MS51XB9AE Nuvoton Enhanced 1T 8051 Core 8-bit MCU 16KB Flash 24MHz QFN-20

MS51XB9AE Product Overview

The MS51XB9AE is an enhanced 8-bit 8051-core microcontroller from Nuvoton Technology, part of the NuMicro® MS51 series. Featuring a 1T operating mode with an instruction set fully compatible with standard 80C51 while delivering significantly enhanced performance, the MS51XB9AE is housed in a QFN-20 (3.0×3.0×0.8mm) ultra-compact package, reducing board footprint by approximately 70% compared to TSSOP-20. The MS51XB9AE operates at up to 24MHz across a wide 2.4V to 5.5V voltage range with an industrial temperature range of -40°C to +105°C, and offers 4kV EFT immunity. The MS51XB9AE integrates 16KB Flash (APROM), 1KB SRAM, and an additional 1KB on-chip auxiliary RAM (XRAM), with configurable 4K/3K/2K/1KB LDROM region. With rich peripherals including 18 GPIO, 8-channel 12-bit ADC (500KSPS), 6×16-bit PWM, 2 UART, 1 SPI, and 1 I2C, the MS51XB9AE provides a cost-effective embedded control solution for LED lighting, home appliances, industrial control, motor control, battery management, and wireless charging applications.

MS51XB9AE Typical Applications

LED lighting control and dimming drivers using the MS51XB9AE

Wireless chargers and battery management systems based on the MS51XB9AE

Portable IoT terminal devices powered by the MS51XB9AE

Home appliance control (small appliances, smart plugs) with the MS51XB9AE

Industrial automation and sensor nodes using the MS51XB9AE

Motor control (with PWM Fault Brake function) implemented by the MS51XB9AE

Switching power supplies and adapters designed with the MS51XB9AE

FAQ

Q: What advantage does the 1T architecture offer over traditional 8051?
A: Conventional 80C51 requires 12 clocks per machine cycle, while the MS51XB9AE's 1T architecture needs only one clock, delivering 12× faster instruction execution. At the same 24MHz frequency, actual computing performance far exceeds traditional 8051.

Q: Does it support ISP in-system upgrade?
A: Yes. The MS51XB9AE includes configurable 4KB LDROM (configurable to 4K/3K/2K/1KB) for ISP boot code. The MS51XB9AE supports ICP and ISP via UART for field firmware updates.

Q: Is it pin-compatible with the N76E003AQ20?
A: Yes. In the QFN-20 package, the MS51XB9AE is pin-compatible with the N76E003AQ20, enabling smooth migration from the N76E003 series. The programming tool must be updated to ICP V3.01.6951 or later.

Q: What are the clock system features?
A: The MS51XB9AE supports 3 clock sources: external clock input, 24MHz/16MHz high-speed internal oscillators (factory-calibrated, ±1% at VDD=5.0V), and 10kHz low-speed internal oscillator (±2% factory accuracy). All clock sources support on-the-fly software switching without reset for flexible power-performance balance.

Q: What are the PWM output features?
A: The MS51XB9AE includes a 16-bit PWM generator outputting 6× 16-bit PWM channels with ADC capture function and configurable dead-time, plus Fault Brake function - ideal for motor control and power management applications.

Q: Is an evaluation board available?
A: Yes. Nuvoton offers the NuTiny-MS51FB evaluation board featuring the MS51FB9AE as the main MCU, functionally downward compatible with the MS51XB9AE and MS51XB9BE, paired with the Nu-Link debugger and Keil/IAR development environments.

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