Silicon Labs introduced the industry’s most energy-friendly 32-bit microcontrollers (MCUs) based on the ARM® Cortex®-M0+ processor.
The EFM32™ Zero Gecko MCU family is designed to achieve the lowest system energy consumption for a wide range of battery-powered applications such as mobile health and fitness products, smart watches, activity trackers, smart meters, security systems and wireless sensor nodes, as well as battery-less systems powered by harvested energy. The new Zero Gecko family is the latest addition to the EFM32 Gecko portfolio pioneered by Energy Micro. The family includes 16 cost-effective MCU products designed from the ground up to enable the lowest possible energy consumption for connected devices enabling the Internet of Things (IoT). The EFM32 Zero Gecko MCUs feature the industry’s most sophisticated energy management system with five energy modes that enable applications to remain in an energy-optimal state, spending as little time as possible in the energy-hungry active mode. In deep-sleep mode, Zero Gecko MCUs have an industry-leading 0.9μA standby current consumption with a 32.768 kHz RTC, RAM/CPU state retention, brown-out detector and power-on-reset circuitry active. Active-mode power consumption scales down to 110µA/MHz at 24MHz with real-world code (prime number search algorithm) executed from flash. Current consumption is less than 20nA in shut-off mode. The EFM32 MCUs further reduce power consumption with a 2-microsecond wakeup time from standby mode.
Like all EFM32 Gecko products, the Zero Gecko MCUs include a best-in-class energy-saving feature called the Peripheral Reflex System (PRS) that significantly enhances system-level energy efficiency. The PRS monitors complex system-level events and allows different MCU peripherals to communicate directly with each other and autonomously without involving the CPU. Leveraging the PRS, an EFM32 MCU can watch for a series of specific events to occur before waking the CPU, thereby keeping the Cortex-M0+ processor core in an energy-saving standby mode as long as possible and reducing overall system power consumption.
The EFM32 Zero Gecko MCUs feature many of the same power-saving precision analog peripherals included in Silicon Labs’ popular Tiny Gecko, Giant Gecko and Wonder Gecko devices. These low-energy peripherals include an analog comparator, a supply voltage comparator, an on-chip temperature sensor and a 12-bit analog-to-digital converter (ADC) with 350μA current consumption at a 1MHz sample rate.
The EFM32 Zero Gecko devices are the only Cortex-M0+ MCUs on the market that integrate a programmable current digital-to-analog converter (IDAC). This on-chip precision-analog IDAC generates a biasing current from 0.05-64µA with only 10nA overhead. The IDAC provides an accurate bias and/or control capability for companion ICs and other external circuits including amplifiers, sensors, Wheatstone bridges and resistor ladders, thereby eliminating the need for external power amplifier components for many cost-sensitive applications.