Description
The ultra-low-power STM32L151x6/8/B and STM32L152x6/8/B devices incorporate the connectivity power of the universal serial bus (USB) with the high-performance ARM® Cortex®-M3 32-bit RISC core operating at 32 MHz frequency (33.3 DMIPS), a memory protection unit (MPU), high-speed embedded memories (Flash memory up to 128 Kbytes and RAM up to 16 Kbytes) and an extensive range of enhanced I/Os and peripherals connected to two APB buses.
All the devices offer a 12-bit ADC, 2 DACs and 2 ultra-low-power comparators, six general purpose 16-bit timers and two basic timers, which can be used as time bases.
Moreover, the STM32L151x6/8/B and STM32L152x6/8/B devices contain standard and advanced communication interfaces: up to two I2Cs and SPIs, three USARTs and a USB. The STM32L151x6/8/B and STM32L152x6/8/B devices offer up to 20 capacitive sensing channels to simply add touch sensing functionality to any application.
They also include a real-time clock and a set of backup registers that remain powered in Standby mode.
Finally, the integrated LCD controller (except STM32L151x6/8/B devices) has a built-in LCD voltage generator that allows to drive up to 8 multiplexed LCDs with contrast independent of the supply voltage.
The ultra-low-power STM32L151x6/8/B and STM32L152x6/8/B devices operate from a 1.8 to 3.6 V power supply (down to 1.65 V at power down) with BOR and from a 1.65 to 3.6 V power supply without BOR option. It is available in the -40 to +85 °C temperature range, extended to 105°C in low power dissipation state. A comprehensive set of power-saving modes allows the design of low-power applications.

Features
• Ultra-low-power platform
   – 1.65 V to 3.6 V power supply
   – -40°C to 85°C/105°C temperature range
   – 0.3 µA Standby mode (3 wakeup pins)
   – 0.9 µA Standby mode + RTC
   – 0.57 µA Stop mode (16 wakeup lines)
   – 1.2 µA Stop mode + RTC
   – 9 µA Low-power run mode
   – 214 µA/MHz Run mode
   – 10 nA ultra-low I/O leakage
   – < 8 µs wakeup time
• Core: ARM® Cortex®-M3 32-bit CPU
   – From 32 kHz up to 32 MHz max
   – 1.25 DMIPS/MHz (Dhrystone 2.1)
   – Memory protection unit
• Reset and supply management
   – Ultra-safe, low-power BOR (brownout reset) with 5 selectable thresholds
   – Ultra-low-power POR/PDR
   – Programmable voltage detector (PVD)
• Clock sources
   – 1 to 24 MHz crystal oscillator
   – 32 kHz oscillator for RTC with calibration
   – High Speed Internal 16 MHz factory trimmed RC (+/- 1%)
   – Internal low-power 37 kHz RC
   – Internal multispeed low-power 65 kHz to 4.2 MHz
   – PLL for CPU clock and USB (48 MHz)
• Pre-programmed bootloader
   – USART supported
• Development support
   – Serial wire debug supported
   – JTAG and trace supported
• Up to 83 fast I/Os (73 I/Os 5V tolerant), all mappable on 16 external interrupt vectors
• Memories
   – Up to 128 Kbytes Flash memory with ECC
   – Up to 16 Kbytes RAM
   – Up to 4 Kbytes of true EEPROM with ECC
   – 80-byte backup register
• LCD Driver (except STM32L151x/6/8/B devices) for up to 8x40 segments
   – Support contrast adjustment
   – Support blinking mode
   – Step-up converter on board
• Rich analog peripherals (down to 1.8 V)
   – 12-bit ADC 1 Msps up to 24 channels
   – 12-bit DAC 2 channels with output buffers
   – 2x ultra-low-power-comparators (window mode and wake up capability)
• DMA controller 7x channels
• 8x peripheral communication interfaces
   – 1x USB 2.0 (internal 48 MHz PLL)
   – 3x USARTs (ISO 7816, IrDA)
   – 2x SPIs 16 Mbit/s
   – 2x I2Cs (SMBus/PMBus)
• 10x timers: 6x 16-bit with up to 4 IC/OC/PWM channels, 2x 16-bit basic timers, 2x watchdog timers (independent and window)
• Up to 20 capacitive sensing channels supporting touchkey, linear and rotary touch sensors
• CRC calculation unit, 96-bit unique ID