STMicroelectronics has extended its STM32F4 microcontroller series at the entry level, introducing devices with more memory and extra features as well as the first STM32F4 MCUs qualified to 125°C. An update to its quick-start Discovery Kit adds support for the new features.

The new STM32F412 and high-temperature STM32F410 MCUs offer more choices within the economical Access Lines, which feature the 84MHz (STM32F401 line) and 100MHz (STM32F410/F411/F412 lines) ARM Cortex-M4 cores and 128KB to 1MB Flash with up to 256KB RAM. The Access Lines offer scalability to both STM32F4 Foundation Line and Advanced Line devices.

 
STM32F412 Figure 1: The STM32F410 begins a roadmap that will ultimately qualify all STM32F4 Access Line MCUs to 125°C.  

The STM32F412 comes with high-performance interfaces to off-chip memory via dual-mode 100MHz Quad-SPI and a Flexible Memory Controller (FMC) for static memory that allow efficient expansion of the integrated 1MB Flash and 256KB RAM. There is also an LCD parallel interface, which allows managing displays up to QVGA resolution with 16bit color depth or WQVGA with 8bit depth.

A True Random Number Generator (TRNG) adds support for performing security algorithms, such as cryptography. ST has also updated the USB OTG port they use in the current Access Lines with Link Power Management (LPM) and dual power rails that help save circuit-board space by eliminating level shifters.

The STM32F410 begins a roadmap that will ultimately qualify all STM32F4 Access Line MCUs to 125°C. Like other Access Line MCUs, both the STM32F410 and STM32F412 support Direct Memory Access (DMA) Batch Acquisition Mode (BAM) to capture data without waking the CPU in power-conscious applications. In addition, digital filters for four low-power microphone channels allow efficient hosting of speech-recognition algorithms with lower power consumption and low CPU loading.

 
ST DiscoveryKit Figure 2: The enhanced Discovery Kit, STM32F412G-DISCO, has a 1.54-inch touchscreen color LCD to help with HMI development.  

ST has added features to the supporting STM32F412 Discovery Kit (STM32F412G-DISCO). Its new 1.54-inch touchscreen color LCD simplifies HMI development and it has on-board stereo digital MEMS microphones, an I2S codec and headphone, microphone and speaker connections, and Arduino Uno expansion connectors. A low-cost STM32 Nucleo board (NUCLEO-F412ZG) is also available, featuring a 144-pin STM32F412ZG MCU.

The STM32F412 is available for $3.60 for 10,000 pieces, in UQFN48 package; the STM32F410 for $1.71 for 10,000 pieces in the WLCSP package, qualified for 85°C operation. The Discovery Kit is priced at $25.