ATSAMD20J15A-AUT - 48MHz Cortex-M0+ MCU 32KB Flash 64-LQFP | Microchip
MPN: ATSAMD20J15A-AUT β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.2 | $3.20 |
| 10 | $2.85 | $28.50 |
| 100 | $2.4 | $240.00 |
| 500 | $2.1 | $1,050.00 |
| 1,000 | $1.85 | $1,850.00 |
ATSAMD20J15A-AUT Overview
A microcontroller (MCU) is a single-chip computer containing a processor core, program memory (Flash), data memory (SRAM), and integrated peripherals such as timers, communication interfaces, and ADCs. The Cortex-M0+ architecture belongs to the ARM Cortex-M family optimized for embedded applications, offering deterministic interrupt latency, Thumb-2 instruction set, and low power consumption. Microcontrollers sit at the top of the embedded computing hierarchy: transistor -> logic gate -> processor core -> microcontroller -> embedded system. The "low-power" designation reflects sleep modes below 1uA typical, suitable for battery-powered IoT devices.
Key features of the ATSAMD20J15A-AUT include up to 48MHz core clock, 32KB Flash, 4KB SRAM, 6 SERCOM channels (configurable as UART/SPI/I2C), a 12-bit ADC with up to 16 channels, multiple timers (TC, TCC), I2S, USB 2.0 Full-Speed, and a 6-channel peripheral touch controller. The 64-pin LQFP package provides generous GPIO (up to 52 I/O) for breadboard-friendly prototyping and industrial interfaces.
The Cortex-M0+ core uses a von Neumann bus architecture with single-cycle GPIO access, enabling deterministic bit-banging protocols when needed. The Event System allows inter-peripheral signaling without CPU intervention, reducing active mode power and improving real-time responsiveness. The 12-bit ADC delivers up to 350ksps with hardware averaging and oversampling support, and the SERCOM modules can each be independently configured as UART, SPI, I2C, or LIN master, providing flexibility across protocols.
Typical applications include home automation nodes, smart metering, consumer electronics, industrial sensor interfaces, automotive body controllers, and IoT edge devices. The AEC-Q100 qualification of the AUT variant makes it suitable for under-hood and cabin automotive applications where extreme temperatures are encountered.
When designing with this part, ensure the 1.62V-3.63V supply rail is decoupled with a 100nF ceramic capacitor close to each VDD pin. The ATSAMD20J15A-AUT requires Atmel Studio / Microchip Studio or MPLAB X IDE for firmware development, with ASF (Advanced Software Framework) or Harmony 3 drivers available for all peripherals.
This page synthesizes distributor pricing, AEC-Q100 automotive-grade drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone.
Drop-in alternatives for ATSAMD20J15A-AUT β 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 ATSAMD20J15A-AUT (same form factor and footprint) β differing in ADC, Package, SRAM, Operating Temperature, MSL Level.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
ATSAMD20J15A-AU
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD20J15A-ANT
β Drop-Inπ Reference alternative (not in catalog)
ATSAMD20J15A-AN
β Drop-Inβ In Stock
$2.15 / Unit
View Datasheet βATSAMD20J14A-AUT
β Drop-Inβ In Stock
$1.85 / Unit
View Datasheet βATSAMD20G18A-AUT
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$2.84 / Unit
View Datasheet βATSAMD20J15A-AUT Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory | 32 KB (32K x 8) |
| SRAM | 4 KB |
| Supply Voltage Range | 1.62 V to 3.63 V |
| Operating Temperature Range (Automotive) | -40C to +125C (AUT grade) |
| Operating Temperature Range (Industrial) | -40C to +85C |
| Package | 64-LQFP (10x10 mm) |
| GPIO Count | Up to 52 |
| ADC | 12-bit, up to 16 channels, 350 ksps |
| SERCOM Modules | 6 (configurable UART/SPI/I2C) |
| USB | USB 2.0 Full-Speed |
| Peripheral Touch (PTC) | Up to 256 channels |
| AEC-Q100 Qualification | Yes (AUT grade) |
| Mounting Type | Surface Mount |
| MSL Level | 3 |
| CoreMark/MHz | 2.14 |
| RoHS Status | Compliant |
ATSAMD20J15A-AUT Pin Configuration
| Pin 1 | PA00 β GPIO / XIN32 (external 32kHz crystal input) |
| Pin 2 | PA01 β GPIO / XOUT32 (external 32kHz crystal output) |
| Pin 3 | PA02 β GPIO / AIN0 (ADC input) |
| Pin 4 | PA03 β GPIO / AIN1 (ADC input) / VREFA reference voltage |
| Pin 5 | GND β Ground |
| Pin 6 | VDDIO β I/O supply voltage |
| Pin 7 | VDDIN β Voltage regulator input supply |
| Pin 8 | PA04 β GPIO / AIN2 / VREFB reference voltage |
| Pin 9 | PA05 β GPIO / AIN3 |
| Pin 10 | PA06 β GPIO / AIN4 |
| Pin 11 | PA07 β GPIO / AIN5 |
| Pin 12 | PA08 β GPIO / AIN6 / I2S FS |
| Pin 13 | PA09 β GPIO / AIN7 / I2S SCK |
| Pin 14 | PA10 β GPIO / AIN8 / I2S MCK |
| Pin 15 | PA11 β GPIO / AIN9 / I2S SDO |
| Pin 16 | PA12 β GPIO / AIN10 / I2S SDI |
| Pin 17 | PA13 β GPIO |
| Pin 18 | PA14 β GPIO |
| Pin 19 | PA15 β GPIO |
| Pin 20 | PA16 β GPIO / I2C SDA (SERCOM1) |
| Pin 21 | PA17 β GPIO / I2C SCL (SERCOM1) |
| Pin 22 | PA18 β GPIO |
| Pin 23 | PA19 β GPIO |
| Pin 24 | PA20 β GPIO |
| Pin 25 | PA21 β GPIO |
| Pin 26 | PA22 β GPIO |
| Pin 27 | PA23 β GPIO |
| Pin 28 | PA24 β GPIO / USB D- |
| Pin 29 | PA25 β GPIO / USB D+ |
| Pin 30 | GND β Ground |
| Pin 31 | VDDOUT β Voltage regulator output (core supply) |
| Pin 32 | PA26 β GPIO |
| Pin 33 | PA27 β GPIO |
| Pin 34 | PA28 β GPIO / RESET pin (default) |
| Pin 35 | GND β Ground |
| Pin 36 | VDDIO β I/O supply voltage |
| Pin 37 | PA29 β GPIO / BOOT pin |
| Pin 38 | PA30 β GPIO / SWDIO (debug data) |
| Pin 39 | PA31 β GPIO / SWCLK (debug clock) |
| Pin 40 | PB00 β GPIO |
| Pin 41 | PB01 β GPIO |
| Pin 42 | PB02 β GPIO / AIN10 |
| Pin 43 | PB03 β GPIO / AIN11 |
| Pin 44 | PB04 β GPIO / AIN12 |
| Pin 45 | PB05 β GPIO / AIN13 |
| Pin 46 | PB06 β GPIO / AIN14 |
| Pin 47 | PB07 β GPIO / AIN15 |
| Pin 48 | PB08 β GPIO |
| Pin 49 | PB09 β GPIO |
| Pin 50 | PB10 β GPIO |
| Pin 51 | PB11 β GPIO |
| Pin 52 | PB12 β GPIO |
| Pin 53 | PB13 β GPIO |
| Pin 54 | PB14 β GPIO |
| Pin 55 | PB15 β GPIO |
| Pin 56 | PB16 β GPIO |
| Pin 57 | PB17 β GPIO |
| Pin 58 | GND β Ground |
| Pin 59 | VDDIO β I/O supply voltage |
| Pin 60 | VDDIN β Voltage regulator input supply |
| Pin 61 | PA00 β GPIO (alternate) |
| Pin 62 | XIN β External crystal input (primary) |
| Pin 63 | XOUT β External crystal output (primary) |
| Pin 64 | NC β Not connected (per datasheet) |
Typical Applications
ATSAMD20J15A-AUT is suitable for 6 applications: Automotive Body Controllers, Industrial Sensor Interfaces, Smart Home Automation Hubs, Smart Metering Endpoints, Consumer HMI with Touch, Portable Medical Devices.
Automotive Body Controllers
The ATSAMD20J15A-AUT's AEC-Q100 qualification and -40C to +125C operating range make it well-suited for automotive body controllers managing lighting, door modules, seat position, and wiper systems. Its 32KB Flash accommodates CAN/LIN stack plus application logic, while 6 SERCOM channels can be configured as LIN masters for body electronics networking. With 48MHz Cortex-M0+ delivering 2.14 CoreMark/MHz, real-time response is maintained for safety-critical body functions. The 64-LQFP package is breadboard-friendly for prototyping and supports up to 52 GPIO for sensor and actuator interfaces. Compared to general-purpose 32-bit MCUs, the AUT grade's AEC-Q100 stress-test certification (temperature cycling, lifetime simulation, EMC) ensures reliability under hood and cabin thermal stress.
Recommended
Industrial Sensor Interfaces
For industrial 4-20mA loop-powered sensor transmitters and Modbus RTU nodes, the ATSAMD20J15A-AUT delivers the right balance of peripherals and AEC-Q100 reliability margin. Its 12-bit ADC with 16 channels and 350 ksps handles analog sensor conditioning, while the Event System enables hardware-triggered ADC sampling without CPU wake-up. Six SERCOM modules support UART (Modbus), SPI (digital sensor), and I2C (EEPROM calibration) simultaneously. The 1.62V-3.63V supply range allows direct battery or 3.3V regulator operation, and the AUT temperature grade tolerates factory-floor thermal stress. Compared to non-automotive MCUs, the AUT grade's wider temperature window (-40C to +125C) ensures stable operation near motors and heaters.
Recommended
Smart Home Automation Hubs
Smart home Zigbee/Wi-Fi gateway and edge-controller designs leverage the ATSAMD20J15A-AUT's 48MHz processing, 32KB Flash, and 6-channel SERCOM for handling multiple wireless co-processor interfaces. The Peripheral Touch Controller (PTC) supports up to 256 self-capacitance or 192 mutual-capacitance touch buttons/sliders, enabling wall-switch and dimmer designs with no external touch IC. USB 2.0 Full-Speed device mode allows configuration via USB or as a debug probe target. Compared to dedicated touch controllers, the integrated PTC reduces BOM cost and PCB area, while the AUT grade provides automotive-quality reliability margin for long-life consumer installations.
Recommended
Smart Metering Endpoints
Electricity, water, and gas meter endpoint designs benefit from the ATSAMD20J15A-AUT's low-power sleep modes (below 1uA typical in standby), 32KB Flash for metering algorithm and communication stacks, and 64-LQFP package for through-hole-friendly assembly. The 12-bit ADC with hardware oversampling achieves 14-bit effective resolution for accurate power measurement, while SERCOM modules support UART-MBus, SPI-LCD, and I2C-EEPROM simultaneously. The AUT temperature grade ensures meter housings exposed to rooftop or basement temperatures operate reliably. Compared to MSP430-class metering MCUs, the ATSAMD20J15A-AUT provides higher computational throughput and richer peripheral mix at similar cost.
Recommended
Consumer HMI with Touch
Microwave ovens, washing machines, and induction cooktops use the ATSAMD20J15A-AUT for HMI with capacitive touch buttons, segmented LCD or TFT displays, and rotary encoders. The integrated PTC handles touch sensing without external ICs, while SERCOM channels drive SPI displays, I2C sensors, and UART debug. The 32KB Flash holds UI state machines, communication protocols, and touch calibration libraries. The AUT temperature grade enables reliable operation in appliance environments reaching +125C near heat-generating components. Compared to dedicated touch controllers, the integrated PTC saves $4-$6 BOM cost and simplifies PCB layout.
Recommended
Portable Medical Devices
Battery-powered portable medical devices such as pulse oximeters, glucose meters, and digital thermometers use the ATSAMD20J15A-AUT for low-power sensor acquisition and display driving. The Cortex-M0+ at 48 MHz provides sufficient throughput for signal conditioning algorithms, while deep-sleep current below 1uA extends battery life. The 12-bit ADC with 16 channels supports multiple sensor inputs simultaneously, and SERCOM modules handle SPI sensors and I2C peripherals. The AUT automotive-grade temperature range accommodates body-worn devices and rapid disinfection-temperature cycles. Compared to low-end 8-bit MCUs, the ATSAMD20J15A-AUT offers 32-bit performance, USB device connectivity, and richer peripherals at comparable cost.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20J15A-AUT β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20J15A-AU | ATSAMD20J15A-ANT | ATSAMD20J15A-AN | ATSAMD20J14B-MU | ATSAMD20J14A-AUT |
|---|---|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 64-LQFP (10x10 mm) | 64-LQFP - same | 64-TQFP - same pinout | 64-LQFP - same | 64-QFN - different footprint | 64-LQFP - same |
| Core Architecture | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Maximum Clock Frequency | 48 MHz (32 MHz at full AEC-Q100 range) | 48 MHz | 32 MHz | 48 MHz | 48 MHz | 32 MHz |
| Flash Memory | 32 KB | 32 KB | 32 KB | 32 KB | 16 KB (-50%) | 16 KB (-50%) |
| SRAM | 4 KB | 4 KB | 4 KB | 4 KB | 2 KB | 2 KB |
| AEC-Q100 Qualification | Yes (AUT grade) | No (industrial grade) | Yes | No | No | Yes |
| Operating Temperature Range | -40C to +125C | -40C to +85C | -40C to +125C | -40C to +105C | -40C to +85C | -40C to +125C |
| USB 2.0 Full-Speed | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- AEC-Q100 qualified automotive grade (vs ATSAMD20J15A-AU)
- Full 48 MHz operation across industrial temperature range (vs ATSAMD20J15A-ANT)
- Pin-compatible upgrade path to 256KB Flash variant (vs ATSAMD20G18A-AUT)
Design Notes
Decouple each VDD/VDDIO/VDDIN pin with a 100nF ceramic capacitor placed within 2mm of the pin, plus a bulk 4.7uF tantalum or ceramic capacitor on VDDIN. The internal LDO regulates VDDIN down to VDDOUT (1.2V core supply); do not load VDDOUT externally. For battery applications, route VDDIN directly from the battery and use the internal LDO for low quiescent current (typically <1uA in backup mode).
At 48 MHz active with all peripherals enabled, the ATSAMD20J15A-AUT draws approximately 9 mA from VDDIN (1.8V supply worst case 12 mA). Power dissipation is roughly 16 mW at 1.8V - negligible thermal concern for LQFP-64 (theta_JA approximately 65 C/W). However, in automotive AEC-Q100 temperature range (-40C to +125C), ensure the LQFP exposed pad (if applicable) is soldered to a copper pour for optimal heat spreading during sustained 32 MHz operation.
Route the SWDIO (PA30) and SWCLK (PA31) signals as a matched pair with ground shielding for reliable debug access. Place a 4.7kΞ© pull-up on the RESET/PA28 pin. If using the external 32.768 kHz crystal for RTC, keep traces short and surround with ground; load capacitors (typically 7-12 pF) must match the crystal manufacturer's CL specification. For USB, route D+ (PA25) and D- (PA24) as a 90-ohm differential pair with characteristic impedance matching.
Do not exceed 3.63V on any VDD pin - the SAM D20 family is NOT 5V tolerant. When migrating between AUT (32 MHz max) and AU (48 MHz) variants, verify that your clock configuration generator (e.g., ASF clock_init) matches the target variant's maximum rating. The SERCOM peripheral pads can each be mapped to multiple GPIO pins via the MUX system; missing the right pinmux configuration is a common source of "dead peripheral" debugging sessions.
When using the Peripheral Touch Controller (PTC), ensure adjacent touch sensors have proper ground shielding and avoid routing digital signals (PWM, SERCOM) directly across touch electrodes. The PTC charge-transfer measurement is sensitive to noise; a 100nF decoupling capacitor adjacent to AVDD/VDDANA pins is essential. For high-impedance analog inputs, add a small series resistor (100 ohm) at the ADC pin to limit peak current during ESD strikes.
Compliance Information
AEC-Q100 qualified automotive grade per SAM D20 datasheet (Atmel-42129J). RoHS and REACH compliance per Microchip product page. Halogen-free status not explicitly confirmed - verify with Microchip support for specific lot requirements.
