ST X-NUCLEO-IKS01A1 User manual

November 2014 DocID026959 Rev 1 1/14
14
UM1820
User manual
MEMS inertial 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 (LPS25H) sensors. The X-NUCLEO-IKS01A1 interfaces
with the STM32 MCU via the I
2
C pin, and the user can change the default I
2
C 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
www.st.com

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

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UM1820 Getting started
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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.

System requirements UM1820
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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

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UM1820 Hardware description
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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)
– LPS25H: 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 I
2
C 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
3.2 Sensor I²C address selection
Most of the sensors allow selection of the LSB of the I
2
C address by pulling the SD0 pin low
or high. The board has solder bridges to control the SD0 level.

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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.
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.
3.5 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.
Table 1. Solder bridges for SD0 level control
Sensor SD0 High SD0 Low
LIS3MDL (U1) SB3 (default) SB4
LSM6DS0 (U2) SB7 (default) SB8
LPS25H (U4) SB13 (default) SB14
DIL24 Adapter (J1) SB15/SB17 SB16/SB18 (default)
Table 2. Jumpers for current consumption measurement
Sensor Jumper
LIS3MDL (U1) JP1
LSM6DS0 (U2) JP2
HTS221 (U3) JP3
LPS25H (U4) JP4
DIL24 Adapter (J1) JP5
Table 3. Link between sensors, jumpers and I²C solder bridges
Sensor Power SDA SCL
LIS3MDL (U1) JP1 SB2 SB1
LSM6DS0 (U2) JP2 SB6 SB5
HTS221 (U3) JP3 SB9 SB10
LPS25H (U4) JP4 SB12 SB11

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UM1820 Hardware description
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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 Pin
(1)
1. Any unlisted pins are not connected.
Signal Remarks
CN5
7GND
-9I
2
C SDA
10 I
2
C SCL
CN6
23.3V
-
43.3V
6GND
7GND
CN8
3 INT1 (DIL24)
-
4 INT2 (DIL24)
5 LIS3MDL INT1
6 LIS3MDL DRDY
CN9
3 USER INT (optional)
-
5 LSM6DS0 INT1
6 LPS25H INT1
7 HTS221 DRDY

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Table 5. ST Morpho connector table
Connector Pin
(1)
1. Any unlisted pins are not connected.
Signal Remarks
CN7
12 3.3V
-
16 3.3V
20 GND
22 GND
32 INT1 (DIL24)
34 INT2 (DIL24)
36 LIS3MDL INT1
38 LIS3MDL DRDY
3I
2
C SCL
-
CN10
5I
2
C SDA
25 HTS221 DRDY
27 LPS25H INT1
29 LSM6DS0 INT1
33 USER INT (optional)

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UM1820 Board schematic and bill of material
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4 Board schematic and bill of material
This section contains the bill of material, schematic and layout of the X-NUCLEO-IKS01A1.
4.1 Bill of material
Table 6. X-NUCLEO-IKS01 bill of material
Quantity Designator Value Part number Comment Package
reference
5C1, C2, C4, C7,
C8 100nF CAP CER 0603
100nF 25V X7R
10% 0603
2 C3, C5 10uF CAP CER 0805 10uF 10V X7R
10% 0805
1 C6 10nF CAP CER 0603 10nF 25V X7R
10% 0603
1C94.7uF
CAP CER 0805
4.7uF 16V X7R
10% 0805
1 CN5 Header 10x1 Extra-long 10 pins
female-male strip Female side mounted to the top HDR1X10
2 CN6, CN9 Header 8x1 Extra-long 8 pins
female-male strip Female side mounted to the top HDR1X8
2 CN7, CN10 Header 19x2 Header, 19-Pin,
Dual row Not mounted HDR2X19
1 CN8 Header 6x1 Extra-long 6 pins
female-male strip Female side mounted to the top HDR1X6
1 J1 DIL24 Socket DIL24 Socket DIL24
5JP1, JP2, JP3,
JP4, JP5 Header 2x1 Header 1x2 pins,
2.54mm, straight HDR1x2
1 JP6 Header 4x2 Header 2x4 pins,
2.54mm, straight HDR2x4
2 R1, R2 4k7 RES 06034k71%
1/16W 0603
1R32k2
RES 06032k21%
1/16W 0603

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SB1, SB2, SB3,
SB5, SB6, SB7,
SB9, SB10,
SB11, SB12,
SB13, SB16,
SB18, SB19,
SB20, SB21,
SB22, SB23,
SB24, SB25,
SB26, SB27,
SB28
Solder Bridge R0603 0R Close 0603
5SB4, SB8, SB14, SB15,
SB17 Solder Bridge Open 0603
3 TP1, TP2, TP3 Header 1x1 Header 1x1 pins,
2.54mm, straight Not mounted
1 U1 LIS3MDL LIS3MDL ST-SUPPLY LGA 2x2 12L
1 U2 LSM3DS0 LSM6DS0 ST-SUPPLY LGA 3x3 16L
1 U3 HTS221 HTS221 ST-SUPPLY HLGA 2x2 6L
1 U4 LPS25H LPS25H ST-SUPPLY HCLGA 2.5x2.5
10L
Table 6. X-NUCLEO-IKS01 bill of material (continued)
Quantity Designator Value Part number Comment Package
reference