This is low cost development board for the new STM32L series of ultra low power microcontrollers of ST Microelectronics. STM32-H152 covers STM32L152VBT6. This board was carefully designed to low power handheld operation, with Li-ion battery charges on board and USB it's perfect to make data loggers. The 32khz crystal allow RTC implementation. FEATURES • MCU: STM32L152VBT6 ARM 32bit CORTEX M3™ with 128K Bytes Program Flash, 16K Bytes RAM, USB, LCD, I2C, SPI, USART, 32 Mhz clock, 80 GPIO, 1.8-3.6V power supply • Standard JTAG connector with ARM 2x10 pin layout for programming/debugging with ARM-JTAG • Li-ion battery charger • USB connector • UEXT connector • Wake-up user button • RESET button and circuit • Two status LED • Power supply LED • On board voltage regulator 3.3V with up to 800mA current • Single power supply: takes power from USB port or extension connector pin • 8 Mhz crystal oscillator • 32768Hz crystal and RTC backup battery connector • Extension headers for all uC ports • PCB: FR-4, 1.5 mm (0,062"), red soldermask, silkscreen component print • Dimensions: 70x 50mm (2.75 x 2.0") • Distance between the exntension connectors: 38.1 mm (1.5")