STMicroelectronics STM32L4 series, STM32L412KBT6, ARM Cortex-M4 32-Bit Single-Core MCU, 80MHz, 128KB Flash, 40K x 8 RAM, I²C/SPI/UART/USB/Quad SPI, 32-LQFP, -40°C to 85°C.
| Parameter | Value |
|---|---|
| Series | STM32L4 |
| Mounting | Surface Mount |
| Oscillator type | Internal |
| Program memory type | FLASH |
| Voltage - supply (Vcc (Vdd)) | 1.71V ~ 3.6V |
| Operating temperature | -40°C ~ 85°C (TA) |
| Speed | 80MHz |
| Package | Tray |
| RAM size | 40K x 8 |
| Core size | 32-Bit Single-Core |
| Peripherals | Brown-out Detect/Reset, DMA, PWM, WDT |
| Connectivity | I²C, Infrared, IrDA, LINbus, Quad SPI, SPI, UART/USART, USB |
| Number of i (O) | 26 |
| Core processor | ARM® Cortex®-M4 |
| Case | 32-LQFP |
| Data converters | A/D 10x12b |
| Program memory size | 128KB (128K x 8) |
The internal oscillator trims out the external crystal for many applications, though the 32-LQFP package leaves room for a footprint if the application needs a precision RTC or USB clock.
The 10-channel 12-bit ADC, along with DMA and PWM timers, handles multi-axis sensor acquisition and motor-drive commutation without external ADC chips.
The STM32L151CBU6A is a functionally similar part from the STM32L1 series, but it runs a Cortex-M3 core at 32 MHz rather than the Cortex-M4 at 80 MHz. The has more I/O (37 vs 26) and includes a 2-channel DAC, but lacks the FPU and Quad SPI of the L412. They are not pin-compatible — the L151 comes in a UFQFPN-48 package versus the L412's 32-LQFP. The choice depends on whether you need the M4's DSP/FPU throughput or the 's lower power and wider I/O count.