The ultra-low-power STM32L151xC/C-A and STM32L152xC/C-A devices incorporate the connectivity power of the universal serial bus (USB) with the high-performance ARM Cortex -M3 32-bit RISC core operating at a frequency of 32 MHz (33.3 DMIPS), a memory protection unit (MPU), high-speed embedded memories (Flash memory up to 256 Kbytes and RAM up to 32 Kbytes), and an extensive range of enhanced I/Os and peripherals connected to two APB buses.The STM32L151xC/C-A and STM32L152xC/C-A devices offer two operational amplifiers, one 12-bit ADC, two DACs, two ultra-low-power comparators, one general-purpose 32-bit timer, six general-purpose 16-bit timers and two basic timers, which can be used as time bases.Moreover, the STM32L151xC/C-A and STM32L152xC/C-A devices contain standard and advanced communication interfaces: up to two I²Cs, three SPIs, two I²S, three USARTs, and an USB. The STM32L151xC/C-A and STM32L152xC/C-A devices offer up to 23 capacitive sensing channels to simply add a 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 STM32L151xC/C-A devices) has a built-in LCD voltage generator that allows to drive up to 8 multiplexed LCDs with the contrast independent of the supply voltage.The ultra-low-power STM32L151xC/C-A and STM32L152xC/C-A 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. They are available in the -40 to +85 °C and -40 to +105 °C temperature ranges. A comprehensive set of power-saving modes allows the design of low-power applications.
Ultra-low-power platform
1.65 V to 3.6 V power supply
-40°C to 105°C temperature range
305 nA standby mode (3 wakeup pins)
1.15 µA standby mode + RTC
0.475 µA stop mode (16 wakeup lines)
1.35 µA stop mode + RTC
11 µA Low-power run mode
230 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
Up to 23 capacitive sensing channels
CRC calculation unit, 96-bit unique ID
Reset and supply management
Low-power, ultrasafe 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
USB and USART supported
Serial wire debug, JTAG and trace
Up to 116 fast I/Os (102 I/Os 5V tolerant), all mappable on 16 external interrupt vectors
Memories
256 KB Flash with ECC
32 KB RAM
8 KB of true EEPROM with ECC
128B backup register
LCD driver (except STM32L151xC/C-A devices) up to 8×40 segments, contrast adjustment, blinking mode, step-up converter
Rich analog peripherals (down to 1.8V)
2x operational amplifiers
12-bit ADC 1 Msps up to 40 channels
12-bit DAC 2 ch with output buffers
2x ultra-low-power-comparators(window mode and wake up capability)
DMA controller 12x channels
9x peripheral communication interfaces
1x USB 2.0 (internal 48 MHz PLL)
3x USART
3x SPI 16 Mbits/s (2x SPI with I2S)
2x I2C (SMBus/PMBus)
11x timers: 1x 32-bit, 6x 16-bit with up to 4 IC/OC/PWM channels, 2x 16-bit basic timers, 2x watchdog timers (independent and window)
