Description
The STM32L4R5xx, STM32L4R7xx and STM32L4R9xx devices are an ultra-low-power microcontrollers family (STM32L4+ Series) based on the high-performance Arm® Cortex®-M4 32-bit RISC core. They operate at a frequency of up to 120 MHz.
The Cortex-M4 core features a single-precision floating-point unit (FPU), which supports all the Arm® single-precision data processing instructions and all the data types. The CortexM4 core also implements a full set of DSP (digital signal processing) instructions and a memory protection unit (MPU) which enhances the application’s security.
These devices embed high-speed memories (2 Mbytes of Flash memory and 640 Kbytes of SRAM), a flexible external memory controller (FSMC) for static memories (for devices with packages of 100 pins and more), two OctoSPI Flash memories interface (available on all packages) and an extensive range of enhanced I/Os and peripherals connected to two APB buses, two AHB buses and a 32-bit multi-AHB bus matrix.
The STM32L4Rxxx devices embed several protection mechanisms for embedded Flash memory and SRAM: readout protection, write protection, proprietary code readout protection and a firewall.
These devices offer a fast 12-bit ADC (5 Msps), two comparators, two operational amplifiers, two DAC channels, an internal voltage reference buffer, a low-power RTC, two general-purpose 32-bit timer, two 16-bit PWM timers dedicated to motor control, seven general-purpose 16-bit timers, and two 16-bit low-power timers. The devices support four digital filters for external sigma delta modulators (DFSDM). In addition, up to 24 capacitive sensing channels are available.
Features
• Ultra-low-power with FlexPowerControl
– 1.71 V to 3.6 V power supply
– -40 °C to 85/125 °C temperature range
– Batch acquisition mode (BAM)
– 305 nA in VBAT mode: supply for RTC and 32x32-bit backup registers
– 33 nA Shutdown mode (5 wakeup pins)
– 125 nA Standby mode (5 wakeup pins)
– 420 nA Standby mode with RTC
– 2.8 μA Stop 2 with RTC
– 110 μA/MHz Run mode (LDO mode)
– 43 μA/MHz Run mode (@ 3.3 V SMPS mode)
– 5 µs wakeup from Stop mode
– Brownout reset (BOR) in all modes except shutdown
– Interconnect matrix
• Core: Arm® 32-bit Cortex®-M4 CPU with FPU, adaptive real-time accelerator (ART Accelerator) allowing 0-wait-state execution from Flash memory, frequency up to 120 MHz, MPU, 150 DMIPS/1.25 DMIPS/MHz (Dhrystone 2.1), and DSP instructions
• Performance benckmark
– 1.25 DMIPS/MHz (Drystone 2.1)
– 409.20 Coremark® (3.41 Coremark/MHz @120 MHz)
• Energy benckmark
– 233 ULPMark™CP score
– 56.5 ULPMark™PP score
• Clock sources
– 4 to 48 MHz crystal oscillator
– 32 kHz crystal oscillator for RTC (LSE)
– Internal 16 MHz factory-trimmed RC (±1%)
– Internal low-power 32 kHz RC (±5%)
– Internal multispeed 100 kHz to 48 MHz oscillator, auto-trimmed by LSE (better than ±0.25 % accuracy)
– Internal 48 MHz with clock recovery
– 3 PLLs for system clock, USB, audio, ADC
• RTC with HW calendar, alarms and calibration
• Up to 24 capacitive sensing channels: support touchkey, linear and rotary touch sensors
• Advanced graphics features
– Chrom-ART Accelerator (DMA2D) for enhanced graphic content creation
– Chrom-GRC (GFXMMU) allowing up to 20% of graphic resources optimization
– MIPI® DSI Host controller with two DSI lanes running at up to 500 Mbits/s each
– LCD-TFT controller
• 16x timers: 2 x 16-bit advanced motor-control, 2 x 32-bit and 5 x 16-bit general purpose, 2x 16-bit basic, 2x low-power 16-bit timers (available in Stop mode), 2x watchdogs, SysTick timer
• Up to 136 fast I/Os, most 5 V-tolerant, up to 14 I/Os with independent supply down to 1.08 V
• Memories
– 2-Mbyte Flash, 2 banks read-while-write, proprietary code readout protection
– 640 Kbytes of SRAM including 64 Kbytes with hardware parity check
– External memory interface for static memories supporting SRAM, PSRAM, NOR, NAND and FRAM memories
– 2 x OctoSPI memory interface
• 4x digital filters for sigma delta modulator
