Basic characteristics

◆High integration: integrated 32-bit ARM Cortex-M0, metering module, hardware temperature compensated RTC, LCD controller EEPROM;

◆Wide voltage: The voltage range that ensures measurement accuracy is 2.8V~5.5V;

◆The typical voltage range that the CPU small system can run is 2.2V~5.5V;

◆GPIO supports docking with devices operating at different voltages.

◆High performance: The typical operating frequency of the CPU is 3.6864MHz (up to 29.4912MHz);

◆Low power consumption: The typical power consumption for single-phase smart meter applications is about 3.5mA;

◆The system operates at 32Khz with a power consumption of approximately 18 μ A;

◆The overall power consumption of the chip in sleep mode is about 10 μ A.

◆High precision: The active power error is less than 0.1% within a dynamic range of 5000:1; The typical value of the reference temperature coefficient for measurement is 5ppm;

◆RTC has a pulse error of less than ± 5ppm per second within -25 ℃~70 ℃, with a minimum calibration scale of 0.068ppm;

◆Packaging form: LQFP100

Processor related

◆ARM Cortex-M0 core;

◆The maximum operating frequency can reach 29.4812MHz, and it is recommended to use 3.6864MHz for single-phase smart meter applications;

◆Maximum support for 192Kbytes FLASH memory, with 100000 erasures and data retention time greater than 20 years;

◆Supports up to 16Kbytes SRAM;

◆ Supports up to 32Kbytes EEPROM, with 1 million erasures, byte operations, and data retention time greater than 20 years;

◆Single cycle multiplier (32bit * 32bit)

◆CM0 embedded system timer;

◆2 DMA controllers;

◆Support multiple wake-up methods such as external interrupts;

◆Provide a comprehensive integrated development software and hardware environment.

metering

◆The active power measurement error is less than 0.1% within the dynamic range of 5000:1;

◆The typical value of the reference voltage temperature coefficient is 5ppm;

◆Support simultaneous measurement of active power, reactive power, apparent power, and effective current values for both neutral and live channels;

◆Support simultaneous measurement of active energy, reactive energy, and apparent energy in both neutral and live channels;

◆Provide voltage effective value and voltage line frequency measurement;

◆Provide sampling channel gain and offset correction functions;

◆Provide power factor;

RTC

◆Hardware automatic temperature compensation, meeting the accuracy and power consumption requirements of national standards;

◆Temperature sensor: provides accurate temperature values, with a temperature measurement accuracy of ± 1 ℃ within the range of -25 ℃ to 70 ℃;

◆Power consumption is better than 2 μ A;

LCD

◆Support 4 * 34, 6 * 32, 8 * 30;

◆Support DMA automatic rotation display, no need to start CPU;

◆Charge pump provides LCD voltage and supports clear display across a wide voltage and full temperature range;

◆The power consumption of automatic wheel display is better than 20 μ A.

Other peripherals

◆High speed GPIO, supporting interfaces with peripheral devices of different voltages;

◆10 bit ADC: temperature sensor/battery voltage detection/universal ADC time-division multiplexing;

◆Voltage detection LVD: detects the power supply voltage of the chip; Detect external voltage.

◆Two comparators CMP1 and CMP2: detect external voltage, where CMP2 has a power consumption of less than 1 μ A and supports low-power power monitoring during power outages.

◆Timer: 2 32-bit extended timers, 2 RTC timers, 1 CM0 embedded system timer;

◆UART: up to 5, supports automatic baud rate, supports infrared modulation, supports UART wake-up;

◆7816 mouths: 2 pieces

◆I2C: 1 piece

◆SPI: 1 unit

◆Watchdog: Hardware watchdog;

◆Button interruption: 2, pin reuse;

◆External interrupts: 4, pin reuse;

encryption

◆Hardware true random number generator, compliant with the FIPS 140-2 standard of NIST in the United States;

◆AES128/192/256 hardware encryption, compliant with FIPS197 standard, supports EBC/BCC/CTR/GCM/GMAC modes;

◆ECC192 hardware accelerator;

◆Please refer to the RuiNeng Micro Application Notes for encryption instructions.

◆Card table isolation

◆Provide a low-cost and highly reliable solution for card table isolation. Please refer to the RuiNeng Micro RN8501 Card Isolation Solution Description for details;

◆RN821x model classification

RN821X is a low-power, high-performance, highly integrated, and highly reliable single-phase SOC chip. The product 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.