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UM1820 User manual Getting started with motion MEMS and environmental sensor expansion board for STM32 Nucleo Introduction The X-NUCLEO-IKS01A1 is a MEMS inertial and environmental sensor evaluation board which can be used to expand the STM32 Nucleo system. It is also compatible with the Arduino UNO R3 connector layout and is designed around the STMicroelectronics 3-axis accelerometer plus 3-axis gyroscope (LSM6DS0), 3-axis magnetometer (LIS3MDL), humidity (HTS221) and pressure (LPS25HB*) sensors. The X-NUCLEO-IKS01A1 interfaces with the STM32 MCU via the I²C pin, and the user can change the default I²C port. This document details the hardware requirements and board connections for the X- NUCLEO-IKS01A1 MEMS and environmental sensor expansion board for STM32 Nucleo. Figure 1. X-NUCLEO-IKS01A1 evaluation board May 2015 DocID026959 Rev 4 1/14 www.st.com 14

Contents Contents UM1820 1 2 3 4 5 6 Getting started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Hardware requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 1.1 System requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Hardware description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Board block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3.1 3.2 3.3 3.4 3.5 3.6 Sensor I²C address selection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Sensor current consumption measurement . . . . . . . . . . . . . . . . . . . . . . . . 6 Sensor disconnection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 DIP24 socket for adapter boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Board schematic and bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Bill of material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 4.1 4.2 Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 2/14 DocID026959 Rev 4

UM1820 Getting started 1 Getting started This section describes the hardware requirements for the X-NUCLEO-IKS01A1 evaluation board. 1.1 Hardware requirements The X-NUCLEO-IKS01A1 is an expansion board for use with STM32 Nucleo boards (please refer to UM1724 on www.st.com for further information). To function correctly, the STM32 Nucleo board must be connected to the X-NUCLEO-IKS01A1 board, as shown in Figure 2. Figure 2. X-NUCLEO-IKS01A1 mounted on a STM32 Nucleo board The connection between the STM32 Nucleo and the X-NUCLEO-IKS01A1 is designed for use with any STM32 Nucleo board or Arduino UNO R3 platform. When mounting the X-NUCLEO-IKS01A1 on the mainboard: ensure that all the pins are aligned with their corresponding connector It is very important to handle both boards carefully during this operation to avoid damaging or bending the male/female pins and connectors. ESD prevention measures must also be implemented to avoid damaging any X-NUCLEO- IKS01A1 board components. DocID026959 Rev 4 3/14 14

System requirements UM1820 2 System requirements Using the Nucleo boards with the X-NUCLEO-IKS01A1 expansion board requires the following software and hardware: • • a Windows® (XP, Vista, 7, 8) PC on which to install the software a USB type A to Mini-B USB cable to connect the Nucleo to the PC for installation of the board firmware package (order code: X-CUBE-IKS01A1). A utility running on the user's PC will complete the demo. The user’s PC must have the following characteristics: – – At least 128 MB of RAM 40 MB of available hard disk space for the X-CUBE-IKS01A1 firmware package and relative documentation, available on www.st.com 4/14 DocID026959 Rev 4

UM1820 Hardware description 3 Hardware description The board allows the user to test the functions of the STMicroelectronics motion MEMS accelerometer, gyroscope, magnetometer and environmental sensors for humidity, temperature and pressure. The devices used on the board are: – – – – LSM6DS0: MEMS 3D accelerometer (±2/4/8g) + 3D gyroscope (±245/500/2000dps) LIS3MDL: MEMS 3D magnetometer (±4/8/12/16 gauss) LPS25HB*: MEMS pressure sensor, 260-1260 hPa absolute digital output barometer HTS221: Capacitive digital relative humidity and temperature sensor The X-NUCLEO-IKS01A1 also has a DIL24 socket to connect and test additional sensors (i.e. UVI sensors, other MEMS sensor, etc…). The sensors are connected on a single bus via I²C and each device has a separate power supply to allow measurement of the power consumption of each single sensor. 3.1 Board block diagram Figure 3 shows a block diagram of the X-NUCLEO-IKS01A1 board. Figure 3. X-NUCLEO-IKS01A1 block diagram DocID026959 Rev 4 5/14 14

Hardware description UM1820 3.2 Sensor I²C address selection Most of the sensors allow selection of the LSB of the I²C address by pulling the SD0 pin low or high. The board has solder bridges to control the SD0 level. Table 1. Solder bridges for SD0 level control Sensor LIS3MDL (U1) LSM6DS0 (U2) LPS25HB* (U4) DIL24 Adapter (J1) SD0 High SB3 (default) SB7 (default) SB13 (default) SB15/SB17 SD0 Low SB4 SB8 SB14 SB16/SB18 (default) 3.3 Sensor current consumption measurement To measure the individual current consumption of each sensor, connect the ammeter at the appropriate jumper points. Use an ammeter with a low burden voltage and set it to a suitable range as the sensor current consumption is typically very low. Table 2. Jumpers for current consumption measurement Sensor LIS3MDL (U1) LSM6DS0 (U2) HTS221 (U3) LPS25HB* (U4) DIL24 Adapter (J1) Jumper JP1 JP2 JP3 JP4 JP5 3.4 Sensor disconnection To disconnect a sensor, disconnect the I²C bus as well as the power supply. Table 3 will help you identify the appropriate jumpers and solder bridges. Table 3. Link between sensors, jumpers and I²C solder bridges Sensor Power LIS3MDL (U1) LSM6DS0 (U2) HTS221 (U3) LPS25HB* (U4) JP1 JP2 JP3 JP4 SDA SB2 SB6 SB9 SB12 SCL SB1 SB5 SB10 SB11 6/14 DocID026959 Rev 4

UM1820 3.5 Hardware description DIP24 socket for adapter boards Sensors can be added via adapter boards connected to the DIL24 socket J1. Please visit www.st.com to find other sensors that are available. As there are various interrupt signal assignments to DIL24 pins, the appropriate pin can be selected using the JP6 header. 3.6 Connectors The pin assignments for the Arduino UNO R3 and the Morpho connectors are shown in Table 4 and Table 5 respectively. Table 4. Arduino UNO R3 connector table Connector CN5 CN6 CN8 CN9 Pin(1) 7 9 10 2 4 6 7 3 4 5 6 3 5 6 7 Signal GND I²C SDA I²C SCL 3.3V 3.3V GND GND INT1 (DIL24) INT2 (DIL24) LIS3MDL INT1 LIS3MDL DRDY USER INT (optional) LSM6DS0 INT1 LPS25HB* INT1 HTS221 DRDY Remarks - - - - 1. Any unlisted pins are not connected. DocID026959 Rev 4 7/14 14

Hardware description UM1820 Table 5. ST Morpho connector table Connector Pin(1) 12 16 20 22 32 34 36 38 3 5 25 27 29 33 CN7 CN10 1. Any unlisted pins are not connected. Remarks - - Signal 3.3V 3.3V GND GND INT1 (DIL24) INT2 (DIL24) LIS3MDL INT1 LIS3MDL DRDY I²C SCL I²C SDA HTS221 DRDY LPS25HB* INT1 LSM6DS0 INT1 USER INT (optional) 8/14 DocID026959 Rev 4

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