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This article is providing benchmark of a set of well-known or reference pre-trained neural network models. Some STM32 results will be officially submitted to the MLPerf™ Tiny benchmark from MLCommons™.

Information

STM32Cube.AI is a software aiming at the generation of optimized C code for STM32 and neural network inference. It is delivered under the Mix Ultimate Liberty+OSS+3rd-party V1 software license agreement (SLA0048).
Inference time, current and energy measures process is described, not done in a certified laboratory but can be reproduce by any user. The results are average values and will vary depending on the input data (random data are currently used), temperature and the STM32 device itself.
Published data on this article are not contractual.
Copyright STMicroelectronics - All right reserved. Do not publish following data without written consent from STMicroelectronics

1. Benchmark Results

1.1. STM32 High Performance

STM32 Board	STM32 characteristics	Model Source/Link	Flash (KiB)	RAM (KiB)	Proc Time (ms)	Cur. (mA)	Energy (mJ) 3.3V	Version
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	49 ms	203 mA	33 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	51 ms	197 mA	33 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	93 ms	200 mA	62 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	1.2 ms	176 mA	0.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	11.5 ms	190 mA	7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	37 ms	190 mA	23 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	31 ms	198 mA	20 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	49 ms	97 mA	16 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	51 ms	95 mA	16 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	93 ms	96 mA	30 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	1.2 ms	86 mA	0.34 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	11.5 ms	97.5 mA	3.74 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	37 ms	91 mA	11 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H735 SMPS STM32H735G-DK	Flash 1MB RAM 564KB (432) Freq 550MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	31 ms	94 mA	9.6 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	49 ms	203 mA	33 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	59 ms	192 mA	37 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	108 ms	194 mA	69 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	1.4 ms	168 mA	0.78 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	13 ms	196 mA	8.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	42 ms	183 mA	25.6 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H743 NUCLEO-H743ZI	Flash 2MB RAM 1MB (512) Freq 480MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	36 ms	189 mA	22 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	68 ms	68 mA	15 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	70.5 ms	69.5 mA	16 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	130 ms	69.5 mA	30 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	1.6 ms	64 mA	0.34 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	16 ms	70 mA	3.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	51 ms	66 mA	11 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H747 SMPS STM32H747I-DISCO	Cortex® M7 Flash 2MB RAM 1MB (0.5) Freq 400MHz⁽¹⁾	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	43 ms	68.5 mA	9.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	96 ms	44 mA	14 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	100 ms	43.5 mA	14 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	184 ms	44 mA	26 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	2.3 ms	40 mA	0.3 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	23 ms	44.5 mA	3.3 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	72 ms	42 mA	10 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	61 ms	43 mA	9 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	97.5 ms	40.6 mA	13 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	101 ms	40.2 mA	13 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	185 ms	40.4 mA	25 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	2.3 ms	36 mA	0.28 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	22.9 ms	40.1 mA	3 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	72.5 ms	38.4 mA	9.2 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz AXI 140MHz⁽²⁾	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	61.4 ms	39.6 mA	8 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	124 ms	28.4 mA	11.6 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	128 ms	28 mA	11.8 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	235 ms	28.1 mA	21.8 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	2.9 ms	25.5 mA	0.24 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	29.1 ms	28.7 mA	2.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	92.3 ms	26.8 mA	8.2 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 220MHz (280) AXI 110MHz⁽³⁾	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	78 ms	27.6 mA	7.1 mJ	Cube AI 7.0.0 Cube IDE 1.7.0

⁽¹⁾ On Cortex® M7 core in SMPS mode 400MHz instead of 480 max in LDO. The Cortex® M4 is running on a while(1) infinite loop.

⁽²⁾ The MCU core frequency is set to its maximum 280 MHz, but the HPRE prescaler is set to /2 to provide an HCLK/AXI frequency of 140 MHz instead of the maximum 280 MHz. Note that this setting might impact the rest of the system in a broader application like DMA transfer or ChromeART speed.

⁽³⁾ The MCU core frequency is set to 220 MHz and the HPRE prescaler is set to /2 to provide an HCLK/AXI frequency of 110 MHz to have an optimal power setting with limited impact on the latency.. In particular, the Voltage Scale power regulator can be set to VOS1 instead of VOS0. Note that this setting might impact the rest of the system in a broader application like DMA transfer or ChromeART speed.

For a given STM32 in a fixed configuration, the current consumption is in the same range regardless of the model. it might however vary depending on the complexity and topology of the model. The following table is providing the average current consumption of the model listed in the table above table (excluding the Anomaly Detection model which has a specific topology). These data can be used as a first estimation of the current consumption and the energy consumption of a new model from just the measurement of its inference time.

STM32 Board	STM32H723 550 MHz	STM32H735 SMPS 550 MHz	STM32H743 480 MHz	STM32H747 400 MHz SMPS	STM32H7A3 280 MHz	STM32H7A3 280 MHz AXI 140MHz⁽²⁾	STM32H7A3 220 MHz AXI 110MHz⁽³⁾
Average current (mA)	196	95	191	69	43	40	28

STM32Cube.AI can also generate a Tensor Flow Lite for Microcontroller runtime implementation (version 2.5.0 for STM32Cube.AI v7.0.0). The following table is comparing the TFLm runtime to the X-CUBE-AI runtime.

STM32 Board	STM32 characteristics	Model Source/Link	Runtime	Flash (KiB)	RAM (KiB)	Proc Time (ms)	Version
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Image Classif. v0.5 tfl MLPerf™Tiny	X-CUBE-AI	77 KB	49 KB	37 ms	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Image Classif. v0.5 tfl MLPerf™Tiny	TFL micro	96 KB	53 KB	61 ms	TFLm 2.5.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	X-CUBE-AI	214 KB	37 KB	31 ms	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H723 NUCLEO-H723ZG	Flash 1MB RAM 564KB (432) Freq 550MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	TFL micro	325 KB	98 KB	42 ms	TFLm 2.5.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Image Classif. v0.5 tfl MLPerf™Tiny	X-CUBE-AI	77 KB	49 KB	72 ms	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Image Classif. v0.5 tfl MLPerf™Tiny	TFL micro	96 KB	53 KB	120 ms	TFLm 2.5.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	X-CUBE-AI	214 KB	37 KB	61 ms	Cube AI 7.0.0 Cube IDE 1.7.0
STM32H7A3 SMPS NUCLEO-H7A3ZI-Q	Flash 2MB RAM 1.4MB (1.18) Freq 280MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	TFL micro	325 KB	98 KB	84 ms	TFLm 2.5.0 Cube IDE 1.7.0

1.2. STM32 Ultra Low Power

STM32 Board	STM32 characteristics	Model Source/Link	Flash Wgt.	RAM Buf.	Proc Time	Cur. (mA)	Energy (mJ) 3.3V	Version
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	249 ms	10 mA	8.2 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	250 ms	9.1 mA	7.5 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	468 ms	9.4 mA	14.5 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	5.7 ms	9.1 mA	0.17 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	61 ms	10 mA	2 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	164 ms	9 mA	4.9 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	157 ms	9.1 mA	4.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	361 ms	5.7 mA	6.8 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	363 ms	5.6 mA	6.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	681 ms	5.8 mA	13 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	8.3 ms	5.6 mA	0.16 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	88.2 ms	5.8 mA	1.7 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	239 ms	5.6 mA	4.4 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 110MHz⁽⁴⁾	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	229 ms	5.7 mA	4.3 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	420 ms	23 mA	32 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	433 ms	23 mA	33 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	781 ms	24 mA	63 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	9 ms	22 mA	0.66 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	104 ms	24 mA	8.3 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	255 ms	24 mA	20 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Single Bank RAM 640KB Freq 120MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	260 ms	23 mA	20 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	MobileNet v1 0.25 128 quant tfl source	468 KB	66 KB	427 ms	24 mA	34 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	FoodReco quant h5 deriv MobileNet FP-AI-VISION1	132 KB	148 KB	455 ms	24 mA	36 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	Person Presence MobileNet v2 128 FP-AI-VISION1	403 KB	197 KB	813 ms	25 mA	66 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	9.7 ms	23 mA	0.73 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	111 ms	24 mA	9 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	263 ms	25 mA	22 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32L4R5 NUCLEO-L4R5ZI	Flash 2MB Dual Bank RAM 640KB Freq 120MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	270 ms	24 mA	21 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32WB55 SMPS NUCLEO-WB55RG	Flash 1MB RAM 256KB Freq 64MHz	Anomaly Detection v0.5 tfl MLPerf™Tiny	265 KB	0.75 KB	17 ms	9.8 mA	0.55 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32WB55 SMPS NUCLEO-WB55RG	Flash 1MB RAM 256KB Freq 64MHz	Key Word Spotting v0.5 tfl MLPerf™Tiny	24 KB	18 KB	180 ms	11 mA	6.6 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32WB55 SMPS NUCLEO-WB55RG	Flash 1MB RAM 256KB Freq 64MHz	Image Classif. v0.5 tfl MLPerf™Tiny	77 KB	49 KB	457 ms	11 mA	16 mJ	Cube AI 7.0.0 Cube IDE 1.7.0
STM32WB55 SMPS NUCLEO-WB55RG	Flash 1MB RAM 256KB Freq 64MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	214 KB	37 KB	459 ms	11 mA	16 mJ	Cube AI 7.0.0 Cube IDE 1.7.0

⁽¹⁾ The MCU core frequency is set to 110 MHz, the Voltage Scale power regulator can then be set to VOS2 instead of VOS1. Note that this setting might impact the rest of the system in a broader application like DMA transfer or ChromeART speed.

The following table is providing the average current consumption of the model listed in the table above table (excluding the Anomaly Detection model which has a specific topology). These data can be used as a first estimation of the current consumption and the energy consumption of a new model from just the measurement of its inference time.

STM32 Board	STM32U585 160 MHz	STM32U585 110 MHz⁽⁴⁾	STM32L4R5 120 MHz Single Bank	STM32L4R5 120 MHz Dual Bank	STMWB55 64 MHz
Average current (mA)	9.5	5.7	23.7	24.3	10.8

STM32Cube.AI can also generate a Tensor Flow Lite for Microcontroller runtime implementation (version 2.5.0 for STM32Cube.AI v7.0.0). The following table is comparing the TFLm runtime to the X-CUBE-AI runtime.

STM32 Board	STM32 characteristics	Model Source/Link	Runtime	Flash (KiB)	RAM (KiB)	Proc Time (ms)	Version
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Image Classif. v0.5 tfl MLPerf™Tiny	X-CUBE-AI	77 KB	49 KB	164 ms	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Image Classif. v0.5 tfl MLPerf™Tiny	TFL micro	96 KB	53 KB	315 ms	TFLm 2.5.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	X-CUBE-AI	214 KB	37 KB	157 ms	Cube AI 7.0.0 Cube IDE 1.7.0
STM32U585 SMPS B-U585I-IOT02A	Flash 2MB RAM 786KB Freq 160MHz	Visual Wake Word v0.5 tfl MLPerf™Tiny	TFL micro	325 KB	98 KB	216 ms	TFLm 2.5.0 Cube IDE 1.7.0

2. Measure process

On this benchmark only the machine learning model inference processing is reported. In a complete application, the sensor acquisition, the data conditioning and pre-processing shall also be considered.

The STM32 Board column indicates the STM32 reference and the board used for measurement. By default, the STM32 is configured in maximum performance configuration, so with maximum frequency and especially HCLK / AXI clock at maximal frequency. When a different setting is used it is specified (for instance lower frequency to use a different Voltage Scale or for STM32H7, lower HCLK/AXI frequency). When SMPS is indicated it means that the internal voltage regulator used is the SMPS (Switched-Mode Power Supply) step-down converter instead of the LDO (Linear Voltage Regulator).

The STM32 Characteristics column provides the available internal Flash size, the full internal RAM size and the frequency. The RAM size includes the different kind of memories and banks, TCM, SRAM etc. For the time being, the buffers used by X-CUBE-AI shall be placed in a continuous memory area, the maximal RAM size available in continuous area is provided between "()" if not equal to the full size. The frequency indicated is the operating frequency used for the benchmark, so generally the maximal frequency. The only different case is with the STM32H747 Discovery Kit which is operating by default in SMPS power mode and therefore is limited to 400 MHz instead of 480 MHz. Data are rounded to 3 decimals.

The memory footprints are the one reported by X-CUBE-AI using the "Analyze" function (the version of X-CUBE-AI used is mentioned in the table).

The column Model Source/Links indicates the pre-trained ML model and the source, either how it was built / trained or where it can be downloaded. tfl stands for TensorFlow™ Lite .tflite model , h5 stands for Keras .h5 model, quant for quantized models on 8 bits. For FP-AI-VISION1 models, they are located in the package directory: FP-AI-VISION1_V3.0.0\Utilities\AI_resources.

The column Flash reports the Flash occupancy including the model weights, the runtime code generated by X-CUBE-AI to run the neural network and its constants (including the initialized tables).

The column RAM Buf. reports the RAM buffers occupancy, used to store the model activations as well as input and output buffers, and the RAM required by the runtime to inference the model. Note that to gain RAM space the "Use activation buffer for input buffer" and "Use activation buffer for the output buffer" options are selected (through X-CUBE-AI Advanced Settings panel).

The Flash and RAM memory footprint related to the runtime/code execution are computed from the memory map once the X-CUBE-AI validation project for the given model has been built with STM32CubeIDE For X-CUBE-AI runtime, the runtime/code part is computed taking into account NetworkRuntime700_CMx_GCC.a, libc_nano.a and network.o memory footprints. For Tensor Flow Lite for microcontroller runtime, the runtime/code part is computed taking into account all the module used by tflite_micro and libc_nano.a.

The column Proc Time reports the model inference processing time. When the current / energy is indicated the measure is done thanks to X-CUBE-AI "System Performance" application following the process described on this WiKi article on power measurement. Otherwise the "Validation on target" application is used. In all case, when generating the application, the selected clock source is always the HSI, X-CUBE-AI is generating first the optimal clock settings and eventually afterwards the clock is set to HSI. STM32CubeMX then autonomously reconfigures the clock settings.

Cur. and Energy is the current and energy computed following the process describe in the WiKi article on power measurement. For STM32 Ultra Low Power microcontrollers, measures are done with the X-NUCLEO-LPM01A power shield as described in the section 4.3.1 "Measure process when current is below 50 mA". For STM32 High Performance microcontrollers measures are done with the Qoitec Otii Arc power analyzer as described in the section 4.3.2 Measure process when current is above 50 mA. In both cases, a 10 s windows is used for averaging) and HSI is selected as clock source.

Accuracy is not reported. X-CUBE-AI is not modifying the DL/ML model topology. The impact on accuracy should be limited. X-CUBE-AI is providing through the "Validation" application a way to measure the accuracy either on x86 or on the target. It can be used to check the eventual impact on accuracy. When running the "Validation on target" application several metrics are computed, one of them is the X-Cross providing error metrics between the original model executed in Python and the C model executed on the target. Random data can be used to compute the RMSE/MAE/L2R errors, however it is recommended to use true data to get the final accuracy. For more details on the metrics, please refer to the X-CUBE-AI Embedded Documentation.

Note that accuracy check is important to compare a float model to a quantize model or when using the Weight compression feature of X-CUBE-AI for float models.

STM32Cube.AI model performances

Contents

1. Benchmark Results

1.1. STM32 High Performance

1.2. STM32 Ultra Low Power

2. Measure process