The ultra-low-power STM32L151xE and STM32L152xE 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 512 Kbytes and RAM up to 80 Kbytes), and an extensive range of enhanced I/Os and peripherals connected to two APB buses.
The STM32L151xE and STM32L152xE 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 STM32L151xE and STM32L152xE devices contain standard and advanced communication interfaces: up to two I2Cs, three SPIs, two I2S, three USARTs, two UARTs and an USB. The STM32L151xE and STM32L152xE devices offer up to 34 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 STM32L151xE 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 STM32L151xE and STM32L152xE 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.
**Key Features**
Ultra-low-power platform
1.65 V to 3.6 V power supply
-40 °C to 105 °C temperature range
290 nA Standby mode (3 wakeup pins)
1.11 µA Standby mode + RTC
560 nA Stop mode (16 wakeup lines)
1.4 µA Stop mode + RTC
11 µA Low-power run mode down to 4.6 µA in Low-power sleep mode
195 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 34 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
Internal 16 MHz oscillator factory trimmed RC(+/-1%) with PLL option
Internal low-power 37 kHz oscillator
Internal multispeed low-power 65 kHz to 4.2 MHz oscillator
PLL for CPU clock and USB (48 MHz)
Pre-programmed bootloader
USB and USART supported
Up to 116 fast I/Os (102 I/Os 5V tolerant), all mappable on 16 external interrupt vectors
Memories
512 Kbytes of Flash memory with ECC (with 2 banks of 256 Kbytes enabling RWW capability)
80 Kbytes of RAM
16 Kbytes of true EEPROM with ECC
128-byte backup register
LCD driver (except STM32L151xE devices) up to 8x40 segments, contrast adjustment, blinking mode, step-up converter
Rich analog peripherals (down to 1.8 V)
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
11x peripheral communication interfaces
1x USB 2.0 (internal 48 MHz PLL)
5x USARTs
Up to 8x SPIs (2x I2S, 3x 16 Mbit/s)
2x I2Cs (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)
Development support: serial wire debug, JTAG and trace
