NEW YORK — STMicroelectronics has added an ultra-low-power branch to its STM32 line of 32-bit ARM-based microcontroller units in what it calls a "constant quest" for lower power. The company said Tuesday that it is targeting its STM32L0 MCU at electronic designs that need to run on low power over a larger temperature range with smaller batteries and fewer battery changes.
Even a lonely outpost on the Internet of Things that harvests its own power, such as a remote industrial sensor, is a target. ST is aiming its new series at consumer, health, and medical markets. For example, it said an STM32L0-based fitness tracker could run for two years before its nonrechargeable coin-cell battery would need replacing.
The STM32L0's power savings is found in the MCU's processor core and peripherals, such as its analog-to-digital converter (ADC), which ST says consumes 40 µA at a conversion speed of 100 Ks/s and 200 µA at 1.14 Ms/s. The device also uses ST's own CMOS technology, which ST says is responsible for keeping the chip's power consumption low even at higher temperatures.
The STM32L0 MCU includes a 32MHz ARM Cortex MO+ processor core, a 12-bit ADC, and a USB FS 2.0 crystal-less solution.
This product series offers up to 64 KB of flash memory, up to 8 KB of SRAM, and 2 KB of embedded true EEPROM. An integrated hardware oversampling feature allows for 16-bit ADC resolution. STM 3210 devices with USB FS 2.0 interface support battery charger defection and link power management. A built-in 48 MHz oscillator allows crystal-less operation of the USB. The STM320 comes in three product lines -- access, USB, and USB/LCD. These devices feature highly competitive power consumption of a number of types from the 139 µA/MHz @ 32 MHz, 87 µA/MHz using an optimized mode, to the 400 nA in stop mode and full RAM retention and a wakeup time of 3.5.
The new devices are sampling from 85 cents each in 1,000-unit quantities; volume production is set to start in the second quarter. The new devices are compatible with the STM32L1 or any other STM32 devices, which ST says will enable its customers to upgrade quickly to the new devices.
— Zewde Yeraswork, Associate Editor, EE Times