UM1657 datasheet(10/48 Pages) STMICROELECTRONICS

10 / 48 page

Hardware description

UM1657

10/48

DocID025094 Rev 1

battery holder in the rear of the board and the jumper JP1 must be set in position 2-3.

When the board is powered, the green LED DL6 is ON, Figure 1 (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 the ground to one of the four

test point connectors on the motherboard.

1.1.4

Sensors

Two sensors are available on the motherboard:

–

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

in Figure 1). 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 1). The pin for the alarm function is connected to one of the STM32L

GPIOs.

1.1.5

Extension connector

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

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

1.1.6

Daughter board test point

In M Figure 1, a row of test point is available to the user for debugging and testing. The list

of signals available is:

GND

VDD

GPIO SDN (the pin to drive in SHUTDOWN the SPIRIT1)

SPI CSn

SPI MISO

SPI MOSI

SPI SCKL

SPIRIT1 GPIO2

SPIRIT1 GPIO3

10. SPIRIT1 GPIO1

11. SPIRIT1 GPIO0

12. GND.

1.1.7

Push buttons and joystick

For user interaction the board has two buttons and a joystick. One is to reset the

microcontroller; the other one is available to the application. There is also a digital joystick

with 4 possible positions (left, right, up, down) (G in Figure 1).

1.1.8

JTAG connector

A JTAG connector on the board (H in Figure 1) allows programming and debugging of the

STM32L microcontroller on board, using an in-circuit debugger and programmer like the ST-

LINK/V2.

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