As Nuvoton’s agent, the editor will introduce to you Nuvoton’s new low-power 5V microcontroller NuMicro M251/M252 series, based on Arm Cortex-M23 embedded core, supporting Armv8-M instruction set architecture, and operating frequency: 48 MHz, built-in 32 KB to 256 KB Flash and 8 KB to 32 KB SRAM, its current consumption is as low as 2.0 μA in deep power-down mode, M251/M252 series built-in five power management modes and three chip safety protections Mechanism to meet the perception devices that pay attention to power consumption and high security in the Industrial Internet of Things.

NuMicro M251/M252 series provide high-performance and rich peripheral interfaces, such as programmable serial interface (PSIO), adjustable voltage interface (VAI) with up to 6 pins, external expansion interface (EBI), universal serial interface (USCI) ), QSPI, SPI/I²S, I²C, smart card interface (ISO-7816-3), watchdog timer, RTC and up to 24 channels PWM, providing flexibility in hardware design. In the high-performance analog peripheral, it provides a maximum 16-channel 12-bit 880 kSPS sampling rate; 1 set of operational amplifiers can be used for motor control for small signal amplification; 1 set of 12-bit 1 MSPS sampling rate DAC and 2 sets of analog comparators (ACMP ); Built-in five-level reference voltage Vref can provide accurate voltage for ADC and ACMP; rich analog peripherals can improve product performance, reduce the use of external peripheral components and reduce the size of end products. In addition to the features of the M251 series, the M252 series microcontrollers internally generate precise frequency clock signals required for USB communication, and support USB 2.0 full-speed device interfaces without external crystal oscillators, saving terminal product costs and reducing product size.

The NuMicro M251/M252 series operate in a wide operating voltage range of 1.8V to 5.5V and an industrial temperature range of -40°C to 105°C, and provide 20 to 128-pin packages and up to five power management modes. It also integrates independent RTC power supply VBAT pin. In power-down mode, the low-power UART supports the transmission speed of 9600 bps baud rate. Through these features, the power management becomes more efficient. The M251/M252 series consumes 138 μA/MHz in normal operation mode, 60 μA/MHz in standby mode, 2.5 μA in power-down mode (RTC on, RAM data retention), and deep power-down without VBAT The current in the mode is less than 1.4 μA.

NuMicro M251/M252 series provide Nuvoton's patented 8-channel programmable serial interface (PSIO), which can be used with PDMA to synchronously drive various custom serial interfaces, such as DMX512, HDQ, 1-wire, Microwire, and programmable Encoders, etc., no matter it is a general serial interface or a special serial interface, only by setting the serial timing and the input/output of each pin, the transceiver function can be easily realized and the CPU can be reduced. Burden, show the efficiency and flexibility of the custom serial interface through PSIO hardware, and shorten the developer's programming time.

For low-power devices in the Industrial Internet of Things, the M251/M252 series support 5V operating voltage and have 7 kV ESD and 4.4 kV EFT to improve the anti-interference ability of the product. Its five power modes help battery devices extend their service life. Three chip security protection mechanisms are used to protect developers' programs, and a wealth of peripherals have the ability to connect to multiple sensors.

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