ATSAMD20J16A-CN - 48MHz Cortex-M0+ MCU 64KB Flash | Microchip
MPN: ATSAMD20J16A-CN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.65 | $26.50 |
| 100 | $2.4 | $240.00 |
| 500 | $2.18 | $1,090.00 |
| 1,000 | $1.95 | $1,950.00 |
ATSAMD20J16A-CN Overview
A microcontroller (MCU) is a single-chip computer that integrates a CPU core, non-volatile program memory (Flash), volatile working memory (SRAM), and configurable peripherals onto one silicon die. The Cortex-M0+ core, designed by Arm, is the smallest and most energy-efficient of the Cortex-M family, optimized for deterministic interrupt response and minimal gate count. Within the broader taxonomy, the ATSAMD20J16A-CN sits inside the SAM D20 family -> 32-bit MCU -> microcontroller -> embedded processor -> semiconductor, providing the system-on-chip foundation for connected and battery-powered products.
Key features of the ATSAMD20J16A-CN include six SERCOM-configurable serial channels, a 12-bit 350 ksps analog-to-digital converter (ADC) with up to 20 channels, a 10-bit 350 ksps digital-to-analog converter (DAC), a 16-bit timer/counter, and a full-speed USB 2.0 device interface (note: USB pins are not bonded out on the 64-pin UFBGA variant). It also provides a Real-Time Clock (RTC) with calendar mode, up to 52 general-purpose I/O pins, and a Peripheral Touch Controller supporting buttons, sliders, and proximity sensing via capacitive sensing.
The device is fabricated on a low-power CMOS process and offers multiple sleep modes (IDLE, STANDBY, BACKUP) with typical RTC backup current around 1 µA, enabling years of operation from a single coin cell when duty-cycled. The integrated 32.768 kHz oscillator and PLL-derived 48 MHz system clock let designers trade computational throughput against quiescent draw on a per-application basis, while the Single-Voltage 1.6 V to 3.6 V supply range simplifies direct battery connection.
Typical applications for the ATSAMD20J16A-CN include home automation nodes, low-power IoT sensor endpoints, consumer electronics such as wearables and remote controls, smart metering, and industrial sensor front-ends. Its mix of low-power sleep modes, robust ADC, and configurable SERCOM blocks suits designs where BOM consolidation and long battery life outweigh raw throughput.
When designing with this part, take care to populate the decoupling network recommended in the datasheet and verify the chosen boot configuration strap pins (BOOTPROT/PMUX) match your in-system programmer flow. The 64-ball UFBGA requires careful PCB layout with microvia or via-in-pad technology for reliable assembly on inner layers.
This page synthesizes distributor pricing tiers, drop-in alternatives, and practical design notes not found in the standalone manufacturer datasheet, giving engineers a single reference for evaluation, sourcing, and PCB integration decisions.
Drop-in alternatives for ATSAMD20J16A-CN — 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 ATSAMD20J16A-CN (same form factor and footprint) — differing in ADC, Core Architecture, DAC, Package, Peripheral Touch Controller (PTC).
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAMD20J18A-UUT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATSAMD20J17A-UUT
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
ATSAMD20J16A-CN Maximum Ratings & Electrical Characteristics
| Core Architecture | ARM Cortex-M0+ (32-bit) |
| Series | SAM D20J |
| Maximum CPU Clock | 48 MHz |
| Program Memory (Flash) | 64 KB |
| Data Memory (SRAM) | 8 KB |
| Supply Voltage (VDD) | 1.6 V to 3.6 V |
| Operating Temperature | -40C to +105C (industrial) |
| Package | 64-ball UFBGA (5x5 mm) |
| Mounting Type | Surface Mount |
| GPIO Count | Up to 52 |
| ADC | 12-bit, up to 350 ksps, up to 20 channels |
| DAC | 10-bit, 350 ksps |
| Communication Interfaces | 6x SERCOM (I2C/SPI/UART), I2S |
| Peripheral Touch Controller (PTC) | Yes |
| Timers | 16-bit TC, 32-bit TC, RTC |
| RoHS Status | Compliant (per distributor listing, GREEN) |
ATSAMD20J16A-CN 64-ball ufbga (5x5 mm) Pin Configuration Guide
Pin configuration for ATSAMD20J16A-CN (64-ball ufbga (5x5 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 ATSAMD20J16A-CN.
Refer to the datasheet for full pin configuration.
Typical Applications
ATSAMD20J16A-CN is suitable for 6 applications: Battery-Powered IoT Sensor Nodes, Home Automation Control Panels, Wearable Fitness and Health Devices, Smart Metering Endpoints, Industrial Sensor Front-Ends, Consumer Remote Controls and HID Devices.
Battery-Powered IoT Sensor Nodes
The ATSAMD20J16A-CN fits IoT sensor nodes where 1.6 V to 3.6 V direct battery connection eliminates the need for an external LDO. The Cortex-M0+ core runs at up to 48 MHz with 64 KB Flash / 8 KB SRAM - sufficient for FreeRTOS-based sensor-fusion stacks. STANDBY sleep currents in the single-digit microamp range, combined with the integrated 12-bit ADC and 6 SERCOM channels, let designers stream temperature/humidity/accelerometer data over I2C or SPI for years on a single CR2032 coin cell.
Recommended
Home Automation Control Panels
Smart-home control panels benefit from the ATSAMD20J16A-CN's mix of capacitive touch and serial connectivity. The Peripheral Touch Controller (PTC) supports up to 20 buttons or a slider/wheel directly through PCB copper, eliminating mechanical switches, while 6 SERCOM channels drive RS-485, UART, SPI displays, and I2C sensors simultaneously. Designers can drive a small TFT or OLED via SPI for status feedback, and the 8 KB SRAM comfortably holds the GUI buffer plus a Modbus or Zigbee stack.
Recommended
Wearable Fitness and Health Devices
Wearable designs choose the ATSAMD20J16A-CN for its 5x5 mm UFBGA footprint and ARM Cortex-M0+ efficiency. The 12-bit ADC at 350 ksps captures photoplethysmography (PPG) and bioimpedance signals, while the PTC enables seamless touch-based UI on watch bezels. With deep-sleep currents around 1 µA and a fast 1.5 µs wake-up from STANDBY, the part supports always-on heart-rate monitoring while preserving multi-day battery life on a 100 mAh Li-Po cell.
Recommended
Smart Metering Endpoints
Utility metering endpoints rely on the ATSAMD20J16A-CN's low-power RTC and robust ADC. The internal RTC with calendar mode timestamps energy, water, or gas readings even in BACKUP mode with sub-microamp draw. The 12-bit ADC with differential inputs directly samples current shunts or analog front-ends from metering ICs. AES hardware accelerator and secure boot on the D20 family suit encrypted data logging for tamper-evident metering applications.
Recommended
Industrial Sensor Front-Ends
Industrial 4-20 mA loop-powered sensors leverage the ATSAMD20J16A-CN's wide 1.6 V to 3.6 V supply range and 105 °C industrial temperature rating. The 12-bit ADC digitizes bridge sensors, RTDs, or thermistors with ±1 LSB INL, while SERCOM ports drive SPI isolators and RS-485 transceivers. Hardware PTC reduces component count by replacing mechanical buttons in harsh environments, and the 64-ball UFBGA package is rated for industrial humidity and conformal coating per JEDEC J-STD-020.
Recommended
Consumer Remote Controls and HID Devices
TV remotes, presentation clickers, and game controllers use the ATSAMD20J16A-CN because the on-chip PTC supports capacitive buttons, sliders, and proximity wake-up without external touch ICs. The Cortex-M0+ core at 48 MHz easily drives BLE pairing sequences via an external module, and STANDBY current of ~1 µA means an AAA battery lasts the shelf life of the product. 64 KB Flash holds rich HID descriptor tables plus vendor-specific firmware updates over USB or BLE OTA.
Recommended
Recommended Products Summary
Engineering reference data for ATSAMD20J16A-CN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAMD20J18A-UUT | ATSAMD20J17A-UUT | ATSAMD20J15A-CU | ATSAMD20J16A-MN |
|---|---|---|---|---|---|
| Package | 64-ball UFBGA (5x5 mm) | 64-ball UFBGA (5x5 mm) - same | 64-ball UFBGA (5x5 mm) - same | 48-ball UFBGA - different | 64-pin QFN - different |
| Brand | Microchip Technology | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same | Microchip Technology - same |
| Core | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ | ARM Cortex-M0+ |
| Max Clock Speed | 48 MHz | 48 MHz | 48 MHz | 48 MHz | 48 MHz |
| Flash Memory | 64 KB | 256 KB | 128 KB | 32 KB | 64 KB |
| SRAM | 8 KB | 32 KB | 16 KB | 4 KB | 8 KB |
| Supply Voltage | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V | 1.6 V to 3.6 V |
| USB Support | No (DP/DM not bonded) | No (UFBGA package) | No (UFBGA package) | No (48-pin) | Yes (USB DP/DM bonded) |
Key Differentiators
- Compact 5x5 mm UFBGA with PTC capacitive touch (vs ATSAMD20J16A-MN (QFN-64))
- Highest memory density at the 64-ball UFBGA tier (vs ATSAMD20J15A-CU (48-ball UFBGA, 32 KB Flash))
- ARM Cortex-M0+ at 48 MHz with 6 SERCOM peripherals (vs PIC16F series 8-bit MCUs)
Design Notes
The 64-ball UFBGA at 0.5 mm pitch requires microvia or via-in-pad PCB technology for reliable assembly. Per IPC-7351 and Microchip application note AN2547, design the land pattern with NSMD (non-solder mask defined) pads of 0.30 mm diameter, with microvias (0.10/0.20 mm) tented or filled-and-plated-over. Conventional through-hole vias will not fit in the 0.5 mm-pitch grid and attempting to route escape traces between balls without microvias leads to solder shorts during reflow. Plan at minimum a 4-layer stack-up with a dedicated ground plane under the BGA.
Place one 0.1 µF X7R decoupling capacitor as close as possible to every VDD and VDDIO ball pair, plus a bulk 4.7 µF X5R capacitor on the main VDD rail. The SAM D20 datasheet section 39 (Typical Application) recommends keeping the ground return path short and avoiding shared ground impedance between analog (AVDD) and digital (VDDIO) supplies. Add a 10 µF tantalum or ceramic on VBUS if USB is in use; for battery-powered designs, add a 10 µF reservoir on VDD to absorb transmit-current spikes from radios co-located on the board.
Do not assume USB works on the ATSAMD20J16A-CN - the UFBGA package variant does not bond out DP/DM, so the USB peripheral remains in reset. Engineers needing USB must migrate to the ATSAMD20J16A-MN (QFN-64) or larger packages. Another common pitfall is failing to populate the 32.768 kHz crystal load capacitors: the SAM D20 internal load caps must be configured via FUSES, or external 12.5 pF caps must be added, or the RTC will drift several seconds per hour. Always check the NVM User Row settings (FUSES) at production programming.
Compliance Information
RoHS and REACH compliance per Microchip product declaration; GREEN / Pb-free per Mouser listing. Not AEC-Q100 qualified - this is a commercial/industrial-grade part. For automotive designs, consider ATSAMx20x16A-AUT variants with AEC-Q100 Grade 2 qualification.
