ST UM3039 Manuale utente

Introduction

The X-STM32MP-IOT01A is a 40-pin connector expansion board for the STM32MP157F-DK2 discovery kit. The board features

the SPIRIT1 SPSGRF-915 RF module for Sub-1 GHz RF communication and the LSM6DSOX iNEMO inertial module for IoT

applications.

The X-STM32MP-IOT01A interfaces with the STM32MP157F-DK2 microprocessor via GPIO connector pins. It uses SPI, I²C,

GPIO connections for SPSGRF-915, iNEMO inertial module, switches, and LED.

The expansion board is compatible with both the STM32MP157F-DK2 and Raspberry Pi GPIO connector layout.

Figure 1. X-STM32MP-IOT01A expansion board

Getting started with the X-STM32MP-IOT01A expansion board for the

STM32MP157F-DK2 discovery kit

UM3039

User manual

UM3039 - Rev 1 - June 2022

For further information contact your local STMicroelectronics sales office. www.st.com

1Safety precautions

The X-STM32MP-IOT01A expansion board is powered via a standard 3.3 V supply through the GPIO connector

of the STM32MP157F-DK2.

Important: Ensure that the DC supply used is compliant with the safety standards required in the region of operation.

UM3039

Safety precautions

UM3039 - Rev 1 page 2/23

2Overview

The X-STM32MP-IOT01A operates in the 915 MHz ISM band.

The LSM6DSOX iNEMO inertial module is used for the motion detection.

The X-STM32MP-IOT01A interfaces with the STM32MP157F-DK2 via the 40-pin GPIO connector pins. It uses

SPI, I²C, and GPIO connections for the SPSGRF-915,LSM6DSOX, keys, and LED.

Figure 2. System block diagram

The X-STM32MP-IOT01A on-board devices are controlled through the STM32MP157F-DK2 using various

peripheral pins available on the GPIO connector.

The SPSGRF-915 interfaces with the STM32MP157F-DK2 using the SPI.

The I²C interface is used to interact with the LSM6DSOX.

The RGB LED and switches control through GPIOs is used for the user interface. Table 6 shows the configuration

of the GPIO connector pins to connect the various devices.

The X-STM32MP-IOT01A embeds the following key devices:

•SPSGRF-915: based on the SPIRIT1 device, which is a low data rate, low-power sub-GHz transceiver.

The SPIRIT1 operates both in the license-free ISM and SRD frequency bands at 169, 433,868 MHz, and

915 MHz. The SPSGRF-915 module is an FCC and IC certified module (FCC ID: S9NSPSGRF and IC:

8976C-SPSGRF). It interfaces with the STM32 Nucleo development boards through an SPI interface and

some GPIOs. The SPSGRF-915 module also integrates the BALF-SPI-01D3 balun and a chip antenna.

Table 1. SPSGRF-915 details

Order code Package Operating voltage

SPSGRF-915 SMD 11 pin 1.8 to 3.6 V

UM3039

Overview

UM3039 - Rev 1 page 3/23

•M24C32-RMN6TP: a 32-Kbit I²C-compatible EEPROM organized as 4 K x 8 bits. The following table shows

the various features of this EEPROM package.

Table 2. M24C32-R package details

Order code Operating voltage Ambient temperature

M24C32-W 2.5 to 5.5 V -

-M24C32-R 1.8 to 5.5 V -

M24C32-F 1.7 to 5.5 V 40°C/+85°C

M24C32-DF 1.7 to 5.5 V 40°C/+85°C

M24C32-X 1.6 to 5.5 V -20°C/+85°C

Table 3. M24C32-RMN6TP details

Order code Package Operating voltage

M24C32-RMN6TP SO-8 1.8 to 5.5 V

•LSM6DSOX: features a 3-axis digital accelerometer and a 3-axis digital gyroscope with a 0.55 mA boost

performance in high-performance mode. It enables always-on low-power features for an optimal motion

experience for the consumer. The LSM6DSOX has a full-scale acceleration range of ±2/±4/±8/±16 g and an

angular rate range of ±125/±250/±500/±1000/±2000 dps. It fully supports EIS and OIS applications as the

module includes a dedicated configurable signal processing path for OIS and the auxiliary SPI, configurable

for both the gyroscope and accelerometer.

Table 4. LSM6DSOX details

Order code Package Operating voltage

LSM6DSOX LGA-14L 1.71 to 3.6 V

• RGB LED (SML-LX0404SIUPGUSB): used as an output to detect any error from the devices.

• Two push-button switches: used for the user's inputs.

2.1 EEPROM (M24C32-RMN6TP)

The EEPROM communicates with the X-STM32MP-IOT01A through I²C signals.

The J4 jumper J4 makes the device write-enabled.

The device can perform the read and write operations by setting the jumpers as detailed in the following table.

Table 5. Jumper settings

Jumper EEPROM

1-2 WRITE_ENABLE

2-3 (default) WRITE_DISABLE

UM3039

EEPROM (M24C32-RMN6TP)

UM3039 - Rev 1 page 4/23

Figure 3. EEPROM section

2.2 GPIO connector

The X-STM32MP-IOT01A on-board devices are controlled through the STM32MP157F-DK2 using various

peripheral pins available on the GPIO connector.

The series resistors are used to isolate the GPIO connector pins.

UM3039

GPIO connector

UM3039 - Rev 1 page 5/23

Figure 4. GPIO connector circuit

LED_RGB_RED

LSM6DSOX_SCL

LED1

LSM6DSOX_INT1

SPSGRF_CS

EEPROM_ID_SC

SPSGRF_MOSI

SPSGRF_SCLK

LED_RGB_BLUE

SPSGRF_GPIO1

SPSGRF_GPIO0

EEPROM_ID_SD

SPSGRF_MISO

SWITCH_2

SWITCH_1

LSM6DSOX_SDA

LED_RGB_GREEN

LSM6DSOX_INT2

SPSGRF_GPIO3

SPSGRF_SDN

3V3

SPSGRF_GPIO2

5V0 5V0

3V3

0R25

0R18

100nF

0R21

R8 0

0R11

0R16

0R22

0R19

0R9

0R14

0R26

0R28

CN2

1 2

3 4

Header 20X2_female

5 6

7 8

9 10

11 12

13 14

15 16

17 18

19 20

21 22

23 24

25 26

27 28

29 30

31 32

35 36

37 38

39 40

0R17

0R24

0R12

0R15

100nF

0R20

0R23

0R27

0R10

100nF

0R13

SDA

SCL

#11

#13

#15 #16

#18

MOSI

MISO #22

SCLK CE0

ID_SD ID_SC

#33

SDA #32

SCL #16

#7 #18

#11 #22

#13 CE0

#15 ID_SC

MOSI

MISO

SCLK

ID_SD

#33

#29

#31

#31 #32

#10

Table 6. Configuration of the GPIO connector pins

Pin no. Name STM32MP157F-DK2 Pin no. Name STM32MP157F-DK2

1 3V3 2 5V0

3 LSM6DSOX_SDA PA12/I2C5_SDA 4 5V0

5 LSM6DSOX_SCL PA11/I2C5_SCL 6 GND

7 LSM6DSOX_INT1 PA8/MCO1 8 SPSGRF_GPIO3 PB10/USART3_TX

9 GND GND 10 SPSGRF_GPIO2 PB12/USART3_RX

11 LSM6DSOX_INT2 PG8/USART3_RTS 12 #12 PI5/SAI2_SCKA

13 SWITCH_1 PD7/SDMMC3_D3 14 GND

15 SWITCH_2 PG15/SDMMC3_CK 16 SPSGRF_GPIO0 PF1/SDMMC3_CMD

17 3V3 18 SPSGRF_GPIO1 PF0/SDMMC3_D0

19 SPSGRF_MOSI PF9/SPI5_MOSI 20 GND

21 SPSGRF_MISO PF8/SPI5_MISO 22 LED1 PF4/SDMMC3_D1

23 SPSGRF_SCLK PF7/SPI5_SCK 24 SPSGRF_CS PF6/SPI5_NSS

25 GND 26 CE1 PF3/GPIO7

27 EEPROM_ID_SD PF15/I2C1_SDA 28 EEPROM_ID_SC PD12/I2C1_SCL

29 SPSGRF_SDN PG2/MCO2 30 GND

31 LED_RGB_GREEN PH11/TIM5_CH2 32 LED_RGB_RED PD13/TIM4_CH2

33 LED_RGB_BLUE PC7/TIM3_CH2 34 GND

UM3039

GPIO connector

UM3039 - Rev 1 page 6/23

Pin no. Name STM32MP157F-DK2 Pin no. Name STM32MP157F-DK2

35 #35 PI7/SAI2_FSA 36 #36 PB13/USART3_CTS

37 #37 PF5/SDMMC3_D2 38 #38 PI6/SAI2_SDA

39 GND 40 #40 PF11/SAI2_SDB

2.3 iNEMO inertial module (LSM6DSOX)

The embedded features LSM6DSOX iNEMO inertial module. It has a full-scale acceleration range of ±2/±4/±8/±16

g and an angular rate range of ±125/±250/±500/±1000/±2000 dps.

Figure 5. LSM6DSOX circuit

LSM6DSOX_SDA

LSM6DSOX_SCL

LSM6DSOX_INT1

LSM6DSOX_INT2

3V3

LSM6DSOXTR

OCS_Aux

1SDO/SA0

5VDDIO

4INT1

SCx

3SDx

CS 12

INT2

7GND2

VDD

6GND1

SDO_Aux

SCL 13

SDA 14

100nF

0R29

R31

3.9K

100nF

R32

3.9K

R30

R33

4.7K

LSM6DSOX_SDA

LSM6DSOX_SCL

LSM6DSOX_3V3

LSM6DSOX_3V3 LSM6DSOX_3V3

LSM6DSOX_3V3

2.4 SPSGRF module

The embedded SPSGRF-915 module is based on the SPIRIT1 low data rate, low-power sub-GHz transceiver.

Figure 6. SPSGRF-915 circuit

SPSGRF_MISO

SPSGRF_MOSI

SPSGRF_CS

SPSGRF_SCLK

SPSGRF_GPIO1

SPSGRF_GPIO0

SPSGRF_GPIO3

SPSGRF_GPIO2

3V3

SPSGRF_SDN

SPSGRF-915

1GPIO3

2GPIO2

3GPIO1

4GPIO0

Vin

SPI_CS

6GND

SPI_CLK

SPI_MISO

SPI_MOSI

SDN 11

0R34

100nF

2.5 RGB LED

The X-STM32MP-IOT01A includes an RGB LED (SML-LX0404SIUPGUSB).

UM3039

iNEMO inertial module (LSM6DSOX)

UM3039 - Rev 1 page 7/23

Figure 7. SML-LX0404SIUPGUSB circuit

UM3039

RGB LED

UM3039 - Rev 1 page 8/23

3Getting started

3.1 System requirements

• An X-STM32MP-IOT01A expansion board

•An STM32MP157F-DK2 discovery kit

• A NUCLEO-F401RE development board

• An X-NUCLEO-IDS01A5 expansion board

• A 3.3 V DC power supply

• A USB Type-C™ cable

• Two mini-USB ports

• A programming cable (compatible with ST-LINK)

• A LAN cable to connect with the internet router, to keep the STM32MP157F-DK2 and the Linux PC on the

same network

• A Linux PC with a USB port

3.2 System setup

Step 1. Check that the jumper on the X-STM32MP-IOT01A J4 connector is connected.

This jumper enables the write operation for the EEPROM.

Step 2. Connect the X-STM32MP-IOT01A to the STM32MP157F-DK2 from the top.

Figure 8. X-STM32MP-IOT01A expansion board on top of the STM32MP157F-DK2

Step 3. Power the STM32MP157F-DK2 via the USB Type-C™ cable.

Step 4. Program the supported firmware in the STM32MP157F-DK2.

The system is ready for use.

UM3039

Getting started

UM3039 - Rev 1 page 9/23

4Schematic diagrams

Figure 9. X-STM32MP-IOT01A schematic diagram (1 of 6)

EEPROM

EEPROM_ID_SD

EEPROM_ID_SC

GPIO_Expansion_Connector

LSM6DSOX_SCL

EEPROM_ID_SC

SPSGRF_MOSI

SPSGRF_SCLK

SPSGRF_GPIO1

SPSGRF_GPIO0

EEPROM_ID_SD

SPSGRF_MISO

SWITCH_2

SWITCH_1

LSM6DSOX_SDA

SPSGRF_GPIO2

SPSGRF_GPIO3

LSM6DSOX_INT1

LSM6DSOX_INT2

SPSGRF_SDN

SPSGRF_CS

LED1

LED_RGB_BLUE

LED_RGB_RED

LED_RGB_GREEN

Accelerometer & Gyroscope

LSM6DSOX_SDA

LSM6DSOX_SCL

LSM6DSOX_INT1

LSM6DSOX_INT2

SPSGRF-915

SPSGRF_MISO

SPSGRF_MOSI

SPSGRF_SCLK

SPSGRF_GPIO1

SPSGRF_GPIO0

SPSGRF_GPIO3

SPSGRF_GPIO2

SPSGRF_SDN

SPSGRF_CS

LEDs & Switches

SWITCH_1

SWITCH_2

LED1

LED_RGB_BLUE

LED_RGB_RED

LED_RGB_GREEN

UM3039 - Rev 1 page 10/23

UM3039

Schematic diagrams

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