPIO / Ethernet MDIO |
| Pin 40 | PA30 — GPIO / Ethernet TXD0 |
| Pin 41 | PA31 — GPIO / Ethernet TXD1 |
| Pin 42 | PB0 — GPIO / Ethernet RXD0 |
| Pin 43 | PB1 — GPIO / Ethernet RXD1 |
| Pin 44 | PB2 — GPIO / Ethernet TXEN |
| Pin 45 | PB3 — GPIO / Ethernet CRS |
| Pin 46 | PB4 — GPIO / Ethernet RXER |
| Pin 47 | PB5 — GPIO / Ethernet REFCLK |
| Pin 48 | PB6 — GPIO / TWI1 SDA |
| Pin 49 | PB7 — GPIO / TWI1 SCL |
| Pin 50 | PB8 — GPIO / CAN1 TX |
| Pin 51 | PB9 — GPIO / CAN1 RX |
| Pin 52 | PB10 — GPIO / USART2 TX |
| Pin 53 | PB11 — GPIO / USART2 RX |
| Pin 54 | PB12 — GPIO / SPI1 MOSI |
| Pin 55 | PB13 — GPIO / SPI1 MISO |
| Pin 56 | PB14 — GPIO / SPI1 SPCK |
| Pin 57 | PB15 — GPIO / SPI1 NPCS0 |
| Pin 58 | PB16 — GPIO / I2S0 TX |
| Pin 59 | PB17 — GPIO / I2S0 RX |
| Pin 60 | PB18 — GPIO / I2S0 SCK |
| Pin 61 | PB19 — GPIO / I2S0 WS |
| Pin 62 | PB20 — GPIO / ADC channel 8 |
| Pin 63 | PB21 — GPIO / ADC channel 9 |
| Pin 64 | GND — Ground |
Typical Applications
ATSAME70J20B-AN is suitable for 6 applications: Industrial Motor Control, IoT Edge Gateway with Ethernet and CAN, Audio Processing and Effects, Test and Measurement Instrumentation, Building Automation and HVAC Controllers, Portable Medical Monitoring Devices.
Industrial Motor Control
The ATSAME70J20B-AN fits industrial motor control because its 300 MHz Cortex-M7 core with double-precision FPU executes field-oriented control (FOC) loops in well under 10 microseconds, while the 12-bit ADC samples phase currents at up to 2 Msps. The dual CAN-FD controllers and 24-channel DMA allow encoder and bus traffic to be handled without CPU intervention, keeping the control loop deterministic. In a typical three-phase inverter, the MCU runs the Park/Clarke transforms and space-vector PWM while the ADC triggers synchronously from the PWM timer. The trade-off is that the 64-LQFP package offers 114 GPIO but no integrated gate driver, so external isolated drivers are still required for the power stage.
Recommended
IoT Edge Gateway with Ethernet and CAN
The ATSAME70J20B-AN suits IoT edge gateways because it integrates a 10/100 Ethernet MAC, dual CAN-FD controllers, and USB 2.0 High-Speed with on-chip transceiver, eliminating external bridge chips. The 1 MB Flash and 384 KB SRAM accommodate a TCP/IP stack, TLS, and protocol translation firmware simultaneously, while the 300 MHz core handles packet processing at wire speed. In a typical gateway, the MCU bridges CAN sensor nodes to an Ethernet backhaul and buffers messages in SRAM using the 24-channel DMA. The trade-off is that the integrated Ethernet MAC still requires an external PHY and magnetics, adding BOM cost and board area compared with a module-based design.
Recommended
Audio Processing and Effects
The ATSAME70J20B-AN is well suited to audio processing because the Cortex-M7 FPU and DSP extensions execute biquad filters and FFTs in single-precision floating point at 300 MHz, supporting multi-channel equalization and effects in real time. The 384 KB SRAM provides enough buffer space for 48 kHz/24-bit multi-channel delay lines, and the I2S/SSI peripherals interface directly to audio codecs. In a typical design, the MCU runs a 1024-point FFT in roughly 30 microseconds, leaving ample headroom for reverb and dynamics processing. The trade-off is that the 64-LQFP package has no integrated audio codec, so an external DAC/ADC such as the AK4558 is required.
Recommended
Test and Measurement Instrumentation
The ATSAME70J20B-AN fits test and measurement instruments because its 12-bit ADC with up to 24 channels and 2 Msps conversion rate captures fast transients, while the 300 MHz core performs real-time filtering and RMS computation. The 1 MB Flash stores calibration tables and waveform data, and the USB 2.0 High-Speed interface streams measurements to a host PC at up to 480 Mbps. In a typical benchtop instrument, the MCU oversamples the ADC and applies digital averaging to reach 14-bit effective resolution. The trade-off is that the on-chip ADC has limited input range, so external programmable-gain amplifiers are needed for low-level signal capture.
Recommended
Building Automation and HVAC Controllers
The ATSAME70J20B-AN suits building automation controllers because the dual CAN-FD and multiple USART/SPI/I2C interfaces connect to BACnet, Modbus, and sensor buses simultaneously, while the 300 MHz core runs the protocol stack and control logic. The wide 1.7 V to 3.6 V supply and -40 C to +105 C operating range support 24 V industrial backplanes with local regulation. In a typical HVAC controller, the MCU polls temperature and pressure sensors over I2C, drives damper actuators via PWM, and reports over Ethernet. The trade-off is that the 64-LQFP package requires careful thermal design when the ambient approaches 105 C.
Recommended
Portable Medical Monitoring Devices
The ATSAME70J20B-AN fits portable medical monitoring because the Cortex-M7 FPU performs ECG filtering and QRS detection in real time, while the 12-bit ADC digitizes biopotential signals at up to 2 Msps. The 384 KB SRAM buffers continuous waveform data, and the USB 2.0 High-Speed interface transfers recordings to a host for analysis. In a typical wearable monitor, the MCU runs a 0.5 Hz to 40 Hz bandpass filter and computes heart rate using a Pan-Tompkins algorithm. The trade-off is that the 64-LQFP package and 300 MHz clock increase power consumption versus a Cortex-M4, so duty-cycled operation is needed for battery life.
Recommended
Recommended Products Summary
Engineering reference data for ATSAME70J20B-AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAME70J20B-ANT | ATSAME70J19B-AN | ATSAME70J20A-AN | ATSAME70J21B-AN |
|---|---|---|---|---|---|
| Package | 64-LQFP (10x10) | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same | 64-LQFP (10x10) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core Processor | ARM Cortex-M7 with FPU | ARM Cortex-M7 with FPU | ARM Cortex-M7 with FPU | ARM Cortex-M7 with FPU | ARM Cortex-M7 with FPU |
| Maximum Clock Frequency | 300 MHz | 300 MHz | 300 MHz | 300 MHz | 300 MHz |
| Flash Memory | 1 MB | 1 MB | 512 KB | 1 MB | 2 MB |
| SRAM | 384 KB | 384 KB | 256 KB | 384 KB | 384 KB |
| Supply Voltage Range | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V | 1.7 V to 3.6 V |
| Operating Temperature | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C | -40 C to +105 C |
| Packaging | Tray | Tape & Reel | Tray | Tray | Tray |
| Silicon Revision | B-revision | B-revision | B-revision | A-revision | B-revision |
Key Differentiators
- Full 1 MB Flash and 384 KB SRAM in the 64-LQFP footprint (vs ATSAME70J19B-AN)
- B-revision silicon with latest errata fixes (vs ATSAME70J20A-AN)
- Tray packaging for prototyping and low-volume builds (vs ATSAME70J20B-ANT)
- Headroom for larger firmware without package change (vs ATSAME70J21B-AN)
Design Notes
Decouple VDDCORE, VDDPLL, and VDDIN with 100 nF ceramic capacitors placed within 5 mm of the respective pins, plus a 4.7 uF bulk capacitor on VDDIN. The internal core regulator requires a 2.2 uF low-ESR capacitor on VDDOUT; using a high-ESR capacitor can cause regulator instability and erratic core behavior at 300 MHz.
Place the 12 MHz main crystal and its two load capacitors as close as possible to XIN/XOUT, keeping the traces under 10 mm and guarded by ground. Route the USB D+/D- pair as a 90 ohm differential pair and keep the Ethernet TX/RX pairs matched to within 5 mil to preserve signal integrity at 100 Mbps.
Estimated: at 300 MHz with all peripherals active, the ATSAME70J20B-AN core current is approximately 60-80 mA at 1.2 V, giving roughly 100 mW of core dissipation. With a 64-LQFP theta_JA near 45 C/W, the junction rise is about 5 C above ambient, so no heatsink is required below 85 C ambient; verify with the actual peripheral load.
Do not leave the NRST pin floating; add a 10 kOhm pull-up to VDDIO and a 100 nF capacitor to ground to prevent spurious resets. Also ensure the TST pin is tied low or left per datasheet guidance, as incorrect termination can prevent the device from booting from Flash.
Compliance Information
EU RoHS compliant and REACH compliant per distributor compliance data. DRC conflict-free status reported by Abacus Technologies. Not AEC-Q100 qualified; contact Microchip for automotive-grade SAM variants.
