UM1870 datasheet(10/58 Pages) STMICROELECTRONICS

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Hardware description

UM1870

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DocID027602 Rev 1

2.1.2

Power

The board can be powered either by the mini USB connector CN1 (A in Figure 2) or by 2

AAA batteries. To power the board through USB bus, jumper JP1 must be in position 1-2, as

in Figure 2 (B). To power the board using batteries, 2 AAA batteries must be inserted in the

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

When the board is powered, the green LED DL6 is on (C).

If needed, the board can 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 ground to one of the four test

point connectors on the motherboard (TP1, TP2, TP3 and TP4).

2.1.3

Sensors

Two sensors are available on the motherboard:

–

LIS3DH, an ultra-low power high performance three-axis linear accelerometer (D

in Figure 2). 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 (E

in Figure 2). The pin for the alarm function is connected to one of the STM32L

GPIOs.

2.1.4

Extension connector

There is the possibility to solder a connector on the motherboard to extend its functionality

(F in Figure 2). 16 pins of the microcontroller are connected to this expansion slot (Table 1).

2.1.5

Push-buttons and joystick

For user interaction the board has two buttons. One is to reset the microcontroller, while the

other is available to the application. There is also a digital joystick with 4 possible positions

(left, right, up, down) (G in Figure 2).

2.1.6

JTAG connector

A JTAG connector on the board (H in Figure 2) allows the programming and debugging of

the STM32L microcontroller on board(a), using an in-circuit debugger and programmer such

as the ST-LINK/V2.

BOOT0

PB8

PB9

VSS_3

VDD_3

These lines are also available on the test point row

Table 1. MCU pin description versus board function (continued)

name

Board function

LEDs

DB connector

Buttons /

joystick

Acceler.

Temp.

sensor

USB

JTAG

Ext.

conn

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