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Microchip Technology ATSAMR21G16A-MUT
- Part No.:
- ATSAMR21G16A-MUT
- Manufacturer:
- Microchip Technology
- Category:
- RF Transceiver ICs
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
ATSAMR21G16A-MUT.pdf
- Description:
- IC RF TXRX+MCU ISM>1GHZ 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
ATSAMR21G16A-MUT from Microchip Technology (formerly Atmel) is a 32-bit ARM Cortex-M0+ wireless microcontroller integrating an ultra-low-power 2.4GHz ISM band transceiver, 64KB Flash, 8KB SRAM, and full-speed USB 2.0 interface. It operates at up to 48MHz, supports SleepWalking peripherals, and targets battery-powered IoT sensor nodes requiring secure, low-latency 250kb/s RF communication.
For engineers reviewing the ATSAMR21G16A-MUT datasheet, ATSAMR21G16A-MUT pinout, ATSAMR21G16A-MUT application, or ATSAMR21G16A-MUT equivalent, this page delivers verified technical context, validated pin functions for QFN48, real-world use cases in smart metering and industrial sensing, and two confirmed alternative parts with documented functional trade-offs.
Technical Context
The ATSAMR21G16A-MUT implements a single-core ARM Cortex-M0+ processor with Micro Trace Buffer (MTB), DFLL48M and FDPLL96M clock generators, and a hardware-assisted MAC layer tightly coupled to its integrated 2.4GHz transceiver. Its Event System enables inter-peripheral signaling without CPU intervention, even in standby mode.
It features three 16-bit Timer/Counters (TC) and three 16-bit Timer/Counters for Control (TCC), supporting cascaded 32-bit timing, synchronized PWM generation, and deterministic fault protection. The 12-channel DMAC and SERCOM modules (up to five configurable as USART/I²C/SPI/LIN) provide flexible peripheral connectivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| CPU Core | ARM Cortex-M0+, 48MHz max - delivers 2.14 CoreMark/MHz efficiency for deterministic real-time control. |
| Memory | 64KB Flash / 8KB SRAM - sufficient for Zigbee/Thread stack + application logic in compact edge-node firmware. |
| RF Transceiver | 2.4GHz ISM band, 250kb/s data rate, -99dBm RX sensitivity, +4dBm TX output - meets IEEE 802.15.4-2006 PHY requirements. |
| Power Management | Idle & standby sleep modes; SleepWalking peripherals wake clocks autonomously - extends coin-cell battery life to multi-year operation. |
| Analog Peripherals | 8-channel 12-bit ADC (350ksps), two analog comparators, Peripheral Touch Controller (48-channel) - enables direct sensor interfacing and capacitive UI without external components. |
| Package & Environment | QFN48 (7×7 mm), -40°C to +85°C industrial grade, MSL3 - suitable for automated SMT assembly and harsh environmental deployment. |
| USB Interface | Full-speed (12Mbps) USB 2.0 with embedded host/device capability and 8 endpoints - supports firmware updates and HID-class device enumeration. |
Pinout & Package
ATSAMR21G16A-MUT is housed in a 48-pin QFN package (7×7 mm, 0.5 mm pitch) with an exposed thermal pad internally connected to GND. The pad must be soldered to PCB ground for mechanical stability and thermal performance; it is not a substitute for dedicated GND pins.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| PA00 / PA01 | XIN32 / XOUT32 | 32.768kHz crystal oscillator inputs - enable RTC calendar accuracy and low-power wake-up timing. |
| PA14 / PA15 | XTAL1 / XTAL2 | 16MHz crystal for RF transceiver - provides precise frequency reference for 2.4GHz carrier synthesis. |
| PA24 / PA25 | USB_DP / USB_DM | Differential USB 2.0 data lines - support device enumeration, firmware download, and host-mode peripheral attachment. |
| PA30 / PA31 | SWCLK / SWDIO | Two-pin Serial Wire Debug interface - enables non-intrusive on-chip debugging and flash programming. |
| RFP / RFN | RF differential antenna interface | 50Ω matched RF outputs - connect directly to balun or matching network for 2.4GHz ISM band transmission. |
| GND (Pins 1,13,14,20,29,35,42) | Digital/analog ground | Multiple dedicated GND pins minimize noise coupling between digital, analog, and RF domains. |
Key Features
| Feature | Design Value |
|---|---|
| Hardware-assisted MAC | Auto-acknowledge and auto-retry reduce host CPU overhead and improve packet delivery reliability in mesh networks. |
| SleepWalking peripherals | Peripherals (e.g., ADC, TC, RTC) execute predefined tasks autonomously in standby mode - eliminates CPU wake-ups for periodic sampling. |
| Event System (12 channels) | Enables zero-latency, CPU-free signal routing between peripherals (e.g., TC trigger ADC conversion) - critical for deterministic timing in motor control. |
| TCC timer units (3 × 16-bit) | Support complementary PWM outputs with configurable dead-time and dithering - enables precise gate drive for BLDC motor inverters. |
| Integrated security | AES encryption engine and True Random Number Generator (TRNG) - provide hardware-accelerated cryptographic primitives for secure boot and OTA updates. |
Applications
| Smart Utility Metering | Industrial Wireless Sensor Node |
|---|---|
|
Use Scenario: Battery-powered gas/water meter transmitting consumption data hourly via mesh network. IC Role / Device Role / Timing Role: Primary system-on-chip handling sensor acquisition, RF packet assembly, AES-encrypted transmission, and ultra-low-power sleep scheduling. Use Value: Integrated transceiver and SleepWalking eliminate external RF IC and reduce BOM count; 64KB Flash accommodates DLMS/COSEM protocol stack. |
Use Scenario: Vibration and temperature monitoring node on rotating machinery with predictive maintenance analytics. IC Role / Device Role / Timing Role: Real-time data acquisition hub synchronizing multi-axis accelerometer sampling with TCC-triggered ADC conversions. Use Value: Hardware Event System links TC timers to ADC start-of-conversion, ensuring jitter-free sampling at 1kHz without CPU intervention. |
| Home Automation Gateway | Capacitive Touch Remote Control |
|
Use Scenario: Sub-GHz/Zigbee-to-WiFi bridge aggregating signals from multiple end devices in residential environments. IC Role / Device Role / Timing Role: Dual-role USB device/host managing local firmware updates and upstream cloud connectivity while hosting Zigbee coordinator stack. Use Value: Full-speed USB 2.0 with embedded host capability allows direct connection to cellular/WiFi modules - no external USB hub required. |
Use Scenario: Energy-harvesting remote with touch slider and button controls for lighting systems. IC Role / Device Role / Timing Role: Capacitive touch controller with proximity detection and low-power wake-on-touch event generation. Use Value: 48-channel PTC supports complex UI layouts; SleepWalking wakes CPU only when valid touch gesture completes - extends solar cell runtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar wireless microcontroller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ATSAMR21G18A-MUT | 256KB Flash / 32KB SRAM vs. 64KB / 8KB - 4× more memory for larger protocol stacks or local data buffering. | Required for Thread 1.2 or Matter over Thread deployments needing >128KB application space. | Select when firmware complexity exceeds 64KB or future-proofing for feature expansion is mandatory. |
| STM32WBA52CGU6 | Arm Cortex-M33 core, Bluetooth LE 5.3 radio, 256KB Flash, TrustZone security - different RF standard and higher security assurance level. | Preferred for BLE mesh applications or where PSA Certified Level 2 security is mandated by regulatory bodies. | Choose for Bluetooth-centric designs or certified secure boot requirements; not drop-in compatible due to RF stack and pinout differences. |
Compared with ATSAMR21G16A-MUT, ATSAMR21G18A-MUT offers scalable memory for evolving protocols, while STM32WBA52CGU6 shifts focus to BLE and hardware-enforced security - both require board-level redesign but address distinct connectivity and compliance mandates.
Availability
ATSAMR21G16A-MUT is available at Aetrix Electronics and suitable for smart metering, industrial wireless sensor networks, and home automation gateways requiring stable component supply across multi-year production cycles.
Supply support for ATSAMR21G16A-MUT includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology acquired Atmel in 2016 and maintains the SMART ARM-based microcontroller portfolio, emphasizing low-power, integrated wireless solutions for industrial and IoT markets.
The SAM R21 product line was designed specifically for battery-operated IEEE 802.15.4-compliant edge nodes, combining RF transceiver, MCU, and power-efficient peripherals in a single die to minimize system footprint and bill-of-materials cost.
FAQ
What is the maximum operating frequency and core architecture of the ATSAMR21G16A-MUT?
The ATSAMR21G16A-MUT features an ARM Cortex-M0+ processor core rated for up to 48MHz operation. It achieves 2.14 CoreMark/MHz efficiency and includes a single-cycle hardware multiplier and Micro Trace Buffer (MTB) for real-time code execution profiling. This core architecture enables deterministic real-time response in resource-constrained IoT applications while maintaining ultra-low power consumption.
Does the ATSAMR21G16A-MUT include an integrated RF transceiver, and what are its key RF specifications?
Yes, the ATSAMR21G16A-MUT integrates an ultra-low-power 2.4GHz ISM band transceiver compliant with IEEE 802.15.4-2006. Key RF specs include 250kb/s data rate, -99dBm receiver sensitivity, +4dBm programmable transmit output power, hardware-assisted MAC (auto-acknowledge/auto-retry), and 128-byte TX/RX frame buffers. It requires an external 16MHz crystal (XTAL1/XTAL2) for RF clock synthesis.
What package type and pin count does the ATSAMR21G16A-MUT use, and are there thermal considerations?
The ATSAMR21G16A-MUT uses a 48-pin QFN package (7×7 mm, 0.5 mm pitch) with an exposed thermal pad connected to GND. Its junction-to-ambient thermal resistance (θJA) is 33°C/W. For reliable operation above 65°C ambient, ensure adequate PCB copper pour under the thermal pad and verify junction temperature using TJ = TA + (θJA × PD), where PD is actual power dissipation.
How many USB endpoints and what USB speed does the ATSAMR21G16A-MUT support?
The ATSAMR21G16A-MUT supports full-speed (12Mbps) USB 2.0 operation with eight configurable endpoints. It implements both device and embedded host functionality, enabling direct connection to USB peripherals like cellular modems or flash drives without external USB host controllers. Endpoint configuration is managed via the USB Device Stack in firmware.
What low-power features does the ATSAMR21G16A-MUT offer for battery-operated applications?
The ATSAMR21G16A-MUT supports two software-selectable sleep modes: idle (CPU halted, peripherals active) and standby (all clocks stopped except selected wake sources). Its SleepWalking capability allows peripherals like RTC, ADC, or TC to operate autonomously in standby mode and wake the CPU only upon threshold crossing or result readiness - extending typical coin-cell battery life to 5+ years in sensor polling applications.
ATSAMR21G16A-MUT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- SMART™ SAM R21
- Package/Case:
- 48-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Programmable:
- Not Verified
- Type:
- TxRx + MCU
- RF Family/Standard:
- General ISM > 1GHz
- Protocol:
- -
- Modulation:
- O-QPSK
- Frequency:
- 2.4GHz
- Data Rate (Max):
- 250kbps
- Power - Output:
- 4dBm
- Sensitivity:
- -99dBm
- Memory Size:
- 64kB Flash, 8kB SRAM
- Serial Interfaces:
- I2C, SPI, UART, USART, USB
- GPIO:
- 28
- Voltage - Supply:
- 1.8V ~ 3.6V
- Current - Receiving:
- 11.3mA ~ 11.8mA
- Current - Transmitting:
- 7.2mA ~ 13.8mA
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Supplier Device Package:
- 48-QFN (7x7)
ATSAMR21G16A-MUT FAQ
1.How can I place an order for ATSAMR21G16A-MUT through Aetrix?
Please submit a Request for Quotation (RFQ) for ATSAMR21G16A-MUT on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ATSAMR21G16A-MUT reliable?
The price and inventory of ATSAMR21G16A-MUT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ATSAMR21G16A-MUT is usually 5 days.
3.What payment methods are accepted for ATSAMR21G16A-MUT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ATSAMR21G16A-MUT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ATSAMR21G16A-MUT?
ATSAMR21G16A-MUT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ATSAMR21G16A-MUT order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ATSAMR21G16A-MUT?
For technical support, including ATSAMR21G16A-MUT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ATSAMR21G16A-MUT requirements.
6.How does Aetrix verify that ATSAMR21G16A-MUT is sourced from the original manufacturer or authorized distributors?
All ATSAMR21G16A-MUT products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ATSAMR21G16A-MUT meets industry standards.
7.What is the process for return or replacement of ATSAMR21G16A-MUT?
All ATSAMR21G16A-MUT units undergo pre-shipment inspection (PSI). If there is an issue with ATSAMR21G16A-MUT, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ATSAMR21G16A-MUT part is unused and in its original packaging.
Return procedure for ATSAMR21G16A-MUT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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