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UM1870 Datasheet(PDF) 10 Page - STMicroelectronics |
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UM1870 Datasheet(HTML) 10 Page - STMicroelectronics |
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10 / 58 page  Hardware description UM1870 10/58 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 60 PB8 61 4 PB9 62 6 VSS_3 63 VDD_3 64 1. These lines are also available on the test point row Table 1. MCU pin description versus board function (continued) Pin name Pin Board function LEDs DB connector Buttons / joystick Acceler. Temp. sensor USB JTAG Ext. conn |
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