M031BTYE3AN - 48MHz Cortex-M0 MCU 128KB Flash QFN-48 | Nuvoton
MPN: M031BTYE3AN ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
M031BTYE3AN Overview
A microcontroller (MCU) is a single integrated circuit that combines a processor core, program memory, data memory, and peripheral functions into one chip, forming the computational heart of embedded systems. Within the power management hierarchy of embedded design, MCUs such as this sit at the system level: a Cortex-M0 core executes application firmware, while integrated peripherals (timers, UART, SPI, I2C, ADC, PWM) interface directly with sensors, actuators, and communication modules. The M031BT series additionally supports Bluetooth-connectivity system designs where a low-power host MCU coordinates a wireless module.
Key features of the M031BTYE3AN include the Arm Cortex-M0 processor core running up to 48 MHz, delivering efficient 32-bit processing with deterministic interrupt response for real-time control. The 128 KB flash memory accommodates substantial application code and OTA-style update schemes, while 16 KB SRAM provides working data storage. A dedicated 512-byte SPROM (Security Protection ROM) safeguards sensitive code or keys, and ISP/ICP/IAP programming modes allow in-system, in-circuit, and in-application flash updates without removing the device from the board.
The clocking architecture supports a 4 to 32 MHz HXT (high-speed external crystal) oscillator or external clock sources, with internal oscillators available as fallbacks, giving designers flexibility in cost-versus-accuracy trade-offs. The operating voltage range of 1.8V to 3.6V suits battery-powered and low-voltage interface applications. According to Nuvoton, the NuMicro M031/M032 series targets mobile devices, peripheral controllers, IoT sensor nodes, motor control, industrial control, and consumer applications.
Typical applications include IoT sensor devices where the 48 MHz Cortex-M0 core manages acquisition and preprocessing while a Bluetooth module handles wireless links; industrial control nodes requiring flash-based field updates via ISP/IAP; and consumer appliance control boards leveraging the compact 5x5 mm QFN-48 footprint.
A key design consideration: keep the supply within the specified 1.8V to 3.6V window and use decoupling capacitors close to each supply pin; flash programming via IAP requires careful sector planning to avoid erasing running code.
This page synthesizes distributor availability data, drop-in same-family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for M031BTYE3AN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
M032BTYE3AN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
M032BTTYE3AN
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
M031BTYE3AN Maximum Ratings & Electrical Characteristics
| Core Processor | Arm Cortex-M0 |
| Core Size | 32-bit |
| Maximum Clock Frequency | 48 MHz |
| Flash Memory | 128 KB (128K x 8) |
| SRAM | 16 KB |
| SPROM (Security Protection ROM) | 512 bytes |
| Operating Voltage Range | 1.8 V to 3.6 V |
| External Crystal Oscillator | 4 to 32 MHz HXT |
| Programming Modes | ISP / ICP / IAP |
| Package | 48-QFN (5x5 mm) |
| Mounting Type | Surface Mount |
| Series | NuMicro M031BT |
| Connectivity Focus | Bluetooth-connectivity system designs |
M031BTYE3AN 48-qfn (5x5 mm) Pin Configuration Guide
Pin configuration for M031BTYE3AN (48-qfn (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 M031BTYE3AN.
Refer to the datasheet for full pin configuration.
Typical Applications
M031BTYE3AN is suitable for 6 applications: Bluetooth IoT Sensor Nodes, Industrial Control Nodes, Motor Control Systems, Mobile and Peripheral Device Controllers, Consumer Appliance Control Boards, Embedded Development and Prototyping.
Bluetooth IoT Sensor Nodes
The M031BTYE3AN fits Bluetooth-connectivity IoT designs because its 48 MHz Cortex-M0 core handles sensor acquisition, filtering, and protocol framing while an external Bluetooth module manages the radio link. With 128 KB flash and 16 KB SRAM, it buffers sensor data and runs the host-side BLE transport layer without a larger, more power-hungry MCU. Its 1.8V to 3.6V operating range matches coin-cell or Li-ion supply rails common in wireless sensor devices, and the 512-byte SPROM can hold device keys for authenticated connections. Placed as the host controller with a UART or SPI link to the Bluetooth module, the MCU can enter low-power wait states between events; the main trade-off versus integrating the radio is board area, but the two-chip approach simplifies RF certification and firmware maintenance.
Recommended
Industrial Control Nodes
In industrial control, the M031BTYE3AN provides deterministic real-time response from its Arm Cortex-M0 core at 48 MHz, adequate for relay sequencing, sensor polling loops, and simple PID control. Nuvoton explicitly targets industrial control for the NuMicro M031/M032 series per the Keil device database. The 128 KB flash supports control firmware plus logging, and ISP/IAP programming enables field firmware updates without removing hardware from the panel, reducing maintenance cost. Operating at 1.8V to 3.6V, it interfaces cleanly with 3.3V industrial I/O and level-shifted 5V legacy circuits. Designers should provide robust ESD and surge protection on field-wired GPIO and use the HXT crystal for timing accuracy in communication-heavy nodes; the QFN-48 5x5 mm footprint keeps controller PCBs compact for DIN-rail mounted modules.
Recommended
Motor Control Systems
The M031BTYE3AN suits small motor control tasks such as DC fan, brushed-DC, and stepper control, where the 48 MHz Cortex-M0 core generates PWM at carrier frequencies well above the audible band and closes simple current or speed loops. According to Nuvoton, motor control is a designated application for the NuMicro M031/M032 series. The 128 KB flash accommodates commutation tables and protective routines, while IAP updates allow tuning changes in the field. Peripheral PWM outputs and fast GPIO provide gate-drive interfaces to external driver ICs; pairing the MCU with a dedicated gate driver such as the UCC27322DGN isolates the logic domain from power switching. The key design consideration is supply noise: keep the 3.3V MCU rail filtered from the motor power stage and route PWM traces away from the HXT crystal to preserve clock integrity.
Recommended
Mobile and Peripheral Device Controllers
Nuvoton positions the NuMicro M031/M032 series for mobile devices and application-processor-connected peripheral controllers. The M031BTYE3AN fits this role as a dedicated management controller: its 1.8V to 3.6V supply matches mobile battery rails, the 48 MHz core handles keyboard scanning, LED control, and battery-monitor polling, and 128 KB flash holds substantial peripheral firmware. The 5x5 mm QFN-48 package conserves board area in dense handheld layouts. When connected to an application processor over UART, SPI, or I2C, the MCU offloads always-on tasks so the main processor can sleep, extending battery life. Design considerations include matching the MCU I/O voltage to the host interface to avoid level shifters, and using the internal oscillators for cost-sensitive designs where crystal-level timing accuracy is not required.
Recommended
Consumer Appliance Control Boards
Consumer appliances - small kitchen devices, fans, heaters, and remote-control toys - benefit from the M031BTYE3AN's combination of low cost, compact 48-QFN packaging, and flash field-update capability. The 48 MHz Cortex-M0 executes user-interface logic, button debouncing, display driving, and simple control loops with headroom, while 16 KB SRAM supports state machines and small buffers. The 512-byte SPROM can store factory calibration data or serial numbers that survive firmware re-flashing during production rework. Because appliance boards demand reliability at minimum BOM cost, the ability to run from internal oscillators without an external crystal reduces component count. Designers should implement proper mains-isolation creepage on relay-driving GPIO and use the ICP programming mode for fast in-line programming at end-of-line test stations.
Recommended
Embedded Development and Prototyping
The M031BTYE3AN is the core device of Nuvoton's NuMaker-M031BT development platform, where the M031BTYE target board provides Arduino UNO-compatible headers, extension connectors, and a Nuvoton-designed ammeter connector for instant power-consumption measurement - essential for battery-life prototyping. This makes the part attractive for evaluating Cortex-M0 designs, teaching embedded courses, or validating firmware before committing to custom PCBs. ICP programming via the debug interface supports rapid edit-flash-test cycles, and ISP allows bootloader-based updates during development. Engineers transitioning from the NuMaker board to production should replicate the board's decoupling network and crystal layout, and verify the 1.8V to 3.6V supply sequencing with other board rails. The 48 MHz performance envelope is sufficient for most RTOS-free and lightweight-RTOS bare-metal designs.
Recommended
Recommended Products Summary
Engineering reference data for M031BTYE3AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | M032BTYE3AN | M032BTTYE3AN |
|---|---|---|---|
| Package | 48-QFN (5x5 mm) | 48-QFN (5x5 mm) - same family footprint | 48-QFN (5x5 mm) - same family footprint |
| Brand | Nuvoton Technology | Nuvoton Technology | Nuvoton Technology |
| Core | Arm Cortex-M0 | Arm Cortex-M0 | Arm Cortex-M0 |
| Maximum Clock Frequency | 48 MHz | 72 MHz | 72 MHz |
| Operating Voltage | 1.8 V to 3.6 V | 1.8 V to 3.6 V | 1.8 V to 3.6 V |
Key Differentiators
- Largest flash in the M031BT class at 128 KB (vs M032BTTYE3AN)
- Cost-optimized 48 MHz clock vs faster family members (vs M032BTYE3AN)
- Integrated 512-byte SPROM security ROM (vs Generic Cortex-M0 competitors (e.g., STM32F0 class))
Design Notes
Supply the M031BTYE3AN within its specified 1.8V to 3.6V window - operation above the absolute maximum will damage the device. Use a 3.3V rail with a local 10 uF bulk capacitor plus 0.1 uF ceramic decoupling on each supply pin of the QFN-48, placed within 2 mm of the pins. If the board mixes 5V peripherals, level-shift the interface; the MCU I/O is not 5V tolerant unless the datasheet explicitly states so. When powered from batteries, exploit wait/sleep modes and verify the quiescent contribution of the crystal oscillator against internal-oscillator operation.
The 48-QFN 5x5 mm package requires a well-defined exposed-pad solder land for grounding and heat spreading; follow the Nuvoton M031BT/M032BT datasheet Rev 2.02 footprint recommendations. Route the 4 to 32 MHz HXT crystal with short, symmetric traces, a ground guard ring, and no switching signals underneath. Keep ISP/ICP programming headers (SWD/ICE pins) accessible on the PCB even in production, since ICP is the standard end-of-line programming path. Violating crystal layout rules is a common cause of intermittent startup failures at cold temperatures.
When using IAP (In-Application Programming), plan flash sector allocation carefully: erasing a sector containing currently executing code will fault the Cortex-M0 core. Locate the bootloader and application in separate regions and only erase/update the application region. Additionally, do not overwrite the 512-byte SPROM with general code - it is the security protection region. For production units, enable flash lock/read-protection only after final firmware validation, as enabling protection complicates reprogramming during rework.
Compliance Information
Compliance status was not stated in the verified web data; consult the Nuvoton product page or datasheet Rev 2.02 for official RoHS/REACH declarations.
