Among many Internet of things devices that rely on battery power, such as smart meters, personal wearable devices, home medical care, smart home, remote measurement and control, wireless sensors, etc., device endurance is a thorny problem, which poses a great challenge to the core device in the device – microcontroller (MCU), and low-power MCU came into being. According to the prediction of relevant information, low-power MCU accounts for about 15% ~ 20% of the whole MCU market. Because of the considerable application prospect of low-power MCU, many manufacturers at home and abroad have introduced various types of low-power MCU to the market.

So how to choose a suitable low-power MCU chip?

We know that in low-power design, the average current consumption often determines the battery life, while the power-off mode (low-power mode) and operating current of different levels of functions determine the actual power consumption in application scenarios. In actual use, the ability to quickly enter or exit low-power mode (wake-up time), quickly process data (high-speed performance) and low operating power (low dynamic power consumption) is also very important. In addition, a good low-power MCU should provide interrupt function for all its peripherals, and well-designed integrated intelligent low-power peripherals can also reduce the number of MCU wakeups, thus further reducing the overall energy consumption of MCU. These are the key factors that need to be comprehensively considered in the selection of low-power MCU.

Among many low-power MCU products in the market, national technology n32l4xx series is the first low-power MCU designed by 40nm advanced process in the industry. It has been put into mass production and widely recognized by the market. It has become a “hot model” with its leading low-power technology and product maturity. Let’s explore the competition.

N32l4xx low-power MCU adopts a number of “hard core” designs to create industry-leading low-power features.

N32l4xx adopts multi power domain architecture technology to reduce standby power consumption of the chip. At the same time, it has a variety of power management modes. The static power consumption is as low as 1.5ua (typical value), and it can quickly wake up from the low power mode. The time from wake-up in stop2 state to the execution of the first instruction is only 20 minutes μ s。 With dynamic power regulation technology, the dynamic power consumption is as low as 60 μ A/mhz, with higher performance under the same low power consumption state, reaches the ultra-high performance and low power consumption of 37.2 coremark/ma, which is the leading level in the industry.

N32l4xx low-power MCU integrated peripherals also adopt low-power design technology to comprehensively reduce the overall energy consumption.

A low-power asynchronous serial communication interface (lpuart) is integrated to support receiving data wake-up in stop2 mode. It has a variety of data receiving and wake-up modes, which is more flexible to use. It further reduces power consumption by reducing MCU wake-up times.

A low-power rotary counter module (lprcnt) is integrated, which can be used for non-contact fluid flow metering (such as water meter flow metering). Automatically switch the sampling rate according to the current sensor position status to achieve the purpose of very low power consumption. It can work in stop2 mode. The flow metering does not need MCU intervention. MCU will wake up when the metering reaches the set flow threshold.

The integrated Segment LCD and other peripherals also adopt low-power design, which supports the display in stop2 mode and reduces the current consumption of LCD.

In addition to the excellent performance in low power consumption, the performance improvement is also excellent. The n32l4xx is equipped with an arm cortex-m4f core with a dominant frequency of up to 108MHz. It supports hardware multiplier and divider, floating-point operation function and DSP instructions. The CPU performance is up to 135dmips. It uses an efficient cache mechanism to ensure that the CPU accesses the flash zero wait execution program, giving full play to the CPU performance. The coremark score is up to 357.4 points. Based on the internal multi bus architecture and DMA controller, the data interaction is more efficient.

N32l4xx also has many comprehensive advantages, such as large storage capacity, high-performance analog peripherals (such as the industry-leading 5mbps high-speed 12bit ADC), rich digital interfaces, excellent hardware password acceleration engine and so on. Therefore, after its launch, it has won the favor of the market and industry users, and has become the strength of the microcontroller for ultra long endurance equipment!

At present, the national technology n32l4xx low-power MCU currently has two series and 17 mass production models to choose from.

▲ national technology n32l4xx low power MCU

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