A31L221AR

The A31L221AR is an ultra-low power 32-bit microcontroller based on the ARM Cortex-M0+ core, offering 16 Kbytes of Flash and 4 Kbytes of SRAM. Designed for embedded control and battery-sensitive applications, it combines a compact 16‑pin TSSOP package with on-chip peripherals for analog sensing, timing, communication and low-power real-time operation.

With a 1.71 V to 3.6 V supply range and an operating temperature of −40 °C to +105 °C, the A31L221AR targets IoT, sensor and handheld designs that require efficient processing, integrated analog front-end and multiple serial interfaces.

Key Features

• Core ARM Cortex-M0+ 32-bit core running up to 32 MHz for deterministic control and efficient code execution.
• Memory 16 Kbytes of on-chip Flash and 4 Kbytes of SRAM with a 32‑byte backup register for code, data and minimal state retention.
• Power and Low-Power Modes Wide supply range (1.71 V to 3.6 V) with ultra-low power modes: 78 μA/MHz in RUN, 10 μA in low-frequency RUN, 0.99 μA in DEEP SLEEP with RTCC and retention, 0.3 μA in DEEP SLEEP with power control, and 36 nA in SHUT DOWN (DEEP SLEEP mode 3). Fast wakeup (≈5 μs).
• Timers and RTC Four multi-purpose 16-bit timers plus a Real Time Clock and Calendar (RTCC) and a 24-bit Watchdog Timer for reliable timekeeping and supervisory functions.
• Analog and Sensors 12-bit ADC (6 channels) and two comparators with an integrated temperature sensor for sensor interfacing and analog monitoring.
• Serial Interfaces Multiple serial peripherals including I2C (up to 1 Mbps), SPI (up to 16 Mbps), USART/UART and LPUART for flexible peripheral connectivity and protocol support.
• System and Reliability CRC generator (8/16/32-bit), POR/LVR/LVI protections, clock monitoring, SWD debug interface, 128-bit unique ID and USART ISP support for secure boot and robust system validation.
• Package and Environment 16‑pin TSSOP surface-mount package, 13 programmable I/O pins, and operating temperature range from −40 °C to +105 °C for industrial-grade deployments.

Typical Applications

• IoT Sensors and Gateways — Sensor data acquisition and local processing using the 12-bit ADC, comparators and low-power RTCC for duty-cycled operation.
• Battery-Powered Handhelds — Low standby and deep-sleep currents with fast wakeup support responsive UIs and long battery life.
• Alarm and Detector Modules — Analog monitoring and comparator thresholds combined with watchdog supervision for reliable detection and safety applications.
• Wireless Module Controllers (e.g., NB‑IoT front ends) — Compact package and serial interfaces enable MCU control of RF modules and peripheral management.

Unique Advantages

• Ultra-low standby and deep-sleep currents: Enables extended battery life in sleep-dominant designs (down to 36 nA in SHUT DOWN).
• Compact, production-ready package: 16‑TSSOP surface-mount package with 13 I/Os simplifies PCB integration for space-constrained products.
• Integrated mixed-signal peripherals: 12-bit ADC, comparators and temperature sensor reduce external BOM and simplify sensor interfacing.
• Flexible serial connectivity: I2C, SPI, USART/UART and LPUART allow straightforward integration with sensors, memory and communication modules.
• Embedded system robustness: POR/LVR/LVI protections, CRC unit, watchdog timer and clock monitoring help improve system reliability.
• Fast wakeup and deterministic control: 5 μs wakeup time and a Cortex-M0+ core running at 32 MHz for responsive control and real-time tasks.

Why Choose A31L221AR?

The A31L221AR balances efficient processing, integrated analog capabilities and industry-oriented operating ranges in a compact 16‑TSSOP package. It is well suited for designs where low power, reliable sensor interfacing and flexible serial communications are critical, such as IoT endpoints, detectors and battery-powered handheld devices.

With built-in protections, debug support and a set of peripherals that reduce external components, the A31L221AR provides a focused, production-ready platform for engineers seeking to minimize system complexity while maintaining robust performance and long-term operational stability.

Request a quote or submit an inquiry to our sales team to discuss pricing, availability and evaluation sample options for the A31L221AR.