UM1759 datasheet(11/50 Pages) STMICROELECTRONICS

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UM1759

Hardware description

Figure 8. STEVAL-IKR002Vx (RF motherboard)

3.1.1

Microcontroller and connections

The board has an STM32L151RB microcontroller. It’s an ultra-low-power microcontroller

with 128 KB of flash memory, 16 KB of RAM, 32-bit core ARM cortex-M3, 4 KB of data

EEPROM, RTC, LCD, timers, USART, I2C, SPI, ADC, DAC and comparators.

The microcontroller is connected to different components including buttons, LEDs and

connectors for external circuitry.

3.1.2

Power

The board can be powered either by the mini USB connector CN1 (area A in Figure 8) or by

two AAA batteries. To power the board via the USB bus, place jumper JP1 in position 1-2

(area B in Figure 8). To power the board with batteries, place two AAA batteries in the

battery holder at the rear of the board and set jumper JP1 to position 2-3.

When the board is powered, the green LED DL6 is ON (area C in Figure 8).

The board can also be powered by an external DC power supply. Connect the positive

output of the power supply to the central pin of JP1 (pin 2) and the ground to one of the four

test point connectors on the motherboard.

3.1.3

Sensors

Two sensors are available on the motherboard:

•

LIS3DH; an ultra-low power, high performance three-axes linear accelerometer (area D

in Figure 8). The sensor is connected to the STM32L through the SPI interface. Two

lines for interrupts are also connected.

•

STLM75; a high-precision digital CMOS temperature sensor, with I2C interface (area E

in Figure 8). The pin for the alarm function is connected to one of the STM32L GPIOs.

3.1.4

Extension connector

You can solder a connector on the motherboard to extend its functionality (area F in

Figure 8). 16 pins of the microcontroller are connected to this expansion slot.

UM1759 Datasheet(PDF) 11 Page - STMicroelectronics