1.Summary

RN831X is a low power, high performance, highly integrated, highly reliable chip, in which an 32-bit ARM  Cortex-M0 core is embedded, and this product is able to meet the growing requirements for functions and performance of three-phase smart meter.

2.Product Features

Fundamental Features

n Highly integrated: 32bit ARM Cortex-M0, Hardware temperature compensation (RTC), The controller of  LCD,EEPROM;

n Wide voltage range: 

 Typical voltage range of CPU system is 2.2V ~ 5.5V;

 GPIO supports docking devices having different operating voltages.

n High performance: Typical CPU operating frequency is 7.3728MHz (Maximum up to 29.4912MHz);

n Low power: Typical power consumption is about 2mA at normal operation;

 Power consumption is about 18uA when the system operates at 32KHz;

 Power consumption of the overall chip is about 10uA in sleep mode.

n High precision: 

 The second pulse error of RTC is less than ± 5ppm within -25 ℃ ~ 70 ℃ and the 

minimum calibration scale is 0.068ppm;

n Package Type: LQFP128

Processor-related

n ARM Cortex-M0 core;

n The maximum operating frequency is up to 29.4812Mhz, 7.3728MHz is recommended for the three-phase smart  meter applications;

n Maximum support 224Kbytes FLASH memory,100000 Programming Cycles, More than 20 years of data  retention;

n Maximum support 16Kbytes SRAM;

n Maximum support 32KbytesEEPROM,1000000 Programming Cycle, support for byte operation, more than 20  years of data retention;

n Single-cycle multiplier(32bit*32bit);

n System timer is embedded in the CM0;

n 2 DMA controllers;

n Support for external interrupts and other ways to wake up;

n Complete hardware and software for the integrated development environment is provided.

RTC

n Hardware’s automatic temperature compensation, precision and power consumption meet the national standard;

n Temperature Sensor: Provide accurate temperature, temperature measurement accuracy is ± 1 ℃ in the range  of -25 ℃ ~ 70 ℃;

n Power consumption less than 2uA;

LCD

n Support 4*36、6*34、8*32;

n Support DMA automatic loop display without CPU operating;

n Charge pump provides LCD voltage, supporting clearly display over wide voltage range and the full temperature  range;

n Power consumption of automatic loop display is less than 20uA.

Other Peripherals

n High speed GPIO, supports interface of peripheral devices with different voltage;

n 10bit ADC: Temperature sensor / battery voltage detection / generic ADC time division multiplexing;

n Voltage detecting LVD: chip supply voltage detection; external voltage detection.

n Two comparator CMP1and CMP2: external voltage detection, among which the CMP2’s power consumption is 

less than 1uA,supporting low power supply monitoring under power failure.

n Timer:2 32bit extended timer,2 RTC timer,1 CM0 embedded system timer;

n UART:6 at most, supports automatic baud rate, support infrared modulation, supports UART wake up;

n 7816 port:2

n I2C:1

n SPI:1

n Watchdog: Hardware watchdog;

n Button Interrupts: 8, pin multiplexing;

n External interrupts: 8, pin multiplexing;

Encryption

n Hardware true random number generator meets the U.S. NIST FIPS140-2 standard;

n AES128/192/256 hardware encryption meets the FIPS197 standards, supporting EBC / CBC / CTR / GCM /  GMAC mode;

n ECC192 hardware accelerators;

n Encryption documentation refers to Renergy application notes.

Card Meter Isolation

Provide high reliable and low cost card meter isolation solutions which can be seen in detail in Renergy RN8501 card  meter isolation scheme explains;