ST UM3039 User manual

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.
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Safety precautions
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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
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Overview
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•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
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EEPROM (M24C32-RMN6TP)
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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.
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GPIO connector
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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
C4
100nF
0R21
R8 0
0R11
0R16
0R22
0R19
0R9
0R14
0R26
0R28
CN2
33
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
34
35 36
37 38
39 40
0R17
0R24
0R12
0R15
C5
100nF
C2
100nF
0R20
0R23
0R27
0R10
C3
100nF
0R13
SDA
SCL
#7
#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
#29
#31
#31 #32
#8
#10
#8
#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
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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
U2
LSM6DSOXTR
10
OCS_Aux
1SDO/SA0
5VDDIO
4INT1
SCx
3SDx
2
CS 12
9
INT2
7GND2
8
VDD
6GND1
11
SDO_Aux
SCL 13
SDA 14
C6
100nF
0R29
R31
3.9K
C7
100nF
R32
3.9K
R30
1K
R33
4.7K
LSM6DSOX_SDA LSM6DSOX_SCL
LSM6DSOX_3V3
LSM6DSOX_3V3
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
U3
SPSGRF-915
1GPIO3
2GPIO2
3GPIO1
4GPIO0
Vin
5
10
SPI_CS
6GND
7
SPI_CLK
8
SPI_MISO
9
SPI_MOSI
SDN 11
0R34
C8
100nF
2.5 RGB LED
The X-STM32MP-IOT01A includes an RGB LED (SML-LX0404SIUPGUSB).
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iNEMO inertial module (LSM6DSOX)
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Figure 7. SML-LX0404SIUPGUSB circuit
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RGB LED
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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.
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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
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UM3039
Schematic diagrams