UM2082F08 — Ultra-Low-Power 8-bit MCU with 3-Channel LF Wake-up

The UM2082F08 is an ultra-low-power SoC based on a single-cycle 8051 core with three-channel low-frequency (LF) wireless wake-up ASK receiver. It detects 30–300 kHz LF carrier data and triggers wake-up, with adjustable sensitivity for reliable operation in various environments. Each of the three independent channels (X/Y/Z) supports RSSI detection, configurable wake-up modes, 1–8 kbps data rates, and Manchester encoding.

The chip integrates 32 KB Flash, up to 2 KB + 256 B SRAM, 12-bit 1 Msps SAR ADC, UART, SPI, I²C, PWM, and other peripherals. It features high integration, strong anti-interference, high reliability, ultra-low power, and minimal external components. Built-in high-speed ROSC, LDO, and POR eliminate the need for external crystal, LDO, or reset circuitry. LF wake-up uses an independent internal 32 kHz RC oscillator requiring no calibration. Supports Keil MDK with C and assembly development.

Key Features

LF Wireless Wake-up (independent of MCU)

• Three independent antenna channels: X/Y/Z

• Carrier frequency: 30–300 kHz

• Wake-up distance: >10 m

• Sensitivity: <70 μVrms

• Data rate: 1–8 kbps

Processor

• 8-bit high-performance 8051, single-cycle instruction set

• Max system clock 24 MHz, 0-wait-state fetch @ 0–16 MHz

Memory

• RAM: 256 B Idata + 2 KB Xdata

• 32 KB eFlash

Timers/Counters

• 2× 16-bit general timers T0/T1 (can be used as LPTimer)

• 1× 16-bit low-power timer with PWM output

• 1× Watchdog

Clocks

• Internal high-speed RCH: 24 MHz

• Internal low-speed RCL: 32 kHz

• Dedicated 32 kHz RC for LF wake-up

Peripherals

• 2× 16-bit PWM (including 1 from LPTimer)

• 2× enhanced UART

• 6-channel 12-bit SAR ADC, 1 Msps

• I²C master/slave, up to 400 kbps

• SPI master/slave, up to 12 Mbps

• Up to 11 GPIOs with configurable pull-up/down

Security & Protection

• Hardware anti-cloning design

• LVD, LVR, 16-byte unique chip UID

Electrical

• Operating voltage: 2.0–3.6 V

• Temperature: –40°C to +85°C

• ESD: 3 kV (HBM)

Development Support

• Built-in UART bootloader, ISP/IAP support

• Full SDK, EVB kit, offline programmer & mass-production tools

Package

• QFN20

Applications

• PKE (Passive Keyless Entry) systems

• Smart transportation, smart cities, smart home

• Smart locks, asset tracking, wireless monitoring sensors

• Industrial IoT terminals

• Toy controllers and general-purpose control applications