Item specifics
Description
N76E003AT20 Product Overview
The N76E003AT20 is a high-speed 1T 8051-core microcontroller from Nuvoton Technology, part of the NuMicro® N76E003 series. Featuring an instruction set fully compatible with standard 80C51 while delivering significantly enhanced performance, the N76E003AT20 is housed in a TSSOP-20 (4.4×6.5mm) package. The N76E003AT20 operates at up to 16MHz across a wide 2.4V to 5.5V voltage range with an industrial temperature range of -40°C to +105°C, and offers high noise immunity of 7kV ESD / 4kV EFT. The N76E003AT20 integrates 18KB Flash (APROM), 1KB SRAM, and configurable Data Flash. With rich peripherals including 18 GPIO, 8-channel 12-bit ADC (500KSPS), 6-channel 16-bit PWM, 2 UART, 1 SPI, and 1 I2C, the N76E003AT20 provides a cost-effective embedded control solution for access control systems, thermostats, Bluetooth speakers, electric meters, data collectors, battery chargers, beauty equipment, and small home appliances.
| Model | N76E003AT20 |
| Series | NuMicro® N76E003 |
| CPU Core | 1T 8051 (Standard 80C51 compatible) |
| Max Frequency | 16 MHz |
| Program Memory | 18KB Flash (APROM, shared with Data Flash) |
| LDROM | Configurable 4K/3K/2K/1K/0K Bytes |
| RAM | 1KB SRAM + 768 Bytes XRAM |
| Operating Voltage | 2.4V ~ 5.5V |
| Operating Temp | -40°C ~ +105°C |
| ESD Immunity | 7 kV (HBM) |
| EFT Immunity | 4 kV |
| I/O Pins | Up to 18 GPIO + 1 Input-only |
| ADC | 8 channels × 12-bit, up to 500 KSPS |
| PWM | 6× 16-bit with Dead-Zone & Fault Brake |
| Connectivity | 2×UART (115200bps), 1×SPI (8MHz), 1×I2C (400kHz) |
| Timers | 4×16-bit (Timer0/1/2/3), WDT, WKT |
| Clock System | 16MHz HS internal OSC (±2%), 10kHz LS internal OSC |
| Power Management | BOD (4-level), POR |
| Low-Power Modes | Idle Mode, Power-Down Mode |
| Programming | ICP, ISP, IAP |
| Package | TSSOP-20 (4.4 × 6.5 × 0.65 mm) |
| Development Tools | Keil C51, IAR EW8051, Nu-Link Debugger |
| Product Status | Active |
N76E003AT20 Typical Applications
Battery chargers and wireless chargers using the N76E003AT20
LED lighting control and dimming drivers based on the N76E003AT20
Small home appliance control (rice cookers, induction cookers, soy milk makers) using the N76E003AT20
Temperature sensing devices and thermostats
Smoke detectors and gas detectors
Access control systems/alarms
Digital voltmeters and data loggers
Bluetooth speakers and beauty devices
FAQ
Q: What advantage does the 1T architecture offer over traditional 8051?
A: Conventional 80C51 requires 12 clocks per machine cycle, while the N76E003AT20's 1T architecture needs only one clock, delivering 12× faster instruction execution. At the same 16MHz frequency, the N76E003AT20's actual computing performance far exceeds traditional 8051.
Q: Does it support ISP in-system upgrade?
A: Yes. The N76E003AT20 includes configurable LDROM (up to 4KB) for ISP boot code. The N76E003AT20 supports ICP and ISP via UART for field firmware updates.
Q: Can MS51FB9AE directly replace N76E003AT20?
A: Yes. The MS51FB9AE is fully pin-compatible with the N76E003AT20 in TSSOP-20, allowing direct replacement of the N76E003AT20 without schematic changes.
Q: What are the clock system features?
A: The N76E003AT20 supports 3 clock sources: external clock input, 16MHz high-speed internal oscillator (factory-calibrated, ±2% over all conditions, ±1% at VDD=5.0V), and 10kHz low-speed internal oscillator. The N76E003AT20 supports on-the-fly software switching without reset for flexible power-performance balance.
Q: What are the PWM output features?
A: The N76E003AT20 includes a 16-bit PWM generator outputting 6× 16-bit PWM channels with configurable dead-time and Fault Brake function - ideal for motor control and power management applications.
Q: Is an evaluation board available?
A: Yes. For the N76E003AT20, Nuvoton offers the NT-N76E003 evaluation board with 100% emulation and on-board debugging, paired with the Nu-Link debugger and Keil/IAR development environments. The open-source community also provides tools like nuvoprog for programming support.
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