RENERGY RN8213

RN821X is a low-power, high-performance, highly integrated, and highly reliable single-phase SOC chip. It is embedded with a 32-bit ARM Cortex-M0 core, which can meet the current and future growing functional and performance requirements of single-phase smart meters.

• High integration: integrates 32-bit ARM Cortex-M0, metering module, hardware temperature-compensated RTC, LCD controller, and EEPROM
• Wide voltage range: metering accuracy guaranteed over 2.8V~5.5V; typical CPU subsystem operating range 2.2V~5.5V; GPIO supports interfacing with devices at different operating voltages
• High performance: typical CPU operating frequency 3.6864MHz (up to 29.4912MHz)
• Low power consumption: typical current ~3.5mA in single-phase smart meter applications; ~16μA at 32KHz system clock; ~6μA chip-level sleep mode current; ~18uA display current (charge pump) or ~13uA (resistor divider)
• High accuracy: active energy error <0.1% over 5000:1 dynamic range; typical metering reference temperature coefficient 5ppm; RTC pulse-per-second error <±5ppm over -25℃~70℃; minimum correction resolution 0.068ppm
• Package: LQFP64 / LQFP100
• ARM Cortex-M0 core
• Maximum operating frequency up to 29.4812MHz; 3.6864MHz recommended for single-phase smart meter applications
• Up to 128Kbytes FLASH; 100,000 erase/write cycles; data retention >20 years
• Up to 8Kbytes SRAM (fully available to users)
• Up to 32Kbytes EEPROM; 1,000,000 erase/write cycles; WORD programming (not BYTE programming); data retention >20 years
• Single-cycle multiplier (32-bit × 32-bit)
• CM0 embedded SysTick timer
• Multiple wake-up sources including external interrupt; comprehensive integrated hardware/software development environment
• Active and reactive metering error <0.1% over 5000:1 dynamic range
• Typical reference voltage temperature coefficient: 5ppm/℃
• Simultaneous dual-channel (neutral + line) measurement of active power, reactive power, apparent power, and RMS current
• Simultaneous dual-channel (neutral + line) accumulation of active energy, reactive energy, and apparent energy
• RMS voltage and line frequency measurement
• Sampling channel gain and offset calibration
• Power factor output
• Full voltage-loss metering solution
• DC metering solution
• Voltage swell/sag event detection; current overload event detection; harmonic analysis solution
• Three metering sigma-delta ADC raw sample data outputs for secondary algorithm development on M0
• Hardware automatic temperature compensation — meets standard accuracy and power requirements without CPU involvement
• Temperature sensor: accurate temperature readings; ±1℃ measurement accuracy over -25℃~70℃
• Supports 4×34, 6×32, 8×30 (LQFP100) or 4×16, 6×14, 8×12 (LQFP64)
• Selectable charge pump or resistor divider for LCD voltage supply; clear display over wide voltage and full temperature range
• For more segment capacity, select 8COM 5V display (charge pump); for lower display power, select 6COM 3V display (resistor divider) — hardware-compatible, software configuration change only
• High-speed GPIO with multi-voltage peripheral interfacing support
• 10-bit ADC: temperature sensor / battery voltage detection / general-purpose ADC time-division multiplexing
• LVD: monitors chip supply voltage or external voltage; ~0.5uA power consumption
• Two comparators CMP1 and CMP2: external voltage detection; ~0.5uA power consumption; low-power supply monitoring during power failure
• Timers: two 32-bit extended timers, two RTC timers, one CM0 embedded SysTick timer
• UART: up to 6; auto baud rate, IR modulation, and UART wake-up support
• ISO 7816 interface: 2
• I2C: 1
• SPI: 1
• Watchdog: hardware watchdog
• Key interrupt: up to 8, pin-multiplexed
• External interrupt: up to 8, pin-multiplexed
• Low-cost, high-reliability solution (7816 interface)