General Features

• High Integration: Integrated 32-bit ARM Cortex-M0, hardware temperature-compensated RTC, LCD controller and EEPROM.

• Wide Voltage Range: Typical operating voltage of CPU minimal system: 2.2V ~ 5.5V.

• GPIO supports interfacing with devices of different operating voltages.

• High Performance: Typical CPU frequency 7.3728 MHz, maximum up to 29.4912 MHz.

• Low Power Consumption: Typical power consumption about 2mA for three-phase smart meter applications;System power consumption about 18μA when running at 32kHz;Overall chip power consumption about 10μA in sleep mode.

• High Precision: RTC second pulse error less than ±5ppm at -25℃ ~ 70℃, minimum calibration resolution 0.068ppm.

• Package: LQFP128.

Processor

• ARM Cortex-M0 core.

• Max operating frequency up to 29.4812 MHz; 7.3728 MHz recommended for three-phase smart meter applications.

• Up to 224KB Flash memory, 100,000 erase/write cycles, data retention over 20 years.

• Up to 16KB SRAM.

• Up to 16KB EEPROM, 1,000,000 erase/write cycles, byte-level operation supported, data retention over 20 years.

• Single-cycle 32bit × 32bit multiplier.

• Cortex-M0 built-in system timer.

• 2 DMA controllers.

• Supports multiple wake-up methods such as external interrupt.

• Complete integrated software and hardware development environment provided.

RTC

• Automatic hardware temperature compensation, meeting national standard accuracy and power consumption requirements.

• Built-in temperature sensor; measurement accuracy ±1℃ within -25℃ ~ 70℃.

• Power consumption lower than 2μA.

LCD Controller

• Supports 4×36, 6×34, 8×32 display formats.

• DMA automatic display rotation without CPU intervention.

• Built-in charge pump generates LCD driving voltage for clear display over wide voltage and full temperature range.

• Automatic display rotation power consumption lower than 20μA.

Other Peripherals

• High-speed GPIO, compatible with peripheral devices of different voltage levels.

• 10-bit SAR ADC: time-division multiplexed for temperature sensor, battery voltage detection and general analog input.

• LVD voltage detection: monitors internal chip power supply voltage and external voltage.

• Two comparators CMP1 and CMP2 for external voltage detection; CMP2 consumes less than 1μA and supports low-power power monitoring during power failure.

• Timers: 2 × 32-bit extended timers, 2 RTC timers, 1 Cortex-M0 built-in system timer.

• UART: up to 6 channels, supporting automatic baud rate, infrared modulation and UART wake-up.

• ISO 7816 port: 2 channels.

• I2C: 1 channel.

• SPI: 1 channel.

• Hardware watchdog.

• Up to 8 multiplexed key interrupt pins.

• Up to 8 multiplexed external interrupt pins.

Security Encryption

• Hardware true random number generator, compliant with NIST FIPS 140-2 standard.

• AES128/192/256 hardware encryption compliant with FIPS 197; supports ECB, CBC, CTR, GCM and GMAC modes.

• ECC192 hardware accelerator.

• Refer to Renergy application notes for encryption technical documents.