 Hello, and welcome to this STM32 Ultra Low Power Benchmark with EEMBC. The STM32 portfolio offers an extraordinary variety of options, including ARM Cortex-M cores, giving developers flexibility to find the perfect match for their application. Particular attention is paid to make it easy to switch from one device to another. The STM32 is defined in three segments, high performance series, mainstream series, and of particular interest to us, ultra low power series. A good compromise between low consumption and performance is STM32 L476RG and L433RC. It will be a good candidate to benchmark. Now ULP modes, key points. The STM32 L4 offers best-in-class power consumption with full flexibility. The user can select the best operating mode, depending on the wake-up time, state of retention, and the number of sources required. It exists nine different modes able to push down your power consumption until two nanoamps. Now how to benchmark MCU objectively? To measure power energy, we need software embedded in STM32 provided by the EEMBC Foundation. The reference in Power Benchmark device able to measure power consumption. For this, there are two possibilities. First, energy monitor from EEMBC based on proprietary hardware. The second one, ST Power Bench, is based on the NI acquisition solution. And finally, a result is displayed as a normalized score. What is the EEMBC and how do they measure? The EEMBC is a non-profit consortium supported by member dues and license fees. The ULP Bench provides an accurate tool for measuring energy, applicable for any application where current consumption is less than or equal to 28 milliamps at three volts. The use case for measurement is normalized and realistic. ULP Bench and Coremark scores are references in the domain. The ULP Bench is in continuous improvement to be phased in with new IoT devices. The ULP Bench is the best way to optimize the IoT edge node for power and performance. The EEMBC framework is the best partner to develop IoTs. The ST power measurement device is based on STM32L476 N64 board for the device under test. A computer, a national instrument USB 6353 acquisition device, and of course a PC to compute and display data. The power measurement system is able to create the board supply from 1.8 volts to 3 volts, acquire signal with a speed of 1 mega-sample per second, measure current with differential channel to noise immunity, and synchronize the capture with digital IOs from DUT. Now let's play with the device and ST power measurement bench. For a 3-volt supply, the score is 147.4. If we push the experience even further, at 1.8 volts, the score is 283.1. Experts for STM32L011 are also good, 132.8 at 3 volts and 231.2 at 1.8 volts. And STM32L433 results are impressive with a score above most competitors. In summary, for a 3-volt core power supply, the ST Microelectronics power measurement bench obtains 147.4, 149.5 for design and electronic magazine, and 153.0 for EEMBC. Scores can be considered equivalent, but the interesting thing is, if we compare results with a core supplied at 1.8 volts, ST and design and electronic measurements are already closed, and the score increases considerably. STM32L011 is a high-standard competitor with good results, especially with a 1.8 volt power supply. STM32L433 is the outstanding competitor with results close to 179 at 3 volts. An impressive score with 334.4 points. This is probably the best market score at 1.8 volt core power supply. It is in this context that the STM32L433 is the best device. A combination of a very high ULT bench score and an impressive core mark result made him the best compromise of the market.