DIGI ConnectCore MP15 Development Board Instruction Manual

: June 9, 2024
: DIGI

Connect Core MP15
Development Board
Hardware Reference Manual

Connect Core MP15 Development Board

Revision history—90002511

Revision	Date	Description
1P	Dec-22	Initial draft.

Trademarks and copyright
Digi, Digi International, and the Digi logo are trademarks or registered trademarks in the United States and other countries worldwide. All other trademarks mentioned in this document are the property of their respective owners.
© 2022 Digi International Inc. All rights reserved.

Disclaimers
Information in this document is subject to change without notice and does not represent a commitment on the part of Digi International. Digi provides this document “as is,” without warranty of any kind, expressed or implied, including, but not limited to, the implied warranties of fitness or merchantability for a particular purpose. Digi may make improvements and/or changes in this manual or in the product(s) and/or the program(s) described in this manual at any time.

Warranty
To view product warranty information, go to the following website: www.digi.com/howtobuy/terms

Customer support
Gather support information: Before contacting Digi technical support for help, gather the following information:

Product name and model
Product serial number (s)
Firmware version
Operating system/browser (if applicable)
Logs (from time of reported issue)
Trace (if possible)
Description of issue
Steps to reproduce

Contact Digi technical support: Digi offers multiple technical support plans and service packages.
Contact us at +1 952.912.3444 or visit us at www.digi.com/support.

Feedback
To provide feedback on this document, email your comments to techcomm@digi.com
Include the document title and part number (Connect Core MP15 Development Board, 90002511 1P) in the subject line of your email.

About the Connect Core MP15

The Digi Connect Core® MP15 development kit and System-on-Module (SOM) platform is a highly integrated, cost-effective, connected, secure embedded solution, built on the STM32MP15x MPU family. It integrates memory, power management, the Digi Microcontroller Assist™, pre-certified wireless connectivity and advanced Digi Trust Fence device security with a complete, open-source Linux software platform based on the Yocto Project.
Note While the Connect Core MP15 system-on-module is designed to be used in a production environment, the Connect Core MP15 Development Kit is designed only for development and testing in a pre-production environment.

Features and functionality

ConnectCore MP15 module
- STM32MP157C dual ARM Cortex-A7 and single Cortex-M4 cores operating at speeds up to 800MHz
- Up to 1 GB, 16-bit DDR3 memory
- Up to 1 GB, 8-bit SLC NAND flash memory
- IEEE 802.11 a/b/g/n/ac WLAN and Bluetooth 5.0
Power
- Power jack or industrial-dedicated 5V power connector
- Coin-cell battery charger, supplying the on-module RTC
- Power and reset buttons
Boot source configuration
- NAND, USB, microSD
Debug
- Standard IEEE 1149.1 JTAG interface
- Serial console at AB-type micro-USB connector and TTL level n Multimedia
- MIPI DSI display
- HDMI display (through MIPI-to-HDMI transceiver)
- Parallel 24-bit LCD interface with FFC on-board connector
- LVDS interface with up to four differential data pairs (through parallel-to-LVDS transceiver)
- 8-bit parallel camera
- Audio CODEC with the following functionality
  o One 3.5 mm headphone jack
  o One 3.5 mm microphone jack
  o Two speaker outputs
  o One line-out output
  o Two line-in inputs
Storage
- NAND flash
- microSD card slot
Communication
- RS-232
- RS-485
- Two CAN
- Gigabit Ethernet
- Two USB Host 2.0 interfaces through a stacked USB A type connector
- USB OTG with AB-bye micro-USB connector
- SISO IEEE 802.11 a/b/g/n/ac + Bluetooth 5.0 with on-module U.FL or external SMA antenna connector
- PCI Express Mini Card slot supporting full and half-size cards
- Mikro Bus socket
- XBee socket supporting XBee Cellular
User interface
- Three user LED, two of them shared with user buttons
Dimensions:
- 120 x 160 mm

Safety instructions

The ConnectCore MP15 development board development board cannot be guaranteed operation due to the radio link and so should not be used for interlocks in safety critical devices such as machines or automotive applications.
The ConnectCore MP15 development board development board has not been approved for use in (this list is not exhaustive):
- nuclear applications
- explosive or flammable atmospheres
There are no user serviceable components inside the ConnectCore MP15 development board development board. Do not modify the Connect Core MP15 development board in any way. Modifications may exclude the development board from any warranty and can cause the
Connect Core MP15 development board to operate outside of regulatory compliance for a given country, leading to the possible illegal operation of the radio.
Use industry standard ESD protection when handling the ConnectCore MP15 development board development board.
Take care while handling to avoid electrical damage to the PCB and components.
Do not expose Connect Core MP15 development board development board to water or moisture.
Use this product with the antennas specified in the ConnectCore MP15 development board development board user guides.

Block diagram

Placement

Top view

Bottom view

Note Serigraphy on the bottom side of the PCB is incorrect. Refer to schematics and CAD documentation for correct identification of the connectors.

Connectors

The following table lists all connectors on the Connect Core MP15 development board:

Connector	Interface
J1	WLAN/Bluetooth expansion
J2	upfill
J3	Bluetooth UART
J4	upfill
J5	SMA
J6	5V power-in jack
J7	5V power in
J8	VCC_MCA series jumper
J9	Supercar series jumper
J10	Coin cell
J11	Mini PCIe
J12	Micro SIM
J13	microSD
J14	USB Console
J15	RS232/RS485 TX line selector jumper
J16	RS232/RS485 RX line selector jumper
J17	RS232/RS485 RTS line selector jumper
J18	RS485 termination resistor jumper
J19	RS485
J20	TTL Console
J21	STM32MP15 JTAG
J22	MCA SWD
J23	10/100/1000 MPs RJ-45
J24	Dual USB A-type
J25	USB OTG
J26	Parallel display
J27	LVDS display
J28	Microphone jack
J29	Headphone jack
J30-J31	Micro Bus socket
J32	CAN1 termination resistor jumper
J33	CAN1
J34	CAN2 termination resistor jumper
J35	CAN2
J36-J37	XBee socket
J38	UART/RS232 expansion
J39	Audio expansion
J40	USB expansion
J41	GPIO expansion
J42	SPI/I2C expansion
J44	MIPI display
J45	HDMI
P1	Parallel camera
S1	Boot switches
SW1	Power button
SW2	Reset button
SW3	User button
SW4	User button
SW5	User button
CAD1	STM32MP1 JTAG Tag Connect
CAD2	MCA SWD Tag Connect

Interfaces

The following interfaces are available on the ConnectCore MP15 development board:

Power interfaces

This section describes the Connect Core MP15 development board power interfaces.

DC-in jack connector
The input voltage of the Connect Core MP1 Development Board is 5V. This input power supply can be provided from two different connectors:

DC-in power jack.
J7, a 2-pin, 2.54 mm pitch connector:

Pin	Signal name	Description
1	VIN	5V power supply
2	GND

Note Digi recommends not powering both connectors at the same time.
An overvoltage circuit protects the board from overvoltage and overcurrent events. Downstream from these input power protections, there are two regulators/switches for powering the carrier board circuitry:

5V Load switch (U6): A 5V load switch that controls the power delivery to different interfaces on the carrier board.
PCIe regulator (U7): A dedicated adjustable regulator for the PC I.e. socket.

Coin cell connector
Connector J10 on the board is included for attaching an external coin-cell to the system:

Pin	Signal name	Description
1	VCC_LICELL	Power supply for RTC
2	GND

Power and reset buttons
One power button (SW1) and one reset button (SW2) are included on the development board.

System boot

The Connect Core MP1 module supports different boot modes (see the Connect Core MP1 System-on Module Hardware Reference Manual for detailed information). The development board supports these boot modes, although some of them require changes to the populated components. A quadruple switch (S1) allows swapping between eight different boot modes:

S1.1	S1.2	S1.3	Boot mode
Open	Open	Open	On-module NAND
Open	Open	Close	Serial NAND flash
Open	Close	Open	Serial NOR flash
Open	Close	Close	MicroSD card
Close	Open	Open	eMMC
Close	Open	Close	UART and USB Port 2
Close	Close	Open	UART and USB Port 1
Close	Close	Close	Reserved

Debug interfaces

JTAG
The ConnectCore MP15 Development Board provides a Tag Connect footprint for accessing the STM32MP1 JTAG debug port. Additionally, a standard 10-pin, 1.27mm pitch connector (J21) is available for accessing the JTAG interface:

Pin	Signal name	Description
1	VDD	3.3V Power supply
2	JTMS-SWDIO	Mode select line
3	GND
4	JTCK-SWCLK	Clock line
5	GND
6	JTDO-TRACESWO	Data output line
7	NC
8	JTDI	Data inputs line
9	GND
10	NRST	Reset line of the CPU

Console port
A dedicated USB micro AB-type port (J14) provides access to the console port of the ConnectCore MP1 system-on-module. This USB port is routed directly to the CY7C65211 bridge, which converts the USB bus into TTL level. UART4 is used as the console debug port of the STM32MP1 CPU. This UART can also be accessed directly at TTL level through J20 connector:

Pin	Signal name	Description
1	UART4_TX	UART transmission line
2	UART4_RX	UART receiver line
3	VDD	3.3V Power supply
4	GND

Default console port settings:

Baud rate: 115200
Data: 8 bit
Parity: none
Stop: 1 bit
Flow control: none

Multimedia

Parallel/LVDS display
The ConnectCore MP15 provides a 24-bit RGB LCD interface available through a 40-pin, 0.5 mm pitch, FFC connector. Backlight control signal, I2C port, and interrupt line for the touch screen panel are available on the LCD connector.
The following table shows the pinout of the parallel display connector (J26):

Pin	Signal name	Description
1	GND
2	LTDC_B2	Blue 2 data line
3	LTDC_B3	Blue 3 data line
4	LTDC_B4	Blue 4 data line
5	LTDC_B5	Blue 5 data line
6	LTDC_B6	Blue 6 data line
7	LTDC_B7	Blue 7 data line
8	LTDC_G2	Green 2 data line
9	LTDC_G3	Green 3 data line
10	LTDC_G4	Green 4 data line
11	LTDC_G5	Green 5 data line
12	LTDC_G6	Green 6 data line
13	LTDC_G7	Green 7 data line
14	LTDC_R2	Red 2 data line
15	LTDC_R3	Red 3 data line
16	LTDC_R4	Red 4 data line
17	LTDC_R5	Red 5 data line
18	LTDC_R6	Red 6 data line
19	LTDC_R7	Red 7 data line
20	LTDC_B0	Blue 0 data line
21	LTDC_B1	Blue 1 data line
22	LTDC_G0	Green 0 data line
23	LTDC_G1	Green 1 data line
24	LTDC_R0	Red 0 data line
25	LTDC_R1	Red 1 data line
26	GND
27	LTDC_CLK	Display clock line
28	GND
29	LTDC__HSYNC	Horizontal sync line
30	LTDC__VSYNC	Vertical sync line
31	LTDC_DE
32	LTDC__RESET
33	LTDC_I2C_SCL	STM32MP1 I2C2 bus clock line
34	LTDC_I2C_SDA	STM32MP1 I2C2 bus data line
35	LTDC_IRQ_N	Interrupt line
36	GND
37	BCKL_PWM	Backlight PWM
38	3V3	3.3V power supply
39	5V_DISPLAY	5V power supply
40	5V_DISPLAY	5V power supply

This same parallel display bus is connected to a parallel-to-LVDS transceiver, allowing support for LVDS displays through a 20-pin, 1.25 mm pitch connector (J27). This means that parallel and LVDS connectors cannot be used simultaneously.
This LVDS connector also provides backlight control signal, I2C port, and an interrupt line for the touch screen panel:

Pin	Signal name	Description
1	3V3	3.3V power supply
2	LVDS0_TX0_N	Transmission pair data line 0 (-)
3	LVDS0_TX0_P	Transmission pair data line0 (+)
4	GND
5	LVDS0_TX1_N	Transmission pair data line 1 (-)
6	LVDS0_TX1_P	Transmission pair data line 1 (+)
7	GND
8	LVDS0_TX2_N	Transmission pair data line 2 (-)
9	LVDS0_TX2_P	Transmission pair data line 2 (+)
10	GND
11	LVDS0_CLK_N	Transmission pair clock line (-)
12	LVDS0_CLK_P	Transmission pair clock line (+)
13	GND
14	LVDS0_TX3_N	Transmission pair data line 3 (-)
15	LVDS0_TX3_P	Transmission pair data line 3 (+)
16	BCKL_PWM	Backlight PWM
17	LTDC_I2C_SCL	STM32MP1 I2C2 bus clock line
18	LTDC_I2C_SDA	STM32MP1 I2C2 bus data line
19	LCD_IRQ_N	Interrupt line
20	5V_DISPLAY	5V power supply

MIPI/HDMI display
The ConnectCore MP1 system-on-module supports only one MIPI-DSI display interface. On the development board, this MIPI-DSI display is managed so that two different display interfaces are supported, although only one of them can work at a time:

HDMI: The Lontium LT8912B bridge is populated on the development board to adapt the MIPIDSI interface to HDMI. This HDMI interface is available over a standard HDMI connector.
MIPI-DSI: the native MIPI-DSI interface of the SOM is available over a 20-pin connector (J44):

Pin	Signal name	Description
1	DSI_DA0_P	Data pair 0 (+) line
2	DSI_DA0_N	Data pair 0 (-) line
3	GND
4	DSI_DA1_P	Data pair 1 (+) line
5	DSI_DA1_N	Data pair 1 (-) line
6	GND
7	NC
8	NC
9	GND
10	NC
11	NC
12	GND
13	DSI_CKA_P	Clock pair (+) line
14	DSI_CKA_N	Clock pair (-) line
15	GND
16	LTDC_I2C_SCL	STM32MP1 I2C2 bus clock line
17	LTDC_I2C_SDA	STM32MP1 I2C2 bus data line
18	BCKL_PWM	Backlight PWM
19	GND
20	3V3	3.3 V power supply

Parallel camera
The Connect Core MP15 Development Board provides a parallel camera sensor interface (CSI), available over a 30-pin, 0.5 mm pitch FFC connector (P1):

Pin	Signal name	Description
1	GND
2	NC
3	NC
4	DCMI_D0	Camera data line 0
5	DCMI_D1	Camera data line 1
6	DCMI_D2	Camera data line 2
7	DCMI_D3	Camera data line 3
8	DCMI_D4	Camera data line 4
9	DCMI_D5	Camera data line 5
10	DCMI_D6/FDCAN1/2_RX	Camera data line 6
11	DCMI_D7/FDCAN1/2_TX	Camera data line 7
12	NC
13	NC
14	GND
15	DCMI_PIXCLK	Camera pixel clock line
16	GND
17	DCMI_HSYNC	Camera horizontal sync
18	5V	5V power supply
19	DCMI_VSYNC	Camera vertical sync
20	3V3	3.3V power supply
21	CAMERA_CLK	Camera master clock line
22	NC
23	GND
24	NC
25	CAM_GPIO	Camera dedicated GPIO
26	CAM_PWDN	Camera power down line
27	DCMI_I2C_SDA	STM32MP1 I2C2 bus dataline
28	DCMI_I2C_SCL	STM32MP1 I2C2 bus clock line
29	GND
30	3V3	3.3 V power supply

Audio
The Maxim MAX98089 audio codec manages the audio interface on the development board. The board provides the following audio functionality:

3.5 mm headphone jack
3.5 mm microphone jack
x2 speaker outputs (left and right)
x1 line-out output
x2 line-in inputs

The speakers, line-out signals and line-in signals are available over a 10-pin connector (J39):

Pin	Signal name	Description
1	LINE1_IN_R	Single-ended line input A1
2	LINE1_IN_L	Single-ended line input A2
3	LINE2_IN_R	Single-ended line input B1
4	LINE2_IN_L	Single-ended line input B2
5	LINE_OUT_R	Right line output
6	LINE_OUT_L	Left line output
7	SPKL_P	Positive left-channel class D speaker output
8	SPKL_N	Negative left-channel class D speaker output
9	SPKR_P	Positiveright-channel class D speaker output
10	SPKR_N	Negative right-channel class D speaker output

Storage interface

MicroSD
A microSD socket connected to the SDMMC2 port of the STM32MP1 CPU is available on the Connect Core MP15 development board.

Communication

Gigabit Ethernet
10Base-T/100Base-Tx/1000Base-T Ethernet interface is fully integrated in the board through the Analog Devices ADIN1300 Ethernet PHY. The Ethernet interface is accessible through a RJ-45 connector with integrated link/activity LEDs.

UART/RS-232/RS-485
RS-232 and RS-485 standards are supported on the Connect Core MP15 Development Board, by sharing one CPU UART port (UART7). This means that only one of the two protocols can be use at a time. Selection between both is done through three three-position headers (J15, J16 and J17). RS-232 port is available in connector J38, where USART3 is also connected:

Pin	Signal name	Description
1	USART3/8_TX	UART3 transmission line
2	RS232_7_TX	RS232 transmission line
3	USART3/8_RX	UART3 receiver line
4	RS232_7_RX	RS232 receiver line
5	USART3/8_RTS	UART3 RTS line (output)
6	RS232_7_RTS_N	RS232 RTS line (output)
7	USART3/8_CTS	UART3 CTS line (input)
8	RS232_7_CTS_N	RS232 CTS line (input)
9	GND
10	3V3	3.3 V power supply

Note USART3 interface is shared with XBee socket and CAN.

RS-485 is on J19:

Pin	Signal name	Description
1	3V3	3.3 V power supply
2	RS485_B	RS485 B line
3	RS485_A	RS485 A line
4	GND

CAN
Two CAN FD buses are available on the development board through connectors J33 (CAN1) and J35 (CAN2). The pinout of these connectors is as follows, where x refers to the CAN interface on each connector:

Pin	Signal name	Description
1	5V	5V power supply
2	CANx_H	CAN high line
3	CANx_H	CAN low line
4	GND

You can connect 120Ω terminator resistors to each port by closing J32 (CAN1) and J34 (CAN2).

Note The CAN1 interface is shared with parallel camera and CAN2 interface is shared with XBee socket USART3.

USB Host
The ConnectCore MP15 Development Board offers support for four USB Host interfaces. Two of them are available over a stackable dual USB A-type connector. The third USB Host is connected to the PCI Express Mini card connector. The fourth is connected to the XBee socket as well as to a a 6-pin, 1.25 mm pitch expansion connector (J40). All USB Hosts can operate at full, high, and low speed. The following table shows the pinout of the USB expansion connector:

Pin	Signal name	Description
1	VIN_PROT	5V power supply
2	USBH4_D_P	USB 4 differential data signal (+)
3	USBH4_D_N	USB 4 differential data signal (-)
4	USBH4_OC_N	Over current input
5	USBH4_PWR_EN	Power enable output
6	GND

USB OTG
A micro-AB type receptacle for USB OTG connection is available on the Connect Core MP15 Development Board. This interface can operate in both Host and Device mode.
High-speed, full-speed, and low-speed connections are supported in Host mode. High-speed and full speed connections are supported in Device mode.

Mini PCI Express slot
The Connect Core MP15 Development Board provides a Mini PCI Express socket supporting USB and I2C connection to the CCMP15 module. A micro SIM socket is also connected to the Mini PCI Express slot.

XBee socket
One XBee socket is populated on the development board, supporting XBee Cellular modules. The UART bus connected to the XBee socket (USART3) is shared with CAN2.

Mikro Bus socket
The Connect Core MP1 Development Board provides a socket compatible with Mikro Electronica Micro Bus click boards, supporting I2C, UART, SPI, ADC and PWM connectivity.

SPI and I2C
A expansion connector provides access to one SPI interface (shared with the Mikro Bus socket) and the I2C2 bus:

Pin	Signal name	Description
1	SPI4_SCK	SPI clock line
2	3V3	3.3V Power supply
3	SPI4_MISO	SPI MISO line
4	EXP_I2C_SCL	STM32MP1 I2C2 bus clock line
5	SPI4_MOSI	SPI MOSI line
6	EXP_I2C_SDA	STM32MP1 I2C2 bus data line
7	SPI4_NSS	SPI slave select line
8	NC
9	SPI1_IRQ_N	Interrupt line/GPIO
10	GND

GPIO
An additional expansion connector provides access to different IOs for general purpose usage:

Pin	Signal name	Description
1	VCC_MCA	MCA power supply
2	VREF+	STM32MP1 internal ADC/DAC reference voltage
3	MCA_IO0/MIK_ADC	MCA IO
4	ANA0	STM32MP1 ADC
5	MCA_IO2/EXT_VREF	MCA IO
6	ANA1	STM32MP1 ADC
7	MCA_IO4	MCA IO
8	GND
9	MCA_IO5	MCA IO
10	NU	Not used on MP15
11	MCA_IO6/CLKOUT32K	MCA IO and 32 kHz output clock
12	NU	Not used on MP15
13	MP15_PF15	STM32MP1 IO
14	NU	Not used on MP15
15	NU	Not used on MP15
16	NU	Not used on MP15
17	NU	Not used on MP15
18	NU	Not used on MP15
19	NU	Not used on MP15
20	NU	Not used on MP15

User interfaces

Three LEDs are available on the development board, all of them are connected to CPU GPIOs. Two of them are shared with user buttons

Wireless

There is a u.FL connector (J4) which is routed directly to a SMA connector (J5). The purpose is to addapt the u.FL form factor to SMA form factor in order to extend the number of antennas that can be used on the development board for either the on-module antenna path or any other RF path that could be used on a PCIe or XBee board.

Specifications

Electrical specification

Supply voltages
The Connect Core MP15 Development Board has three supply inputs. Two of them power the whole system (Connect Core MP15 Development Board plus the Connect Core MP15 system-on-module) and the other one powers the RTC of the module when the main supply is not present. The following table shows the voltage range of the input supplies of the Connect Core MP15 Development Board:

Signal	Description	Min	Typ	Max	Unit
VIN (jack connector)	Power jack input	4.6	5.0	5.5	V
VIN (additional connector)	Additional connector input	4.6	5.0	5.5	V
VCC_LICELL	Supply for RTC	1.1		5.5	V

Power consumption

The power consumption of the entire board (the ConnectCore MP15 Development Board plus the ConnectCore MP15 module) has been measured directly through the 5V input power supply. The following table lists power consumption figures measured in the ConnectCore MP15 Development Board under specific use cases.

Development board power consumption (VIN)

Suspend
mode| Power-off mode| Run-time
IDLE| Display connected
(IDLE)| Decoding
video| CPU
stress
40 mW| 2 mW| 0.84 W| 2.85 W| 3.10 W| 1.375 W

Note To better understand the power consumption of the system, refer to the Connect Core MP1 System-on-Module Hardware Reference Manual to see the power consumption of the module (isolated) under the same use cases.

Use case descriptions
This section describes the use cases that were used to measure power consumption of the ConnectCore MP15 Development Board.

Suspend
System in suspend to RAM mode.

CAUTION! You can achieve minimum power consumption numbers by disabling both 3.3V power domains. However, in some applications it may not be possible to switch them off, depending on what they are powering.

Power-off
System in power-off with RTC enabled.

IDLE
System up and running. Ethernet and wireless disabled.

Decoding video
System up and running with the following configuration:

Ethernet and wireless disabled.
Fusion7 parallel display connected to the system.

Includes two different use cases:

Display connected in IDLE mode (without decoding video).
CPU decoding video.

CPU stress
System up and running with the following configuration:

One Ethernet interface up and linked. The other one disabled.
USB connected to the system.
Hanoi application running (Hanoi application stresses the CPU and put it at 100% work load).

Mechanical specification

The ConnectCore MP15 Development Board dimensions are 120 x 160 mm. Four 3.2mm drills are located on the four corners of the PCB for assembling the board into an enclosure. These drills have a 5.5mm round metalized area for the screws and nuts. The board has four 2.6mm drills to assembly a half size or a full size PCI express mini card module, with 5.8mm x 5.8mm square metalized area for the screws and nuts.

Environmental specification

Specification	Operating temperature
Industrial	-40° C to +85° C

WLAN specification

For a complete WLAN specification, refer to the Connect Core MP1 System-on- Module Hardware
Reference Manual.

Connect Core MP15 Development Board

Documents / Resources

| DIGI ConnectCore MP15 Development Board [pdf] Instruction Manual
ConnectCore MP15, ConnectCore MP15 Development Board, Development Board, Board
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