Overview
The ATSAMD21G18A-AU is a 32-bit ARM® Cortex®-M0+ microcontroller designed for low-power embedded control and IoT applications.
It is widely used in wearable devices, industrial control modules, and smart sensors, where low energy consumption, rich peripherals, and flexible connectivity are required.
As part of the SAM D21 family, the ATSAMD21G18A-AU provides a strong balance between performance and power efficiency. The ATSAMD21G18A-AUT variant offers the same electrical and functional characteristics with a different packaging or delivery format, supporting diverse manufacturing needs.
Core Parameters
| Parameter | Specification |
|---|---|
| Core Architecture | ARM Cortex-M0+ |
| Maximum CPU Speed | 48 MHz |
| Flash Memory | 256 KB |
| SRAM | 32 KB |
| Operating Voltage | 1.62 V to 3.63 V |
| ADC | 12-bit, up to 20 channels |
| Communication Interfaces | USART, SPI, I²C |
| Timers | Multiple 16-/24-bit timers |
| Package | TQFP-48 (AU) |
| Temperature Range | -40°C to +85°C |
These parameters make the device suitable for low-power embedded systems, especially where energy efficiency and peripheral integration are critical.
Features
- ARM Cortex-M0+ core with efficient 32-bit processing
- Ultra-low power consumption with multiple sleep modes
- Integrated 12-bit ADC for precise analog measurement
- Flexible serial communication interfaces
- Rich timer and PWM support
- Pin-compatible options within the SAM D21 family, including ATSAMD21G18A-AUT
Typical Application Scenarios
- IoT nodes and wireless sensor networks
- Wearable and portable electronics
- Industrial automation controllers
- Consumer electronics and smart home devices
- USB-enabled embedded systems
The ATSAMD21G18A-AU is frequently paired with the ATWINC1500 Wi-Fi network controller in IoT designs. While the ATSAMD21G18A-AU handles low-power control and data processing, the ATWINC1500 provides reliable wireless connectivity, together forming a compact and efficient MCU + Wi-Fi solution for connected devices.
Performance Comparison
| Feature | ATSAMD21G18A-AU | 8-bit MCU | Higher-End Cortex-M4 |
|---|---|---|---|
| CPU Architecture | 32-bit Cortex-M0+ | 8-bit | 32-bit Cortex-M4 |
| Power Efficiency | Very High | Medium | Medium |
| Peripheral Integration | High | Low | Very High |
| Cost | Competitive | Low | Higher |
| Development Ecosystem | Strong | Limited | Strong |
Compared with traditional 8-bit microcontrollers, the ATSAMD21G18A-AU delivers higher performance and better scalability, while maintaining lower power consumption than more complex Cortex-M4 devices.
Conclusion
The ATSAMD21G18A-AU is a versatile and energy-efficient microcontroller well suited for modern embedded and IoT designs. With ample memory, rich peripherals, and strong ecosystem support, it provides a reliable solution for both new designs and product upgrades. The ATSAMD21G18A-AUT variant further enhances flexibility for production and sourcing.
For more information and to review our available inventory, please contact our team for detailed pricing, current stock levels, and any additional technical support you may need. View more BLOGS you may be interested as below:
Manufacturer Profile
Microchip Technology is a leading global supplier of microcontrollers, analog, and embedded control solutions. Its SAM series microcontrollers are widely adopted in industrial, consumer, automotive, and IoT applications due to their reliability, long-term availability, and comprehensive development tools.
FAQ
Q1: What is the difference between ATSAMD21G18A-AU and ATSAMD21G18A-AUT?
They share identical electrical and functional specifications. The difference mainly lies in packaging or tape-and-reel delivery format.
Q2: Is ATSAMD21G18A-AU suitable for low-power applications?
Yes. It features multiple sleep modes and ultra-low power operation optimized for battery-powered designs.
Q3: Does this MCU support USB functionality?
Yes. The ATSAMD21G18A-AU includes a full-speed USB device interface.
Q4: How can I verify the quality of ATSAMD21G18A-AU?
7SEtronic follows a complete and standardized quality inspection SOP. Each ATSAMD21G18A-AU unit is inspected through multiple stages, including label verification, visual inspection, and X-ray analysis, to ensure authenticity and reliable quality.
For more information and to review our available inventory, please contact our team for detailed pricing, current stock levels, and any additional technical support you may need.
You can find more component guides and application notes in our Component Technical Guides section: