Item specifics
Description
MS51FB9AE Product Overview
The MS51FB9AE 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 MS51FB9AE is housed in a TSSOP-20 (4.4×6.5mm) package. The MS51FB9AE 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. The MS51FB9AE integrates 16KB Flash (APROM), 1KB SRAM, and an additional 1KB on-chip auxiliary RAM (XRAM). With rich peripherals including 18 GPIO, 8-channel 12-bit ADC (500KSPS), 6×16-bit PWM, 2 UART, 1 SPI, and 1 I2C, the MS51FB9AE provides a cost-effective embedded control solution for home automation, industrial control, IoT devices, battery management, and wireless charging applications.
| Model | MS51FB9AE |
| Series | NuMicro® MS51 |
| CPU Core | 1T 8051 (Standard 80C51 compatible) |
| Max Frequency | 24 MHz |
| Program Memory | 16KB Flash (APROM) |
| LDROM | Configurable 4K/3K/2K/1KB (for ISP boot code) |
| RAM | 1KB SRAM + 256 Bytes On-Chip RAM |
| Operating Voltage | 2.4V ~ 5.5V |
| Operating Temp | -40°C ~ +105°C |
| EFT Immunity | 4 kV |
| I/O Pins | 18 GPIO + 1 Input-only |
| ADC | 8 channels × 12-bit, up to 500 KSPS |
| PWM | 6× 16-bit PWM with Fault Brake |
| Connectivity | 2×UART, 1×SPI (up to 12Mbps), 1×I2C (up to 400kbps) |
| Timers | Timer 0/1/2/3, WDT, WWDT, WKT |
| Clock System | 24MHz/16MHz HS internal OSC, 10kHz LS internal OSC |
| Power Management | BOD (4-level), POR, LVR |
| Low-Power Modes | Idle Mode, Power-Down Mode |
| Security | 96-bit UID, 128-bit UCID, Flash Encryption |
| Programming | ICP, ISP, IAP |
| Package | TSSOP-20 (4.4 × 6.5 × 0.9 mm) |
MS51FB9AE Typical Applications
LED lighting control and dimming drivers using the MS51FB9AE
Home appliance control (washing machines, refrigerators, air conditioners, small appliances) powered by the MS51FB9AE
Industrial automation and sensor nodes built around the MS51FB9AE
Motor control (with PWM Fault Brake function) implemented by the MS51FB9AE
Battery management systems featuring the MS51FB9AE
Switching power supplies and wireless chargers designed with the MS51FB9AE
Smart home and IoT terminal devices based on the MS51FB9AE
MS51FB9AE Advantages & Highlights
Efficient 1T 8051 Architecture: The MS51FB9AE's 1T operating mode delivers up to 12× faster instruction execution compared to traditional 12T 8051 at the same frequency. 24MHz main frequency provides powerful real-time control capability for high-end motor control and other demanding applications.
Ideal N76E003AT20 Replacement: The MS51FB9AE is pin-compatible with N76E003AT20 in TSSOP-20 package for direct replacement, with improvements in performance, Flash read/write speed, and storage capacity, providing a convenient upgrade path.
Ultra-High Cost-Performance Ratio: The MS51FB9AE offers extremely competitive pricing with 16KB Flash, 8-channel 12-bit ADC, and 6-channel PWM, with reference pricing as low as ~$0.26/piece, ideal for cost-sensitive embedded projects.
High Integration Single-Chip Solution: The MS51FB9AE integrates ADC, PWM, UART, SPI, I2C, and multiple clock sources on a single chip, greatly simplifying peripheral circuit design and reducing BOM cost and PCB footprint.
Industrial-Grade Reliability: The MS51FB9AE operates from -40°C to +105°C wide temperature, with 4kV EFT immunity, 7-level BOD voltage monitoring for long-term stable operation in harsh industrial environments.
Complete Development Ecosystem: For the MS51FB9AE, Nuvoton provides NuTiny-MS51FB evaluation board, Nu-Link debugger, complete firmware libraries, and abundant application notes, with KEIL and IAR development environment support for accelerated product development.
FAQ
Q: What advantage does the 1T architecture offer over traditional 8051?
A: Conventional 80C51 requires 12 clocks per machine cycle, while the MS51FB9AE's 1T architecture needs only one clock, delivering 12× faster instruction execution. At the same 24MHz frequency, actual computing performance far exceeds traditional 8051, enabling more complex control algorithms.
Q: Does it support ISP over-the-air upgrade?
A: Yes. The MS51FB9AE includes 4KB LDROM (configurable to 4K/3K/2K/1KB) for ISP boot code. The MS51FB9AE supports ICP (In-Circuit Programming) and ISP (In-System Programming) via UART for field firmware updates.
Q: Is it pin-compatible with the N76E003AT20?
A: Yes. In the TSSOP-20 package, the MS51FB9AE is pin-compatible with the N76E003AT20, enabling smooth migration from the N76E003 series. Nuvoton provides a migration guide from N76E003 to MS51 series.
Q: What are the clock system features?
A: The MS51FB9AE 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 MS51FB9AE includes one 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. For the MS51FB9AE, Nuvoton offers the NuTiny-MS51FB evaluation board with the Nu-Link debugger and Keil/IAR development environment for rapid evaluation and embedded application development. Complete SDK, BSP, and example code are available on the Nuvoton website.
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